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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1107. nigel20
Member Since: November 6, 2010 Posts: 11 Comments: 7870
I thoroughly agree with 1093 LavosPhoenix: ...while I appreciate people posting those GRLevel3 and other maps of tornado velocities, given the number of tornadoes and storms around today,
please post the location of the storm and/or radar it is found on.
Yes, the maps have small cities shown but it isn't always obvious where it is.
Plus it helps correlate what storm you are talking about.
I'm just trying to keep track of all the storms; and as you know in an outbreak like this with many tornadoes, it can be somewhat difficult or annoying.
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How unusual is it for NWS to issue a PDS warning?
Anyone know when that last time they did that?
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WWUS40 KWNS 141929
WWP7

TORNADO WATCH PROBABILITIES FOR WT 0167
NWS STORM PREDICTION CENTER NORMAN OK
0229 PM CDT SAT APR 14 2012

WT 0167
PROBABILITY TABLE:
PROB OF 2 OR MORE TORNADOES : 60%
PROB OF 1 OR MORE STRONG /F2-F5/ TORNADOES : 50%
PROB OF 10 OR MORE SEVERE WIND EVENTS : 30%
PROB OF 1 OR MORE WIND EVENTS >= 65 KNOTS : 30%
PROB OF 10 OR MORE SEVERE HAIL EVENTS : 70%
PROB OF 1 OR MORE HAIL EVENTS >= 2 INCHES : 60%
PROB OF 6 OR MORE COMBINED SEVERE HAIL/WIND EVENTS : 90%

&&
ATTRIBUTE TABLE:
MAX HAIL /INCHES/ : 2.5
MAX WIND GUSTS SURFACE /KNOTS/ : 60
MAX TOPS /X 100 FEET/ : 450
MEAN STORM MOTION VECTOR /DEGREES AND KNOTS/ : 22025
PARTICULARLY DANGEROUS SITUATION : NO

&&
FOR A COMPLETE GEOGRAPHICAL DEPICTION OF THE WATCH AND
WATCH EXPIRATION INFORMATION SEE WOUS64 FOR WOU7.

$$
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Quoting 1900hurricane:


WWUS40 KWNS 141948
WWP8

TORNADO WATCH PROBABILITIES FOR WT 0168
NWS STORM PREDICTION CENTER NORMAN OK
0248 PM CDT SAT APR 14 2012

WT 0168
PROBABILITY TABLE:
PROB OF 2 OR MORE TORNADOES : 40%
PROB OF 1 OR MORE STRONG /F2-F5/ TORNADOES : 20%
PROB OF 10 OR MORE SEVERE WIND EVENTS : 30%
PROB OF 1 OR MORE WIND EVENTS >= 65 KNOTS : 30%
PROB OF 10 OR MORE SEVERE HAIL EVENTS : 60%
PROB OF 1 OR MORE HAIL EVENTS >= 2 INCHES : 40%
PROB OF 6 OR MORE COMBINED SEVERE HAIL/WIND EVENTS : 70%

&&
ATTRIBUTE TABLE:
MAX HAIL /INCHES/ : 2.5
MAX WIND GUSTS SURFACE /KNOTS/ : 60
MAX TOPS /X 100 FEET/ : 500
MEAN STORM MOTION VECTOR /DEGREES AND KNOTS/ : 25030
PARTICULARLY DANGEROUS SITUATION : NO

&&
FOR A COMPLETE GEOGRAPHICAL DEPICTION OF THE WATCH AND
WATCH EXPIRATION INFORMATION SEE WOUS64 FOR WOU8.

$$


It's so small and cute:)
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WWUS40 KWNS 141948
WWP8

TORNADO WATCH PROBABILITIES FOR WT 0168
NWS STORM PREDICTION CENTER NORMAN OK
0248 PM CDT SAT APR 14 2012

WT 0168
PROBABILITY TABLE:
PROB OF 2 OR MORE TORNADOES : 40%
PROB OF 1 OR MORE STRONG /F2-F5/ TORNADOES : 20%
PROB OF 10 OR MORE SEVERE WIND EVENTS : 30%
PROB OF 1 OR MORE WIND EVENTS >= 65 KNOTS : 30%
PROB OF 10 OR MORE SEVERE HAIL EVENTS : 60%
PROB OF 1 OR MORE HAIL EVENTS >= 2 INCHES : 40%
PROB OF 6 OR MORE COMBINED SEVERE HAIL/WIND EVENTS : 70%

