Alert archive / Montana / Special Weather Statements in 2021

Special Weather Statement, NWS Great Falls, MT

August 25, 2021Madison County, Montana

NWS Great Falls, MT issued this special weather statement at Aug 25, 2021, 6:34 PM MDT for Madison County, Montana. It was in force for 26 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
Aug 25, 2021, 6:34 PM MDT (00:34 UTC)
Expired
Aug 25, 2021, 7:00 PM MDT
In force
26 min
Issued by
NWS Great Falls, MT
Hail
0.00 in
Wind
40

County Madison County, MT

The radar

The Pocatello radar (KSFX), 242 km from the middle of the area, began a volume at 00:37 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, 0.6 hours before the alert went out and 270 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 2021-08-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2021-08-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 110 square meters per square second.193958Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2310 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
110 m²/s²
0-3 km storm-relative helicity
191 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 Aug 25, 5:45 PM MDT, 49 minutes earlier.

Area forecast discussion, Aug 25, 5:45 PM MDT, 49 minutes before
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In the hours before

Special weather statement, Aug 25, 4:31 PM MDT, 2 hours 3 minutes before
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Special weather statement, Aug 25, 5:00 PM MDT, 1 hour 34 minutes before
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Special weather statement, Aug 25, 6:27 PM MDT, 7 minutes before
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Special weather statement, Aug 25, 6:34 PM MDT, 0 minutes before
Special Weather Statement
National Weather Service Great Falls MT
634 PM MDT Wed Aug 25 2021

MTZ015-260100-
Madison MT-
634 PM MDT Wed Aug 25 2021

...A strong thunderstorm will impact portions of central Madison
County through 700 PM MDT...

At 633 PM MDT, Doppler radar was tracking a strong thunderstorm 8
miles south of Virginia City, moving northeast at 10 mph.

HAZARD...Winds in excess of 40 mph.

SOURCE...Radar indicated.

IMPACT...Erratic gusty winds could knock down tree limbs and blow
         around unsecured objects.

Locations impacted include...
Virginia City.

This includes Highway 287 between mile markers 40 and 43.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4510 11193 4516 11211 4543 11199 4525 11162
TIME...MOT...LOC 0033Z 224DEG 10KT 4518 11200

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

JAF

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 25, 6:27 PM MDTSpecial Weather StatementTFXJefferson48 min
Aug 25, 8:26 PM MDTSpecial Weather StatementTFXMadison34 min
Aug 25, 8:32 PM MDTSpecial Weather StatementTFXMeagher28 min
Aug 26, 1:10 PM MDTSpecial Weather StatementTFXLewis and Clark35 min
Aug 26, 1:46 PM MDTSpecial Weather StatementTFXLewis and Clark29 min
Aug 26, 2:04 PM MDTSpecial Weather StatementTFXCascade26 min
Aug 26, 2:26 PM MDTSpecial Weather StatementTFXFergus34 min
Aug 26, 2:58 PM MDTSpecial Weather StatementTFXFergus47 min
Aug 26, 3:32 PM MDTSpecial Weather StatementTFXJudith Basin28 min
Aug 26, 3:57 PM MDTSpecial Weather StatementTFXJudith Basin33 min
Aug 26, 4:11 PM MDTSpecial Weather StatementTFXFergus34 min
Aug 26, 4:20 PM MDTSpecial Weather StatementTFXBlaine25 min
Aug 26, 4:31 PM MDTSpecial Weather StatementTFXChouteau29 min
Aug 26, 4:33 PM MDTSpecial Weather StatementTFXFergus27 min
Aug 26, 4:44 PM MDTSpecial Weather StatementTFXFergus31 min
Aug 26, 4:58 PM MDTSpecial Weather StatementTFXFergus32 min
Aug 26, 5:10 PM MDTSpecial Weather StatementTFXFergus35 min
Aug 26, 5:16 PM MDTSpecial Weather StatementTFXChouteau29 min
Aug 26, 5:42 PM MDTSpecial Weather StatementTFXFergus33 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.