Dangerous tornado outbreak expected Saturday; Gulf of Mexico SSTs warmest on record

By: Dr. Jeff Masters , 2:57 PM GMT on April 13, 2012

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A dangerous tornado outbreak is expected on Saturday over the Plains, says NOAA's Storm Prediction Center (SPC). Warm, moist air flowing northwards from a Gulf of Mexico that has record-warm waters will collide with cold air funneling down from Canada, creating a highly unstable air mass capable of creating strong thunderstorm updrafts. An impressive upper-level low, accompanied by a jet stream with 105 - 125 mph winds at middle levels of the atmosphere, will create plenty of wind shear, giving the air the spin it needs to form tornadoes. SPC has has issued their highest level of alert, a "High Risk," for much of Oklahoma, Kansas, and Nebraska for Saturday. Included in the "High Risk" area are the cities of Wichita, Oklahoma City, and Lincoln. This is the second time SPC has issued a "High Risk" forecast this year; the first "High Risk" forecast came for the March 2 tornado outbreak, which killed 41 people and did $1.5 - $2 billion in damage. It is very unusual for SPC to issue a "High Risk" forecast more than a day in advance of a suspected tornado outbreak; according to Wikipedia, today's "High Risk" forecast is only the second time SPC has ever done this. The other instance was for the April 6 - 8, 2006 tornado outbreak focused over Tennessee, which generated 73 tornadoes that killed 13 and did $1.5 billion in damage. People living in the threatened area need to pay close attention on Saturday to this dangerous severe weather situation.


Figure 1. Severe weather risk for Saturday, April 14, 2012, from NOAA's Storm Prediction Center.

Gulf of Mexico water temperatures the warmest on record
Temperatures in the states bordering the Gulf of Mexico were the 3rd - 7th warmest on record during the first three months of 2012, according to NOAA's National Climatic Data Center. This allowed Sea Surface Temperatures (SSTs) in the Gulf of Mexico (25 - 30°N, 85 - 90°W) to climb to 1.4°C (2.5°F) above average during March 2012, according to a wunderground analysis of the Hadley Centre SST data set. This is the warmest March value on record for the Gulf of Mexico, going back over a century of record keeping. During the first two weeks of April, Gulf of Mexico waters remained about 1.5°C above average, putting April on pace to have the warmest April water temperatures on record. Only one year in the past century has had April water temperatures in the Gulf of Mexico more than 1.1°C above average; that year was 2002 (1.4°C above average.) All that record-warm water is capable of putting record amounts of water vapor into the air, since evaporation increases when water is warmer. Because moist air is less dense than dry air, this warm, moist air flowing northwards from the Gulf of Mexico into the developing storm system over the Plains will be highly unstable once it encounters cold, dry air aloft. The record-warm waters of the Gulf of Mexico are a key reason for the high risk of severe weather over the Plains this weekend.


Figure 2. Departure of Sea Surface Temperature (SST) from average for April 12, 2012, as computed by NOAA/NESDIS. SSTs in the Gulf of Mexico are at their warmest levels on record for this time of year.

Follow Weather Underground on twitter for the latest on this potential severe weather outbreak.

Jeff Masters

April Storms (llpj04)
this storm greeted me as I came out of the grocery store, chased me home and got to my driveway the same time I did.
April Storms
Lightning Up the Pond - Oklahoma (mbryan777)
Last night we had a pretty spectacular lightning storm. I put the camera on the tripod in time-lapse mode and laid on my back on the hillside above the pond taking in an amazing show. When it got more exciting than I was comfortable with, I ran for the house.
Lightning Up the Pond - Oklahoma

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BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE WICHITA KS
930 PM CDT SAT APR 14 2012

THE NATIONAL WEATHER SERVICE IN WICHITA HAS ISSUED A

* TORNADO WARNING FOR...
SEDGWICK COUNTY IN SOUTH CENTRAL KANSAS...

* UNTIL 1015 PM CDT

* AT 927 PM CDT...A CONFIRMED LARGE AND EXTREMELY DANGEROUS
TORNADO WAS LOCATED NEAR ARGONIA...AND MOVING NORTHEAST AT 30 TO
40 MPH.

THIS IS A PARTICULARLY DANGEROUS SITUATION.

HAZARD...DAMAGING TORNADO.

SOURCE...RADAR CONFIRMED TORNADO.

