Violent EF-5 Tornado Causes Catastrophic Damage in Moore, Oklahoma

By: Dr. Jeff Masters , 4:00 PM GMT on May 21, 2013

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A massive and violent tornado 1.3 miles wide smashed through Moore, Oklahoma near 3 pm CDT Monday, causing catastrophic damage along a 17-mile long path. The National Weather Service in Norman, Oklahoma announced that it has found at least one area of EF-5 damage near Briarwood Elementary School, with winds of 200 - 210 mph. Damage was extreme and covered a huge area, and many buildings swept away down to their foundations. The tornado was on the ground for 51 minutes, from 2:45 - 3:36 pm CDT. This averages out to a 20 mph forward speed, and the tornado was initially moving even slower--20 mph. Violent tornadoes typically move considerably faster, sometimes at speeds in excess of 60 mph, and the relatively slow motion of the Moore tornado contributed to the extreme damage by exposing buildings to a longer period of violent winds than usual. A tornado warning for the storm was issued at 2:40 pm CDT, sixteen minutes before it touched down. On average, a tornado warning comes about thirteen minutes before touchdown. A tornado emergency was declared for Moore at 3:01 pm, about twenty minutes before the tornado entered the west side of the city. The debris ball from the tornado, as seen on Doppler radar, expanded to over two miles in diameter, and debris was carried over 100 miles from Moore. The National Weather Service office in Tulsa, Oklahoma reported at 4:13 pm CDT that they were "seeing reports of light tornado debris falling in the Tulsa metro area again this evening, likely from the Moore area." Tulsa is 100 miles east-northeast of Moore.


Figure 1. The Moore, Oklahoma tornado of May 20, 2013. Image credit: WIkipedia.


Figure 2. A fire burns in the Tower Plaza Addition in Moore, Oklahoma, following a tornado on Monday, May 20, 2013. Photo: Sue Ogrocki, ASSOCIATED PRESS.


Figure 3. Flipped vehicles are piled up outside the heavily damaged Moore Medical Center in Moore, Oklahoma, after a powerful tornado ripped through the area on May 20, 2013. On the enhanced Fujita Scale, the maximum degree of damage (11), indicating EF-5 winds of 210 mph, is "Significant damage to building envelope" on an institutional building like a hospital or government office. The damage to the Moore Medical Center may qualify as EF-5 damage. Image credit: Brett Deering/Getty Images)

Here is the tornado warning that was issued at 2:40 pm CDT, sixteen minutes before the tornado touched down:

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NORMAN OK
240 PM CDT MON MAY 20 2013

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* TORNADO WARNING FOR...
NORTHWESTERN MCCLAIN COUNTY IN CENTRAL OKLAHOMA...
SOUTHERN OKLAHOMA COUNTY IN CENTRAL OKLAHOMA...
NORTHEASTERN GRADY COUNTY IN CENTRAL OKLAHOMA...
NORTHERN CLEVELAND COUNTY IN CENTRAL OKLAHOMA...

* UNTIL 315 PM CDT

* AT 238 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED NEAR NEWCASTLE...AND MOVING EAST AT 20 MPH.

IN ADDITION TO A TORNADO...LARGE DAMAGING HAIL UP TO GOLF BALL SIZE IS EXPECTED WITH THIS STORM.

* LOCATIONS IMPACTED INCLUDE...NORMAN...MOORE...NEWCASTLE...BRIDGE CREEK AND VALLEY BROOK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW IN A STORM SHELTER OR AN INTERIOR ROOM OF A STURDY BUILDING. STAY AWAY FROM DOORS AND WINDOWS.


At 3:01 pm CDT, five minutes after the tornado touched down and about twenty minutes before the tornado hit the west side of Moore, the NWS issued a "Tornado Emergency" advisory:


BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NORMAN OK
301 PM CDT MON MAY 20 2013

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* TORNADO WARNING FOR...
NORTHWESTERN MCCLAIN COUNTY IN CENTRAL OKLAHOMA...
SOUTHERN OKLAHOMA COUNTY IN CENTRAL OKLAHOMA...
NORTHERN CLEVELAND COUNTY IN CENTRAL OKLAHOMA...

* UNTIL 345 PM CDT

* AT 259 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS AND STORM SPOTTERS WERE TRACKING A LARGE AND EXTREMELY DANGEROUS TORNADO NEAR NEWCASTLE. DOPPLER RADAR SHOWED THIS TORNADO MOVING NORTHEAST AT 20 MPH.

