Mesoscale Discussion 784

Issued

May 11, 2012, 1:40 AM CDT (06:40 UTC)

Expired

May 11, 2012, 2:45 AM CDT

In force

65 min

Issued by

the Storm Prediction Center

The Corpus Christi radar (KCRP), 97 km from the middle of the area, began a volume at 06:43 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

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683 
ACUS11 KWNS 110640
SWOMCD
SPC MCD 110640 
TXZ000-110745-

MESOSCALE DISCUSSION 0784
NWS STORM PREDICTION CENTER NORMAN OK
0140 AM CDT FRI MAY 11 2012

AREAS AFFECTED...S TX THROUGH THE UPPER TX COAST

CONCERNING...TORNADO WATCH 273...

VALID 110640Z - 110745Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 273 CONTINUES.

SUMMARY...SEVERE WEATHER THREAT CONTINUES ACROSS WW 273...ESPECIALLY
FOR DAMAGING WINDS AND A TORNADO THREAT ACROSS DEEP S TX AND
SPREADING ACROSS THE UPPER TX COASTAL AREAS.  COUNTIES INCLUDING THE
HOUSTON METRO AREA HAVE BEEN ADDED TO THIS TORNADO WATCH...PER
COORDINATION WITH WFO HOUSTON.

DISCUSSION...AT 0625Z...REGIONAL RADAR IMAGERY SHOWED TWO PRIMARY
FOCUS AREAS FOR A CONTINUED SEVERE WEATHER THREAT WITHIN WW 273. 
THE FIRST AREA INCLUDES THE HOUSTON METRO AREA AS A BOWING LINE OF
STORMS EXTENDING FROM MATAGORDA TO BRAZORIA COUNTIES...AND THEN
ARCING SSEWD OFFSHORE.  THIS LINE WAS MOVING NEWD AT 38 KT AND
SHOULD REACH GLS BY 07-0730Z.  MEANWHILE...THE SECOND AREA OF
CONCERN WAS LOCATED OVER DEEP S TX...ALONG AND AHEAD OF A BAND OF
STRONG-SVR STORMS EXTENDING FROM BROOKS TO ERN STARR COUNTIES.  THIS
ACTIVITY SHOULD REACH THE S TX COAST BETWEEN 08-10Z.

OBJECTIVE ANALYSES INDICATED THE ENVIRONMENT ACROSS THE UPPER TX
COASTAL AREA AND IN DEEP S TX EACH REMAINED MODERATELY UNSTABLE...
WITH MLCAPE VALUES OF 1000-1500 J/KG AND 2000-2500 J/KG...
RESPECTIVELY.  THIS IN ADDITION TO BULK SHEAR OF 40-50 KT AND
EFFECTIVE SRH OF 200-300 M2/S2 ARE MORE THAN SUFFICIENT TO MAINTAIN
ONGOING STORM ORGANIZATION WITH ATTENDANT THREAT OF TORNADOES AND
DAMAGING WINDS.

..PETERS.. 05/11/2012

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...LCH...HGX...CRP...EWX...BRO...

LAT...LON   25899699 25819753 26049811 26279891 26509919 26839932
            27609954 28149843 28769751 29299659 29949660 30669652
            30339607 29949606 30129588 30059532 30159502 29859492
            29889437 29249418 28779484 28369553 27939600 27059700
            26619714 25899699

Mesoscale Discussions in Texas, 2012Every mesoscale discussion in 2012

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.