Alert archive / Montana / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 71, NWS Great Falls, MT

July 6, 2019Blaine County, Hill County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Jul 6, 2019, 9:58 PM MDT for Blaine County, Hill County, Montana. It was in force for 32 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: Jul 6, 2019, 9:58 PM MDT (03:58 UTC)
Expired: Jul 6, 2019, 10:30 PM MDT
In force: 32 min
Issued by: NWS Great Falls, MT
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Blaine County, MT, Hill County, MT

The radar

The Great Falls radar (KTFX), 182 km from the middle of the area, began a volume at 03:59 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

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 4.0 hours before the alert went out and 220 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: 328 J/kg
Mixed-layer CIN: -92 J/kg
Mixed-layer LCL: 1765 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 78 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 Jul 6, 9:43 PM MDT, 15 minutes earlier.

Area forecast discussion, Jul 6, 9:43 PM MDT, 15 minutes before

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In the hours before

Special weather statement, Jul 6, 8:53 PM MDT, 1 hour 5 minutes before

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Local storm report, Jul 6, 9:06 PM MDT, 52 minutes before

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Special weather statement, Jul 6, 9:17 PM MDT, 41 minutes before

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Special weather statement, Jul 6, 9:20 PM MDT, 38 minutes before

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Special weather statement, Jul 6, 9:38 PM MDT, 20 minutes before

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Special weather statement, Jul 6, 9:44 PM MDT, 14 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
Jul 6, 6:09 PM MDT	Special Weather Statement	TFX	Teton	21 min
Jul 6, 6:10 PM MDT	Severe Thunderstorm Warning	TFX	Meagher	35 min
Jul 6, 6:14 PM MDT	Special Weather Statement	TFX	Broadwater	16 min
Jul 6, 6:18 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Chouteau	27 min
Jul 6, 6:19 PM MDT	Special Weather Statement	TFX	Teton	11 min
Jul 6, 6:35 PM MDT	Special Weather Statement	TFX	Teton	25 min
Jul 6, 6:37 PM MDT	Special Weather Statement	TFX	Judith Basin	23 min
Jul 6, 6:42 PM MDT	Special Weather Statement	TFX	Meagher	48 min
Jul 6, 6:45 PM MDT	Special Weather Statement	TFX	Chouteau	45 min
Jul 6, 6:47 PM MDT	Flash Flood Warning	TFX	Cascade	3 hr
Jul 6, 7:01 PM MDT	Severe Thunderstorm Warning	TFX	Meagher	29 min
Jul 6, 7:21 PM MDT	Severe Thunderstorm Warning	TFX	Meagher	28 min
Jul 6, 7:28 PM MDT	Special Weather Statement	TFX	Fergus	32 min
Jul 6, 7:44 PM MDT	Special Weather Statement	TFX	Judith Basin	46 min
Jul 6, 8:04 PM MDT	Special Weather Statement	TFX	Chouteau	26 min
Jul 6, 8:20 PM MDT	Severe Thunderstorm Warning	TFX	Blaine, Chouteau, Fergus	25 min
Jul 6, 8:45 PM MDT	Special Weather Statement	TFX		30 min
Jul 6, 8:53 PM MDT	Special Weather Statement	TFX		22 min
Jul 6, 8:57 PM MDT	Areal Flood Advisory	TFX	Meagher	3 hr
Jul 6, 9:17 PM MDT	Special Weather Statement	TFX	Blaine	28 min
Jul 6, 9:20 PM MDT	Special Weather Statement	TFX	Fergus	25 min
Jul 6, 9:38 PM MDT	Special Weather Statement	TFX	Blaine	37 min
Jul 6, 9:44 PM MDT	Special Weather Statement	TFX		46 min
Jul 6, 10:32 PM MDT	Special Weather Statement	TFX	Petroleum	43 min
Jul 6, 10:35 PM MDT	Special Weather Statement	TFX	Blaine	25 min
Jul 6, 10:44 PM MDT	Special Weather Statement	TFX	Blaine	31 min
Jul 6, 11:01 PM MDT	Special Weather Statement	TFX	Blaine	29 min
Jul 6, 11:27 PM MDT	Special Weather Statement	TFX	Blaine	33 min
Jul 7, 2:48 AM MDT	Special Weather Statement	TFX		42 min
Jul 7, 3:40 AM MDT	Flash Flood Watch	TFX		16 hr
Jul 7, 4:43 AM MDT	Special Weather Statement	TFX	Toole	47 min
Jul 7, 1:58 PM MDT	Special Weather Statement	TFX	Beaverhead	32 min
Jul 7, 2:22 PM MDT	Special Weather Statement	TFX	Blaine	23 min
Jul 7, 2:24 PM MDT	Special Weather Statement	TFX	Madison	51 min
Jul 7, 2:26 PM MDT	Special Weather Statement	TFX		49 min
Jul 7, 3:02 PM MDT	Special Weather Statement	TFX	Madison	28 min
Jul 7, 3:13 PM MDT	Severe Thunderstorm Warning	TFX	Beaverhead, Madison	32 min
Jul 7, 3:41 PM MDT	Severe Thunderstorm Warning	TFX	Beaverhead, Gallatin, Madison	34 min
Jul 7, 4:16 PM MDT	Special Weather Statement	TFX	Gallatin	44 min
Jul 7, 4:47 PM MDT	Special Weather Statement	TFX	Gallatin	43 min
Jul 7, 4:56 PM MDT	Special Weather Statement	TFX	Lewis and Clark	19 min
Jul 7, 4:59 PM MDT	Special Weather Statement	TFX	Madison	31 min
Jul 7, 5:18 PM MDT	Special Weather Statement	TFX	Lewis and Clark	27 min
Jul 7, 5:26 PM MDT	Special Weather Statement	TFX	Madison	34 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.