Alert archive / Montana / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 129, NWS Great Falls, MT

August 11, 20194 counties in Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Aug 11, 2019, 3:17 PM MDT for 4 counties in Montana. It was in force for 28 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 11, 2019, 3:17 PM MDT (21:17 UTC)
Expired: Aug 11, 2019, 3:45 PM MDT
In force: 28 min
Issued by: NWS Great Falls, MT
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Broadwater County, MT, Gallatin County, MT, Jefferson County, MT, Madison County, MT

The radar

The Great Falls radar (KTFX), 182 km from the middle of the area, began a volume at 21:19 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 11, 12:34 PM MDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 9.3 hours before the alert went out and 199 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: 660 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 43 m²/s²
0-3 km storm-relative helicity: -127 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Aug 11, 3:03 PM MDT, 14 minutes earlier.

Area forecast discussion, Aug 11, 3:03 PM MDT, 14 minutes before

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In the hours before

Local storm report, Aug 11, 2:56 PM MDT, 21 minutes before

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Local storm report, Aug 11, 3:04 PM MDT, 13 minutes before

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Special weather statement, Aug 11, 3:04 PM MDT, 13 minutes before

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Special weather statement, Aug 11, 3:07 PM MDT, 10 minutes before

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Special weather statement, Aug 11, 3:11 PM MDT, 6 minutes before

