Severe Thunderstorm Watch 381

Issued

Jul 16, 2021, 3:55 PM MDT (21:55 UTC)

Expired

Jul 16, 2021, 11:00 PM MDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Rapid City radar (KUDX), 153 km from the middle of the area, began a volume at 21:55 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

40%

One or more gusts of 65 knots or more

20%

Ten or more severe hail reports

40%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

70%

• Mesoscale Discussion 1299 Severe potential...watch possibleJul 16, 2:16 PM MDT
• Mesoscale Discussion 1301 Severe thunderstorm watch 381Jul 16, 6:16 PM MDT
• Mesoscale Discussion 1302 Severe thunderstorm watch 381Jul 16, 9:17 PM MDT

894 
WWUS20 KWNS 162150
SEL1  
SPC WW 162150
COZ000-NEZ000-SDZ000-170500-

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 381
NWS Storm Prediction Center Norman OK
350 PM MDT Fri Jul 16 2021

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  Northeast Colorado
  Western Nebraska
  Southwest South Dakota

* Effective this Friday afternoon and evening from 350 PM until
  1100 PM MDT.

* Primary threats include...
  Scattered large hail and isolated very large hail events to 2
    inches in diameter possible
  Scattered damaging wind gusts to 70 mph possible

SUMMARY...Initially isolated severe thunderstorms are expected to
develop across the Black Hills vicinity of South Dakota in addition
to other areas farther south across far western Nebraska/Nebraska
Panhandle into northeast Colorado through early evening. Over time,
storms may tend to cluster with an increasing damaging wind
potential as they move east-southeastward this evening.

The severe thunderstorm watch area is approximately along and 75
statute miles east and west of a line from 45 miles northeast of
Rapid City SD to 60 miles southeast of Sidney NE. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU1).

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 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
30020.

...Guyer

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