Alert archive / Montana / Special Weather Statements in 2021

Special Weather Statement, NWS Great Falls, MT

June 4, 2021Fergus County, Montana

NWS Great Falls, MT issued this special weather statement at Jun 4, 2021, 9:22 PM MDT for Fergus County, Montana. It was in force for 53 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jun 4, 2021, 9:22 PM MDT (03:22 UTC)
Expired
Jun 4, 2021, 10:15 PM MDT
In force
53 min
Issued by
NWS Great Falls, MT

County Fergus County, MT

The radar

The Billings radar (KBLX), 145 km from the middle of the area, began a volume at 03:26 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 nearest sounding before it

Great_falls, MT (KTFX), launched 00:00Z, 3.4 hours before the alert went out and 142 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Great_falls, MT at 00:00Z on 2021-06-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 460 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Great_falls, MT at 00:00Z on 2021-06-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 10 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
460 J/kg
Mixed-layer CIN
-28 J/kg
Mixed-layer LCL
2772 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
10 m²/s²
0-3 km storm-relative helicity
121 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.2

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

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

NWS Great Falls, MT wrote its last area forecast discussion before this special weather statement went out at Jun 4, 8:47 PM MDT, 35 minutes earlier.

Area forecast discussion, Jun 4, 8:47 PM MDT, 35 minutes before
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In the hours before

Special weather statement, Jun 4, 4:42 PM MDT, 4 hours 40 minutes before
Special Weather Statement
National Weather Service Great Falls MT
442 PM MDT Fri Jun 4 2021

MTZ054-042315-
Meagher MT-
442 PM MDT Fri Jun 4 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN MEAGHER COUNTY UNTIL
515 PM MDT...

At 441 PM MDT, Doppler radar was tracking a strong thunderstorm 25
miles north of Clyde Park, or 29 miles southeast of White Sulphur
Springs, moving east at 40 mph.

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

This storm will remain over mainly rural areas of southeastern
Meagher County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

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.

&&

A Severe Thunderstorm Watch remains in effect until 1100 PM MDT for
central Montana.

LAT...LON 4619 11029 4619 11056 4632 11056 4637 11028
TIME...MOT...LOC 2241Z 266DEG 35KT 4624 11046

RCG
Special weather statement, Jun 4, 4:56 PM MDT, 4 hours 26 minutes before
Special Weather Statement
National Weather Service Great Falls MT
456 PM MDT Fri Jun 4 2021

MTZ050-042330-
Judith Basin MT-
456 PM MDT Fri Jun 4 2021

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL JUDITH BASIN COUNTY
UNTIL 530 PM MDT...

At 455 PM MDT, Doppler radar was tracking a strong thunderstorm near
Stanford, moving east at 30 mph.

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

Locations impacted include...
Stanford, Windham and Benchland.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

&&

A Severe Thunderstorm Watch remains in effect until 1100 PM MDT for
central Montana.

LAT...LON 4703 11038 4718 11047 4732 11013 4727 11012
      4727 11000 4723 10999 4723 10988 4719 10987
      4718 10985 4709 10978
TIME...MOT...LOC 2255Z 248DEG 28KT 4714 11029

RCG
Special weather statement, Jun 4, 5:32 PM MDT, 3 hours 50 minutes before
Special Weather Statement
National Weather Service Great Falls MT
532 PM MDT Fri Jun 4 2021

MTZ055-050000-
Gallatin MT-
532 PM MDT Fri Jun 4 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN GALLATIN COUNTY
UNTIL 600 PM MDT...

At 530 PM MDT, Doppler radar was tracking a strong thunderstorm near
Bozeman, moving northeast at 30 mph.

Pea size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Bozeman, Belgrade, Manhattan, Four Corners, Amsterdam, Bozeman Hot
Springs, Gallatin Gateway, Church Hill and Menard.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4551 11136 4564 11135 4565 11138 4608 11130
      4593 11079 4580 11079 4542 11107
TIME...MOT...LOC 2330Z 202DEG 30KT 4566 11118

RCG
Special weather statement, Jun 4, 5:52 PM MDT, 3 hours 30 minutes before
Special Weather Statement
National Weather Service Great Falls MT
552 PM MDT Fri Jun 4 2021

MTZ050-051-050045-
Fergus MT-Judith Basin MT-
552 PM MDT Fri Jun 4 2021

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL JUDITH BASIN...CENTRAL
FERGUS AND SOUTHERN BLAINE COUNTIES UNTIL 645 PM MDT...

At 551 PM MDT, Doppler radar was tracking a cluster of strong
thunderstorms along a line extending from 16 miles west of Winifred
to 9 miles southeast of Denton to 12 miles southwest of Stanford.
Movement was northeast at 45 mph.

Half inch hail and winds in excess of 40 mph will be possible with
these storms.

Locations impacted include...
Lewistown, Hobson, Winifred, Moore, Windham, Moccasin, Ackley Lake
State Park, Glengarry, Utica, Danvers, Suffolk, Giltedge, Hilger,
Heath, Christina and Benchland.

A Severe Thunderstorm Watch remains in effect until 1100 PM MDT for
central Montana.

LAT...LON 4768 10891 4687 10929 4696 11059 4716 10992
      4757 10979 4774 10950 4772 10943 4780 10927
      4778 10913 4781 10898 4779 10894 4775 10892
      4774 10895 4773 10889
TIME...MOT...LOC 2351Z 232DEG 40KT 4754 10974 4720 10985 4703 11042

Ludwig
Special weather statement, Jun 4, 7:41 PM MDT, 1 hour 41 minutes before
Special Weather Statement
National Weather Service Great Falls MT
741 PM MDT Fri Jun 4 2021

MTZ047-050215-
Blaine MT-
741 PM MDT Fri Jun 4 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN BLAINE COUNTY UNTIL
815 PM MDT...

At 741 PM MDT, Doppler radar was tracking a strong thunderstorm near
Hays, or 13 miles northwest of Zortman, moving east at 35 mph.

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

Locations impacted include...
Hays and Lodge Pole.

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 4802 10844 4796 10873 4813 10882 4827 10842
TIME...MOT...LOC 0141Z 248DEG 31KT 4808 10867

Ludwig
Special weather statement, Jun 4, 9:22 PM MDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jun 4, 7:41 PM MDTSpecial Weather StatementTFXBlaine34 min
Jun 4, 9:30 PM MDTSevere Thunderstorm WarningTFXGallatin33 min
Jun 4, 9:36 PM MDTSpecial Weather StatementTFXGallatin24 min
Jun 4, 9:45 PM MDTSevere Thunderstorm WarningTFXFergus45 min
Jun 4, 10:45 PM MDTSpecial Weather StatementTFXFergus45 min
Jun 5, 1:18 PM MDTSpecial Weather StatementTFXMadison27 min
Jun 5, 5:08 PM MDTSpecial Weather StatementTFXJudith Basin37 min

Nearby

Special Weather Statements in Montana, 2021Every special weather statement in 2021

Sources

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