Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for
Watch Status Reports.
SEL0
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 460
NWS Storm Prediction Center Norman OK
530 PM MDT Thu Aug 27 2020
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Southeast Montana
Southwest North Dakota
Western and Central South Dakota
Northeast Wyoming
* Effective this Thursday afternoon and Friday morning from 530
PM until 100 AM MDT.
* Primary threats include...
Scattered damaging winds likely with isolated significant gusts
to 80 mph possible
Scattered large hail likely with isolated very large hail events
to 3 inches in diameter possible
A tornado or two possible
SUMMARY...Initially isolated severe thunderstorms including
supercells are expected to further develop and increase across the
region this evening. By late evening, one or more
eastward-accelerating clusters should evolve with an increasing wind
damage risk across South Dakota/southern North Dakota.
The severe thunderstorm watch area is approximately along and 120
statute miles east and west of a line from 45 miles north northeast
of Baker MT to 80 miles south southeast of Rapid City SD. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU0).
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 456...WW 457...WW
458...WW 459...
AVIATION...A few severe thunderstorms with hail surface and aloft to
3 inches. Extreme turbulence and surface wind gusts to 70 knots. A
few cumulonimbi with maximum tops to 550. Mean storm motion vector
28020.
...Guyer
SEL0
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 460
NWS Storm Prediction Center Norman OK
530 PM MDT Thu Aug 27 2020
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Southeast Montana
Southwest North Dakota
Western and Central South Dakota
Northeast Wyoming
* Effective this Thursday afternoon and Friday morning from 530
PM until 100 AM MDT.
* Primary threats include...
Scattered damaging winds likely with isolated significant gusts
to 80 mph possible
Scattered large hail likely with isolated very large hail events
to 3 inches in diameter possible
A tornado or two possible
SUMMARY...Initially isolated severe thunderstorms including
supercells are expected to further develop and increase across the
region this evening. By late evening, one or more
eastward-accelerating clusters should evolve with an increasing wind
damage risk across South Dakota/southern North Dakota.
The severe thunderstorm watch area is approximately along and 120
statute miles east and west of a line from 45 miles north northeast
of Baker MT to 80 miles south southeast of Rapid City SD. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU0).
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 456...WW 457...WW
458...WW 459...
AVIATION...A few severe thunderstorms with hail surface and aloft to
3 inches. Extreme turbulence and surface wind gusts to 70 knots. A
few cumulonimbi with maximum tops to 550. Mean storm motion vector
28020.
...Guyer
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW0
WW 460 SEVERE TSTM MT ND SD WY 272330Z - 280700Z
AXIS..120 STATUTE MILES EAST AND WEST OF LINE..
45NNE BHK/BAKER MT/ - 80SSE RAP/RAPID CITY SD/
..AVIATION COORDS.. 105NM E/W /46W DIK - 65SSE RAP/
HAIL SURFACE AND ALOFT..3 INCHES. WIND GUSTS..70 KNOTS.
MAX TOPS TO 550. MEAN STORM MOTION VECTOR 28020.
LAT...LON 46930134 42950007 42950482 46930643
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU0.
Watch 460 Status Report Messages:
STATUS REPORT #5 ON WW 460
VALID 280540Z - 280640Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 N ANW TO
30 E PHP TO 50 SW MBG TO 35 WNW Y22 TO 5 WSW BIS.
..LEITMAN..08/28/20
ATTN...WFO...BYZ...GGW...BIS...UNR...ABR...
&&
STATUS REPORT FOR WS 460
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
NDC001-037-059-085-280640-
ND
. NORTH DAKOTA COUNTIES INCLUDED ARE
ADAMS GRANT MORTON
SIOUX
$$
SDC031-041-075-117-280640-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
CORSON DEWEY JONES
STANLEY
$$
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.
$$
STATUS REPORT #4 ON WW 460
VALID 280320Z - 280440Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 60 E CDR TO
55 S PHP TO 35 SSW PHP TO 15 SSE RAP TO 20 SW RAP TO 50 W RAP TO
45 SSW 2WX TO 25 NE BHK TO 30 WNW DIK TO 50 SE ISN.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1604
..JEWELL..08/28/20
ATTN...WFO...BYZ...GGW...BIS...UNR...ABR...