THIS IS A TORNADO EMERGENCY FOR MOORE AND SOUTH OKLAHOMA CITY.

IN ADDITION TO A TORNADO...LARGE DESTRUCTIVE HAIL UP TO TENNIS BALL SIZE IS EXPECTED WITH THIS STORM.

* LOCATIONS IMPACTED INCLUDE...MIDWEST CITY...MOORE...NEWCASTLE...STANLEY DRAPER LAKE...TINKER AIR FORCE BASE AND VALLEY BROOK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS AN EXTREMELY DANGEROUS AND LIFE THREATENING SITUATION. IF YOU CANNOT GET UNDERGROUND GO TO A STORM SHELTER OR AN INTERIOR ROOM OF A STURDY BUILDING NOW.

TAKE COVER NOW IN A STORM SHELTER OR AN INTERIOR ROOM OF A STURDY BUILDING. STAY AWAY FROM DOORS AND WINDOWS.


Figure 4. The annual number of EF-3 and stronger tornadoes, 1954 - 2012. The greatest number of these dangerous tornadoes was 131 in 1974, the year of the notorious "Super Outbreak." The minimum was just 15, set in 1987. The average is 43 per year. Image credit: NOAA.


Figure 5. Violent EF-4 and EF-5 tornadoes make up only 1% of all tornadoes, but account for well over half of all deaths. Image credit: tornadoproject.com.

A very bad tornado in an otherwise quiet year for violent tornadoes
According to NOAA, the U.S. has averaged 43 EF-3 or stronger tornadoes per year during the period 1954 - 2012. With tornado season nearly half over, we are well below the average pace for these most dangerous tornadoes--only nine EF-3 and EF-4 tornadoes have been recorded so far in 2013. An average year should have had at least fifteen of these tornadoes by this point in the year. Here are the nine EF-3 and stronger tornadoes so far in 2013:

EF-5, 200 - 210 mph winds, May 20, Moore, Oklahoma. Many deaths and injuries.
EF-4, 166 - 200 mph winds, May 19, Shawnee, Oklahoma. 2 deaths.
EF-4, 180 mph winds, May 15, Granbury, TX. 6 deaths, 24+ injuries.
EF-4, 165 - 185 mph winds, May 18, Rozel, Kansas.
EF-4, 170 mph winds, February 10, Hattiesburg, MS. 0 deaths, 82 injuries,
EF-3, 140 mph winds, May 15, Cleburne, TX. No deaths or injuries.
EF-3, 160 mph winds, January 30, Adairsville, GA. 1 death, 17 injuries, 363 buildings damaged or destroyed.
EF-3, 145 mph winds, April 11, Kemper County, AL. 1 death, 9 injuries.
EF-3, 136 - 165 mph winds, May 19, Luther - Carney, Oklahoma.

Moore tornado likely to be one of the five most damaging tornadoes in history
Moore has the unenviable distinction of having previously experienced the 4th costliest tornado in world history, the notorious May 3, 1999 Bridgecreek-Moore EF-5 tornado. There have been only six billion-dollar (2011 dollars) tornadoes in history:

1) Joplin, Missouri, May 22, 2011, $2.8 billion
2) Topeka, Kansas, June 8, 1966, $1.7 billion
3) Lubbock, Texas, May 11, 19780, $1.5 billion
4) Bridge Creek-Moore, Oklahoma, May 3, 1999, $1.4 billion
5) Xenia, Ohio, April 3, 1974, $1.1 billion
6) Omaha, Nebraska, May 6, 1975, $1 billion

The May 3, 1999 Bridge Creek-Moore tornado killed 36 people and injured 583. It damaged or destroyed 8132 homes, 1041 apartments, 260 businesses, 11 public buildings and seven churches. According to rough estimates of the size of the damaged area made by helicopters operated by news9.com and kfor.com, the damage footprint from the May 20, 2013 tornado is easily twice as large. I expect that after the damage tally from the May 20 tornado is added up, Moore will hold two of the top five spots on the list of most damaging tornadoes in history, and the May 20 tornado may approach the Joplin tornado as the costliest twister of all-time.


Figure 6. Severe weather outlook for Tuesday, May 21, calls for a "Moderate Risk" of severe weather over Northeast Texas, Southwest Arkansas, and small portions of Southeast Oklahoma and Northwest Louisiana. You can follow today's severe weather outbreak from our Severe Weather page.