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Special weather statement, Aug 11, 3:12 PM MDT, 5 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
Aug 10, 6:08 PM MDT	Special Weather Statement	TFX	Meagher	37 min
Aug 10, 6:14 PM MDT	Severe Thunderstorm Warning	TFX	Broadwater, Jefferson	31 min
Aug 10, 6:16 PM MDT	Severe Thunderstorm Warning	TFX	Broadwater, Meagher	29 min
Aug 10, 6:20 PM MDT	Severe Thunderstorm Warning	TFX	Meagher	25 min
Aug 10, 6:31 PM MDT	Special Weather Statement	TFX	Meagher	29 min
Aug 10, 6:45 PM MDT	Severe Thunderstorm Warning	TFX	Broadwater, Meagher	31 min
Aug 10, 6:50 PM MDT	Severe Thunderstorm Warning	TFX	Broadwater	25 min
Aug 10, 6:55 PM MDT	Special Weather Statement	TFX	Cascade	35 min
Aug 10, 6:58 PM MDT	Special Weather Statement	TFX	Meagher	47 min
Aug 10, 7:12 PM MDT	Severe Thunderstorm Warning	TFX	Broadwater, Gallatin, Meagher	48 min
Aug 10, 7:31 PM MDT	Severe Thunderstorm Warning	TFX	Judith Basin, Meagher	59 min
Aug 10, 7:42 PM MDT	Special Weather Statement	TFX	Jefferson	33 min
Aug 10, 7:53 PM MDT	Severe Thunderstorm Warning	TFX	Gallatin, Meagher	55 min
Aug 10, 7:58 PM MDT	Severe Thunderstorm Warning	TFX	Jefferson, Lewis and Clark	18 min
Aug 10, 8:29 PM MDT	Special Weather Statement	TFX	Broadwater	46 min
Aug 10, 8:40 PM MDT	Special Weather Statement	TFX	Fergus	35 min
Aug 10, 9:05 PM MDT	Special Weather Statement	TFX	Broadwater	25 min
Aug 10, 9:12 PM MDT	Special Weather Statement	TFX	Wheatland	33 min
Aug 10, 9:43 PM MDT	Special Weather Statement	TFX	Fergus	47 min
Aug 10, 9:45 PM MDT	Special Weather Statement	TFX	Meagher	45 min
Aug 11, 2:42 AM MDT	Special Weather Statement	TFX	Deer Lodge	48 min
Aug 11, 5:08 AM MDT	Special Weather Statement	TFX		52 min
Aug 11, 5:56 AM MDT	Special Weather Statement	TFX	Deer Lodge	49 min
Aug 11, 7:45 AM MDT	Special Weather Statement	TFX	Jefferson	30 min
Aug 11, 8:13 AM MDT	Severe Thunderstorm Warning	TFX	Jefferson, Lewis and Clark	32 min
Aug 11, 9:06 AM MDT	Severe Thunderstorm Warning	TFX	Cascade, Lewis and Clark	39 min
Aug 11, 9:43 AM MDT	Special Weather Statement	TFX	Cascade	47 min
Aug 11, 10:16 AM MDT	Special Weather Statement	TFX	Chouteau	44 min
Aug 11, 10:56 AM MDT	Special Weather Statement	TFX	Liberty	49 min
Aug 11, 10:59 AM MDT	Special Weather Statement	TFX	Deer Lodge	16 min
Aug 11, 11:46 AM MDT	Special Weather Statement	TFX	Hill	59 min
Aug 11, 12:11 PM MDT	Special Weather Statement	TFX	Jefferson	19 min
Aug 11, 12:27 PM MDT	Special Weather Statement	TFX	Jefferson	18 min
Aug 11, 12:31 PM MDT	Special Weather Statement	TFX		29 min
Aug 11, 12:44 PM MDT	Special Weather Statement	TFX	Jefferson	31 min
Aug 11, 12:59 PM MDT	Special Weather Statement	TFX	Deer Lodge	46 min
Aug 11, 1:05 PM MDT	Special Weather Statement	TFX	Lewis and Clark	25 min
Aug 11, 1:07 PM MDT	Special Weather Statement	TFX	Beaverhead	8 min
Aug 11, 1:09 PM MDT	Special Weather Statement	TFX	Beaverhead	21 min
Aug 11, 1:15 PM MDT	Special Weather Statement	TFX	Beaverhead	15 min
Aug 11, 1:17 PM MDT	Severe Thunderstorm Warning	TFX	Beaverhead	43 min
Aug 11, 1:18 PM MDT	Special Weather Statement	TFX	Gallatin	42 min
Aug 11, 1:22 PM MDT	Special Weather Statement	TFX	Gallatin	23 min
Aug 11, 1:23 PM MDT	Special Weather Statement	TFX	Cascade	37 min
Aug 11, 1:26 PM MDT	Severe Thunderstorm Warning	TFX	Beaverhead	31 min
Aug 11, 1:38 PM MDT	Special Weather Statement	TFX	Blaine	52 min
Aug 11, 1:53 PM MDT	Severe Thunderstorm Warning	TFX	Beaverhead, Madison	37 min
Aug 11, 1:58 PM MDT	Special Weather Statement	TFX	Gallatin	32 min
Aug 11, 1:59 PM MDT	Special Weather Statement	TFX	Beaverhead	16 min
Aug 11, 2:07 PM MDT	Severe Thunderstorm Warning	TFX	Beaverhead, Madison	38 min
Aug 11, 2:15 PM MDT	Severe Thunderstorm Warning	TFX	Gallatin, Meagher	25 min
Aug 11, 2:20 PM MDT	Special Weather Statement	TFX	Cascade	25 min
Aug 11, 2:23 PM MDT	Severe Thunderstorm Warning	TFX	Madison	52 min
Aug 11, 2:31 PM MDT	Special Weather Statement	TFX	Gallatin	29 min
Aug 11, 2:37 PM MDT	Severe Thunderstorm Warning	TFX	Beaverhead, Madison	38 min
Aug 11, 2:46 PM MDT	Special Weather Statement	TFX	Chouteau	44 min
Aug 11, 2:50 PM MDT	Special Weather Statement	TFX	Meagher	40 min
Aug 11, 3:04 PM MDT	Special Weather Statement	TFX	Blaine	41 min
Aug 11, 3:07 PM MDT	Special Weather Statement	TFX	Blaine	38 min
Aug 11, 3:11 PM MDT	Special Weather Statement	TFX	Gallatin	19 min
Aug 11, 3:12 PM MDT	Special Weather Statement	TFX	Broadwater	18 min
Aug 11, 3:30 PM MDT	Special Weather Statement	TFX	Broadwater	30 min
Aug 11, 3:34 PM MDT	Special Weather Statement	TFX	Chouteau, Judith Basin	41 min
Aug 11, 3:42 PM MDT	Severe Thunderstorm Warning	TFX	Broadwater, Gallatin, Meagher	25 min
Aug 11, 3:48 PM MDT	Special Weather Statement	TFX	Blaine	42 min
Aug 11, 3:53 PM MDT	Special Weather Statement	TFX	Broadwater	22 min
Aug 11, 4:00 PM MDT	Special Weather Statement	TFX	Judith Basin	45 min
Aug 11, 4:03 PM MDT	Special Weather Statement	TFX	Meagher	27 min
Aug 11, 4:11 PM MDT	Special Weather Statement	TFX	Meagher	34 min
Aug 11, 4:26 PM MDT	Special Weather Statement	TFX	Glacier	19 min
Aug 11, 4:29 PM MDT	Special Weather Statement	TFX		46 min
Aug 11, 4:32 PM MDT	Severe Thunderstorm Warning	TFX	Fergus	33 min
Aug 11, 4:37 PM MDT	Special Weather Statement	TFX	Blaine	38 min
Aug 11, 4:47 PM MDT	Special Weather Statement	TFX	Glacier	13 min
Aug 11, 5:01 PM MDT	Special Weather Statement	TFX	Glacier	29 min
Aug 11, 5:08 PM MDT	Severe Thunderstorm Warning	TFX	Fergus	37 min
Aug 11, 5:14 PM MDT	Special Weather Statement	TFX	Blaine	46 min
Aug 11, 5:58 PM MDT	Special Weather Statement	TFX	Blaine	47 min

Nearby

Severe Thunderstorm Warnings in Montana, 2019 Every severe thunderstorm warning 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.