IMPACT...MAJOR HOUSE AND BUILDING DAMAGE LIKELY AND COMPLETE
DESTRUCTION POSSIBLE. NUMEROUS TREES SNAPPED. MAJOR POWER
OUTAGES IN PATH OF TORNADO HIGHLY LIKELY. SOME ROADS
POSSIBLY BLOCKED BY TORNADO DEBRIS. COMPLETE DESTRUCTION
OF VEHICLES LIKELY.

* LOCATIONS IMPACTED INCLUDE...
DOWNTOWN WICHITA...VIOLA...CLEARWATER...GODDARD...WICHITA MID
CONTINENT AIRPORT...HAYSVILLE...SOUTH WICHITA...WEST WICHITA...
MCCONNELL AIR FORCE BASE...DERBY...EAST WICHITA...MAIZE...
MULVANE...COLWICH...PARK CITY...NORTHEAST WICHITA...LAKE AFTON...
OAKLAWN...BEL AIRE AND JABARA AIRPORT.

THIS INCLUDES THE KANSAS TURNPIKE BETWEEN MILE MARKERS 34 AND 54.
THIS INCLUDES INTERSTATE 135 BETWEEN MILE MARKERS 0 AND 16.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TO REPEAT...A LARGE...EXTREMELY DANGEROUS AND POTENTIALLY DEADLY
TORNADO IS ON THE GROUND. TO PROTECT YOUR LIFE...TAKE COVER NOW. MOVE
TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING. AVOID
WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR OUTDOORS...MOVE TO THE
CLOSEST SUBSTANTIAL SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS.

TORNADOES ARE DIFFICULT TO SEE AND CONFIRM AT NIGHT. TAKE COVER NOW.

&&

LAT...LON 3748 9780 3784 9752 3783 9715 3747 9716
TIME...MOT...LOC 0230Z 216DEG 28KT 3731 9770

TORNADO...OBSERVED
TORNADO DAMAGE THREAT...SIGNIFICANT
HAIL...2.50IN

$$
Member Since: July 6, 2010 Posts: 112 Comments: 31315
1855 RTSplayer" [Link to] Fujita scale up to F12

Even as a hypothetical extension based on the FujitaScale, the creator didn't know what he was doing.
Try a reconstruction from the bottom up as a logarithmically-increasing power scale.
Member Since: August 21, 2007 Posts: 0 Comments: 4860
1955. LargoFl
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DODGE CITY KS
926 PM CDT SAT APR 14 2012

KSC185-150245-
/O.CON.KDDC.TO.W.0031.000000T0000Z-120415T0245Z/
STAFFORD KS-
926 PM CDT SAT APR 14 2012

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHERN STAFFORD COUNTY
UNTIL 945 PM CDT...

AT 922 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED VERY
STRONG ROTATION ASSOCIATED WITH A CONFIRMED LARGE AND EXTREMELY
DANGEROUS TORNADO 4 MILES NORTH OF ST. JOHN. THIS TORNADIC STORM WAS
MOVING NORTHEAST AT 45 MPH. DANGEROUS AND EXTREMELY DESTRUCTIVE HAIL
UP TO SOFTBALL SIZE IS ALSO EXPECTED WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
ST. JOHN...
HUDSON...
MAINLY RURAL AREAS OF NORTHERN STAFFORD COUNTY.

AT 923 PM CDT...LAW ENFORCEMENT REPORTED A LARGE TORNADO 2 MILES
NORTHWEST OF SAINT JOHN. HUDSON IS NEAR THE PATH OF THIS TORNADO.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TO REPEAT...A LARGE...EXTREMELY DANGEROUS AND POTENTIALLY DEADLY
TORNADO IS CONFIRMED! TO PROTECT YOUR LIFE...TAKE COVER NOW. MOVE TO
AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING. AVOID
WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR OUTDOORS...MOVE TO THE
CLOSEST SUBSTANTIAL SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS.

TORNADOES AT NIGHT ARE ESPECIALLY DANGEROUS. DO NOT WAIT UNTIL YOU
SEE OR HEAR THE TORNADO...IT MAY BE TOO LATE. TAKE COVER NOW!

&&

LAT...LON 3795 9885 3801 9891 3827 9890 3827 9847
3794 9847
TIME...MOT...LOC 0225Z 222DEG 40KT 3808 9871
HAIL 4.25IN

$$

RUSSELL
Member Since: August 6, 2011 Posts: 4 Comments: 36624
Quoting ILwthrfan:
Hudson's gone. 


source?
Member Since: Posts: Comments:
Hudson, KS "the real deal" according to live feed.
Link
Member Since: Posts: Comments:
Quoting ILwthrfan:
Hudson's gone. 