&&
ATTRIBUTE TABLE:
MAX HAIL /INCHES/ : 2.5
MAX WIND GUSTS SURFACE /KNOTS/ : 60
MAX TOPS /X 100 FEET/ : 500
MEAN STORM MOTION VECTOR /DEGREES AND KNOTS/ : 25030
PARTICULARLY DANGEROUS SITUATION : NO

&&
FOR A COMPLETE GEOGRAPHICAL DEPICTION OF THE WATCH AND
WATCH EXPIRATION INFORMATION SEE WOUS64 FOR WOU8.

$$
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The 45% tornado risk got shifted south.

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To clarify I mean where and when the location isn't obvious due to reference from a major or well known city instead of the smaller towns.
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Montgomery, Iowa (tornado warning, severe hail)

And Cloud, KS (severe hail)
Member Since: January 25, 2012 Posts: 33 Comments: 1520
Member Since: July 6, 2010 Posts: 113 Comments: 31502


MESOSCALE DISCUSSION 0529
NWS STORM PREDICTION CENTER NORMAN OK
0228 PM CDT SAT APR 14 2012

AREAS AFFECTED...N-CNTRL KS

CONCERNING...TORNADO WATCH 165...

VALID 141928Z - 142000Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 165 CONTINUES.

A LARGE...AND POTENTIALLY TORNADIC SUPERCELL IN MITCHELL COUNTY
KANSAS IS INTERACTING WITH A NWD-MOVING SFC WARM FRONT. THE
BAROCLINIC CIRCULATION ALONG THE WARM FRONT...ALONG WITH STRONGLY
UNSTABLE...BACKGROUND SSELY INFLOW OF 20-25 KT PER SFC OBS...WILL
SUPPORT A SUSTAINED SUPERCELL/TORNADO THREAT DURING THE NEXT HALF
HOUR TO HOUR...POSSIBLY LONGER. THE SUPERCELL MAY REORGANIZE AS A
LARGER MASS OF CONVECTION MOVES NEWD FROM LINCOLN COUNTY...WITH
ADDITIONAL MESOCYCLONES POTENTIALLY DEVELOPING OVER THE SRN FLANKS
OF MERGING CONVECTION THAT MAY APPROACH CLOUD AND OTTAWA
COUNTIES...POSSIBLY EVEN FARTHER EAST/NORTHEAST.

..COHEN.. 04/14/2012


ATTN...WFO...TOP...ICT...GID...

LAT...LON 39289710 38869750 38829830 39209859 39479856 39809839
39939797 39939750 39769701 39289710



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1066 Thundercloud01221991: not all tornado warnings have a visual tornado ... if radar indicates tornado then a warning is issued

But until the recent introduction of dual-polarity radar, the existent single-polarity radar has not been able to spot a tornado with any vaguely reasonable expectation of certainty. (I think that single polarity radar still dominates over dual-polarity in coverage area).
Even with dual polarity:
There's a strong tendency to wait for a debris ball before saying "There's probably a tornado there."
And an extremely strong tendency to wait for a visual sighting before saying "There is a tornado there." Offhand, I can't think of a single tornado being officially called before a visual sighting has been made.
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Ugh. Look at Kansas. Sheesh, Louise. They're still rebuilding Greensburg. That cell better stay away.
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Member Since: July 6, 2010 Posts: 113 Comments: 31502
A request please, while I appreciate people posting those GRLevel3 and other maps of tornado velocities, given the number of tornadoes and storms around today, please post the location of the storm and/or radar it is found on. Yes, the maps have small cities shown but it isn't always obvious where it is. Plus it helps correlate what storm you are talking about. I'm just trying to keep track of all the storms and as you know in an outbreak like this with many tornadoes it can be somewhat difficult or annoying.
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1092. hydrus
Maybe something interesting for Florida in a few days..
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Southern most warned storm in NW OK is starting to rotate and continues to intensify. Could be our next Tornado Warning of the day.
Member Since: October 17, 2010 Posts: 0 Comments: 1267
Buffalo OK needs a tornado warning.
Member Since: July 22, 2010 Posts: 1 Comments: 3841


