Alert archive / Montana / Special Weather Statements in 2012

Special Weather Statement, NWS Great Falls, MT

July 11, 2012Jefferson County, Montana

NWS Great Falls, MT issued this special weather statement at Jul 11, 2012, 2:52 PM MDT for Jefferson County, Montana. It was in force for 23 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: Jul 11, 2012, 2:52 PM MDT (20:52 UTC)
Expired: Jul 11, 2012, 3:15 PM MDT
In force: 23 min
Issued by: NWS Great Falls, MT

County Jefferson County, MT

The nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 8.9 hours before the alert went out and 183 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: 386 J/kg
Mixed-layer CIN: -190 J/kg
Mixed-layer LCL: 2234 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: -35 m²/s²
0-3 km storm-relative helicity: -3 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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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 Jul 11, 2:52 PM MDT, 0 minutes earlier.

Area forecast discussion, Jul 11, 2:52 PM MDT, 0 minutes before

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Hazardous weather outlook, Jul 11, 4:35 AM MDT, 10 hours 17 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GREAT FALLS MT
435 AM MDT WED JUL 11 2012

MTZ015-054-055-121200-
MADISON-MEAGHER-GALLATIN-
435 AM MDT WED JUL 11 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST
MONTANA.

.DAY ONE...TODAY AND TONIGHT

RED FLAG WARNINGS HAVE BEEN ISSUED FOR PORTIONS OF SOUTHWEST
MONTANA AND FAR SOUTHERN PORTIONS OF MEAGHER COUNTY. SCATTERED
WET AND DRY THUNDERSTORMS PRODUCING STRONG AND VARIABLE WIND GUSTS
ARE EXPECTED THIS AFTERNOON AND EVENING. LIGHTING STRIKES...LOW
RELATIVE HUMIDITY VALUES AND STRONG THUNDERSTORMS WINDS COULD POSE
A CONCERN FOR FIRE WEATHER INTERESTS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

MTZ008>014-044>053-121200-
BEAVERHEAD-NORTHERN ROCKY MOUNTAIN FRONT-EASTERN GLACIER-HILL-
CASCADE-CHOUTEAU-CENTRAL AND SOUTHERN LEWIS AND CLARK-TOOLE-
LIBERTY-EASTERN PONDERA-BLAINE-SOUTHERN ROCKY MOUNTAIN FRONT-
EASTERN TETON-JUDITH BASIN-FERGUS-JEFFERSON-BROADWATER-
435 AM MDT WED JUL 11 2012

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

.DAY ONE...TODAY AND TONIGHT

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

In the hours before

Special weather statement, Jul 11, 1:19 PM MDT, 1 hour 33 minutes before

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Special weather statement, Jul 11, 2:52 PM MDT, 0 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 10, 7:52 PM MDT	Special Weather Statement	TFX	Hill, Liberty, Toole	38 min
Jul 11, 3:16 PM MDT	Special Weather Statement	TFX	Gallatin	44 min
Jul 11, 3:44 PM MDT	Special Weather Statement	TFX	Broadwater	46 min

Nearby

Special Weather Statements in Montana, 2012 Every special weather statement in 2012

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.