What?
Member Since: July 6, 2010 Posts: 112 Comments: 31315
This one doesn't look as bad as the other two, but is still very dangerous.



Member Since: August 2, 2006 Posts: 46 Comments: 11659
Hudson is getting a direct hit from a large and extremely dangerous tornado.
Member Since: Posts: Comments:
Hudson's gone. 
Member Since: Posts: Comments:
1948. LargoFl
SEVERE THUNDERSTORM WARNING
NEC035-059-129-169-150300-
/O.NEW.KGID.SV.W.0050.120415T0221Z-120415T0300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE HASTINGS NE
921 PM CDT SAT APR 14 2012

THE NATIONAL WEATHER SERVICE IN HASTINGS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
CLAY COUNTY IN SOUTH CENTRAL NEBRASKA...
NORTHWESTERN FILLMORE COUNTY IN SOUTH CENTRAL NEBRASKA...
NORTHERN NUCKOLLS COUNTY IN SOUTH CENTRAL NEBRASKA...
NORTHWESTERN THAYER COUNTY IN SOUTH CENTRAL NEBRASKA...

* UNTIL 1000 PM CDT

* AT 919 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING PING PONG BALL SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS
LOCATED 6 MILES NORTH OF NELSON...OR 27 MILES SOUTHEAST OF
HASTINGS...AND MOVING NORTHEAST AT 50 MPH.

* LOCATIONS IMPACTED INCLUDE...
OAK...FAIRFIELD...EDGAR...DAVENPORT...CLAY CENTER...ONG...
SHICKLEY...SARONVILLE...SUTTON...GENEVA...GRAFTON. ..FAIRMONT AND
EXETER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

THIS IS A SUPERCELL THUNDERSTORM. DUE TO THE ROTATING NATURE OF THESE
STORMS...THEY ARE CAPABLE OF PRODUCING ALL TYPES OF SEVERE WEATHER...
INCLUDING EXTREMELY LARGE HAIL...DESTRUCTIVE STRAIGHT LINE WINDS AND
POSSIBLY TORNADOES. MOVE QUICKLY TO A SAFE SHELTER...PREFERABLY INTO
AN INTERIOR ROOM...SUCH AS A BATHROOM OR A CLOSET...OR INTO A
BASEMENT.

&&

LAT...LON 4020 9783 4021 9810 4030 9825 4069 9802
4070 9736
TIME...MOT...LOC 0221Z 219DEG 45KT 4030 9804
WIND...HAIL 60MPH 1.50IN

$$

ADO
Member Since: August 6, 2011 Posts: 4 Comments: 36624
Quoting ScottLincoln:


Which says little-to-nothing about how they could possibly estimate width of a tornado at night. All that proves is that they saw something that probably was on the ground.
You can get a general idea.
Member Since: July 22, 2010 Posts: 1 Comments: 3841
Argonia was probably destroyed.



Headed for downtown Wichita, KS
Member Since: July 6, 2010 Posts: 112 Comments: 31315
macksville ks has a population of aprox 500
Member Since: Posts: Comments:
St. John has a large tornado confirmed on the ground.
Member Since: Posts: Comments:
Not good... Wichita is still not out.
Member Since: Posts: Comments:
St. John's/Old Greensburg storm:



Member Since: August 2, 2006 Posts: 46 Comments: 11659
Large tornado confirmed on the north side of St. John.
Member Since: Posts: Comments:
Quoting ScottLincoln:


You sound just like some people ranting about the Tuscaloosa/Birmingham tornado of last year. Not even one of the most in-depth surveys ever done could convince them. The survey team even had one of the inventors of the modern EF-scale. Some people just cannot be convinced by evidence when they make up their mind without it.
I think we all need to calm down. Of course I am going to listen to the NWS official report. Just get caught in the moment you know? You have to realize this is a weather blog not a NWS office. People are going to get excited and speculate.
Member Since: July 22, 2010 Posts: 1 Comments: 3841
:\

Member Since: July 6, 2010 Posts: 112 Comments: 31315
1938. hydrus
Member Since: Posts: Comments:
1937. LargoFl
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE WICHITA KS
914 PM CDT SAT APR 14 2012

KSC077-191-150230-
/O.CON.KICT.TO.W.0028.000000T0000Z-120415T0230Z/
SUMNER KS-HARPER KS-
914 PM CDT SAT APR 14 2012

...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHEASTERN HARPER AND
SOUTHWESTERN SUMNER COUNTIES UNTIL 930 PM CDT...

