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 643
NWS Storm Prediction Center Norman OK
625 PM MDT Wed Aug 21 2024
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Northeast Montana
* Effective this Wednesday night and Thursday morning from 625 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...Thunderstorms should continue to intensify this evening
across parts of northeast Montana, while posing a threat for large
to very large hail around 1.5-2.5 inches in diameter, along with
severe/damaging winds up to 65-75 mph.
The severe thunderstorm watch area is approximately along and 120
statute miles east and west of a line from 50 miles north of Glasgow
MT to 95 miles south of Glasgow MT. 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 642...
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 500. Mean storm motion vector
26025.
...Gleason
SEL3
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 643
NWS Storm Prediction Center Norman OK
625 PM MDT Wed Aug 21 2024
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Northeast Montana
* Effective this Wednesday night and Thursday morning from 625 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...Thunderstorms should continue to intensify this evening
across parts of northeast Montana, while posing a threat for large
to very large hail around 1.5-2.5 inches in diameter, along with
severe/damaging winds up to 65-75 mph.
The severe thunderstorm watch area is approximately along and 120
statute miles east and west of a line from 50 miles north of Glasgow
MT to 95 miles south of Glasgow MT. 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 642...
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 500. Mean storm motion vector
26025.
...Gleason
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW3
WW 643 SEVERE TSTM MT 220025Z - 220700Z
AXIS..120 STATUTE MILES EAST AND WEST OF LINE..
50N GGW/GLASGOW MT/ - 95S GGW/GLASGOW MT/
..AVIATION COORDS.. 105NM E/W /43N GGW - 39NW MLS/
HAIL SURFACE AND ALOFT..2.5 INCHES. WIND GUSTS..65 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 26025.
LAT...LON 48910398 46820408 46820916 48910926
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU3.
Watch 643 Status Report Messages:
STATUS REPORT #2 ON WW 643
VALID 220335Z - 220440Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 30 NNW MLS
TO 20 ENE OLF TO 65 NNE OLF.
..GOSS..08/22/24
ATTN...WFO...TFX...GGW...
&&
STATUS REPORT FOR WS 643
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MTC021-079-083-085-091-109-220440-
MT
. MONTANA COUNTIES INCLUDED ARE
DAWSON PRAIRIE RICHLAND
ROOSEVELT SHERIDAN 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 643
VALID 220300Z - 220440Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 40 SE LWT TO
75 SE HVR TO 75 ENE HVR.
..GOSS..08/22/24
ATTN...WFO...TFX...GGW...
&&
STATUS REPORT FOR WS 643
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MTC019-021-033-055-069-071-079-083-085-091-105-109-220440-
MT
. MONTANA COUNTIES INCLUDED ARE
DANIELS DAWSON GARFIELD
MCCONE PETROLEUM PHILLIPS
PRAIRIE RICHLAND ROOSEVELT
SHERIDAN VALLEY WIBAUX
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
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 (<2%)
|
Wind
Probability of 10 or more severe wind events
|
Mod (40%)
|
Probability of 1 or more wind events > 65 knots
|
Mod (30%)
|
Hail
Probability of 10 or more severe hail events
|
Mod (50%)
|
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.
weather.gov 
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