Alert archive / Montana / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 48, NWS Glasgow, MT

July 7, 20208 counties in Montana

NWS Glasgow, MT issued this severe thunderstorm warning at Jul 7, 2020, 5:25 PM MDT for 8 counties in Montana. It was in force for 65 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 7, 2020, 5:25 PM MDT (23:25 UTC)
Expired: Jul 7, 2020, 6:30 PM MDT
In force: 65 min
Issued by: NWS Glasgow, MT
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 80.0 mph

Counties Dawson County, MT, Garfield County, MT, McCone County, MT, Petroleum County, MT, Phillips County, MT, Prairie County, MT, Roosevelt County, MT, Valley County, MT

The radar

The Glasgow radar (KGGW), 66 km from the middle of the area, began a volume at 23:24 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 7, 1:14 PM MDT	Severe Thunderstorm Watch	SPC	8 hr

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Glasgow, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 7, 1:15 PM MDT, 4 hours 10 minutes earlier.

Area forecast discussion, Jul 7, 1:15 PM MDT, 4 hours 10 minutes before

Area Forecast Discussion
National Weather Service Glasgow MT
115 PM MDT Tue Jul 7 2020

.DISCUSSION...
A widespread severe weather event is on track for all of
Northeast Montana from late afternoon through the evening hours.
Storms are forming across the higher terrain in central and
southwest Montana and will progress eastward into Northeast
Montana. Storms may be semi-discrete initially as they enter
Phillips and Petroleum Counties. If they are able to remain
discrete then very large hail to the size of baseballs, damaging
winds in excess of 70 mph, and an isolated tornado will be
possible.

Once the storms merge into one or more line segments destructive
wind gusts in excess of 70 to 80 mph will become the primary
threat. Look for this main line of storms to arrive in Phillips
and Petroleum Counties around 4 or 5 PM, Opheim to Glasgow to
Jordan around 6 to 7 PM, and the ND border by 9 to 10 PM or so.

It is possible a few isolated storms could enter the Yellowstone
River Valley ahead of this primary line of storms during the early
evening hours. If this were to happen, all severe modes would be
possible.

An upper trough moves across the state on Wednesday with slightly
cooler and generally drier weather. A few storms are possible
near the Canadian border with the proximity of a stacked low
pressure system moving from Saskatchewan into Manitoba.

Ridge then builds north from the Desert Southwest for hot and dry
weather for the remainder of the week. Could see a few
thunderstorms on Friday as a shortwave pushes through the top of
the ridge.

-Mottice/RAE

&&

.AVIATION...
A line of severe storms should reach KGGW around 00-01Z, KOLF
01-02z, and KGDV and KSDY between 02 and 03z this evening. This
line of storms will bring intense and erratic winds as well as
hail, heavy rain, and brief IFR conditions.

Skies should be clearing out by 06z for much of the region.

&&

.GLASGOW WATCHES/WARNINGS/ADVISORIES...
Lake Wind Advisory until 10 PM MDT this evening For Fort Peck
Lake for Central and Southeast Phillips...Central and Southern
Valley...Garfield...McCone...Petroleum.

&&

weather.gov/glasgow

In the hours before

Local storm report, Jul 7, 4:36 PM MDT, 49 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GLASGOW MT
436 PM MDT TUE JUL 7 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0430 PM     TSTM WND GST     11 ENE ZORTMAN          47.96N 108.31W
07/07/2020  M63 MPH          PHILLIPS           MT   MESONET

            MESONET STATION MTMAL 11.3 SW PHILLIPS (MT
            DOT).

&&

Local storm report, Jul 7, 4:38 PM MDT, 47 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GLASGOW MT
438 PM MDT TUE JUL 7 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0404 PM     TSTM WND GST     1 N LANDUSKY            47.92N 108.62W
07/07/2020  M55 MPH          PHILLIPS           MT   MESONET

            MESONET STATION FW7047 LANDUSKY.

&&

Local storm report, Jul 7, 4:49 PM MDT, 36 minutes before

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Local storm report, Jul 7, 4:57 PM MDT, 28 minutes before

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Local storm report, Jul 7, 5:07 PM MDT, 18 minutes before

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Local storm report, Jul 7, 5:14 PM MDT, 11 minutes before

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The office that day

Everything else NWS Glasgow, MT issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 7, 9:52 AM MDT	Lake Wind Advisory	GGW	Garfield, McCone, Petroleum, Phillips, Valley	11 hr
Jul 7, 3:47 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, Petroleum, Phillips	58 min
Jul 7, 4:10 PM MDT	Tornado Warning Tornado observed	GGW	Petroleum	38 min
Jul 7, 4:33 PM MDT	Severe Thunderstorm Warning	GGW	Phillips	57 min
Jul 7, 4:46 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, Petroleum, Phillips, Valley	59 min
Jul 7, 4:53 PM MDT	Tornado Warning	GGW	Phillips, Valley	23 min
Jul 7, 5:12 PM MDT	Severe Thunderstorm Warning	GGW	Daniels, Phillips, Roosevelt, Valley	63 min

Nearby

Severe Thunderstorm Warnings in Montana, 2020 Every severe thunderstorm warning in 2020

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.