AT 910 PM CDT...A CONFIRMED LARGE AND EXTREMELY DANGEROUS TORNADO WAS
LOCATED 6 MILES SOUTH OF ARGONIA...AND MOVING NORTHEAST AT 35 MPH.

THIS IS A PARTICULARLY DANGEROUS SITUATION.

HAZARD...DAMAGING TORNADO.

SOURCE...RADAR CONFIRMED TORNADO.

IMPACT...MAJOR HOUSE AND BUILDING DAMAGE LIKELY AND COMPLETE
DESTRUCTION POSSIBLE. NUMEROUS TREES SNAPPED. MAJOR POWER
OUTAGES IN PATH OF TORNADO HIGHLY LIKELY. SOME ROADS
POSSIBLY BLOCKED BY TORNADO DEBRIS. COMPLETE DESTRUCTION OF
VEHICLES LIKELY.

LOCATIONS IMPACTED INCLUDE...
ARGONIA AND MILAN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TO REPEAT...A LARGE...EXTREMELY DANGEROUS AND POTENTIALLY DEADLY
TORNADO IS ON THE GROUND. TO PROTECT YOUR LIFE...TAKE COVER NOW. MOVE
TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING. AVOID
WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR OUTDOORS...MOVE TO THE
CLOSEST SUBSTANTIAL SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS.

TORNADOES ARE DIFFICULT TO SEE AND CONFIRM AT NIGHT. TAKE COVER NOW.

&&

LAT...LON 3700 9778 3699 9811 3706 9816 3740 9774
3703 9749 3699 9769 3699 9777
TIME...MOT...LOC 0214Z 225DEG 29KT 3720 9776

TORNADO...OBSERVED
TORNADO DAMAGE THREAT...SIGNIFICANT
HAIL...2.75IN

$$

KLEINSASSER
Member Since: August 6, 2011 Posts: 4 Comments: 36624
1936. Tygor
It's been an exciting day following all the storms, but with the sun setting and storms heading for populated areas, all I have is a sick feeling in my stomach. Following the storms is definitely going from awe to dread.
Member Since: Posts: Comments:
Quoting 1900hurricane:
Upped the angle a bit, it was getting kinda noisy at the lowest angle.





This may hit Wichita
Member Since: June 17, 2011 Posts: 11 Comments: 6461
Quoting hurricanehunter27:
They caught it in a still frame.


Which says little-to-nothing about how they could possibly estimate width of a tornado at night. All that proves is that they saw something that probably was on the ground.
Member Since: September 28, 2002 Posts: 5 Comments: 3158
The right hook on the Saint John cell went directly over the intersection.

The left hook went a few miles west of there, I think.
Member Since: January 25, 2012 Posts: 33 Comments: 1520
Quoting hurricanehunter27:
Its a weather blog what do you think were gona do? Its ok to speculate.


He isn't doing anything to bash us, he's pointing out the wide range of possibilities. However, people should treat this as a major tornado.

KSN reporting now that a large wedge tornado is heading towards Anson.
Member Since: Posts: Comments:
Quoting TropicalAnalystwx13:

April 27, 2011 had a value of 38.
O_O* wow... I guess someone need to tell @wxbrad that.
Member Since: Posts: Comments:
Quoting hurricanehunter27:
At least an EF4. You cant tell me otherwise. Even the NWS official report later cannot tell me otherwise.


You sound just like some people ranting about the Tuscaloosa/Birmingham tornado of last year. Not even one of the most in-depth surveys ever done could convince them. The survey team even had one of the inventors of the modern EF-scale. Some people just cannot be convinced by evidence when they make up their mind without it.
Member Since: September 28, 2002 Posts: 5 Comments: 3158
Quoting ScottLincoln:


The best you can get from radar is that it is a significant tornado or a weak tornado. You might be able to tell if it has a higher chance of being a strong/violent tornado, but beyond that, there is no way to know and it is unwise to speculate that way.
Its a weather blog what do you think were gona do? Its ok to speculate.
Member Since: July 22, 2010 Posts: 1 Comments: 3841
1928. LargoFl
TORNADO WARNING
KSC145-185-150245-
/O.NEW.KDDC.TO.W.0031.120415T0212Z-120415T0245Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DODGE CITY KS
912 PM CDT SAT APR 14 2012

THE NATIONAL WEATHER SERVICE IN DODGE CITY HAS ISSUED A

* TORNADO WARNING FOR...
SOUTHEASTERN PAWNEE COUNTY IN SOUTH CENTRAL KANSAS...
STAFFORD COUNTY IN SOUTH CENTRAL KANSAS...

