Alert archive / Montana / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 37, NWS Glasgow, MT

August 12, 2017Prairie County, Montana

NWS Glasgow, MT issued this severe thunderstorm warning at Aug 12, 2017, 3:05 PM MDT for Prairie County, Montana. It was in force for 23 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: Aug 12, 2017, 3:05 PM MDT (21:05 UTC)
Expired: Aug 12, 2017, 3:28 PM MDT
In force: 23 min
Issued by: NWS Glasgow, MT
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Prairie County, MT

The radar

The Glasgow radar (KGGW), 176 km from the middle of the area, began a volume at 21:07 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.

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 Aug 12, 2:17 PM MDT, 48 minutes earlier.

Area forecast discussion, Aug 12, 2:17 PM MDT, 48 minutes before

Area Forecast Discussion
National Weather Service Glasgow MT
217 PM MDT Sat Aug 12 2017

.SHORT TERM...for northeast Montana...tonight through Sun...

Departing upper low could still generate a few rain showers and
thunderstorms over eastern counties before it fully exits the
region later this evening. The strongest CAPE and LI shift further
to the southeast, so not expected many strong storms.

After midnight and through Sunday, the main influence on the
forecast will be a narrow, but amplified upper ridge east of the
Divide. Most of the cloud cover from the departing trough will
leave the area Sunday for a sunny day. With increasing heights,
and thermal ridge developing east of the Front Range, temperatures
will nudge up closer to normal - most highs in the 80s.

There had been some concern for the wind, due to numerous
activities on Fort Peck Lake. But, models are not identifying any
concerns for now. So, no planned wind headlines.

Templer

.LONG TERM...Sun night through Sat...

Little change in thinking has occurred from the previous long
term discussion. The upper trough over British Columbia will
extend into the Pacific Northwest Sunday night. A local vorticity
maxima out ahead of that trough will eject toward eastern MT on
southwest flow aloft. This will increase chances for showers and
thunderstorms across the area into Monday.

The main trough axis will shift east as the feature deepens, with
a second round of showers and thunderstorms occurring Monday night
into early Tuesday. Confidence on details remains slightly below
average until some of the mesoscale and thermodynamic profiles as
this system enters the short term.

Beyond the midweek, forecast elements were trended toward the
latest consensus model blends given increasing spread in ensemble
500mb heights. Maliawco

&&

.AVIATION...

VFR mostly, possible MVFR ceilings/fog in the morning for eastern
terminal areas due to lingering RH.

Isolated thunderstorm are possible this evening as the upper-level
trough moves farther east. Then a narrow upper level ridge move
over the region by morning to bring dry conditions and mostly
clear skies.

Wind: east at 5-15kt.

Templer

&&

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

&&

weather.gov/glasgow

In the hours before

Special weather statement, Aug 12, 1:50 PM MDT, 1 hour 15 minutes before

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Special weather statement, Aug 12, 2:32 PM MDT, 33 minutes before

Special Weather Statement
National Weather Service Glasgow MT
232 PM MDT SAT AUG 12 2017

MTZ025-026-122130-
Dawson MT-Prairie MT-
232 PM MDT SAT AUG 12 2017

...SIGNIFICANT WEATHER ADVISORY FOR PRAIRIE AND SOUTHWESTERN DAWSON
COUNTIES UNTIL 330 PM MDT...

At 231 PM MDT, Doppler radar was tracking a strong thunderstorm near
Terry, moving southeast at 30 mph.

Half inch hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Terry, Fallon, Mildred, Zero, Mccloud and Calypso.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4657 10524 4657 10545 4660 10545 4660 10549
      4666 10549 4666 10558 4674 10558 4675 10562
      4683 10562 4683 10576 4688 10580 4711 10526
      4661 10474 4661 10486 4657 10486 4657 10498
      4654 10499 4654 10524
TIME...MOT...LOC 2031Z 323DEG 27KT 4687 10541

Hickford

Special weather statement, Aug 12, 2:52 PM MDT, 13 minutes before

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Local storm report, Aug 12, 2:59 PM MDT, 6 minutes before

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Local storm report, Aug 12, 3:00 PM MDT, 5 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
Aug 11, 6:12 PM MDT	Severe Thunderstorm Warning	GGW	Richland, Wibaux	63 min
Aug 11, 7:18 PM MDT	Severe Thunderstorm Warning	GGW	Richland, Wibaux	27 min
Aug 12, 1:50 PM MDT	Special Weather Statement	GGW	Wibaux	55 min
Aug 12, 2:32 PM MDT	Special Weather Statement	GGW	Prairie	58 min
Aug 12, 2:52 PM MDT	Special Weather Statement	GGW	Wibaux	23 min
Aug 12, 4:06 PM MDT	Special Weather Statement	GGW	Prairie	54 min

Nearby

Severe Thunderstorm Warnings in Montana, 2017 Every severe thunderstorm warning in 2017

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.