Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for
Watch Status Reports.
SEL9
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 339
NWS Storm Prediction Center Norman OK
605 PM MDT Tue Jul 7 2020
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Western South Dakota
* Effective this Tuesday night from 605 PM until Midnight MDT.
* Primary threats include...
Scattered large hail and isolated very large hail events to 2
inches in diameter possible
Scattered damaging wind gusts to 70 mph possible
A tornado or two possible
SUMMARY...An ongoing thunderstorm cluster in southwest South Dakota
will develop northeastward, while a separate cluster in southeast
Montana will move into northwest South Dakota. Both of these storm
clusters will be capable of producing damaging winds and large hail.
There is also some chance for embedded supercell structures capable
of producing an isolated tornado.
The severe thunderstorm watch area is approximately along and 60
statute miles east and west of a line from 40 miles northeast of
Buffalo SD to 35 miles west southwest of Philip SD. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU9).
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
2 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 550. Mean storm motion vector
26035.
...Thompson
SEL9
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 339
NWS Storm Prediction Center Norman OK
605 PM MDT Tue Jul 7 2020
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Western South Dakota
* Effective this Tuesday night from 605 PM until Midnight MDT.
* Primary threats include...
Scattered large hail and isolated very large hail events to 2
inches in diameter possible
Scattered damaging wind gusts to 70 mph possible
A tornado or two possible
SUMMARY...An ongoing thunderstorm cluster in southwest South Dakota
will develop northeastward, while a separate cluster in southeast
Montana will move into northwest South Dakota. Both of these storm
clusters will be capable of producing damaging winds and large hail.
There is also some chance for embedded supercell structures capable
of producing an isolated tornado.
The severe thunderstorm watch area is approximately along and 60
statute miles east and west of a line from 40 miles northeast of
Buffalo SD to 35 miles west southwest of Philip SD. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU9).
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
2 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 550. Mean storm motion vector
26035.
...Thompson
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW9
WW 339 SEVERE TSTM SD 080005Z - 080600Z
AXIS..60 STATUTE MILES EAST AND WEST OF LINE..
40NE 2WX/BUFFALO SD/ - 35WSW PHP/PHILIP SD/
..AVIATION COORDS.. 50NM E/W /53S DIK - 34ESE RAP/
HAIL SURFACE AND ALOFT..2 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 550. MEAN STORM MOTION VECTOR 26035.
LAT...LON 45970168 43850104 43850345 45970418
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU9.
Watch 339 Status Report Messages:
STATUS REPORT #5 ON WW 339
VALID 080415Z - 080540Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 40 SE Y22 TO
50 SE 2WX TO 30 WSW 2WX.
..DIAL..07/08/20
ATTN...WFO...UNR...
&&
STATUS REPORT FOR WS 339
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
SDC063-105-080540-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
HARDING PERKINS
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #4 ON WW 339
VALID 080250Z - 080340Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 30 SW PHP TO
60 NNE RAP TO 35 E 4BQ.
..MOORE..07/08/20
ATTN...WFO...UNR...
&&
STATUS REPORT FOR WS 339
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
SDC055-063-105-137-080340-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
HAAKON 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 #3 ON WW 339
VALID 080220Z - 080340Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 35 SE PHP TO
35 WSW PHP TO 10 N RAP TO 40 WSW 2WX.
..MOORE..07/08/20
ATTN...WFO...UNR...
&&
STATUS REPORT FOR WS 339
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
SDC019-055-063-093-105-137-080340-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
BUTTE HAAKON HARDING
MEADE 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 339
VALID 080150Z - 080240Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 55 NW MHN TO
55 NE CDR TO 60 WNW RAP TO 30 E 4BQ.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1135
..MOORE..07/08/20
ATTN...WFO...UNR...
&&
STATUS REPORT FOR WS 339
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
SDC007-019-055-063-071-081-093-103-105-137-080240-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
BENNETT BUTTE HAAKON
HARDING JACKSON LAWRENCE
MEADE PENNINGTON 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 339
VALID 080105Z - 080240Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 E CDR TO
30 WSW RAP TO 55 WNW RAP TO 40 WSW 2WX.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1135
..MOORE..07/08/20
ATTN...WFO...UNR...
&&
STATUS REPORT FOR WS 339
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
SDC007-019-055-063-071-081-093-102-103-105-137-080240-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
BENNETT BUTTE HAAKON
HARDING JACKSON LAWRENCE
MEADE OGLALA LAKOTA PENNINGTON
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 (20%)
|
Probability of 1 or more strong (EF2-EF5) tornadoes
|
Low (5%)
|
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
|
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% (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
