Alert archive / Montana / Special Weather Statements in 2021

Special Weather Statement, NWS Great Falls, MT

June 3, 2021Cascade County, Montana

NWS Great Falls, MT issued this special weather statement at Jun 3, 2021, 7:11 PM MDT for Cascade County, Montana. It was in force for 49 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 3, 2021, 7:11 PM MDT (01:11 UTC)
Expired: Jun 3, 2021, 8:00 PM MDT
In force: 49 min
Issued by: NWS Great Falls, MT

County Cascade County, MT

The radar

The Great Falls radar (KTFX), 53 km from the middle of the area, began a volume at 01:11 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

Spokane, WA (KOTX), launched 00:00Z, 1.2 hours before the alert went out and 428 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 3300 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: -19 m²/s²
0-3 km storm-relative helicity: 44 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 3, 5:40 PM MDT, 1 hour 31 minutes earlier.

Area forecast discussion, Jun 3, 5:40 PM MDT, 1 hour 31 minutes before

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In the hours before

Special weather statement, Jun 3, 5:47 PM MDT, 1 hour 24 minutes before

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Special weather statement, Jun 3, 6:42 PM MDT, 29 minutes before

Special Weather Statement
National Weather Service Great Falls MT
642 PM MDT Thu Jun 3 2021

MTZ012-013-046-049-040115-
Chouteau MT-Cascade MT-Eastern Teton MT-Eastern Pondera MT-
642 PM MDT Thu Jun 3 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN PONDERA...EAST
CENTRAL TETON...SOUTHWESTERN CHOUTEAU AND NORTHEASTERN CASCADE
COUNTIES UNTIL 715 PM MDT...

At 641 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from 10 miles northeast of Dutton to near Great
Falls. Movement was east at 20 mph.

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

Locations impacted include...
Great Falls, The Knees, Black Eagle, Malmstrom Afb, Floweree and
Portage.

LAT...LON 4813 11120 4744 11085 4739 11147 4799 11172
TIME...MOT...LOC 0041Z 250DEG 15KT 4796 11156 4750 11137

Ludwig

Special weather statement, Jun 3, 7:11 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.

Issued	Product	Office	Counties	Lasted
Jun 3, 6:42 PM MDT	Special Weather Statement	TFX	Cascade	33 min
Jun 3, 7:53 PM MDT	Special Weather Statement	TFX	Judith Basin	52 min
Jun 4, 2:47 PM MDT	Special Weather Statement	TFX	Beaverhead	28 min
Jun 4, 3:10 PM MDT	Special Weather Statement	TFX	Beaverhead	35 min
Jun 4, 3:10 PM MDT	Special Weather Statement	TFX	Meagher	65 min
Jun 4, 3:14 PM MDT	Special Weather Statement	TFX	Beaverhead	31 min
Jun 4, 3:36 PM MDT	Special Weather Statement	TFX	Madison	24 min
Jun 4, 4:03 PM MDT	Special Weather Statement	TFX	Meagher	42 min
Jun 4, 4:10 PM MDT	Special Weather Statement	TFX	Madison	35 min
Jun 4, 4:19 PM MDT	Severe Thunderstorm Warning	TFX	Meagher	26 min
Jun 4, 4:42 PM MDT	Special Weather Statement	TFX	Wheatland	33 min
Jun 4, 4:56 PM MDT	Special Weather Statement	TFX	Judith Basin	34 min
Jun 4, 5:32 PM MDT	Special Weather Statement	TFX	Gallatin	28 min
Jun 4, 5:52 PM MDT	Special Weather Statement	TFX	Fergus, Judith Basin	53 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.