Severe Thunderstorm Watch 356

Issued

Jul 9, 2021, 2:16 PM MDT (20:16 UTC)

Expired

Jul 9, 2021, 11:00 PM MDT

In force

9 hr

Issued by

the Storm Prediction Center

Largest hail expected

3 in

Strongest gust expected

65 kt

The Cheyenne radar (KCYS), 176 km from the middle of the area, began a volume at 20:15 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

2%

Ten or more severe wind reports

40%

One or more gusts of 65 knots or more

40%

Ten or more severe hail reports

50%

One or more hailstones of 2 inches or more

50%

Six or more combined severe hail and wind reports

80%

• Mesoscale Discussion 1213 Severe potential...watch likelyJul 9, 1:38 PM MDT
• Mesoscale Discussion 1218 Severe thunderstorm watch 356Jul 9, 5:16 PM MDT
• Mesoscale Discussion 1220 Severe thunderstorm watch 356Jul 9, 7:21 PM MDT
• Mesoscale Discussion 1221 Severe thunderstorm watch 356Jul 9, 7:49 PM MDT
• Mesoscale Discussion 1225 Severe thunderstorm watch 361Jul 9, 9:44 PM MDT

945 
WWUS20 KWNS 092012
SEL6  
SPC WW 092012
COZ000-KSZ000-NEZ000-WYZ000-100300-

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 356
NWS Storm Prediction Center Norman OK
310 PM CDT Fri Jul 9 2021

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  Northeast Colorado
  Northwest Kansas
  Western and central Nebraska
  Southeast Wyoming

* Effective this Friday afternoon and evening from 310 PM until
  1000 PM CDT.

* Primary threats include...
  Scattered damaging winds and isolated significant gusts to 75
    mph possible
  Scattered large hail and isolated very large hail events to 3
    inches in diameter possible
  A tornado or two possible

SUMMARY...Severe thunderstorms will develop this afternoon and pose
a risk for potentially very large hail and damaging winds.  Storms
should evolve into a line by this evening with an increasing risk
for damaging winds, potentially significant.  A tornado or two is
also possible.

The severe thunderstorm watch area is approximately along and 95
statute miles north and south of a line from 30 miles north
northwest of Cheyenne WY to 20 miles south southeast of Broken Bow
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.

&&

AVIATION...A few severe thunderstorms with hail surface and aloft to
3 inches. Extreme turbulence and surface wind gusts to 65 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
28030.

...Bunting

Severe Thunderstorm Watches in Nebraska, 2021Severe Thunderstorm Watches in Colorado, 2021Severe Thunderstorm Watches in Wyoming, 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.