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cat $HOME/public_html/posts/storm-prediction-center-severe-thunderstorm-watch-578.txt >> story.html | parse_story story.html; rm -f storm-prediction-center-severe-thunderstorm-watch-578.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.
SEL8
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 578
NWS Storm Prediction Center Norman OK
230 PM MDT Wed Aug 12 2026
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Northeast Colorado
The Nebraska Panhandle
Southeast Wyoming
* Effective this Wednesday afternoon and evening from 230 PM
until 900 PM MDT.
* Primary threats include...
Scattered damaging winds and isolated significant gusts to 80
mph possible
Scattered large hail and isolated very large hail events to 2.5
inches in diameter possible
SUMMARY...Isolated storm development is underway across southeast
Wyoming, and additional storms are expected this afternoon into the
Nebraska Panhandle and northeast Colorado. Large hail (potentially
exceeding 2 inches in diameter) will be possible with
initial/discrete supercells, while the threat for severe outflow
gusts of 60-80 mph will increase with storm clustering later this
afternoon through late evening.
The severe thunderstorm watch area is approximately along and 75
statute miles east and west of a line from 20 miles northwest of
Chadron NE to 15 miles southwest of Akron CO. 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.
&&
OTHER WATCH INFORMATION...CONTINUE...WW 575...WW 576...WW 577...
AVIATION...A few severe thunderstorms with hail surface and aloft to
2.5 inches. Extreme turbulence and surface wind gusts to 70 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
24035.
...Thompson
SEL8
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 578
NWS Storm Prediction Center Norman OK
230 PM MDT Wed Aug 12 2026
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Northeast Colorado
The Nebraska Panhandle
Southeast Wyoming
* Effective this Wednesday afternoon and evening from 230 PM
until 900 PM MDT.
* Primary threats include...
Scattered damaging winds and isolated significant gusts to 80
mph possible
Scattered large hail and isolated very large hail events to 2.5
inches in diameter possible
SUMMARY...Isolated storm development is underway across southeast
Wyoming, and additional storms are expected this afternoon into the
Nebraska Panhandle and northeast Colorado. Large hail (potentially
exceeding 2 inches in diameter) will be possible with
initial/discrete supercells, while the threat for severe outflow
gusts of 60-80 mph will increase with storm clustering later this
afternoon through late evening.
The severe thunderstorm watch area is approximately along and 75
statute miles east and west of a line from 20 miles northwest of
Chadron NE to 15 miles southwest of Akron CO. 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.
&&
OTHER WATCH INFORMATION...CONTINUE...WW 575...WW 576...WW 577...
AVIATION...A few severe thunderstorms with hail surface and aloft to
2.5 inches. Extreme turbulence and surface wind gusts to 70 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
24035.
...Thompson
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW8 WW 578 SEVERE TSTM CO NE WY 122030Z - 130300Z AXIS..75 STATUTE MILES EAST AND WEST OF LINE.. 20NW CDR/CHADRON NE/ - 15SW AKO/AKRON CO/ ..AVIATION COORDS.. 65NM E/W /59SSW RAP - 14SW AKO/ HAIL SURFACE AND ALOFT..2.5 INCHES. WIND GUSTS..70 KNOTS. MAX TOPS TO 500. MEAN STORM MOTION VECTOR 24035. LAT...LON 43020190 40020200 40020484 43020486 THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS FOR WOU8.
Watch 578 Status Report Messages:
STATUS REPORT #2 ON WW 578 VALID 130135Z - 130240Z SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 NW ITR TO 30 WNW SNY TO 35 NW CDR. ..THORNTON..08/13/26 ATTN...WFO...BOU...GLD...CYS...LBF... && STATUS REPORT FOR WS 578 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS COC075-095-115-125-130240- CO . COLORADO COUNTIES INCLUDED ARE LOGAN PHILLIPS SEDGWICK YUMA $$ NEC013-033-045-049-069-123-161-130240- NE . NEBRASKA COUNTIES INCLUDED ARE BOX BUTTE CHEYENNE DAWES DEUEL GARDEN MORRILL SHERIDAN $$ WYC027-130240- WY . WYOMING COUNTIES INCLUDED ARE NIOBRARA $$ THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. $$ STATUS REPORT #1 ON WW 578 VALID 130015Z - 130140Z SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 NW ITR TO 15 E DGW. FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1961 ..THORNTON..08/13/26 ATTN...WFO...BOU...GLD...CYS...LBF... && STATUS REPORT FOR WS 578 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS COC075-095-115-125-130140- CO . COLORADO COUNTIES INCLUDED ARE LOGAN PHILLIPS SEDGWICK YUMA $$ NEC007-013-033-045-049-069-105-123-157-161-165-130140- NE . NEBRASKA COUNTIES INCLUDED ARE BANNER BOX BUTTE CHEYENNE DAWES DEUEL GARDEN KIMBALL MORRILL SCOTTS BLUFF SHERIDAN SIOUX $$ WYC015-027-130140- WY . WYOMING COUNTIES INCLUDED ARE GOSHEN NIOBRARA $$ THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. $$
Note:
Click for Complete Product Text.
Tornadoes
| Probability of 2 or more tornadoes |
Low (10%) |
| Probability of 1 or more strong (EF2-EF5) tornadoes |
Low ( |
Wind
| Probability of 10 or more severe wind events |
Mod (50%) |
| Probability of 1 or more wind events > 65 knots |
Mod (50%) |
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 (80%) |
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.