Here we go again: Another big severe weather day today in the Midwest
The Moore tornado was the first of twenty tornadoes reported on May 20--the third consecutive day with twenty or more tornadoes in the Midwest. Each of these days had a "Moderate Risk" of severe weather, as advised by NOAA's Storm Prediction Center (SPC.) The SPC is calling for a fourth consecutive day with a "Moderate Risk" of severe weather today (Tuesday), with the greatest danger occurring over Northeast Texas, Southwest Arkansas, and small portions of Southeast Oklahoma and Northwest Louisiana. Once again, we can expect to see isolated supercells capable of spawning dangerous violent tornadoes during the late afternoon and early evening hours. The severe weather outbreak moves east and will begin to wind down on Wednesday, when only a "Slight Risk" of severe weather is expected over New York, Ohio, Pennsylvania, plus northern portions of Kentucky, West Virginia, and Maryland.


Video 1. Remarkable time-lapse sequence of the Moore, Oklahoma tornado on May 20, 2013, taken from a news helicopter.


Video 2. Stormchasers caught the dramatic sounds and sights of the Moore, Oklahoma tornado of May 20, 2013 as it moved through the city.


Video 3. Video of the Moore, Oklahoma tornado of May 20, 2013 taken from a smartphone as the tornado moved across an open field.

Jeff Lechus filmed this remarkable video from his car while trying to get to his son. The flying debris near his car was extremely dangerous, and he is lucky he is alive.

Wunderground's weather historian Christopher C. Burt discusses the deadliest tornadoes of all time in his April, 2011 post. Since that post, the Joplin, Missouri tornado of May 22, 2011, killed 158 people, making it the 7th deadliest tornado in history.

My post, 2011: Year of the Tornado from December 2011, detailing the remarkable tornado records set in 2011.

I saved a 10-frame animation of the radar reflectivity image from the Moore tornado here.

I greatly appreciate all the valuable links members of the WU community have posted here, and I have used many of them in my posts over the past day. Keep up the great work!

How to help
Portlight Strategies, an organization that supports disaster victims with disabilities, will be working with shelter operators and disability stakeholder organizations in Oklahoma to serve the needs of people with disabilities. Further information and how to offer additional support can be found on their website.

Donations can be made to American Red Cross disaster relief at redcross.org/weather or by texting WEATHER to 90999 to donate $10.

Donations can be made on The Salvation Army's website or by texting STORM to 80888 to donate $10. You can also call to make donations of other monetary amounts at (800) 725-2769.

Jeff Masters

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Statement as of 12:44 PM EDT on May 21, 2013
... A Severe Thunderstorm Warning remains in effect until 100 PM EDT
for east central Ontario County...


At 1242 PM EDT... National Weather Service Doppler radar continued to
indicate a severe thunderstorm capable of producing Golf Ball size
hail... and damaging winds in excess of 60 mph. This storm was
located 7 miles west of Geneva and just north of Route 20... moving
east at 15 mph.

Some locations in the warning include...
Geneva...

Lat... Lon 4286 7719 4294 7717 4291 7696 4288 7695
4286 7697 4281 7697
time... Mot... loc 1644z 266deg 13kt 4288 7711




Member Since: April 30, 2013 Posts: 6 Comments: 4448
Quoting SLU:
Rather well defined tropical wave for late-May in the CATL with a surface low associated with it.



We'll see if that wave will make it all the way to the western Caribbean and serve as a catalyst for development down the road. No guarantees though.
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MORNING CONVECTION-ALLOWING WRF AND HRRR
SIMULATIONS ARE INSISTENT THAT UPSCALE GROWTH WILL OCCUR THROUGHOUT
THE AFTERNOON. GIVEN THE DEGREE OF INSTABILITY...BUOYANCY AND
SHEAR...SETUP MAY YIELD A DERECHO ACCELERATING EWD TOWARDS THE
ARKLATEX REGION BY EARLY EVENING. HERE TOO...THE STRONGEST LOW-LEVEL
S/SWLYS WILL REMAIN...PROMOTING EMBEDDED MESOVORTICES CAPABLE OF
PRODUCING A COUPLE OF SIGNIFICANT TORNADOES. OTHERWISE...POTENTIAL
DOES EXIST FOR WIDESPREAD/DESTRUCTIVE DAMAGING WIND GUSTS.

