Severe Thunderstorm Watch 499

Issued

Sep 14, 2021, 1:55 PM MDT (19:55 UTC)

Expired

Sep 14, 2021, 9:00 PM MDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

Counties Baca County, CO, Bent County, CO, Cheyenne County, CO, Crowley County, CO, El Paso County, CO, Elbert County, CO, Fremont County, CO, Huerfano County, CO, Kiowa County, CO, Kit Carson County, CO, Las Animas County, CO, Lincoln County, CO, Otero County, CO, Prowers County, CO, Pueblo County, CO, Teller County, CO

Two or more tornadoes

5%

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 1745 Severe potential...watch possibleSep 14, 1:08 PM MDT
• Mesoscale Discussion 1749 Severe thunderstorm watch 499Sep 14, 5:30 PM MDT

280 
WWUS20 KWNS 141952
SEL9  
SPC WW 141952
COZ000-150300-

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 499
NWS Storm Prediction Center Norman OK
155 PM MDT Tue Sep 14 2021

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  East central and southeast Colorado

* Effective this Tuesday afternoon and evening from 155 PM until
  900 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...Widely scattered storms are expected to move off the
higher terrain and intensify this afternoon through this evening. 
The initial storms will likely be splitting supercells capable of
producing large hail of 1.5 to 2 inch diameter.  Later this evening,
some upscale growth is possible into a cluster or two, with an
attendant threat for occasional severe outflow gusts as the storms
spread into southeast Colorado.

The severe thunderstorm watch area is approximately along and 70
statute miles east and west of a line from 20 miles northeast of
Limon CO to 45 miles west southwest of Springfield CO. 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 498...

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
32020.

...Thompson

Severe 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.