Severe Thunderstorm Watch 157

Issued

May 9, 2021, 1:14 PM CDT (18:14 UTC)

Expired

May 9, 2021, 9:00 PM CDT

In force

8 hr

Issued by

the Storm Prediction Center

Largest hail expected

2.5 in

Strongest gust expected

60 kt

The Shreveport radar (KSHV), 98 km from the middle of the area, began a volume at 18:18 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.

Two or more tornadoes

20%

One or more EF2 to EF5 tornadoes

5%

Ten or more severe wind reports

60%

One or more gusts of 65 knots or more

20%

Ten or more severe hail reports

70%

One or more hailstones of 2 inches or more

60%

Six or more combined severe hail and wind reports

95%

• Mesoscale Discussion 568 Severe potential...watch likelyMay 9, 12:14 PM CDT
• Mesoscale Discussion 572 Severe thunderstorm watch 157...158May 9, 3:42 PM CDT
• Mesoscale Discussion 574 Severe thunderstorm watch 157May 9, 5:41 PM CDT

669 
WWUS20 KWNS 091813
SEL7  
SPC WW 091813
ARZ000-LAZ000-MSZ000-TXZ000-100200-

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 157
NWS Storm Prediction Center Norman OK
115 PM CDT Sun May 9 2021

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  Much of central and southern Arkansas
  Northern Louisiana
  West central Mississippi
  Northeast Texas

* Effective this Sunday afternoon and evening from 115 PM until
  900 PM CDT.

* Primary threats include...
  Scattered large hail and isolated very large hail events to 2.5
    inches in diameter likely
  Scattered damaging wind gusts to 70 mph likely
  A tornado or two possible

SUMMARY...Scattered severe thunderstorms are expected to form this
afternoon along and ahead of a cold front central Arkansas
southwestward into northeast Texas, as well as from northern
Louisiana into west central Mississippi.  The storm environment will
favor a mix of supercells and organized clusters capable of
producing isolated very large hail and damaging winds through this
evening.  A tornado or two cannot be ruled out with the more
intense/persistent supercells.

The severe thunderstorm watch area is approximately along and 80
statute miles north and south of a line from 40 miles west southwest
of Longview TX to 55 miles east northeast of Pine Bluff AR. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU7).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A Severe Thunderstorm Watch means conditions are
favorable for severe thunderstorms in and close to the watch area.
Persons in these areas should be on the lookout for threatening
weather conditions and listen for later statements and possible
warnings. Severe thunderstorms can and occasionally do produce
tornadoes.

&&

AVIATION...A few severe thunderstorms with hail surface and aloft to
2.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 550. Mean storm motion vector
28025.

...Thompson

Severe Thunderstorm Watches in Arkansas, 2021Severe Thunderstorm Watches in Texas, 2021Severe Thunderstorm Watches in Louisiana, 2021Every severe thunderstorm watch 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.