Severe Thunderstorm Watch 310

Issued

Jul 26, 2018, 1:49 PM MDT (19:49 UTC)

Expired

Jul 26, 2018, 9:00 PM MDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Cheyenne radar (KCYS), 102 km from the middle of the area, began a volume at 19:53 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

20%

Ten or more severe hail reports

60%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

90%

• Mesoscale Discussion 1165Jul 26, 12:49 PM MDT
• Mesoscale Discussion 1169Jul 26, 6:07 PM MDT

568 
WWUS20 KWNS 261948
SEL0  
SPC WW 261948
COZ000-NEZ000-WYZ000-270300-

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 310
NWS Storm Prediction Center Norman OK
150 PM MDT Thu Jul 26 2018

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  Northeast Colorado
  Western Nebraska
  Southeast Wyoming

* Effective this Thursday afternoon and evening from 150 PM until
  900 PM MDT.

* Primary threats include...
  Scattered large hail likely with isolated very large hail events
    to 2 inches in diameter possible
  Scattered damaging wind gusts to 70 mph possible
  A tornado or two possible

SUMMARY...Thunderstorms will continue to increase in coverage and
intensity through the afternoon across the watch area, posing a risk
of large hail and locally damaging wind gusts.  An isolated tornado
cannot be ruled out.

The severe thunderstorm watch area is approximately along and 60
statute miles east and west of a line from 55 miles north of
Torrington WY to 45 miles south southeast of Limon CO. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU0).

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
30030.

...Hart

Severe Thunderstorm Watches in Colorado, 2018Severe Thunderstorm Watches in Nebraska, 2018Severe Thunderstorm Watches in Wyoming, 2018Every severe thunderstorm watch in 2018

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.