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SPC Tornado/Severe Thunderstorm Watches



Storm Prediction Center



Published: Mon, 21 Aug 2017 19:48:02 +0000

Last Build Date: Mon, 21 Aug 2017 19:48:02 +0000

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SPC Severe Thunderstorm Watch 460

Mon, 21 Aug 2017 19:48:02 +0000

WW 460 SEVERE TSTM IA MN NE SD 211635Z - 220000Z
(image)

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 460
NWS Storm Prediction Center Norman OK
1135 AM CDT Mon Aug 21 2017

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  Northwest Iowa
  Southwest Minnesota
  Northeast Nebraska
  Southeast South Dakota

* Effective this Monday morning and evening from 1135 AM until
  700 PM CDT.

* Primary threats include...
  Scattered damaging winds and isolated significant gusts to 75
    mph possible
  Scattered large hail and isolated very large hail events to 2
    inches in diameter possible

SUMMARY...Cluster of severe storms over south-central South Dakota
should continue east-southeast with additional storm development
possible to its south and east. A swath of large hail and damaging
winds is expected this afternoon.

The severe thunderstorm watch area is approximately along and 75
statute miles north and south of a line from 45 miles south of
Chamberlain SD to 30 miles north of Storm Lake IA. 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 459...

AVIATION...A few severe thunderstorms with hail surface and aloft to
2 inches. Extreme turbulence and surface wind gusts to 65 knots. A
few cumulonimbi with maximum tops to 550. Mean storm motion vector
29030.

...Grams

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SPC Severe Thunderstorm Watch 460 Status Reports

Mon, 21 Aug 2017 19:48:03 +0000

WW 0460 Status Updates
(image)

STATUS REPORT ON WW 460

SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 ENE BUB
TO 25 E YKN TO 20 NE FSD TO 10 NW FRM.

FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1543

..DEAN..08/21/17

ATTN...WFO...FSD...OAX...LBF...


STATUS REPORT FOR WS 460 

SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS 

IAC021-035-041-059-093-119-133-141-143-149-167-193-212040-

IA 
.    IOWA COUNTIES INCLUDED ARE

BUENA VISTA          CHEROKEE            CLAY                
DICKINSON            IDA                 LYON                
MONONA               O'BRIEN             OSCEOLA             
PLYMOUTH             SIOUX               WOODBURY            


MNC063-105-133-212040-

MN 
.    MINNESOTA COUNTIES INCLUDED ARE

JACKSON              NOBLES              ROCK                


NEC003-021-027-039-043-051-119-139-167-173-179-212040-

NE 
.    NEBRASKA COUNTIES INCLUDED ARE
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SPC Severe Thunderstorm Watch 459 Status Reports

Mon, 21 Aug 2017 17:41:05 +0000

WW 0459 Status Updates
(image)

STATUS REPORT ON WW 459

SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 NE ANW TO
25 SSE 9V9 TO 15 NNE MHE.

..DEAN..08/21/17

ATTN...WFO...FSD...ABR...UNR...


STATUS REPORT FOR WS 459 

SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS 

SDC003-023-035-043-053-211840-

SD 
.    SOUTH DAKOTA COUNTIES INCLUDED ARE

AURORA               CHARLES MIX         DAVISON             
DOUGLAS              GREGORY             


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.

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