Alert archive / Montana / Special Weather Statements in 2021

Special Weather Statement, NWS Great Falls, MT

June 10, 2021Blaine County, Montana

NWS Great Falls, MT issued this special weather statement at Jun 10, 2021, 2:11 AM MDT for Blaine County, Montana. It was in force for 34 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 10, 2021, 2:11 AM MDT (08:11 UTC)
Expired: Jun 10, 2021, 2:45 AM MDT
In force: 34 min
Issued by: NWS Great Falls, MT

County Blaine County, MT

The radar

The Glasgow radar (KGGW), 139 km from the middle of the area, began a volume at 08:11 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, 8.2 hours before the alert went out and 222 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 22 J/kg
Mixed-layer CIN: -195 J/kg
Mixed-layer LCL: 1287 m above ground
0-6 km bulk shear: 71 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 408 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.1

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 9, 11:50 PM MDT, 2 hours 21 minutes earlier.

Area forecast discussion, Jun 9, 11:50 PM MDT, 2 hours 21 minutes before

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In the hours before

Special weather statement, Jun 9, 10:32 PM MDT, 3 hours 39 minutes before

Special Weather Statement
National Weather Service Great Falls MT
1032 PM MDT Wed Jun 9 2021

MTZ051-100515-
Fergus-
1032 PM MDT Wed Jun 9 2021

...A STRONG THUNDERSTORM WILL AFFECT FERGUS COUNTY...

At 1030 PM MDT, a strong thunderstorm was located 11 miles south of
Lewistown, moving northeast at 25 mph.

Other strong thunderstorms are located around Danvers, Fergus and
Winifred. All of these storms are moving to the around 25 mph as
well.

Any of these storms will be capable of producing wind gusts up to 50
mph, brief heavy rainfall, frequent lightning and half inch hail.

LAT...LON 4731 10859 4727 10860 4727 10872 4710 10874
      4708 10860 4675 10864 4672 10975 4678 10976
      4682 10984 4690 10976 4718 10976 4719 10983
      4768 10980 4761 10844 4757 10834 4759 10832
      4732 10831
TIME...MOT...LOC 0430Z 240DEG 49KT 4690 10944

Brusda

Local storm report, Jun 9, 10:36 PM MDT, 3 hours 35 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREAT FALLS MT
1036 PM MDT WED JUN 9 2021

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

1256 PM     NON-TSTM WND GST 5 ENE DILLON            45.25N 112.55W
06/09/2021  M54 MPH          BEAVERHEAD         MT   ASOS

            ASOS STATION KDLN DILLON AIRPORT.

&&

Local storm report, Jun 9, 11:04 PM MDT, 3 hours 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREAT FALLS MT
1104 PM MDT WED JUN 9 2021

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

1050 PM     HAIL             LEWISTOWN               47.07N 109.43W
06/09/2021  E0.25 INCH       FERGUS             MT   TRAINED SPOTTER

            BRIEF HEAVY RAINFALL AND PEA SIZE HAIL.

&&

BRUSDA

Special weather statement, Jun 9, 11:34 PM MDT, 2 hours 37 minutes before

Special Weather Statement
National Weather Service Great Falls MT
1134 PM MDT Wed Jun 9 2021

MTZ011-013-047-051-100730-
Chouteau-Fergus-Hill-Blaine-
1134 PM MDT Wed Jun 9 2021

...STRONG THUNDERSTORMS WILL AFFECT FERGUS...BLAINE...HILL AND
EASTERN CHOUTEAU COUNTIES OVER THE NEXT TWO HOURS...

At 1131 PM MDT, numerous thunderstorms were located over the
northern half of Fergus County, eastern Chouteau County, and much of
Blaine County, generally moving north or north-northeast at 30 mph.

Winds in excess of 40 mph and half inch hail are possible with these
storms.

Locations impacted include...
Havre, Chinook, Big Sandy, Harlem, Winifred, Parker School, Beaver
Creek, Hays, Azure, Agency, St. Pierre, Gildford, Sangrey, Boneau,
Fort Belknap, Turner, Box Elder, Roy, Fergus and Rocky Boy.

This includes the following highways...
 Highway 2 from Hingham to Phillips County.

If outdoors, seek shelter inside a building should storms approach.

To report severe weather, contact your nearest law enforcement
agency. They can relay your report to the National Weather Service
office in Great Falls.