* UNTIL 945 PM CDT

* AT 908 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
VERY STRONG ROTATION ASSOCIATED WITH A CONFIRMED LARGE AND
EXTREMELY DANGEROUS TORNADO 2 MILES NORTHEAST OF MACKSVILLE. THIS
TORNADIC STORM WAS MOVING NORTHEAST AT 55 MPH. DANGEROUS AND
EXTREMELY DESTRUCTIVE HAIL UP TO SOFTBALL SIZE IS ALSO EXPECTED
WITH THIS STORM.

* LOCATIONS IMPACTED INCLUDE...
ST. JOHN...STAFFORD...RADIUM...ZENITH...SEWARD AND HUDSON.

THIS TORNADO WARNING REPLACES THE TORNADO WARNING PREVIOUSLY IN
EFFECT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TO REPEAT...A LARGE...EXTREMELY DANGEROUS AND POTENTIALLY DEADLY
TORNADO IS CONFIRMED! TO PROTECT YOUR LIFE...TAKE COVER NOW. MOVE TO
AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING. AVOID
WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR OUTDOORS...MOVE TO THE
CLOSEST SUBSTANTIAL SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS.

TORNADOES AT NIGHT ARE ESPECIALLY DANGEROUS. DO NOT WAIT UNTIL YOU
SEE OR HEAR THE TORNADO...IT MAY BE TOO LATE. TAKE COVER NOW!

&&

LAT...LON 3786 9901 3804 9903 3827 9893 3827 9847
3826 9847 3794 9847
TIME...MOT...LOC 0210Z 219DEG 49KT 3801 9892
HAIL 4.25IN

$$

RUSSELL
Member Since: August 6, 2011 Posts: 4 Comments: 36624
Upped the angle a bit, it was getting kinda noisy at the lowest angle.



Member Since: August 2, 2006 Posts: 46 Comments: 11659
Quoting Bluestorm5:
@wxbrad: Rapid Update Model has a STP of 15.8 near Pratt, KS. Didn't know it could go that high.

April 27, 2011 had a value of 38.
Member Since: July 6, 2010 Posts: 112 Comments: 31315
Any word on tornado near Marion-Hillsboro-Herington tornado? Haven't seen any posts on it in the last minutes....
Member Since: September 15, 2009 Posts: 426 Comments: 3580
@wxbrad: Rapid Update Model has a STP of 15.8 near Pratt, KS. Didn't know it could go that high.
Member Since: Posts: Comments:
Quoting TropicalAnalystwx13:
This is an EF5...



The best you can get from radar is that it is a significant tornado or a weak tornado. You might be able to tell if it has a higher chance of being a strong/violent tornado, but beyond that, there is no way to know and it is unwise to speculate that way.
Member Since: September 28, 2002 Posts: 5 Comments: 3158
Quoting ScottLincoln:


I wonder how people estimate these things at night...
They caught it in a still frame.
Member Since: July 22, 2010 Posts: 1 Comments: 3841
Quoting TropicalAnalystwx13:
This is an EF5...



Where are you getting these images?
Member Since: Posts: Comments:
Quoting TropicalAnalystwx13:
This is an EF5...


Or a black hole...
Member Since: August 2, 2006 Posts: 46 Comments: 11659


Preliminary count now at 73
Member Since: Posts: Comments:
Saint John is about to get wiped out.

Member Since: July 6, 2010 Posts: 112 Comments: 31315
Quoting weatherh98:


Omg it blacked out haha
Is this the one that's gonna go near witchita


Yep.
Member Since: Posts: Comments:
1916. LargoFl
Quoting Xyrus2000:


If the storm with the 3/4 mile wide monster stays on course and hits Wichita, it most certainly will go down in history. :P
my god can you imagine the damage, geez
Member Since: August 6, 2011 Posts: 4 Comments: 36624
Quoting TropicalAnalystwx13:
This is an EF5...

O_O* whoa... now we MIGHT have two EF5 from this outbreak.
Member Since: Posts: Comments:
Quoting TropicalAnalystwx13:
This is an EF5...

