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cat $HOME/public_html/posts/storm-prediction-center-severe-thunderstorm-watch-576.txt >> story.html | parse_story story.html; rm -f storm-prediction-center-severe-thunderstorm-watch-576.txt story.html
Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for Watch Status Reports.
SEL6
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 576
NWS Storm Prediction Center Norman OK
105 PM MDT Wed Aug 12 2026
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Western South Dakota
Extreme northeast Wyoming
* Effective this Wednesday afternoon and evening from 105 PM
until 800 PM MDT.
* Primary threats include...
Scattered damaging winds and isolated significant gusts to 75
mph possible
Scattered large hail and isolated very large hail events to 3
inches in diameter possible
A tornado or two possible
SUMMARY...Isolated supercells are expected to move generally
eastward from Wyoming into South Dakota, with additional storm
development possible through the afternoon toward northwest South
Dakota. Isolated very large hail up to 3 inches in diameter will be
a primary threat, though an isolated tornado will be possible near
the Wyoming/South Dakota border. A greater threat for severe
outflow gusts is expected later this afternoon/evening with any
storm clustering.
The severe thunderstorm watch area is approximately along and 65
statute miles east and west of a line from 105 miles north of Rapid
City SD to 70 miles south of Rapid City SD. For a complete depiction
of the watch see the associated watch outline update (WOUS64 KWNS
WOU6).
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 575...
AVIATION...A few severe thunderstorms with hail surface and aloft to
3 inches. Extreme turbulence and surface wind gusts to 65 knots. A
few cumulonimbi with maximum tops to 550. Mean storm motion vector
29025.
...Thompson
SEL6
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 576
NWS Storm Prediction Center Norman OK
105 PM MDT Wed Aug 12 2026
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Western South Dakota
Extreme northeast Wyoming
* Effective this Wednesday afternoon and evening from 105 PM
until 800 PM MDT.
* Primary threats include...
Scattered damaging winds and isolated significant gusts to 75
mph possible
Scattered large hail and isolated very large hail events to 3
inches in diameter possible
A tornado or two possible
SUMMARY...Isolated supercells are expected to move generally
eastward from Wyoming into South Dakota, with additional storm
development possible through the afternoon toward northwest South
Dakota. Isolated very large hail up to 3 inches in diameter will be
a primary threat, though an isolated tornado will be possible near
the Wyoming/South Dakota border. A greater threat for severe
outflow gusts is expected later this afternoon/evening with any
storm clustering.
The severe thunderstorm watch area is approximately along and 65
statute miles east and west of a line from 105 miles north of Rapid
City SD to 70 miles south of Rapid City SD. For a complete depiction
of the watch see the associated watch outline update (WOUS64 KWNS
WOU6).
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 575...
AVIATION...A few severe thunderstorms with hail surface and aloft to
3 inches. Extreme turbulence and surface wind gusts to 65 knots. A
few cumulonimbi with maximum tops to 550. Mean storm motion vector
29025.
...Thompson
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW6 WW 576 SEVERE TSTM SD WY 121905Z - 130200Z AXIS..65 STATUTE MILES EAST AND WEST OF LINE.. 105N RAP/RAPID CITY SD/ - 70S RAP/RAPID CITY SD/ ..AVIATION COORDS.. 55NM E/W /63WNW DPR - 57S RAP/ HAIL SURFACE AND ALOFT..3 INCHES. WIND GUSTS..65 KNOTS. MAX TOPS TO 550. MEAN STORM MOTION VECTOR 29025. LAT...LON 45560171 43030176 43030434 45560439 THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS FOR WOU6.
Watch 576 Status Report Messages:
STATUS REPORT #1 ON WW 576 VALID 122055Z - 122140Z THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA. ..CHALMERS..08/12/26 ATTN...WFO...UNR... && STATUS REPORT FOR WS 576 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS SDC007-019-033-047-055-063-071-081-093-102-103-105-137-122140- SD . SOUTH DAKOTA COUNTIES INCLUDED ARE BENNETT BUTTE CUSTER FALL RIVER HAAKON HARDING JACKSON LAWRENCE MEADE OGLALA LAKOTA PENNINGTON PERKINS ZIEBACH $$ WYC011-045-122140- WY . WYOMING COUNTIES INCLUDED ARE CROOK WESTON $$ 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. $$
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 ( |
Wind
| Probability of 10 or more severe wind events |
Mod (40%) |
| Probability of 1 or more wind events > 65 knots |
Mod (40%) |
Hail
| Probability of 10 or more severe hail events |
Mod (40%) |
| Probability of 1 or more hailstones > 2 inches |
Mod (40%) |
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.