Alert archive / Montana / Special Weather Statements in 2021

Special Weather Statement, NWS Great Falls, MT

July 6, 2021Glacier County, Montana

NWS Great Falls, MT issued this special weather statement at Jul 6, 2021, 3:55 PM MDT for Glacier County, Montana. It was in force for 35 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: Jul 6, 2021, 3:55 PM MDT (21:55 UTC)
Expired: Jul 6, 2021, 4:30 PM MDT
In force: 35 min
Issued by: NWS Great Falls, MT

County Glacier County, MT

The radar

The Great Falls radar (KTFX), 199 km from the middle of the area, began a volume at 21:57 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 12:00Z, 9.9 hours before the alert went out and 237 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: 103 J/kg
Mixed-layer CIN: -251 J/kg
Mixed-layer LCL: 1154 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 134 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 Jul 6, 2:36 PM MDT, 1 hour 19 minutes earlier.

Area forecast discussion, Jul 6, 2:36 PM MDT, 1 hour 19 minutes before

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In the hours before

Special weather statement, Jul 6, 3:37 PM MDT, 18 minutes before

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Special weather statement, Jul 6, 3:55 PM MDT, 0 minutes before

Special Weather Statement
National Weather Service Great Falls MT
355 PM MDT Tue Jul 6 2021

MTZ010-062230-
Eastern Glacier-
355 PM MDT Tue Jul 6 2021

...A STRONG THUNDERSTORM WILL AFFECT NORTH CENTRAL GLACIER COUNTY...

At 354 PM MDT, a strong thunderstorm was located 25 miles north of
North Browning, or 36 miles northwest of Cut Bank, moving east at 15
mph.

Winds up to 40 mph and pea size hail are possible with this storm.

This storm will remain over mainly rural areas of north central
Glacier County.

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 4899 11288 4900 11268 4879 11268 4891 11310
      4900 11309
TIME...MOT...LOC 2154Z 280DEG 15KT 4894 11297

RCG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 5, 6:29 PM MDT	Special Weather Statement	TFX	Gallatin, Madison	31 min
Jul 5, 7:04 PM MDT	Special Weather Statement	TFX	Gallatin	26 min
Jul 5, 7:47 PM MDT	Special Weather Statement	TFX	Beaverhead	28 min
Jul 5, 9:16 PM MDT	Special Weather Statement	TFX	Glacier	44 min
Jul 5, 9:57 PM MDT	Severe Thunderstorm Warning	TFX	Glacier	33 min
Jul 5, 10:25 PM MDT	Severe Thunderstorm Warning	TFX	Glacier, Toole	50 min
Jul 5, 11:12 PM MDT	Special Weather Statement	TFX	Toole	63 min
Jul 6, 12:14 AM MDT	Special Weather Statement	TFX	Liberty	61 min
Jul 6, 12:42 AM MDT	Special Weather Statement	TFX	Chouteau	33 min
Jul 6, 1:15 AM MDT	Special Weather Statement	TFX	Liberty	60 min
Jul 6, 1:18 AM MDT	Special Weather Statement	TFX	Chouteau	27 min
Jul 6, 1:44 AM MDT	Special Weather Statement	TFX	Chouteau	46 min
Jul 6, 2:22 AM MDT	Special Weather Statement	TFX	Chouteau	38 min
Jul 6, 3:00 AM MDT	Special Weather Statement	TFX	Chouteau	45 min
Jul 6, 3:42 AM MDT	Special Weather Statement	TFX	Fergus	33 min
Jul 6, 4:15 AM MDT	Special Weather Statement	TFX	Fergus	45 min
Jul 6, 3:37 PM MDT	Special Weather Statement	TFX	Glacier	23 min
Jul 6, 4:21 PM MDT	Special Weather Statement	TFX	Glacier	24 min
Jul 6, 4:27 PM MDT	Special Weather Statement	TFX	Musselshell	33 min
Jul 6, 4:37 PM MDT	Special Weather Statement	TFX	Fergus	23 min
Jul 6, 4:40 PM MDT	Severe Thunderstorm Warning	TFX	Glacier	35 min
Jul 6, 4:42 PM MDT	Special Weather Statement	TFX	Blaine	33 min
Jul 6, 5:14 PM MDT	Severe Thunderstorm Warning	TFX	Glacier, Toole	31 min
Jul 6, 5:15 PM MDT	Special Weather Statement	TFX	Blaine	30 min
Jul 6, 5:45 PM MDT	Special Weather Statement	TFX	Toole	30 min
Jul 6, 5:46 PM MDT	Severe Thunderstorm Warning	TFX	Blaine	29 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.