MESOSCALE DISCUSSION 0525
NWS STORM PREDICTION CENTER NORMAN OK
0123 PM CDT SAT APR 14 2012

AREAS AFFECTED...CNTRL/WRN OK...ERN TX/OK PANHANDLES...WRN NORTH TX

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 141823Z - 142030Z

THE THREAT FOR SEVERE THUNDERSTORMS INCLUDING TORNADOES MAY INCREASE
THIS AFTERNOON...AND THE ISSUANCE OF A TORNADO WATCH IS POSSIBLE.

CONVECTIVE INITIATION MAY BECOME OF INCREASING CONCERN INTO
MID-AFTERNOON OWING TO A FEW APPARENT MESOSCALE PROCESSES:
1. LOW-LEVEL ASCENT ALONG A N-S-ORIENTED DRYLINE FROM THE ERN TX/OK
PANHANDLES ACROSS W TX THAT WILL SLOWLY MIX EWD DURING THE NEXT
COUPLE OF HOURS...AND MAY AID IN STORM INITIATION. SFC WINDS HAVE
SLIGHTLY VEERED WEST OF THE DRYLINE DURING THE LAST
HOUR...SUGGESTING THAT THE DRYLINE MAY BE MODESTLY SHARPENING WITH
AN ATTENDANT INCREASE IN LOW-LEVEL ASCENT. THE CUMULUS FIELD JUST
EAST OF THE DRYLINE APPEARS TO HAVE BECOME INCREASINGLY AGITATED PER
RECENT VIS SATELLITE IMAGES...WHICH COULD EVOLVE INTO DEEPENING
CONVECTION. STRONG HEATING AND DEEP BOUNDARY-LAYER CIRCULATIONS JUST
WEST OF THE DRYLINE WILL ALSO AID IN INITIATION.
2. A SECONDARY MOISTURE GRADIENT IS NOTED 30-50 MILES WEST OF THE
DRYLINE...WITH ATTENDANT ASCENT AUGMENTED BY AN
EWD-MIGRATING...SUBTLE MID-LEVEL SHORTWAVE TROUGH CROSSING THE AREA
PER WATER VAPOR IMAGERY. HIGH-BASED CUMULUS IS DEVELOPING OVER THE
CNTRL TX PANHANDLE WHERE THE MID-LEVEL ASCENT OVERLAYS THE SECONDARY
MOISTURE GRADIENT...AND THESE FEATURES MAY FOCUS INITIATION IN THE
ERN TX PANHANDLE DURING THE NEXT FEW HOURS.
3. A DIFFERENTIAL HEATING ZONE IS NOTED OVER WRN OK FROM ROGER MILLS
COUNTY SWD TOWARD WILBARGER COUNTY TX. THE VERTICAL CIRCULATION
WITHIN THIS ZONE OWING TO DIFFERENTIAL DIABATIC HEATING AND
DIFFERENTIAL VERTICAL MIXING RATES COULD ALSO FOCUS CONVECTIVE
INITIATION THIS AFTERNOON.

THUNDERSTORMS MAY ERUPT ALONG THE AFOREMENTIONED FEATURES BETWEEN
1930 AND 2100Z. IF CONVECTIVE INITIATION OCCURS...STORMS WOULD
RAPIDLY BECOME SEVERE. EFFECTIVE BULK SHEAR MAGNITUDES OF 45-55 KT
WILL FAVOR RAPID EVOLUTION TO FAST MOVING SUPERCELL STRUCTURES. WITH
531 M2/S2 OF EFFECTIVE SRH ACCORDING TO THE 17Z NORMAN RAOB...AND A
LARGE DEGREE OF STREAMWISE VORTICITY IN THE LOWEST 0.5
KM...TORNADOES...SOME STRONG...WILL BE OF CONCERN...CONTINGENT ON
THE INITIATION OF STORMS. THE MORE SUBSTANTIAL THREAT FOR STRONGER
TORNADOES WILL BE NORTH OF THE RED RIVER...WHERE THE ISSUANCE OF A
PARTICULARLY DANGEROUS SITUATION TORNADO WATCH WILL BE POSSIBLE. THE
THREAT COULD BE SOMEWHAT LOWER SOUTH OF THE RED RIVER...WHERE
LOW-LEVEL SHEAR MAY NOT BE AS STRONG AND CONVECTIVE COVERAGE NOT AS
GREAT.

