Mesoscale Discussion 326

Issued

Apr 7, 2021, 3:40 PM CDT (20:40 UTC)

Expired

Apr 7, 2021, 4:45 PM CDT

In force

65 min

Issued by

the Storm Prediction Center

Concerning

Tornado watch 75

The Shreveport radar (KSHV), 146 km from the middle of the area, began a volume at 20:41 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.

466 
ACUS11 KWNS 072041
SWOMCD
SPC MCD 072040 
ARZ000-MOZ000-LAZ000-TXZ000-OKZ000-072145-

Mesoscale Discussion 0326
NWS Storm Prediction Center Norman OK
0340 PM CDT Wed Apr 07 2021

Areas affected...much of Arkansas...northeastern Texas...and
northern Louisiana

Concerning...Tornado Watch 75...

Valid 072040Z - 072145Z

The severe weather threat for Tornado Watch 75 continues.

SUMMARY...The severe risk continues along and ahead of a front
across western Arkansas and northeastern Texas.  So far, storms have
a history of hail and a few wind gusts, but tornadoes remain
possible through the evening.

DISCUSSION...The severe risk continues across WW 75.  Cells along
and ahead of the cold front (now from near HRO to DEQ to 25 NW CLL)
have occasionally produced hail and exhibited rotation, which isn't
surprising given the 7-7.5 C/km mid-level lapse rates and favorable
shear profiles in place.  In the near term, it appears that the
greatest severe risk (including 1"+ hail stones and perhaps a
tornado or damaging wind gusts) will exist with cells that can
acquire rotation either along the front or with isolated cells ahead
of the front.  Cells over central Arkansas are migrating eastward
toward areas that received sunshine earlier, and an uptick in severe
risk may occur there through the afternoon, especially as low-level
flow increases over the next 2-3 hours.  Ascent from an approaching
vorticity maximum near Tulsa, OK should also sustain the current
severe risk over Arkansas during that timeframe.

..Cook/Hart.. 04/07/2021

...Please see www.spc.noaa.gov for graphic product...

ATTN...WFO...PAH...MEG...JAN...LZK...SGF...LCH...SHV...TSA...
HGX...FWD...

LAT...LON   36539365 36689257 36589104 36169072 34769096 33649133
            32199184 31369201 31159284 31009434 31099523 31369577
            31919569 32659524 33429470 34369426 35169411 36539365

Mesoscale Discussions in Arkansas, 2021Mesoscale Discussions in Texas, 2021Mesoscale Discussions in Louisiana, 2021Every mesoscale discussion in 2021

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.