Alert archive / Montana / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 63, NWS Great Falls, MT

July 17, 2013Beaverhead County, Madison County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Jul 17, 2013, 4:31 PM MDT for Beaverhead County, Madison County, Montana. It was in force for 44 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 17, 2013, 4:31 PM MDT (22:31 UTC)
Expired: Jul 17, 2013, 5:15 PM MDT
In force: 44 min
Issued by: NWS Great Falls, MT
Area: Storm-based polygon

Counties Beaverhead County, MT, Madison County, MT

The radar

The Pocatello radar (KSFX), 236 km from the middle of the area, began a volume at 22:33 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
Jul 17, 2:48 PM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 10.5 hours before the alert went out and 285 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: 1289 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: -14 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 17, 3:01 PM MDT, 1 hour 30 minutes earlier.

Area forecast discussion, Jul 17, 3:01 PM MDT, 1 hour 30 minutes before

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Hazardous weather outlook, Jul 17, 4:16 AM MDT, 12 hours 15 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GREAT FALLS MT
416 AM MDT WED JUL 17 2013

MTZ008>015-044>055-181030-
BEAVERHEAD-NORTHERN ROCKY MOUNTAIN FRONT-EASTERN GLACIER-HILL-
CASCADE-CHOUTEAU-CENTRAL AND SOUTHERN LEWIS AND CLARK-MADISON-
TOOLE-LIBERTY-EASTERN PONDERA-BLAINE-
SOUTHERN ROCKY MOUNTAIN FRONT-EASTERN TETON-JUDITH BASIN-FERGUS-
JEFFERSON-BROADWATER-MEAGHER-GALLATIN-
416 AM MDT WED JUL 17 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL
MONTANA...NORTH CENTRAL MONTANA AND SOUTHWEST MONTANA.

.DAY ONE...TODAY AND TONIGHT

STRONG TO SEVERE THUNDERSTORMS WITH STRONG TO DAMAGING WINDS...HAIL
AND LOCALLY HEAVY RAIN ARE EXPECTED THIS AFTERNOON AND EVENING.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

THE PROBABILITY IS LOW FOR WIDESPREAD HAZARDOUS WEATHER.

.SPOTTER INFORMATION STATEMENT...

ANY REPORTS OF STRONG WINDS...HAIL AND/OR STORM DAMAGE WOULD BE
GREATLY APPRECIATED AND CAN BE RELAYED TO THE NWS GREAT FALLS OR
LOCAL LAW ENFORCEMENT.

In the hours before

Special weather statement, Jul 17, 3:19 PM MDT, 1 hour 12 minutes before

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Special weather statement, Jul 17, 3:19 PM MDT, 1 hour 12 minutes before

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Special weather statement, Jul 17, 3:59 PM MDT, 32 minutes before

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Special weather statement, Jul 17, 4:02 PM MDT, 29 minutes before

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Special weather statement, Jul 17, 4:07 PM MDT, 24 minutes before

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Special weather statement, Jul 17, 4:30 PM MDT, 1 minute 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 17, 2:53 PM MDT	Special Weather Statement	TFX	Madison	52 min
Jul 17, 3:19 PM MDT	Special Weather Statement	TFX		41 min
Jul 17, 3:59 PM MDT	Special Weather Statement	TFX	Beaverhead	46 min
Jul 17, 4:02 PM MDT	Special Weather Statement	TFX	Beaverhead	43 min
Jul 17, 4:07 PM MDT	Special Weather Statement	TFX	Madison	38 min
Jul 17, 4:23 PM MDT	Severe Thunderstorm Warning	TFX	Lewis and Clark	37 min
Jul 17, 4:30 PM MDT	Special Weather Statement	TFX	Lewis and Clark	45 min
Jul 17, 4:44 PM MDT	Special Weather Statement	TFX	Broadwater	46 min
Jul 17, 4:51 PM MDT	Special Weather Statement	TFX	Madison	39 min
Jul 17, 4:52 PM MDT	Special Weather Statement	TFX	Silver Bow	38 min
Jul 17, 5:00 PM MDT	Severe Thunderstorm Warning	TFX	Gallatin, Madison	45 min
Jul 17, 5:20 PM MDT	Special Weather Statement	TFX	Lewis and Clark	40 min
Jul 17, 5:43 PM MDT	Areal Flood Advisory	TFX	Jefferson, Lewis and Clark	6 hr
Jul 17, 5:45 PM MDT	Special Weather Statement	TFX	Pondera	45 min
Jul 17, 5:46 PM MDT	Special Weather Statement	TFX	Gallatin	44 min

Nearby

Severe Thunderstorm Warnings in Montana, 2013 Every severe thunderstorm warning in 2013

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.