Mesoscale Discussion 504

Issued

Apr 29, 2016, 5:42 PM CDT (22:42 UTC)

Expired

Apr 29, 2016, 7:15 PM CDT

In force

93 min

Issued by

the Storm Prediction Center

The Shreveport radar (KSHV), 32 km from the middle of the area, began a volume at 22:44 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.

462 
ACUS11 KWNS 292242
SWOMCD
SPC MCD 292242 
ARZ000-LAZ000-TXZ000-OKZ000-300015-

MESOSCALE DISCUSSION 0504
NWS STORM PREDICTION CENTER NORMAN OK
0542 PM CDT FRI APR 29 2016

AREAS AFFECTED...PORTIONS OF EASTERN TX AND NORTHWESTERN LA

CONCERNING...TORNADO WATCH 125...

VALID 292242Z - 300015Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 125 CONTINUES.

SUMMARY...THE THREAT FOR A FEW TORNADOES...LARGE HAIL...AND STRONG
WINDS CONTINUES IN WATCH 125...ESPECIALLY ACROSS SOUTHWESTERN
SECTIONS OF THE WATCH.

DISCUSSION...WHILE THE REGIONAL RADAR MOSAIC INDICATES A LARGE AREA
OF STRATIFORM RAIN ACROSS MUCH OF WATCH 125...SOUTHWESTERN PORTIONS
OF THE WATCH HAVE REMAINED RELATIVELY FREE OF PRECIPITATION. AS
SUCH...AMPLE BUOYANCY AND CONSIDERABLE DEEP-LAYER SHEAR /AS WELL AS
LOW-LEVEL VEERING WITH HEIGHT/ ARE PROVIDING AN ENVIRONMENT
FAVORABLE FOR ALL SEVERE HAZARDS. CONTINUED WARM-AIR ADVECTION HAS
ENCOURAGED THE DEVELOPMENT OF A LARGE HP SUPERCELL OVER PORTIONS OF
SOUTHEASTERN VAN ZANDT COUNTY...EMBEDDED IN A LARGER CLUSTER.
POLARIMETRIC DATA...MRMS MESH...AND OVERALL REFLECTIVITY STRUCTURE
SUGGEST GIANT HAIL /I.E. AT LEAST 2-INCH DIAMETER/ LIKELY OCCURRED
WITHIN THE LAST 30-45 MINUTES. WHILE THE CELL HAS SINCE WEAKENED
SOME...A SEVERE THREAT WILL CONTINUE ACROSS SOUTHWESTERN PORTIONS OF
WATCH 125 THIS EVENING...AS FURTHER MID/LOW-LEVEL ROTATION IS LIKELY
WITH MORE DISCRETE CELLS.

ACROSS THE REMAINDER OF THE WATCH...WHILE THE LOW-LEVEL ENVIRONMENT
IS LIKELY SOMEWHAT MORE STABLE...A NORTHWARD-PROGRESSING BOUNDARY
NEAR THE RED RIVER MAY CONTINUE TO FOCUS ROTATION IN ANY
SURFACE-BASED PARCELS...ENCOURAGING A CONTINUED TORNADO THREAT HERE.

..PICCA.. 04/29/2016

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

ATTN...WFO...JAN...LZK...SHV...TSA...FWD...

LAT...LON   31579474 31699533 32629566 34399504 34409363 34039169
            32719189 32349221 32029397 31579474

Mesoscale Discussions in Arkansas, 2016Mesoscale Discussions in Texas, 2016Mesoscale Discussions in Louisiana, 2016Every mesoscale discussion in 2016

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.