&&
STATUS REPORT FOR WS 460
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
NDC001-007-011-025-037-041-059-085-087-089-280440-
ND
. NORTH DAKOTA COUNTIES INCLUDED ARE
ADAMS BILLINGS BOWMAN
DUNN GRANT HETTINGER
MORTON SIOUX SLOPE
STARK
$$
SDC007-019-031-041-055-063-071-075-081-093-095-103-105-117-121-
137-280440-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
BENNETT BUTTE CORSON
DEWEY HAAKON HARDING
JACKSON JONES LAWRENCE
MEADE MELLETTE PENNINGTON
PERKINS STANLEY TODD
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 460
VALID 280235Z - 280340Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 10 NNE CDR
TO 50 WNW RAP TO 10 ESE 2WX TO 30 W DIK TO 20 ESE SDY.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1604
..LYONS..08/28/20
ATTN...WFO...BYZ...GGW...BIS...UNR...ABR...
&&
STATUS REPORT FOR WS 460
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
NDC001-007-011-025-037-041-059-085-087-089-280340-
ND
. NORTH DAKOTA COUNTIES INCLUDED ARE
ADAMS BILLINGS BOWMAN
DUNN GRANT HETTINGER
MORTON SIOUX SLOPE
STARK
$$
SDC007-019-031-041-055-063-071-075-081-093-095-102-103-105-117-
121-137-280340-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
BENNETT BUTTE CORSON
DEWEY HAAKON HARDING
JACKSON JONES LAWRENCE
MEADE MELLETTE OGLALA LAKOTA
PENNINGTON PERKINS STANLEY
TODD ZIEBACH
$$
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.
$$
STATUS REPORT #2 ON WW 460
VALID 280135Z - 280240Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 50 N DGW TO
20 NE BHK TO 35 W SDY.
..LYONS..08/28/20
ATTN...WFO...BYZ...GGW...BIS...UNR...ABR...
&&
STATUS REPORT FOR WS 460
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MTC011-025-109-280240-
MT
. MONTANA COUNTIES INCLUDED ARE
CARTER FALLON WIBAUX
$$
NDC001-007-011-025-033-037-041-059-085-087-089-280240-
ND
. NORTH DAKOTA COUNTIES INCLUDED ARE
ADAMS BILLINGS BOWMAN
DUNN GOLDEN VALLEY GRANT
HETTINGER MORTON SIOUX
SLOPE STARK
$$
SDC007-019-031-033-041-047-055-063-071-075-081-093-095-102-103-
105-117-121-137-280240-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
BENNETT BUTTE CORSON
CUSTER DEWEY FALL RIVER
HAAKON HARDING JACKSON
JONES LAWRENCE MEADE
MELLETTE OGLALA LAKOTA PENNINGTON
PERKINS STANLEY TODD
ZIEBACH
$$
WYC011-045-280240-
WY
. WYOMING COUNTIES INCLUDED ARE
CROOK WESTON
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #1 ON WW 460
VALID 280030Z - 280140Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..LYONS..08/28/20
ATTN...WFO...BYZ...GGW...BIS...UNR...ABR...
&&
STATUS REPORT FOR WS 460
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MTC011-017-021-025-075-079-109-280140-
MT
. MONTANA COUNTIES INCLUDED ARE
CARTER CUSTER DAWSON
FALLON POWDER RIVER PRAIRIE
WIBAUX
$$
NDC001-007-011-025-033-037-041-059-085-087-089-280140-
ND
. NORTH DAKOTA COUNTIES INCLUDED ARE
ADAMS BILLINGS BOWMAN
DUNN GOLDEN VALLEY GRANT
HETTINGER MORTON SIOUX
SLOPE STARK
$$
SDC007-019-031-033-041-047-055-063-071-075-081-093-095-102-103-
105-117-121-137-280140-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
BENNETT BUTTE CORSON
CUSTER DEWEY FALL RIVER
HAAKON HARDING JACKSON
JONES LAWRENCE MEADE
MELLETTE OGLALA LAKOTA PENNINGTON
PERKINS STANLEY TODD
ZIEBACH
$$
WYC005-011-045-280140-
WY
. WYOMING COUNTIES INCLUDED ARE
CAMPBELL CROOK WESTON
$$
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 (20%)
|
Probability of 1 or more strong (EF2-EF5) tornadoes
|
Low (10%)
|
Wind
Probability of 10 or more severe wind events
|
Mod (60%)
|
Probability of 1 or more wind events > 65 knots
|
Mod (50%)
|
Hail
Probability of 10 or more severe hail events
|
High (70%)
|
Probability of 1 or more hailstones > 2 inches
|
Mod (50%)
|
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 
@NWSSPC