ULTIMATELY...THE ISSUANCE OF A TORNADO WATCH WILL BE CONTINGENT ON
AN INCREASINGLY APPARENT UPTICK IN CONVECTION...FOR WHICH SOME
UNCERTAINTY REMAINS. SATELLITE AND OBSERVATIONAL TRENDS WILL
CONTINUE TO BE MONITORED...WITH A WW...OR PERHAPS MULTIPLE
WATCHES...POSSIBLY BEING ISSUED BY MID-AFTERNOON.

..COHEN.. 04/14/2012


ATTN...WFO...FWD...OUN...LUB...AMA...

LAT...LON 35520075 36640081 36930060 36840013 36259953 36159861
36119725 35209714 34139728 33509810 33569963 34640038
35520075
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1088. Speeky
bad day in weather
Member Since: April 10, 2009 Posts: 1 Comments: 296
This one looks really bad.



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Quoting nigel20:

hopefully no major damage or injuries?


Honesty I'm doubting everyone is alright
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A couple of the new ones along the dry line look like they could really get going rather soon.

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Oops. Someone already posted the counties added to the Oklahoma PDS watch. Thanks
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1083. nigel20
Quoting weatherh98:


Quite a bit, tornadoes in kansas

hopefully no major damage or injuries?
Member Since: November 6, 2010 Posts: 11 Comments: 7870
A couple of other cells that aren't as pretty to look at are being tornado warned as well. These look like they are rain-wrapped.







This one is particularly nasty looking!



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Storm moving towards Burdett is extremely dangerous.
Member Since: July 8, 2005 Posts: 259 Comments: 23590
1080. Speeky
I expect bad things from this storm:
Member Since: April 10, 2009 Posts: 1 Comments: 296
1079. wxmojo
The crazy talk weather modification analysis indicates the recent lull was due to a switching of the modification grid.

askwhy333.minus.com/mLbPPLykc
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Damn. Southern storm has a funnel halfway to the ground.
Member Since: July 22, 2010 Posts: 1 Comments: 3841
Quoting Ameister12:
Oh man!

Could be ef3 tight rotation!
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Member Since: July 6, 2010 Posts: 113 Comments: 31502


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Oh man!
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Still very strong rotation with both Dodge City storms... I've gotta run for a while... Be back in an hour and a half or so... Make sure the storms save some excitement for when I get back!
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Quoting MAweatherboy1:

Tornado warnings are also issued when a tornado is indicated by radar though


Which is why he said systems
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Quoting Thundercloud01221991:


not all tornado warnings have a visual tornado ... if radar indicates tornado then a warning is issued


He said computer system (radar)
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Quoting CybrTeddy:
Anyone have a live streaming news network out of the high risk zone to watch? I've got the storm chaser webcams.


Link

Link
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Quoting aspectre:
999 MAweatherboy1: Does anyone else think the big storm in Northeast Nebraska with the TVS should have a tornado warning?

Tornado warnings are issued when a tornado has been visually*spotted.
Systems with an extremely high probability of generating (or having) a tornado embedded within them are flagged with a tornado watch.

* Though local weathermen tend to call them when a tornado debris ball shows up on the radar, and the NWS has shown an increasing tendency to do so.

Tornado warnings are also issued when a tornado is indicated by radar though
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Chaser feed. Link
Member Since: July 22, 2010 Posts: 1 Comments: 3841
Quoting nigel20:
Good afternoon all!
What did I miss?


Quite a bit, tornadoes in kansas
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Quoting aspectre:
999 MAweatherboy1: Does anyone else think the big storm in Northeast Nebraska with the TVS should have a tornado warning?

Tornado warnings are issued when a tornado has been visually*spotted.
Systems with an extremely high probability of generating (or having) a tornado embedded within them are flagged with a tornado watch.

