Mesoscale Discussion 129

Issued

Feb 24, 2011, 5:26 PM CST (23:26 UTC)

Expired

Feb 24, 2011, 7:00 PM CST

In force

94 min

Issued by

the Storm Prediction Center

The Little Rock radar (KLZK), 155 km from the middle of the area, began a volume at 23:29 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

• Tornado Watch 16Feb 24, 7:45 PM CST
• Tornado Watch 17Feb 24, 8:30 PM CST

318 
ACUS11 KWNS 242326
SWOMCD
SPC MCD 242326 
TNZ000-KYZ000-ALZ000-MSZ000-ILZ000-MOZ000-ARZ000-LAZ000-TXZ000-250100-

MESOSCALE DISCUSSION 0129
NWS STORM PREDICTION CENTER NORMAN OK
0526 PM CST THU FEB 24 2011

AREAS AFFECTED...ERN/SRN AR...NRN LA...NW MS...WRN TN...SW KY

CONCERNING...TORNADO WATCH 13...14...

VALID 242326Z - 250100Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 13...14...CONTINUES.

A THREAT FOR TORNADOES...WIND DAMAGE AND HAIL WILL CONTINUE TO MOVE
EWD ACROSS WW 13 REACHING WRN PORTIONS OF WW 14 THIS EVENING. THE
SEVERE THREAT SHOULD EXPAND NEWD WITH TIME AND A NEW TORNADO WATCH
HAS BEEN ISSUED IN PARTS OF FAR SE MO AND SW KY TO ACCOUNT FOR THIS
THREAT.

A SQUALL-LINE ABOUT 500 STATUTE MILES IN LENGTH IS ONGOING ACROSS
ERN AR AND NW LA ASSOCIATED WITH VERY STRONG LARGE-SCALE ASCENT
AHEAD OF AN APPROACHING SRN PLAINS UPPER-LEVEL TROUGH. THE NRN END
OF THE LINE IS LOCATED NEAR A WARM FRONT THAT EXTENDS ENEWD FROM NE
AR INTO WRN TN AND SRN KY. LOW-LEVEL SHEAR IS ENHANCED ALONG THE
BOUNDARY WITH THE MEMPHIS WSR-88D VWP SHOWING ABOUT 30 KT OF 0-1 KM
SHEAR. IN ADDITION TO THE SHEAR...LCL HEIGHTS FROM THE BOUNDARY NWD
ARE ESTIMATED AROUND 750 METERS. THESE TWO FACTORS SHOULD BE
FAVORABLE FOR ISOLATED TORNADO DEVELOPMENT WITH EMBEDDED BOWING LINE
SEGMENTS. THIS TORNADO THREAT SHOULD MOVE NEWD WITH TIME REACHING SW
KY EARLY THIS EVENING. CELLS THAT DEVELOP AHEAD OF THE LINE MAY ALSO
HAVE A TORNADO THREAT. DAMAGING WIND GUSTS WILL BE COMMON ALONG THE
ENTIRE LENGTH OF THE LINE DUE TO A FORWARD SPEED OF THE LINE AROUND
40 KT AND DUE TO THE VERY STRONG FLOW JUST ABOVE THE SURFACE. THE
WIND DAMAGE THREAT SHOULD MOVE INTO WRN TN...NW MS AND NERN LA IN
THE 00Z TO 01Z TIMEFRAME.

..BROYLES.. 02/24/2011

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

ATTN...WFO...LMK...OHX...BMX...HUN...PAH...MEG...JAN...LZK...
SHV...

LAT...LON   31919249 31649360 31629436 31809484 32189488 32819457
            34509336 35799186 36439097 37098927 37158757 36798672
            35818676 34968703 34318741 33498833 32629019 32179162
            31919249

Mesoscale Discussions in Arkansas, 2011Mesoscale Discussions in Mississippi, 2011Mesoscale Discussions in Tennessee, 2011Every mesoscale discussion in 2011

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.