Alert archive / Montana / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 76, NWS Glasgow, MT

July 4, 2008Garfield County, McCone County, Montana

NWS Glasgow, MT issued this severe thunderstorm warning at Jul 4, 2008, 9:15 PM MDT for Garfield County, McCone County, Montana. It was in force for 35 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 4, 2008, 9:15 PM MDT (03:15 UTC)
Expired: Jul 4, 2008, 9:50 PM MDT
In force: 35 min
Issued by: NWS Glasgow, MT
Area: Storm-based polygon

Counties Garfield County, MT, McCone County, MT

The radar

The Glasgow radar (KGGW), 85 km from the middle of the area, began a volume at 03:17 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 4, 3:05 PM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Great_falls, MT (KTFX), launched 00:00Z, 3.3 hours before the alert went out and 316 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: 838 J/kg
Mixed-layer CIN: -172 J/kg
Mixed-layer LCL: 2852 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: -14 m²/s²
0-3 km storm-relative helicity: 120 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

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 Glasgow, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 4, 8:50 PM MDT, 25 minutes earlier.

Area forecast discussion, Jul 4, 8:50 PM MDT, 25 minutes before

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Hazardous weather outlook, Jul 4, 3:54 AM MDT, 17 hours 21 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GLASGOW MT
354 AM MDT FRI JUL 4 2008

MTZ016-021-059>061-051000-
CENTRAL AND SOUTHEAST PHILLIPS-PETROLEUM-NORTHERN PHILLIPS-
SOUTHWEST PHILLIPS-NORTHERN VALLEY-
354 AM MDT FRI JUL 4 2008

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHEAST
MONTANA.

.DAY ONE...TODAY AND TONIGHT
A COLD FRONT WILL MOVE THROUGH THE AREA THIS EVENING. THERE IS A
CHANCE OF THUNDERSTORMS ALONG AND AHEAD OF THE FRONT. SOME STORMS
MAY BECOME SEVERE WITH LARGE HAIL AND DAMAGING WIND GUSTS TO 60
MPH.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

NO HAZARDOUS WEATHER EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

MTZ017-022-023-051000-
CENTRAL AND SOUTHERN VALLEY-GARFIELD-MCCONE-
354 AM MDT FRI JUL 4 2008

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHEAST
MONTANA.

.DAY ONE...TODAY AND TONIGHT
A LAKE WIND ADVISORY IS IN EFFECT FROM 6 PM THIS EVENING THROUGH 6
PM SATURDAY FOR FORT PECK LAKE. SOUTHEAST WINDS WILL INCREASE 15
TO 25 MPH THIS EVENING AHEAD OF A COLD FRONT. THERE IS A SLIGHT
CHANCE OF THUNDERSTORMS TONIGHT. A FEW STORMS MAY BECOME SEVERE
THIS EVENING WITH LARGE HAIL AND DAMAGING WINDS GUSTS TO 60 MPH.

THE WINDS WILL BECOME NORTHWEST LATE TONIGHT AND INCREASE TO 15 TO
25 MPH WITH GUSTS TO 35 MPH ON SATURDAY.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

A LAKE WIND ADVISORY REMAINS IN EFFECT UNTIL 6 PM SATURDAY.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

In the hours before

Local storm report, Jul 4, 7:34 PM MDT, 1 hour 41 minutes before

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Local storm report, Jul 4, 7:48 PM MDT, 1 hour 27 minutes before

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Local storm report, Jul 4, 7:49 PM MDT, 1 hour 26 minutes before

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Local storm report, Jul 4, 7:55 PM MDT, 1 hour 20 minutes before

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Local storm report, Jul 4, 8:00 PM MDT, 1 hour 15 minutes before

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Local storm report, Jul 4, 8:54 PM MDT, 21 minutes before

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The office that day

Everything else NWS Glasgow, MT issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 4, 6:28 PM MDT	Severe Thunderstorm Warning	GGW	Petroleum	43 min
Jul 4, 6:54 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, Petroleum, Phillips	66 min
Jul 4, 7:57 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, Phillips, Valley	24 min
Jul 4, 8:08 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, Phillips, Valley	37 min
Jul 4, 10:40 PM MDT	Severe Thunderstorm Warning	GGW	Garfield	65 min

Nearby

Severe Thunderstorm Warnings in Montana, 2008 Every severe thunderstorm warning in 2008

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.