Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for
Watch Status Reports.
SEL8
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 618
NWS Storm Prediction Center Norman OK
1230 PM MDT Sun Aug 11 2024
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Southwest South Dakota
Northeast Wyoming
* Effective this Sunday afternoon and evening from 1230 PM until
700 PM 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...Thunderstorms will increase in coverage and intensity
through the afternoon across the watch area. A few severe storms
are expected, capable of large hail and damaging wind gusts.
The severe thunderstorm watch area is approximately along and 40
statute miles north and south of a line from 50 miles west of Rapid
City SD to 65 miles southeast of Philip SD. For a complete depiction
of the watch see the associated watch outline update (WOUS64 KWNS
WOU8).
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 500. Mean storm motion vector
28030.
...Hart
SEL8
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 618
NWS Storm Prediction Center Norman OK
1230 PM MDT Sun Aug 11 2024
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Southwest South Dakota
Northeast Wyoming
* Effective this Sunday afternoon and evening from 1230 PM until
700 PM 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...Thunderstorms will increase in coverage and intensity
through the afternoon across the watch area. A few severe storms
are expected, capable of large hail and damaging wind gusts.
The severe thunderstorm watch area is approximately along and 40
statute miles north and south of a line from 50 miles west of Rapid
City SD to 65 miles southeast of Philip SD. For a complete depiction
of the watch see the associated watch outline update (WOUS64 KWNS
WOU8).
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 500. Mean storm motion vector
28030.
...Hart
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW8
WW 618 SEVERE TSTM SD WY 111830Z - 120100Z
AXIS..40 STATUTE MILES NORTH AND SOUTH OF LINE..
50W RAP/RAPID CITY SD/ - 65SE PHP/PHILIP SD/
..AVIATION COORDS.. 35NM N/S /45W RAP - 57NNW ANW/
HAIL SURFACE AND ALOFT..2 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 28030.
LAT...LON 44620406 43960068 42800068 43470406
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU8.
Watch 618 Status Report Messages:
STATUS REPORT #3 ON WW 618
VALID 112225Z - 112340Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 35 ENE CDR
TO 40 NW PHP.
..BROYLES..08/11/24
ATTN...WFO...UNR...
&&
STATUS REPORT FOR WS 618
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
SDC007-055-071-093-095-102-103-121-112340-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
BENNETT HAAKON JACKSON
MEADE MELLETTE OGLALA LAKOTA
PENNINGTON TODD
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #2 ON WW 618
VALID 112140Z - 112240Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..BROYLES..08/11/24
ATTN...WFO...UNR...
&&
STATUS REPORT FOR WS 618
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
SDC007-055-071-093-095-102-103-121-112240-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
BENNETT HAAKON JACKSON
MEADE MELLETTE OGLALA LAKOTA
PENNINGTON TODD
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #1 ON WW 618
VALID 112100Z - 112240Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 60 NE DGW TO
40 NNE RAP.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1882
..WEINMAN..08/11/24
ATTN...WFO...UNR...
&&
STATUS REPORT FOR WS 618
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
SDC007-033-047-055-071-093-095-102-103-121-112240-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
BENNETT CUSTER FALL RIVER
HAAKON JACKSON MEADE
MELLETTE OGLALA LAKOTA PENNINGTON
TODD
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
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 (<2%)
|
Wind
Probability of 10 or more severe wind events
|
Mod (40%)
|
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% (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 
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