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cat $HOME/public_html/posts/storm-prediction-center-severe-thunderstorm-watch-613.txt >> story.html | parse_story story.html; rm -f storm-prediction-center-severe-thunderstorm-watch-613.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.
SEL3
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 613
NWS Storm Prediction Center Norman OK
815 PM MDT Fri Aug 21 2026
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Northeast Colorado
Extreme northwest Kansas
Extreme southwest Nebraska
* Effective this Friday night and Saturday morning from 815 PM
until 100 AM 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 2.5
inches in diameter possible
SUMMARY...Initial supercells in the southwest Nebraska Panhandle
will tend to grow upscale into a cluster while moving
south-southeastward across northeast Colorado and adjacent areas of
Kansas/Nebraska. Isolated very large hail up to 2.5 inches in
diameter will be possible prior to upscale growth, while the threat
for severe outflow gusts of 60-75 mph will increase some once
clustering occurs.
The severe thunderstorm watch area is approximately along and 50
statute miles east and west of a line from 60 miles north northeast
of Akron CO to 10 miles southeast of Burlington CO. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU3).
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 610...WW 612...
AVIATION...A few severe thunderstorms with hail surface and aloft to
2.5 inches. Extreme turbulence and surface wind gusts to 65 knots. A
few cumulonimbi with maximum tops to 550. Mean storm motion vector
34025.
...Thompson
SEL3
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 613
NWS Storm Prediction Center Norman OK
815 PM MDT Fri Aug 21 2026
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Northeast Colorado
Extreme northwest Kansas
Extreme southwest Nebraska
* Effective this Friday night and Saturday morning from 815 PM
until 100 AM 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 2.5
inches in diameter possible
SUMMARY...Initial supercells in the southwest Nebraska Panhandle
will tend to grow upscale into a cluster while moving
south-southeastward across northeast Colorado and adjacent areas of
Kansas/Nebraska. Isolated very large hail up to 2.5 inches in
diameter will be possible prior to upscale growth, while the threat
for severe outflow gusts of 60-75 mph will increase some once
clustering occurs.
The severe thunderstorm watch area is approximately along and 50
statute miles east and west of a line from 60 miles north northeast
of Akron CO to 10 miles southeast of Burlington CO. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU3).
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 610...WW 612...
AVIATION...A few severe thunderstorms with hail surface and aloft to
2.5 inches. Extreme turbulence and surface wind gusts to 65 knots. A
few cumulonimbi with maximum tops to 550. Mean storm motion vector
34025.
...Thompson
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW3 WW 613 SEVERE TSTM CO KS NE 220215Z - 220700Z AXIS..50 STATUTE MILES EAST AND WEST OF LINE.. 60NNE AKO/AKRON CO/ - 10SE ITR/BURLINGTON CO/ ..AVIATION COORDS.. 45NM E/W /12SE SNY - 26SW GLD/ HAIL SURFACE AND ALOFT..2.5 INCHES. WIND GUSTS..65 KNOTS. MAX TOPS TO 550. MEAN STORM MOTION VECTOR 34025. LAT...LON 40980182 39130122 39130308 40980374 THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS FOR WOU3.
Watch 613 Status Report Message has not been issued yet.
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.