Member Since: Posts: Comments:
Thanks for this update Dr. Masters
Member Since: September 16, 2010 Posts: 0 Comments: 1219
HEED ALL WARNINGS REGARDING SEVERE WEATHER
THE LIFE YOU SAVE MAY BE YOUR OWN
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Member Since: April 30, 2013 Posts: 6 Comments: 4448


This is a contour plot of total totals index with a contour interval of 2. The TT field shows instability in the atmosphere based on the lapse rate from 850 to 500 mb plus dewpoint at 850 mb. Where TTs are greater than 45, thunderstorms are possible. The higher the number, the more unstable the atmosphere is and as a result, the bold the thunderstorms could become. Values of 52 or higher indicate areas where severe thunderstorms are possible. Values <40 indicate areas of stable weather where skies are generally clear.

Member Since: July 15, 2006 Posts: 187 Comments: 58154
Quoting wunderkidcayman:

Either way its still going to end up in the Caribbean and eventually develop
Still to early to say.
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The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
northeastern Ontario County in western New York
south central Wayne County in western New York


This also includes the New York thruway between exits 42 and 43.

* Until 130 PM EDT

* at 1228 PM EDT... National Weather Service Doppler radar indicated a
severe thunderstorm capable of producing quarter size hail... and
damaging winds in excess of 60 mph. This storm was located 7 miles
west of Clifton Springs... or 7 miles north of Canandaigua... and
moving east at 20 mph.

* Some locations in the warning include...
Clifton Springs...
Newark...
Lyons...

Precautionary/preparedness actions...

In addition to large hail and damaging winds... continuous cloud to
ground lightning is occurring with this storm. Move indoors
immediately! Lightning is one of natures number one killers.
Remember... if you can hear thunder... you are close enough to be
struck by lightning.


Lat... Lon 4295 7730 4302 7731 4314 7690 4301 7688
4301 7696 4296 7695 4291 7696
time... Mot... loc 1632z 256deg 16kt 4299 7725



Member Since: April 30, 2013 Posts: 6 Comments: 4448


Member Since: July 15, 2006 Posts: 187 Comments: 58154
Quoting Torito:


Yea it may drift into the EPAC and develop or stay there and eventually make its way into the CARRIB, but the development should be quicker if it gets into the epac.

Either way its still going to end up in the Caribbean and eventually develop
Member Since: June 13, 2009 Posts: 2 Comments: 13012
38. SLU
Rather well defined tropical wave for late-May in the CATL with a surface low associated with it.



Member Since: Posts: Comments:
TOR:CON -

TX northeast - 6

AR southwest - 5
LA northwest - 5
OK southeast - 5

AR north, northeast - 4
TX central - 4

IN south - 3
IL south - 3
MO central, south - 3
TN west - 3
TX south - 3

Member Since: April 30, 2013 Posts: 6 Comments: 4448
southern ontario regions

12:21 PM EDT Tuesday 21 May 2013
Severe thunderstorm watch
Severe thunderstorms possible through early evening.

This is an alert to the potential development of severe thunderstorms with large hail, damaging winds or heavy rainfall. Monitor weather conditions and listen for updated bulletins.

Conditions are favourable for the development of severe thunderstorms today. Thunderstorms have already developed in some areas and the activity is expected to intensify through the afternoon hours. Large hail and damaging winds are expected to be the main threats. An isolated tornado can also not be ruled out.
Member Since: July 15, 2006 Posts: 187 Comments: 58154
Member Since: July 15, 2006 Posts: 187 Comments: 58154
Thanks for the recap. I will not look at the Blog the same way after yesterday's event. We routinely follow radar loops on this site in real time during hurricanes and severe weather events and comment on the radar signatures as they are posted. I do not have television in the office and was just watching the loops on here as everyone saw the definition and the tornado growing before our very eyes as it was happening. Then, pictures start to get posted and I go home and watch the TV coverage of the damage on the ground and lives lost.

Technology allowed us on here to witness this tragedy in real time as it happened. Will make me think twice about the damage on the ground next time I am viewing a radar loop, from the comfort of my home or office, of a tornado on the ground or a hurricane eye wall making landfall or traversing a populated area.

A very sad and sobering moment for us all yesterday and today.
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yellow severe thunderstorm watch
red severe thunderstorm warnings
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Quoting GeorgiaStormz:

Brad Panovich
Shared publicly - 12:11 PM
#Tornado


Animated gif of the radar from yesterday in Moore, OK. I've been looking through the data and a few things stick out.

#1 2-3 intersecting boundaries appears to have played a huge role in tornado intensification over Moore.

