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The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
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Watch Status Reports.
SEL3
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 673
NWS STORM PREDICTION CENTER NORMAN OK
455 PM MDT FRI AUG 7 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
WESTERN SOUTH DAKOTA
EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 455 PM UNTIL
1100 PM MDT.
HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60
STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES NORTHEAST OF
BUFFALO SOUTH DAKOTA TO 75 MILES SOUTH SOUTHEAST OF RAPID CITY
SOUTH DAKOTA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).
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 672...
DISCUSSION...THUNDERSTORMS WILL CONTINUE DEVELOPING ENEWD ACROSS WRN
SD THROUGH THE EVENING AHEAD OF LARGE UPPER LOW OVER THE NRN
ROCKIES. REGION REMAINS WITHIN NLY SFC FLOW IN WAKE OF A SURFACE
COLD FRONT...HOWEVER SUFFICIENT INSTABILITY REMAINS FOR ROBUST
THUNDERSTORM DEVELOPMENT...DESPITE BECOMING SOMEWHAT ELEVATED.
SHEAR WILL ALSO REMAIN SUPPORTIVE OF SUPERCELLS...WITH SPLITTING
STORMS LIKELY GIVEN LARGE STRAIGHT HODOGRAPHS. MOST LIKELY AREA
WILL BE INTO NWRN SD THIS EVENING...ALTHOUGH DEEP MIXING MAY ALSO
SUPPORT ISOLATED SEVERE THUNDERSTORMS NEAR THE NEB BORDER.
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.
...EVANS
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW3
WW 673 SEVERE TSTM SD 072255Z - 080500Z
AXIS..60 STATUTE MILES EAST AND WEST OF LINE..
40NE 2WX/BUFFALO SD/ - 75SSE RAP/RAPID CITY SD/
..AVIATION COORDS.. 50NM E/W /53S DIK - 61SSE RAP/
HAIL SURFACE AND ALOFT..2 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 450. MEAN STORM MOTION VECTOR 23030.
LAT...LON 45970168 43040129 43040366 45970418
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU3.
Watch 673 Status Report Messages:
STATUS REPORT #5 ON WW 673
VALID 080335Z - 080440Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..MEAD..08/08/09
ATTN...WFO...UNR...
&&
STATUS REPORT FOR WS 673
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
SDC007-019-033-047-055-063-071-081-093-103-105-113-137-080440-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
BENNETT BUTTE CUSTER
FALL RIVER HAAKON HARDING
JACKSON LAWRENCE MEADE
PENNINGTON PERKINS SHANNON
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 #4 ON WW 673
VALID 080235Z - 080340Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..MEAD..08/08/09
ATTN...WFO...UNR...
&&
STATUS REPORT FOR WS 673
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
SDC007-019-033-047-055-063-071-081-093-103-105-113-137-080340-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
BENNETT BUTTE CUSTER
FALL RIVER HAAKON HARDING
JACKSON LAWRENCE MEADE
PENNINGTON PERKINS SHANNON
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 673
VALID 080135Z - 080240Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..MEAD..08/08/09
ATTN...WFO...UNR...
&&
STATUS REPORT FOR WS 673
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
SDC007-019-033-047-055-063-071-081-093-103-105-113-137-080240-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
BENNETT BUTTE CUSTER
FALL RIVER HAAKON HARDING
JACKSON LAWRENCE MEADE
PENNINGTON PERKINS SHANNON
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 673
VALID 080040Z - 080140Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..MEAD..08/08/09
ATTN...WFO...UNR...
&&
STATUS REPORT FOR WS 673
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
SDC007-019-033-047-055-063-071-081-093-103-105-113-137-080140-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
BENNETT BUTTE CUSTER
FALL RIVER HAAKON HARDING
JACKSON LAWRENCE MEADE
PENNINGTON PERKINS SHANNON
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 673
VALID 072335Z - 080040Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..MEAD..08/07/09
ATTN...WFO...UNR...
&&
STATUS REPORT FOR WS 673
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
SDC007-019-033-047-055-063-071-081-093-103-105-113-137-080040-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
BENNETT BUTTE CUSTER
FALL RIVER HAAKON HARDING
JACKSON LAWRENCE MEADE
PENNINGTON PERKINS SHANNON
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 (<5%)
|
Probability of 1 or more strong (F2-F5) tornadoes
|
Low (5%)
|
Wind
Probability of 10 or more severe wind events
|
Low (20%)
|
Probability of 1 or more wind events > 65 knots
|
Low (10%)
|
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 (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% (F2-F5 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 
