Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
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Watch Status Reports.
SEL2
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 492
NWS Storm Prediction Center Norman OK
335 PM MDT Sun Jun 30 2024
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Southwest into Central Montana
* Effective this Sunday afternoon and evening from 335 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 2
inches in diameter possible
SUMMARY...Widely scattered to scattered thunderstorms are forecast
to continue to develop over southwest Montana and move
east-northeast into central Montana late this afternoon into the
evening. A couple of supercells are possible initially with an
attendant risk for large hail (1 to 2 inches in diameter) and severe
gusts. Upscale growth into a linear thunderstorm cluster is
expected by early evening as storms move into the eastern parts of
the Watch. Severe gusts 60-75 mph will be possible with this
activity.
The severe thunderstorm watch area is approximately along and 60
statute miles north and south of a line from 35 miles west southwest
of Bozeman MT to 50 miles north northeast of Billings MT. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU2).
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 489...WW 490...WW 491...
AVIATION...A few severe thunderstorms with hail surface and aloft to
2 inches. Extreme turbulence and surface wind gusts to 65 knots. A
few cumulonimbi with maximum tops to 450. Mean storm motion vector
24040.
...Smith
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW2
WW 492 SEVERE TSTM MT 302135Z - 010200Z
AXIS..60 STATUTE MILES NORTH AND SOUTH OF LINE..
35WSW BZN/BOZEMAN MT/ - 50NNE BIL/BILLINGS MT/
..AVIATION COORDS.. 50NM N/S /37ENE DLN - 45NNE BIL/
HAIL SURFACE AND ALOFT..2 INCHES. WIND GUSTS..65 KNOTS.
MAX TOPS TO 450. MEAN STORM MOTION VECTOR 24040.
LAT...LON 46451182 47340813 45600813 44721182
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU2.
Watch 492 Status Report Messages:
STATUS REPORT #4 ON WW 492
VALID 010145Z - 010240Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 35 E DLN TO
25 NE WEY.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1501.
..GRAMS..07/01/24
ATTN...WFO...TFX...BYZ...
&&
STATUS REPORT FOR WS 492
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MTC057-010240-
MT
. MONTANA COUNTIES INCLUDED ARE
MADISON
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #3 ON WW 492
VALID 010040Z - 010140Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 30 SE BTM TO
25 WSW 3HT TO 30 W LWT.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1501
..WEINMAN..07/01/24
ATTN...WFO...TFX...BYZ...
&&
STATUS REPORT FOR WS 492
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MTC027-031-037-045-057-065-067-095-097-107-111-010140-
MT
. MONTANA COUNTIES INCLUDED ARE
FERGUS GALLATIN GOLDEN VALLEY
JUDITH BASIN MADISON MUSSELSHELL
PARK STILLWATER SWEET GRASS
WHEATLAND YELLOWSTONE
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #2 ON WW 492
VALID 302350Z - 010040Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 E BTM TO
30 WSW 3HT TO 45 W LWT.
..WEINMAN..06/30/24
ATTN...WFO...TFX...BYZ...
&&
STATUS REPORT FOR WS 492
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MTC027-031-037-045-057-065-067-095-097-107-111-010040-
MT
. MONTANA COUNTIES INCLUDED ARE
FERGUS GALLATIN GOLDEN VALLEY
JUDITH BASIN MADISON MUSSELSHELL
PARK STILLWATER SWEET GRASS
WHEATLAND YELLOWSTONE
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #1 ON WW 492
VALID 302240Z - 302340Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..WEINMAN..06/30/24
ATTN...WFO...TFX...BYZ...
&&
STATUS REPORT FOR WS 492
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MTC027-031-037-045-057-059-065-067-095-097-107-111-302340-
MT
. MONTANA COUNTIES INCLUDED ARE
FERGUS GALLATIN GOLDEN VALLEY
JUDITH BASIN MADISON MEAGHER
MUSSELSHELL PARK STILLWATER
SWEET GRASS WHEATLAND 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 (<5%)
|
Probability of 1 or more strong (EF2-EF5) tornadoes
|
Low (<2%)
|
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 (50%)
|
Probability of 1 or more hailstones > 2 inches
|
Mod (30%)
|
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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