#2 There was some enhanced inflow from the southwest. Notice the returns moving in quickly from the SW then colliding with the storms right at intensification

#3 It appears once the circulation wrapped inward towards the BWER is the time it intensified. This is likely when it got to a location where the RFD and Updraft were ideal for intensification.



Member Since: April 30, 2013 Posts: 6 Comments: 4448

383
WGUS52 KCHS 211627
FFWCHS
SCC019-211830-
/O.NEW.KCHS.FF.W.0004.130521T1627Z-130521T1830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000 Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CHARLESTON SC
1227 PM EDT TUE MAY 21 2013

THE NATIONAL WEATHER SERVICE IN CHARLESTON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
CENTRAL CHARLESTON COUNTY IN SOUTHEAST SOUTH CAROLINA...

* UNTIL 230 PM EDT

* AT 1224 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR
INDICATED VERY HEAVY RAIN OCCURRING NEAR JAMES ISLAND COUNTY PARK.
THE AREA OF HEAVY RAIN WAS NEARLY STATIONARY.

UP TO 4 1/2 INCHES OF RAIN IS ESTIMATED TO HAVE FALLEN OVER THE
PAST HOUR AND A HALF ON PARTS OF JAMES ISLAND. WATER IS PONDING IN
YARDS AND DRIVEWAYS.

* FLASH FLOODING IS EXPECTED IN AND AROUND...
JAMES ISLAND COUNTY PARK...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

AVOID DRIVING INTO WATER ON THE ROAD. THE WATER IS USUALLY DEEPER
THAN IT APPEARS AND THE ROAD MAY BE WASHED OUT. ONLY ONE FOOT OF
WATER WILL STALL A VEHICLE AND LESS THAN TWO FEET OF WATER CAN FLOAT
AND CARRY AWAY A VEHICLE. FLOODING IS THE NUMBER ONE WEATHER-RELATED
CAUSE OF DEATH IN THE UNITED STATES. WHEN ENCOUNTERING FLOODED ROADS
MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

TO REPORT FLOODING...CONTACT THE NATIONAL WEATHER SERVICE IN
CHARLESTON TOLL FREE AT 1-888-383-2024.



LAT...LON 3266 7999 3273 8004 3277 7999 3270 7991
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Member Since: April 30, 2013 Posts: 6 Comments: 4448
Brad Panovich
Shared publicly - 12:11 PM
#Tornado


Animated gif of the radar from yesterday in Moore, OK. I've been looking through the data and a few things stick out.

#1 2-3 intersecting boundaries appears to have played a huge role in tornado intensification over Moore.

#2 There was some enhanced inflow from the southwest. Notice the returns moving in quickly from the SW then colliding with the storms right at intensification

#3 It appears once the circulation wrapped inward towards the BWER is the time it intensified. This is likely when it got to a location where the RFD and Updraft were ideal for intensification.


Link
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Quoting wunderkidcayman:
thanks Doc

by the way SW Caribbean its actually spining
12N 83W



Yea it may drift into the EPAC and develop or stay there and eventually make its way into the CARRIB, but the development should be quicker if it gets into the epac.
Member Since: April 30, 2013 Posts: 6 Comments: 4448
Quoting Patrap:


Here me tink,

www.reecominc.com

Thanks for the link!
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Wow.. 0:54 in that Jeff Lechus video is the first time in years I've actually yelled at my screen. "You're going FORWARD?!"
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Quoting DrMickey:
Patrap:
Asked this question just before the new blog:
Whatever happened to Reecom? I have one of their radios but I don't see anyone selling them nowadays.


There are around - or at least still have a website. Link
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Quoting DrMickey:
Patrap:
Asked this question just before the new blog:
Whatever happened to Reecom? I have one of their radios but I don't see anyone selling them nowadays.


Here me tink,

www.reecominc.com
Member Since: July 3, 2005 Posts: 431 Comments: 131960
Nasty storms still in progress near fredrick.

