Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for
Watch Status Reports.
SEL2
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 432
NWS Storm Prediction Center Norman OK
635 PM MDT Tue Aug 11 2020
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Southwestern North Dakota
Northwestern South Dakota
* Effective this Tuesday night and Wednesday morning from 635 PM
until 100 AM MDT.
* Primary threats include...
Scattered damaging wind gusts to 70 mph possible
Scattered large hail events to 1.5 inches in diameter possible
SUMMARY...Clusters of storms forming in southeastern Montana and
southwestern North Dakota may persist into the overnight hours while
spreading east-southeastward across northwestern South Dakota. Some
supercell structures will be possible this evening, while upscale
growth into a cluster is expected tonight. The strongest embedded
storms will be capable of producing damaging winds and large hail.
The severe thunderstorm watch area is approximately along and 45
statute miles north and south of a line from 30 miles northwest of
Buffalo SD to 85 miles east southeast of Lemmon SD. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU2).
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
1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 550. Mean storm motion vector
29020.
...Thompson
SEL2
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 432
NWS Storm Prediction Center Norman OK
635 PM MDT Tue Aug 11 2020
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Southwestern North Dakota
Northwestern South Dakota
* Effective this Tuesday night and Wednesday morning from 635 PM
until 100 AM MDT.
* Primary threats include...
Scattered damaging wind gusts to 70 mph possible
Scattered large hail events to 1.5 inches in diameter possible
SUMMARY...Clusters of storms forming in southeastern Montana and
southwestern North Dakota may persist into the overnight hours while
spreading east-southeastward across northwestern South Dakota. Some
supercell structures will be possible this evening, while upscale
growth into a cluster is expected tonight. The strongest embedded
storms will be capable of producing damaging winds and large hail.
The severe thunderstorm watch area is approximately along and 45
statute miles north and south of a line from 30 miles northwest of
Buffalo SD to 85 miles east southeast of Lemmon SD. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU2).
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
1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 550. Mean storm motion vector
29020.
...Thompson
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW2
WW 432 SEVERE TSTM ND SD 120035Z - 120700Z
AXIS..45 STATUTE MILES NORTH AND SOUTH OF LINE..
30NW 2WX/BUFFALO SD/ - 85ESE Y22/LEMMON SD/
..AVIATION COORDS.. 40NM N/S /77SW DIK - 54ENE DPR/
HAIL SURFACE AND ALOFT..1.5 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 550. MEAN STORM MOTION VECTOR 29020.
LAT...LON 46530396 46100055 44800055 45220396
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU2.
Watch 432 Status Report Messages:
STATUS REPORT #4 ON WW 432
VALID 120445Z - 120540Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 60 SE 2WX TO
40 SE Y22 TO 25 ENE Y22 TO 40 ENE Y22.
..GOSS..08/12/20
ATTN...WFO...BIS...ABR...UNR...
&&
STATUS REPORT FOR WS 432
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
NDC085-120540-
ND
. NORTH DAKOTA COUNTIES INCLUDED ARE
SIOUX
$$
SDC031-041-137-120540-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
CORSON DEWEY ZIEBACH
$$
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.
$$
STATUS REPORT #3 ON WW 432
VALID 120340Z - 120440Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 30 W 2WX TO
30 SW Y22 TO 10 ENE Y22 TO 35 NE Y22.
..GOSS..08/12/20
ATTN...WFO...BIS...ABR...UNR...
&&
STATUS REPORT FOR WS 432
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
NDC037-085-120440-
ND
. NORTH DAKOTA COUNTIES INCLUDED ARE
GRANT SIOUX
$$
SDC031-041-063-105-137-120440-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
CORSON DEWEY HARDING
PERKINS ZIEBACH
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #2 ON WW 432
VALID 120255Z - 120340Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 SSE BHK
TO 40 ESE BHK TO 25 S DIK.
..GOSS..08/12/20
ATTN...WFO...BIS...ABR...UNR...
&&
STATUS REPORT FOR WS 432
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
NDC001-011-037-041-085-087-120340-
ND
. NORTH DAKOTA COUNTIES INCLUDED ARE
ADAMS BOWMAN GRANT
HETTINGER SIOUX SLOPE
$$
SDC031-041-063-105-137-120340-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
CORSON DEWEY HARDING
PERKINS ZIEBACH
$$
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.
$$
STATUS REPORT #1 ON WW 432
VALID 120220Z - 120340Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 SSE BHK
TO 30 SW DIK.
..GOSS..08/12/20
ATTN...WFO...BIS...ABR...UNR...
&&
STATUS REPORT FOR WS 432
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
NDC001-011-037-041-085-087-120340-
ND
. NORTH DAKOTA COUNTIES INCLUDED ARE
ADAMS BOWMAN GRANT
HETTINGER SIOUX SLOPE
$$
SDC031-041-063-105-137-120340-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
CORSON DEWEY HARDING
PERKINS ZIEBACH
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
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 (20%)
|
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.
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