Alert archive / Montana / Special Weather Statements in 2019

Special Weather Statement, NWS Great Falls, MT

August 22, 2019

NWS Great Falls, MT issued this special weather statement at Aug 22, 2019, 4:21 PM MDT. It was in force for 24 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 22, 2019, 4:21 PM MDT (22:21 UTC)
Expired: Aug 22, 2019, 4:45 PM MDT
In force: 24 min
Issued by: NWS Great Falls, MT

The radar

The Missoula radar (KMSX), 158 km from the middle of the area, began a volume at 22:23 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

Boise Airport, ID (KBOI), launched 12:00Z, 10.4 hours before the alert went out and 322 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: 1868 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: -12 m²/s²
0-3 km storm-relative helicity: 157 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 22, 1:55 PM MDT, 2 hours 26 minutes earlier.

Area forecast discussion, Aug 22, 1:55 PM MDT, 2 hours 26 minutes before

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In the hours before

Local storm report, Aug 22, 12:31 PM MDT, 3 hours 50 minutes before

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Local storm report, Aug 22, 12:34 PM MDT, 3 hours 47 minutes before

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Local storm report, Aug 22, 2:53 PM MDT, 1 hour 28 minutes before

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Special weather statement, Aug 22, 4:21 PM MDT, 0 minutes before

Special Weather Statement
National Weather Service Great Falls MT
421 PM MDT Thu Aug 22 2019

MTZ008-222245-
Beaverhead MT-
421 PM MDT Thu Aug 22 2019

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN BEAVERHEAD COUNTY
UNTIL 445 PM MDT...

At 421 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from 7 miles north of Wisdom to 10 miles northwest
of Jackson. Movement was southeast at 20 mph.

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

Locations impacted include...
Wisdom and Jackson.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

These storms 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 4582 11353 4580 11343 4575 11336 4578 11336
      4579 11334 4574 11303 4519 11332 4540 11374
TIME...MOT...LOC 2221Z 294DEG 18KT 4572 11346 4544 11360

Moldan

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 21, 6:25 PM MDT	Special Weather Statement	TFX	Teton	35 min
Aug 21, 6:53 PM MDT	Special Weather Statement	TFX	Cascade	7 min
Aug 21, 6:57 PM MDT	Special Weather Statement	TFX	Cascade	33 min
Aug 21, 7:01 PM MDT	Special Weather Statement	TFX	Teton	29 min
Aug 21, 7:17 PM MDT	Severe Thunderstorm Warning	TFX	Cascade	43 min
Aug 21, 7:35 PM MDT	Special Weather Statement	TFX		25 min
Aug 21, 7:54 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Chouteau	31 min
Aug 21, 8:03 PM MDT	Flash Flood Warning	TFX	Cascade	2 hr
Aug 21, 8:04 PM MDT	Special Weather Statement	TFX	Cascade	26 min
Aug 21, 8:11 PM MDT	Special Weather Statement	TFX	Cascade	19 min
Aug 21, 8:27 PM MDT	Special Weather Statement	TFX	Cascade	48 min
Aug 21, 8:28 PM MDT	Special Weather Statement	TFX	Pondera	32 min
Aug 21, 8:52 PM MDT	Special Weather Statement	TFX	Toole	38 min
Aug 21, 8:55 PM MDT	Special Weather Statement	TFX	Chouteau	35 min
Aug 21, 9:34 PM MDT	Special Weather Statement	TFX	Liberty	56 min
Aug 21, 10:26 PM MDT	Special Weather Statement	TFX	Hill	64 min
Aug 21, 10:28 PM MDT	Special Weather Statement	TFX	Liberty	47 min
Aug 21, 11:27 PM MDT	Special Weather Statement	TFX	Hill	48 min
Aug 22, 12:01 AM MDT	Special Weather Statement	TFX	Hill	44 min

Nearby

Special Weather Statements in Montana, 2019 Every special weather statement in 2019

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.