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cat $HOME/public_html/posts/storm-prediction-center-severe-thunderstorm-watch-620.txt >> story.html | parse_story story.html; rm -f storm-prediction-center-severe-thunderstorm-watch-620.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.
SEL0
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 620
NWS Storm Prediction Center Norman OK
350 PM MDT Sun Aug 23 2026
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Eastern Montana
* Effective this Sunday afternoon and evening from 350 PM until
1000 PM MDT.
* Primary threats include...
Scattered damaging winds and isolated significant gusts to 75
mph possible
Isolated large hail events to 1.5 inches in diameter possible
SUMMARY...Scattered high-based thunderstorms will spread eastward
from central into eastern Montana through late evening. A few
supercell structures with large hail will be possible initially.
The threat for severe outflow gusts of 60-75 mph will increase as
storms cluster over time.
The severe thunderstorm watch area is approximately along and 100
statute miles east and west of a line from 55 miles north northeast
of Glasgow MT to 80 miles southeast of Billings MT. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU0).
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 617...WW 618...WW 619...
AVIATION...A few severe thunderstorms with hail surface and aloft to
1.5 inches. Extreme turbulence and surface wind gusts to 65 knots. A
few cumulonimbi with maximum tops to 450. Mean storm motion vector
27030.
...Thompson
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW0 WW 620 SEVERE TSTM MT 232150Z - 240400Z AXIS..100 STATUTE MILES EAST AND WEST OF LINE.. 55NNE GGW/GLASGOW MT/ - 80SE BIL/BILLINGS MT/ ..AVIATION COORDS.. 85NM E/W /48NNE GGW - 16WNW SHR/ HAIL SURFACE AND ALOFT..1.5 INCHES. WIND GUSTS..65 KNOTS. MAX TOPS TO 450. MEAN STORM MOTION VECTOR 27030. LAT...LON 48930395 44960533 44960942 48930836 THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS FOR WOU0.
Watch 620 Status Report Messages:
STATUS REPORT #2 ON WW 620 VALID 240220Z - 240340Z SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 35 WSW BIL TO 50 ENE BIL TO 80 NNE BIL TO 45 ESE LWT TO 75 ENE LWT TO 35 SW OLF TO 85 NNE GGW. ..LYONS..08/24/26 ATTN...WFO...BYZ...GGW... && STATUS REPORT FOR WS 620 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MTC003-011-017-019-021-025-033-055-069-075-079-083-085-087-091- 103-109-240340- MT . MONTANA COUNTIES INCLUDED ARE BIG HORN CARTER CUSTER DANIELS DAWSON FALLON GARFIELD MCCONE PETROLEUM POWDER RIVER PRAIRIE RICHLAND ROOSEVELT ROSEBUD SHERIDAN TREASURE WIBAUX $$ THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. $$ STATUS REPORT #1 ON WW 620 VALID 240110Z - 240240Z SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 45 NE LWT TO 45 SW GGW TO 90 N GGW. ..LYONS..08/24/26 ATTN...WFO...BYZ...GGW... && STATUS REPORT FOR WS 620 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MTC003-011-017-019-021-025-033-055-065-069-075-079-083-085-087- 091-103-105-109-111-240240- MT . MONTANA COUNTIES INCLUDED ARE BIG HORN CARTER CUSTER DANIELS DAWSON FALLON GARFIELD MCCONE MUSSELSHELL PETROLEUM POWDER RIVER PRAIRIE RICHLAND ROOSEVELT ROSEBUD SHERIDAN TREASURE VALLEY WIBAUX YELLOWSTONE $$ THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. $$
Note:
Click for Complete Product Text.
Tornadoes
| Probability of 2 or more tornadoes |
Low ( |
| 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 (40%) |
Hail
| Probability of 10 or more severe hail events |
Low (20%) |
| Probability of 1 or more hailstones > 2 inches |
Low (10%) |
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.