Severe Thunderstorm Warning 66, NWS Glasgow, MT

704 
WWUS55 KGGW 081941
SVSGGW

Severe Weather Statement
National Weather Service Glasgow MT
141 PM MDT Thu Jul 8 2021

MTC071-105-082015-
/O.CON.KGGW.SV.W.0066.000000T0000Z-210708T2015Z/
Phillips MT-Valley MT-
141 PM MDT Thu Jul 8 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 215 PM MDT
FOR NORTHEASTERN PHILLIPS AND NORTHWESTERN VALLEY COUNTIES...

At 141 PM MDT, a severe thunderstorm was located near Whitewater,
moving southeast at 25 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Whitewater and Frenchman Reservoir. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4877 10783 4899 10759 4898 10696 4860 10718
TIME...MOT...LOC 1941Z 301DEG 22KT 4880 10758 

HAIL...1.00IN
WIND...60MPH
 
$$

NWS Glasgow

Area Forecast Discussion...UPDATED
National Weather Service Glasgow MT
1015 AM MDT Thu Jul 8 2021

.DISCUSSION...

In preparation for expected severe thunderstorms this afternoon
and evening, I made some updates and adjustments to the forecast.
SPC has upgraded our eastern zones with an enhanced risk area and
5 percent tornado area. Some isolated thunderstorms are already
setting off over areas associated with the surface low pressure
trough. I chose to increase PoPs to 100 percent for areas most
likely to see precipitation today. Time frame for greatest impact
seems to be between 2 PM and 9 PM. We will likely transition into
severe weather operations early this afternoon.

Previous discussion: Area thunderstorms are lurking just north of
the Canadian border near Daniels and Sheridan Counties early this
morning. This will bring to attention the main concern for today
with severe weather potential across portions of NE Montana. The
best timing will be from 2-8PM today, with large hail and damaging
winds a possibility based on convective parameters, though
ensembles suggest locally heavy rainfall may also be possible,
particular in the northeast.

Warm, dry, and breezy conditions may elevate fire weather concerns
in the southwest, but winds may not be high enough for critical
fire weather conditions. It also should be stated clearly that
fire starts are possible from any lightning that occurs with
thunderstorms.

Scattered storms will again be possible on Friday before upper
ridging leads to drier and notably hotter weather conditions by
the weekend. On Sunday, high temperatures will be well into the
90s for most of the CWA, and may approach 100 degrees for some.

&&

.AVIATION...

PATTERN: The atmosphere is primed for severe thunderstorms with a
surface low pressure trough, significant moisture, and a favorable
wind field. Expect thunderstorms coverage and intensity to
strengthen this afternoon and evening, especially east of MT-
Highway 24.

FLIGHT CONDITIONS: Mainly VFR, then briefly LIFR for NE MT TAF
sites if a thunderstorm happens to pass directly overhead.
Amendments may be needed.

WINDS: Light and variable early, then erratic and gusty this
afternoon and evening near the stronger storms. After about 03Z,
becoming light and variable again.

&&

.GLASGOW WATCHES/WARNINGS/ADVISORIES...NONE.

&&

weather.gov/glasgow

Special Weather Statement
National Weather Service Glasgow MT
1237 PM MDT Thu Jul 8 2021

MTZ016-017-022-060-081915-
Garfield MT-Southwest Phillips MT-Central and Southeast Phillips MT-
Central and Southern Valley MT-
1237 PM MDT Thu Jul 8 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN PHILLIPS...WEST
CENTRAL GARFIELD AND SOUTHWESTERN VALLEY COUNTIES UNTIL 115 PM MDT...

At 1236 PM MDT, Doppler radar was tracking a strong thunderstorm 9
miles northwest of Fourchette, or 21 miles east of Zortman, moving
east at 35 mph.

Nickel size hail and wind gusts up to 50 mph will be possible with
this storm.

Locations impacted include...
Fourchette, Devils Creek Rec Area and Sun Prairie.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 4778 10823 4795 10813 4777 10732 4752 10747
TIME...MOT...LOC 1836Z 292DEG 32KT 4784 10808

NWS Glasgow