Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for
Watch Status Reports.
SEL9
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 639
NWS Storm Prediction Center Norman OK
145 PM MDT Mon Aug 19 2024
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Eastern Colorado
Nebraska Panhandle
Southeast Wyoming
* Effective this Monday afternoon and evening from 145 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...Thunderstorms are expected to build eastward off the
foothills of this afternoon, spreading across the watch area. The
strongest storms will pose a risk of large hail and locally damaging
wind gusts.
The severe thunderstorm watch area is approximately along and 35
statute miles east and west of a line from 25 miles southeast of
Pueblo CO to 20 miles northwest of Chadron NE. 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.
&&
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
24025.
...Hart
SEL9
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 639
NWS Storm Prediction Center Norman OK
145 PM MDT Mon Aug 19 2024
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Eastern Colorado
Nebraska Panhandle
Southeast Wyoming
* Effective this Monday afternoon and evening from 145 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...Thunderstorms are expected to build eastward off the
foothills of this afternoon, spreading across the watch area. The
strongest storms will pose a risk of large hail and locally damaging
wind gusts.
The severe thunderstorm watch area is approximately along and 35
statute miles east and west of a line from 25 miles southeast of
Pueblo CO to 20 miles northwest of Chadron NE. 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.
&&
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
24025.
...Hart
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW9
WW 639 SEVERE TSTM CO NE WY 191945Z - 200300Z
AXIS..35 STATUTE MILES EAST AND WEST OF LINE..
25SE PUB/PUEBLO CO/ - 20NW CDR/CHADRON NE/
..AVIATION COORDS.. 30NM E/W /20SE PUB - 59SSW RAP/
HAIL SURFACE AND ALOFT..2 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 24025.
LAT...LON 38020482 43030407 43030269 38020353
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU9.
Watch 639 Status Report Messages:
STATUS REPORT #4 ON WW 639
VALID 200210Z - 200340Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 15 NE DEN TO
35 WNW AKO TO 30 NNE AKO TO 40 ENE SNY AND 30 WSW PUB TO 35 SSE
ITR TO 45 NNW GLD TO 30 W AKO.
..HALBERT..08/20/24
ATTN...WFO...GLD...PUB...BOU...CYS...
&&
STATUS REPORT FOR WS 639
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
COC025-061-089-101-121-200340-
CO
. COLORADO COUNTIES INCLUDED ARE
CROWLEY KIOWA OTERO
PUEBLO WASHINGTON
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #3 ON WW 639
VALID 200115Z - 200240Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 15 NE DEN TO
35 WNW AKO TO 30 NNE AKO TO 40 ENE SNY.
..HALBERT..08/20/24
ATTN...WFO...GLD...PUB...BOU...CYS...
&&
STATUS REPORT FOR WS 639
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
COC017-025-039-041-061-063-073-087-089-101-121-125-200240-
CO
. COLORADO COUNTIES INCLUDED ARE
CHEYENNE CROWLEY ELBERT
EL PASO KIOWA KIT CARSON
LINCOLN MORGAN OTERO
PUEBLO WASHINGTON YUMA
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #2 ON WW 639
VALID 200010Z - 200140Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 SSW CYS
TO 35 ENE SNY.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1961
..HALBERT..08/20/24
ATTN...WFO...GLD...PUB...BOU...CYS...
&&
STATUS REPORT FOR WS 639
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
COC017-025-039-041-061-063-073-075-087-089-101-121-123-125-
200140-
CO
. COLORADO COUNTIES INCLUDED ARE
CHEYENNE CROWLEY ELBERT
EL PASO KIOWA KIT CARSON
LINCOLN LOGAN MORGAN
OTERO PUEBLO WASHINGTON
WELD YUMA
$$
NEC033-200140-
NE
. NEBRASKA COUNTIES INCLUDED ARE
CHEYENNE
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #1 ON WW 639
VALID 192305Z - 200040Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..HALBERT..08/19/24
ATTN...WFO...GLD...PUB...BOU...CYS...
&&
STATUS REPORT FOR WS 639
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
COC017-025-039-041-061-063-073-075-087-089-101-121-123-125-
200040-
CO
. COLORADO COUNTIES INCLUDED ARE
CHEYENNE CROWLEY ELBERT
EL PASO KIOWA KIT CARSON
LINCOLN LOGAN MORGAN
OTERO PUEBLO WASHINGTON
WELD YUMA
$$
NEC007-013-033-045-105-123-157-165-200040-
NE
. NEBRASKA COUNTIES INCLUDED ARE
BANNER BOX BUTTE CHEYENNE
DAWES KIMBALL MORRILL
SCOTTS BLUFF SIOUX
$$
WYC015-021-200040-
WY
. WYOMING COUNTIES INCLUDED ARE
GOSHEN LARAMIE
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
Note:
Click for Complete Product Text.
Tornadoes
Probability of 2 or more tornadoes
|
Low (<5%)
|
Probability of 1 or more strong (EF2-EF5) tornadoes
|
Low (<2%)
|
Wind
Probability of 10 or more severe wind events
|
Mod (40%)
|
Probability of 1 or more wind events > 65 knots
|
Low (20%)
|
Hail
Probability of 10 or more severe hail events
|
Mod (40%)
|
Probability of 1 or more hailstones > 2 inches
|
Mod (30%)
|
Combined Severe Hail/Wind
Probability of 6 or more combined severe hail/wind events
|
High (70%)
|
For each watch, probabilities for particular events inside the watch
(listed above in each table) are determined by the issuing forecaster.
The "Low" category contains probability values ranging from less than 2%
to 20% (EF2-EF5 tornadoes), less than 5% to 20% (all other probabilities),
"Moderate" from 30% to 60%, and "High" from 70% to greater than 95%.
High values are bolded and lighter in color to provide awareness of
an increased threat for a particular event.
weather.gov 
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