Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for
Watch Status Reports.
SEL6
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 646
NWS Storm Prediction Center Norman OK
120 PM MDT Sun Aug 25 2024
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Western Colorado
Eastern Utah
Southern Wyoming
* Effective this Sunday afternoon and evening from 120 PM until
800 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...Scattered storms, including some supercells, will continue
to develop and increase across the region, with large hail and
severe-caliber wind gusts possible through early/mid-evening.
The severe thunderstorm watch area is approximately along and 80
statute miles east and west of a line from 50 miles north northeast
of Rock Springs WY to 45 miles south southwest of Blanding UT. 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
2 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 450. Mean storm motion vector
23030.
...Guyer
SEL6
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 646
NWS Storm Prediction Center Norman OK
120 PM MDT Sun Aug 25 2024
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Western Colorado
Eastern Utah
Southern Wyoming
* Effective this Sunday afternoon and evening from 120 PM until
800 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...Scattered storms, including some supercells, will continue
to develop and increase across the region, with large hail and
severe-caliber wind gusts possible through early/mid-evening.
The severe thunderstorm watch area is approximately along and 80
statute miles east and west of a line from 50 miles north northeast
of Rock Springs WY to 45 miles south southwest of Blanding UT. 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
2 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 450. Mean storm motion vector
23030.
...Guyer
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW6
WW 646 SEVERE TSTM CO UT WY 251920Z - 260200Z
AXIS..80 STATUTE MILES EAST AND WEST OF LINE..
50NNE RKS/ROCK SPRINGS WY/ - 45SSW 4BL/BLANDING UT/
..AVIATION COORDS.. 70NM E/W /43NNE OCS - 65SW DVC/
HAIL SURFACE AND ALOFT..2 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 450. MEAN STORM MOTION VECTOR 23030.
LAT...LON 42260713 36970834 36971124 42261026
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU6.
Watch 646 Status Report Messages:
STATUS REPORT #5 ON WW 646
VALID 260105Z - 260240Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 40 S 4BL TO
55 NNE GJT TO 15 SSW CAG.
..SPC..08/26/24
ATTN...WFO...GJT...SLC...CYS...RIW...
&&
STATUS REPORT FOR WS 646
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
COC029-033-045-077-083-085-103-107-113-260240-
CO
. COLORADO COUNTIES INCLUDED ARE
DELTA DOLORES GARFIELD
MESA MONTEZUMA MONTROSE
RIO BLANCO ROUTT SAN MIGUEL
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #4 ON WW 646
VALID 252330Z - 260040Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 50 SW 4BL TO
30 W GJT TO 15 SSW CAG.
..SPC..08/25/24
ATTN...WFO...GJT...SLC...CYS...RIW...
&&
STATUS REPORT FOR WS 646
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
COC029-033-045-077-083-085-103-107-113-260040-
CO
. COLORADO COUNTIES INCLUDED ARE
DELTA DOLORES GARFIELD
MESA MONTEZUMA MONTROSE
RIO BLANCO ROUTT SAN MIGUEL
$$
UTC019-037-260040-
UT
. UTAH COUNTIES INCLUDED ARE
GRAND SAN JUAN
$$
WYC007-260040-
WY
. WYOMING COUNTIES INCLUDED ARE
CARBON
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #3 ON WW 646
VALID 252240Z - 252340Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 E PGA TO
30 W GJT TO 50 WSW CAG TO 45 ESE RKS TO 40 S LND.
..SPC..08/25/24
ATTN...WFO...GJT...SLC...CYS...RIW...
&&
STATUS REPORT FOR WS 646
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
COC029-033-045-077-081-083-085-103-107-113-252340-
CO
. COLORADO COUNTIES INCLUDED ARE
DELTA DOLORES GARFIELD
MESA MOFFAT MONTEZUMA
MONTROSE RIO BLANCO ROUTT
SAN MIGUEL
$$
UTC019-037-252340-
UT
. UTAH COUNTIES INCLUDED ARE
GRAND SAN JUAN
$$
WYC007-037-252340-
WY
. WYOMING COUNTIES INCLUDED ARE
CARBON SWEETWATER
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #2 ON WW 646
VALID 252200Z - 252340Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 E PGA TO
30 NNE CNY TO 25 ENE EVW.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1989
..SQUITIERI..08/25/24
ATTN...WFO...GJT...SLC...CYS...RIW...
&&
STATUS REPORT FOR WS 646
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
COC029-033-045-077-081-083-085-103-107-113-252340-
CO
. COLORADO COUNTIES INCLUDED ARE
DELTA DOLORES GARFIELD
MESA MOFFAT MONTEZUMA
MONTROSE RIO BLANCO ROUTT
SAN MIGUEL
$$
UTC009-013-019-037-043-047-252340-
UT
. UTAH COUNTIES INCLUDED ARE
DAGGETT DUCHESNE GRAND
SAN JUAN SUMMIT UINTAH
$$
WYC007-023-037-041-252340-
WY
. WYOMING COUNTIES INCLUDED ARE
CARBON LINCOLN SWEETWATER
UINTA
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #1 ON WW 646
VALID 252045Z - 252140Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..KERR..08/25/24
ATTN...WFO...GJT...SLC...CYS...RIW...
&&
STATUS REPORT FOR WS 646
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
COC029-033-045-077-081-083-085-103-107-113-252140-
CO
. COLORADO COUNTIES INCLUDED ARE
DELTA DOLORES GARFIELD
MESA MOFFAT MONTEZUMA
MONTROSE RIO BLANCO ROUTT
SAN MIGUEL
$$
UTC007-009-013-015-019-037-043-047-055-252140-
UT
. UTAH COUNTIES INCLUDED ARE
CARBON DAGGETT DUCHESNE
EMERY GRAND SAN JUAN
SUMMIT UINTAH WAYNE
$$
WYC007-023-037-041-252140-
WY
. WYOMING COUNTIES INCLUDED ARE
CARBON LINCOLN SWEETWATER
UINTA
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
Note:
Click for Complete Product Text.
Tornadoes
Probability of 2 or more tornadoes
|
Low (10%)
|
Probability of 1 or more strong (EF2-EF5) tornadoes
|
Low (5%)
|
Wind
Probability of 10 or more severe wind events
|
Mod (50%)
|
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 (90%)
|
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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