At least an EF4. You cant tell me otherwise. Even the NWS official report later cannot tell me otherwise.
Member Since: July 22, 2010 Posts: 1 Comments: 3841
Quoting TropicalAnalystwx13:
This is an EF5...



Omg it blacked out haha
Is this the one that's gonna go near witchita
Member Since: June 17, 2011 Posts: 11 Comments: 6461
Quoting TropicalAnalystwx13:
Three quarters of a mile wide tornado.
Quoting oddspeed:
3/4 mile wide :
Quoting Chicklit:
3/4 mile wide tornado headed toward Milan, KS according to life feed.
Link
Quoting photonchaser:
3/4 of a mile wide!

That's this storm.



Member Since: August 2, 2006 Posts: 46 Comments: 11659
Quoting Chicklit:
3/4 mile wide tornado headed toward Milan, KS according to life feed.
Link


I wonder how people estimate these things at night...
Member Since: September 28, 2002 Posts: 5 Comments: 3158
1910. LargoFl
SEVERE THUNDERSTORM WARNING
IAC011-095-103-107-113-183-150315-
/O.NEW.KDVN.SV.W.0012.120415T0214Z-120415T0315Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
914 PM CDT SAT APR 14 2012

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
SOUTHERN BENTON COUNTY IN EAST CENTRAL IOWA...
IOWA COUNTY IN EAST CENTRAL IOWA...
WESTERN JOHNSON COUNTY IN EAST CENTRAL IOWA...
SOUTHWESTERN LINN COUNTY IN EAST CENTRAL IOWA...
KEOKUK COUNTY IN SOUTHEAST IOWA...
WESTERN WASHINGTON COUNTY IN SOUTHEAST IOWA...

* UNTIL 1015 PM CDT.

* AT 909 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS
AROUND 60 MPH...AND QUARTER SIZE HAIL. THESE STORMS WERE LOCATED
APPROXIMATELY ALONG A LINE EXTENDING FROM BELLE PLAINE TO 16 MILES
SOUTHWEST OF DELTA...OR ALONG A LINE EXTENDING FROM 16 MILES
NORTHWEST OF MARENGO TO 10 MILES NORTHWEST OF OTTUMWA...AND MOVING
EAST AT 55 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
LADORA...VAN HORNE...KESWICK...BLAIRSTOWN...MILLERSBURG...
HAYESVILLE...SIGOURNEY...NEWHALL...NORTH ENGLISH...SOUTH ENGLISH...
CONROY...WILLIAMSBURG...NORWAY...PARNELL...HARPER. ..ATKINS...
KINROSS...AMANA...WALFORD...FAIRFAX...OXFORD...WEL LMAN...CEDAR
RAPIDS...SWISHER...SHUEYVILLE...TIFFIN...ELY...KAL ONA...RICHMOND...
NORTH LIBERTY...BERTRAM...OAKDALE...CORALVILLE AND LAKE MACBRIDE
STATE PARK.

THIS INCLUDES INTERSTATE 80 IN IOWA BETWEEN MILE MARKERS 205 AND 241.

THIS INCLUDES INTERSTATE 380 BETWEEN MILE MARKERS 1 AND 20.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. MOVE IMMEDIATELY INDOORS AND STAY AWAY
FROM WINDOWS.

&&

LAT...LON 4132 9242 4152 9234 4152 9230 4205 9230
4196 9147 4119 9180 4122 9242
TIME...MOT...LOC 0214Z 271DEG 47KT 4196 9220 4115 9243
WIND...HAIL 60MPH 1.00IN

$$

NICHOLS
Member Since: August 6, 2011 Posts: 4 Comments: 36624
I think the Saint John cell has at least two different tornadoes on it.


Member Since: January 25, 2012 Posts: 33 Comments: 1520
Quoting LargoFl:
man your sure right there, this night may go down in the history books


If the storm with the 3/4 mile wide monster stays on course and hits Wichita, it most certainly will go down in history. :P
Member Since: Posts: Comments:
Quoting ScottLincoln:

Ratings above F5 were not used operationally, even with the old scale.

Be careful not to confuse shear and actual wind speed. For an actual measured speed of "210+mph winds, you would need an actual pixel of about +180kts or -180kts. That is difficult to measure with doppler radar because it would be several times past the nyquist velocity and could only be displayed as a dealiased/reconstructed value.
But, @wxbrad on twitter, a very well respected person, just tweeted he got 207.2 mph wind scan. It's not coming from me.
Member Since: Posts: Comments:

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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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