Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
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Watch Status Reports.
SEL7
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 357
NWS Storm Prediction Center Norman OK
535 PM MDT Fri Jul 9 2021
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Southwest South Dakota
Northeast Wyoming
* Effective this Friday afternoon and evening from 535 PM until
1100 PM MDT.
* Primary threats include...
Scattered damaging wind gusts to 70 mph possible
Scattered large hail events to 1.5 inches in diameter possible
SUMMARY...A small cluster with embedded supercells is expected to
move east-southeastward across northeast Wyoming and southwest South
Dakota this evening through early tonight. The strongest storms
will be capable of producing occasional large hail and damaging
outflow gusts.
The severe thunderstorm watch area is approximately along and 40
statute miles north and south of a line from 25 miles west northwest
of Gillette WY to 40 miles south southeast of Rapid City SD. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU7).
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 356...
AVIATION...A few severe thunderstorms with hail surface and aloft to
1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 450. Mean storm motion vector
30035.
...Thompson
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW7
WW 357 SEVERE TSTM SD WY 092335Z - 100500Z
AXIS..40 STATUTE MILES NORTH AND SOUTH OF LINE..
25WNW GCC/GILLETTE WY/ - 40SSE RAP/RAPID CITY SD/
..AVIATION COORDS.. 35NM N/S /35NNE CZI - 30SSE RAP/
HAIL SURFACE AND ALOFT..1.5 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 450. MEAN STORM MOTION VECTOR 30035.
LAT...LON 45070600 44090274 42940274 43910600
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU7.
Watch 357 Status Report Messages:
STATUS REPORT #3 ON WW 357
VALID 100250Z - 100400Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 45 NW CDR TO
20 ESE RAP.
..SMITH..07/10/21
ATTN...WFO...UNR...
&&
STATUS REPORT FOR WS 357
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
SDC033-047-102-100400-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
CUSTER FALL RIVER OGLALA LAKOTA
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #2 ON WW 357
VALID 100135Z - 100230Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 55 SSE GCC
TO 55 WNW RAP.
..SMITH..07/10/21
ATTN...WFO...UNR...
&&
STATUS REPORT FOR WS 357
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
SDC033-047-081-102-103-100230-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
CUSTER FALL RIVER LAWRENCE
OGLALA LAKOTA PENNINGTON
$$
WYC045-100230-
WY
. WYOMING COUNTIES INCLUDED ARE
WESTON
$$
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.
$$
STATUS REPORT #1 ON WW 357
VALID 100025Z - 100140Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..WENDT..07/10/21
ATTN...WFO...UNR...
&&
STATUS REPORT FOR WS 357
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
SDC033-047-081-102-103-100140-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
CUSTER FALL RIVER LAWRENCE
OGLALA LAKOTA PENNINGTON
$$
WYC005-011-045-100140-
WY
. WYOMING COUNTIES INCLUDED ARE
CAMPBELL CROOK WESTON
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
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 (<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
|
Low (10%)
|
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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