Severe Thunderstorm Watch 189

Issued

May 18, 2021, 3:51 PM CDT (20:51 UTC)

Expired

May 18, 2021, 9:00 PM CDT

In force

5 hr

Issued by

the Storm Prediction Center

Largest hail expected

1.5 in

Strongest gust expected

60 kt

The Western Arkansas radar (KSRX), 155 km from the middle of the area, began a volume at 20:52 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

50%

One or more gusts of 65 knots or more

10%

Ten or more severe hail reports

20%

One or more hailstones of 2 inches or more

5%

Six or more combined severe hail and wind reports

80%

• Mesoscale Discussion 673 Severe potential...watch possibleMay 18, 2:30 PM CDT
• Mesoscale Discussion 677 Severe thunderstorm watch 189May 18, 5:39 PM CDT
• Mesoscale Discussion 680 Severe thunderstorm watch 189May 18, 8:00 PM CDT

777 
WWUS20 KWNS 182048
SEL9  
SPC WW 182048
ARZ000-OKZ000-TXZ000-190200-

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 189
NWS Storm Prediction Center Norman OK
350 PM CDT Tue May 18 2021

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  Western Arkansas
  Southeast Oklahoma
  Northeast Texas

* Effective this Tuesday afternoon and evening from 350 PM until
  900 PM CDT.

* Primary threats include...
  Scattered damaging wind gusts to 70 mph possible
  Isolated large hail events to 1.5 inches in diameter possible
  A tornado or two possible

SUMMARY...A relatively well-organized cluster of storms will
progress east-northeastward across the region, with damaging winds
as the primary hazard. Additional/regenerative storm development may
occur by early evening across northeast Texas with additional severe
storms across the region.

The severe thunderstorm watch area is approximately along and 50
statute miles east and west of a line from 45 miles east northeast
of Poteau OK to 30 miles south of Longview TX. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU9).

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.

&&

OTHER WATCH INFORMATION...CONTINUE...WW 188...

AVIATION...A few severe thunderstorms with hail surface and aloft to
1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 450. Mean storm motion vector
23025.

...Guyer

Severe Thunderstorm Watches in Arkansas, 2021Severe Thunderstorm Watches in Texas, 2021Severe Thunderstorm Watches in Oklahoma, 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.