Severe Thunderstorm Watch 376

Issued

Jul 13, 2021, 4:25 PM MDT (22:25 UTC)

Expired

Jul 14, 2021, 12:00 AM MDT

In force

8 hr

Issued by

the Storm Prediction Center

Largest hail expected

1.5 in

Strongest gust expected

60 kt

The Rapid City radar (KUDX), 180 km from the middle of the area, began a volume at 22:27 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

10%

One or more EF2 to EF5 tornadoes

2%

Ten or more severe wind reports

50%

One or more gusts of 65 knots or more

20%

Ten or more severe hail reports

30%

One or more hailstones of 2 inches or more

10%

Six or more combined severe hail and wind reports

70%

• Mesoscale Discussion 1270 Severe potential...watch unlikelyJul 13, 1:38 PM MDT
• Mesoscale Discussion 1272 Severe potential...severe thunderstorm watch likelyJul 13, 2:21 PM MDT
• Mesoscale Discussion 1277 Severe thunderstorm watch 376Jul 13, 7:35 PM MDT
• Mesoscale Discussion 1278 Severe thunderstorm watch 376Jul 13, 10:30 PM MDT

181 
WWUS20 KWNS 132222
SEL6  
SPC WW 132222
MTZ000-NEZ000-SDZ000-WYZ000-140500-

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 376
NWS Storm Prediction Center Norman OK
425 PM MDT Tue Jul 13 2021

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  Extreme southeast Montana
  The Nebraska Panhandle
  West central and southwest South Dakota
  Northeast and east central Wyoming

* Effective this Tuesday afternoon and evening from 425 PM until
  1100 PM MDT.

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

SUMMARY...Clusters of storms, including some supercells, are
expected to form this afternoon and spread east-southeastward
through late evening.  The primary threats are expected to be
outflow gusts up to 70 mph and isolated large hail near 1.5 inches
in diameter.

The severe thunderstorm watch area is approximately along and 80
statute miles north and south of a line from 50 miles west southwest
of Gillette WY to 20 miles southeast of Chadron NE. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU6).

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 375...

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 500. Mean storm motion vector
28025.

...Thompson

Severe Thunderstorm Watches in Wyoming, 2021Severe Thunderstorm Watches in South Dakota, 2021Severe Thunderstorm Watches in Nebraska, 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.