LAT...LON 4727 10871 4710 10874 4708 10861 4710 10946
      4775 11036 4900 11033 4900 10823 4844 10835
      4844 10842 4798 10843 4799 10860 4792 10889
      4774 10890 4765 10877 4757 10832 4732 10831
TIME...MOT...LOC 0531Z 190DEG 32KT 4785 10975

Kredensor

Local storm report, Jun 9, 11:53 PM MDT, 2 hours 18 minutes before

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Special weather statement, Jun 10, 2:11 AM MDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 9, 6:18 PM MDT	Severe Thunderstorm Warning	TFX	Blaine	42 min
Jun 9, 6:55 PM MDT	Severe Thunderstorm Warning	TFX	Blaine	35 min
Jun 9, 7:08 PM MDT	Special Weather Statement	TFX	Fergus	22 min
Jun 9, 7:19 PM MDT	Special Weather Statement	TFX	Teton	56 min
Jun 9, 7:26 PM MDT	Special Weather Statement	TFX	Fergus	34 min
Jun 9, 7:28 PM MDT	Special Weather Statement	TFX	Judith Basin	32 min
Jun 9, 7:36 PM MDT	Special Weather Statement	TFX	Fergus	24 min
Jun 9, 7:53 PM MDT	Severe Thunderstorm Warning	TFX	Chouteau, Fergus	37 min
Jun 9, 7:57 PM MDT	Special Weather Statement	TFX	Hill	33 min
Jun 9, 8:04 PM MDT	Special Weather Statement	TFX	Judith Basin	26 min
Jun 9, 8:19 PM MDT	Special Weather Statement	TFX	Teton	26 min
Jun 9, 8:28 PM MDT	Severe Thunderstorm Warning	TFX	Chouteau, Judith Basin	32 min
Jun 9, 8:31 PM MDT	Special Weather Statement	TFX	Chouteau	29 min
Jun 9, 8:42 PM MDT	Severe Thunderstorm Warning	TFX	Blaine, Fergus	33 min
Jun 9, 8:45 PM MDT	Special Weather Statement	TFX	Petroleum	30 min
Jun 9, 8:48 PM MDT	Special Weather Statement	TFX	Hill	27 min
Jun 9, 8:57 PM MDT	Special Weather Statement	TFX	Blaine	18 min
Jun 9, 9:04 PM MDT	Severe Thunderstorm Warning	TFX	Chouteau, Hill	26 min
Jun 9, 9:09 PM MDT	Severe Thunderstorm Warning	TFX	Blaine, Fergus	21 min
Jun 9, 9:18 PM MDT	Special Weather Statement	TFX	Toole	42 min
Jun 9, 9:26 PM MDT	Special Weather Statement	TFX	Blaine	49 min
Jun 9, 9:30 PM MDT	Severe Thunderstorm Warning	TFX	Blaine	45 min
Jun 9, 9:37 PM MDT	Special Weather Statement	TFX	Blaine	23 min
Jun 9, 9:38 PM MDT	Special Weather Statement	TFX	Fergus	37 min
Jun 9, 9:38 PM MDT	Severe Thunderstorm Warning	TFX	Blaine	40 min
Jun 9, 9:51 PM MDT	Special Weather Statement	TFX	Blaine	24 min
Jun 9, 10:17 PM MDT	Special Weather Statement	TFX	Blaine	28 min
Jun 9, 10:32 PM MDT	Special Weather Statement	TFX	Fergus	43 min
Jun 9, 10:48 PM MDT	Severe Thunderstorm Warning	TFX	Blaine	42 min
Jun 9, 11:34 PM MDT	Special Weather Statement	TFX	Blaine, Fergus, Hill	116 min
Jun 10, 2:53 PM MDT	Special Weather Statement	TFX	Fergus	37 min
Jun 10, 3:08 PM MDT	Severe Thunderstorm Warning	TFX	Fergus	52 min
Jun 10, 3:53 PM MDT	Special Weather Statement	TFX	Fergus	37 min
Jun 10, 4:22 PM MDT	Special Weather Statement	TFX	Cascade	23 min
Jun 10, 4:56 PM MDT	Special Weather Statement	TFX	Cascade	34 min
Jun 10, 5:33 PM MDT	Special Weather Statement	TFX	Cascade	27 min

Nearby

Special Weather Statements in Montana, 2021 Every 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.