Member Since: April 30, 2013 Posts: 6 Comments: 4448
Thank you Dr. Masters for the continuing coverage and explanations

Anouk - "Birds" - a sad (but beautiful) new song which could be dedicated to all suffering right now ... (youtube-link)
Isolated from the outside
Clouds have taken all the light
I have no control it seems my
Thoughts wander off ...
Birds falling down the rooftops
Out of the sky like raindrops

Lyrics
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North Little Rock
NEXRAD Radar

Base Reflectivity 0.50° Elevation
Range 124 NMI

Member Since: July 3, 2005 Posts: 431 Comments: 131960
Patrap:
Asked this question just before the new blog:
Whatever happened to Reecom? I have one of their radios but I don't see anyone selling them nowadays.
Member Since: Posts: Comments:
College of DuPage Meteorology
Severe Weather and Flash Flood Warnings


Note: This page will reload every 2 minutes. Warnings are listed with the most recent first.
Click on the station ID to bring up list of recent severe weather statements.
Member Since: July 3, 2005 Posts: 431 Comments: 131960
Thanks Doc. Let us hope that day is far less destructive than the past two days.
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Toronto Pearson Int'l Airport
Date: 12:00 PM EDT Tuesday 21 May 2013
Condition:Partly Cloudy
Pressure:29.8 inches
Tendency:falling
Visibility:10 miles
Temperature:69.8°F
Dewpoint:63.7°F
Humidity:81%
Wind:SE 7 mph
Humidex: 80
Member Since: July 15, 2006 Posts: 187 Comments: 58154
Cells dont seem to be becoming violent as fast today..content witih being dangerous severe tstorms so far.
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You must understand the whole of life, not just one little part of it.
That is why you must read, that is why you must look at the skies, that is why you must sing and dance, and write poems and suffer and understand, for all that is life.


Jiddu Krishnamurti
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thanks for the lunch time read doc
lets hope today is not as bad
but iam sure there will be something
Member Since: July 15, 2006 Posts: 187 Comments: 58154
thanks Doc

by the way SW Caribbean its actually spining
12N 83W

Member Since: June 13, 2009 Posts: 2 Comments: 13012
Frederick Radar

NEXRAD Radar

Base Reflectivity 0.50° Elevation
Range 124 NMI

Member Since: July 3, 2005 Posts: 431 Comments: 131960
Member Since: July 3, 2005 Posts: 431 Comments: 131960
Thanks, Doc
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SEL1

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 201
NWS STORM PREDICTION CENTER NORMAN OK
1025 AM CDT TUE MAY 21 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF
SOUTHERN OKLAHOMA
NORTHERN AND CENTRAL TEXAS

* EFFECTIVE THIS TUESDAY MORNING AND EVENING FROM 1025 AM UNTIL
700 PM CDT.

* PRIMARY THREATS INCLUDE...
SEVERAL TORNADOES WITH A FEW INTENSE TORNADOES POSSIBLE
NUMEROUS DAMAGING WIND GUSTS LIKELY WITH A FEW SIGNIFICANT GUSTS
TO 80 MPH POSSIBLE
SEVERAL LARGE HAIL EVENTS WITH A FEW VERY LARGE HAIL EVENTS TO 3
INCHES IN DIAMETER POSSIBLE

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 95 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 50 MILES SOUTH SOUTHWEST OF
ABILENE TEXAS TO 35 MILES SOUTH SOUTHEAST OF PARIS TEXAS. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU1).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.

&&

DISCUSSION...AIDED BY FORCING ASSOCIATED WITH A SHORT WAVE IMPULSE
TURNING EAST OF THE SOUTHERN HIGH PLAINS...INCREASING THUNDERSTORM
DEVELOPMENT IS EXPECTED DURING THE NEXT FEW HOURS ALONG A SURFACE
COLD FRONT AND REMNANT OUTFLOW BOUNDARY ACROSS THE WW AREA. THE
OUTFLOW BOUNDARY...SITUATED NEAR OR JUST SOUTH OF THE RED RIVER MAY
BECOME THE FOCUS FOR AN INCREASINGLY ORGANIZED MESOSCALE CONVECTIVE
SYSTEM CAPABLE OF PRODUCING DAMAGING WINDS...LARGE HAIL AND ISOLATED
TORNADOES. DISCRETE SUPERCELLS ARE POSSIBLE ALONG THE TRAILING
SOUTHERN FLANK OF THE DEVELOPING SYSTEM...SOUTHWARD THROUGH CENTRAL
TEXAS BY THIS AFTERNOON...AS WELL AS AHEAD OF THE SQUALL LINE ACROSS
NORTHERN TEXAS. ONE OR TWO STRONG TORNADOES MAY NOT BE OUT OF THE
QUESTION.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 27035.


...KERR
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Thanks Doctor Masters !

Truly a very sad day .
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The multi-media briefing for today from NOAA
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Thanks, Doc. I keep seeing your name all over....prayers for Moore.
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Jeff co-founded the Weather Underground in 1995 while working on his Ph.D. He flew with the NOAA Hurricane Hunters from 1986-1990.

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