Alert archive / Montana / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 77, NWS Great Falls, MT

July 28, 2013Fergus County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Jul 28, 2013, 7:21 PM MDT for Fergus County, Montana. 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 counties it named.

The facts

Issued: Jul 28, 2013, 7:21 PM MDT (01:21 UTC)
Expired: Jul 28, 2013, 7:45 PM MDT
In force: 24 min
Issued by: NWS Great Falls, MT
Area: Storm-based polygon

County Fergus County, MT

The radar

The Billings radar (KBLX), 164 km from the middle of the area, began a volume at 01:24 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, 1.4 hours before the alert went out and 223 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: 134 J/kg
Mixed-layer CIN: -170 J/kg
Mixed-layer LCL: 1798 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 69 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

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 28, 5:50 PM MDT, 1 hour 31 minutes earlier.

Area forecast discussion, Jul 28, 5:50 PM MDT, 1 hour 31 minutes before

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Hazardous weather outlook, Jul 28, 4:47 AM MDT, 14 hours 34 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GREAT FALLS MT
447 AM MDT SUN JUL 28 2013

MTZ008>015-044>055-291100-
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-
447 AM MDT SUN JUL 28 2013

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

.DAY ONE...TODAY AND TONIGHT

SCATTERED THUNDERSTORMS WILL DEVELOP IN SOUTHWEST MONTANA AND
ALONG THE ROCKY MOUNTAIN FRONT THIS AFTERNOON AND SPREAD INTO
CENTRAL MONTANA THIS EVENING. WIND GUSTS AROUND 40 TO 45 MPH AND
SMALL HAIL WILL BE POSSIBLE WITH SOME OF THE STRONGER STORMS.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

A SIGNIFICANT SHIFT TO COOLER AND WETTER CONDITIONS IS EXPECTED
FOR THE LATTER HALF OF THIS WEEK AS A PACIFIC WEATHER SYSTEM
BRINGS IN WIDESPREAD MOISTURE...RESULTING IN SEVERAL PERIODS OF
SHOWERS AND THUNDERSTORMS FROM WEDNESDAY EVENING THROUGH FRIDAY
NIGHT.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

In the hours before

Special weather statement, Jul 28, 3:31 PM MDT, 3 hours 50 minutes before

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Special weather statement, Jul 28, 3:48 PM MDT, 3 hours 33 minutes before

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Local storm report, Jul 28, 3:56 PM MDT, 3 hours 25 minutes before

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Special weather statement, Jul 28, 4:30 PM MDT, 2 hours 51 minutes before

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Special weather statement, Jul 28, 5:18 PM MDT, 2 hours 3 minutes before

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Special weather statement, Jul 28, 7:03 PM MDT, 18 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 28, 7:03 PM MDT	Special Weather Statement	TFX	Fergus	42 min
Jul 28, 7:45 PM MDT	Severe Thunderstorm Warning	TFX	Glacier	45 min
Jul 28, 9:39 PM MDT	Special Weather Statement	TFX	Liberty	51 min
Jul 28, 10:22 PM MDT	Special Weather Statement	TFX	Hill	38 min
Jul 28, 10:37 PM MDT	Special Weather Statement	TFX	Liberty	38 min
Jul 28, 11:17 PM MDT	Special Weather Statement	TFX	Chouteau	43 min
Jul 28, 11:19 PM MDT	Special Weather Statement	TFX	Hill	41 min
Jul 29, 12:14 AM MDT	Special Weather Statement	TFX	Blaine	46 min
Jul 29, 12:19 AM MDT	Special Weather Statement	TFX	Chouteau	41 min
Jul 29, 12:32 AM MDT	Special Weather Statement	TFX	Broadwater	43 min
Jul 29, 12:56 AM MDT	Severe Thunderstorm Warning	TFX	Blaine	49 min
Jul 29, 1:43 AM MDT	Severe Thunderstorm Warning	TFX	Blaine	32 min
Jul 29, 1:49 AM MDT	Special Weather Statement	TFX	Judith Basin	56 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.