* Though local weathermen tend to call them when a tornado debris ball shows up on the radar, and the NWS has shown an increasing tendency to do so.


not all tornado warnings have a visual tornado ... if radar indicates tornado then a warning is issued
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999
WFUS53 KGID 141925
TORGID
NEC129-169-142000-
/O.NEW.KGID.TO.W.0010.120414T1925Z-120414T2000Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE HASTINGS NE
225 PM CDT SAT APR 14 2012

THE NATIONAL WEATHER SERVICE IN HASTINGS HAS ISSUED A

* TORNADO WARNING FOR...
EAST CENTRAL NUCKOLLS COUNTY IN SOUTH CENTRAL NEBRASKA...
THAYER COUNTY IN SOUTH CENTRAL NEBRASKA...

* UNTIL 300 PM CDT

* AT 224 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
STORM WAS LOCATED NEAR DESHLER...OR 38 MILES NORTH OF CONCORDIA...
AND MOVING EAST AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
DESHLER...HEBRON...BELVIDERE...GILEAD AND ALEXANDRIA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS TORNADO WARNING REPLACES THE SEVERE THUNDERSTORM WARNING THAT
WAS IN EFFECT FOR THE SAME AREA.

&&

LAT...LON 4000 9780 4017 9788 4033 9737 4031 9736
4010 9736
TIME...MOT...LOC 1926Z 250DEG 27KT 4012 9773
HAIL 1.00IN

$$
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999 MAweatherboy1: Does anyone else think the big storm in Northeast Nebraska with the TVS should have a tornado warning?

Tornado warnings are issued when a tornado has been visually*spotted.
Systems with an extremely high probability of generating (or having) a tornado embedded within them are flagged with a tornado watch.

* Though local weathermen tend to call them when a tornado debris ball shows up on the radar.
And the NWS has shown an ever increasing tendency to say something like "A debris ball has been spotted on radar. There is probably a tornado nearby."
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1063. nigel20
Good afternoon all!
What did I miss?
Member Since: November 6, 2010 Posts: 11 Comments: 7870
Quoting TropicalAnalystwx13:
Two beautiful tornadic supercells.



Bucklin better watch out!!
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These Kansas storms are crazy! They could produce some strong tornadoes.
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BTW they extended the PDS watch farther south to include the rest of Western OK.


Member Since: October 17, 2010 Posts: 0 Comments: 1267
Anyone have a live streaming news network out of the high risk zone to watch? I've got the storm chaser webcams.
Member Since: July 8, 2005 Posts: 259 Comments: 23590
Iowa storm looks weaker in new frame
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FLOOD ADVISORY
NATIONAL WEATHER SERVICE SAN JUAN PR
319 PM AST SAT APR 14 2012

PRC001-081-083-141-142215-
/O.NEW.TJSJ.FA.Y.0125.120414T1919Z-120414T2215Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000 Z.OO/
LARES PR-UTUADO PR-ADJUNTAS PR-LAS MARIAS PR-
319 PM AST SAT APR 14 2012

THE NATIONAL WEATHER SERVICE IN SAN JUAN HAS ISSUED AN

* URBAN AND SMALL STREAM FLOOD ADVISORY FOR RAPID RIVER RISES IN
FOR THE FOLLOWING MUNICIPALITIES...

IN PUERTO RICO
LARES...UTUADO...ADJUNTAS AND LAS MARIAS

* UNTIL 615 PM AST

* AT 315 PM AST...DOPPLER RADAR INDICATED VERY HEAVY RAIN IN THE
ADVISORY AREA. RAINFALL AMOUNTS BETWEEN 1 AND 2 INCHES HAVE
FALLEN IN THE SOME AREAS AND ADDITIONAL 1 TO 2 INCHES ARE POSSIBLE
THROUGH 615 PM AST. IN ADDITION...QUICK RISES ALONG RIO GUAJATACA IN
LARES HAS BEEN OBSERVED IN THE LAST HOUR. ANY ADDITIONAL RAIN WILL
RESULT IN URBAN FLOODING AS WELL AS QUICK RIVER RISES IN THE
ADVISORY AREA.

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN. MOVE TO
HIGHER GROUND.

&&

LAT...LON 1827 6703 1825 6691 1834 6688 1832 6682
1832 6662 1817 6667 1822 6701

$$

ER
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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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