Alert archive / Montana / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 89, NWS Glasgow, MT

June 30, 2007Sheridan County, Montana

NWS Glasgow, MT issued this severe thunderstorm warning at Jun 30, 2007, 8:19 AM MDT for Sheridan County, Montana. It was in force for 26 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
Jun 30, 2007, 8:19 AM MDT (14:19 UTC)
Expired
Jun 30, 2007, 8:45 AM MDT
In force
26 min
Issued by
NWS Glasgow, MT
Area
Counties, with a storm outline in the text

County Sheridan County, MT

The radar

The Glasgow radar (KGGW), 166 km from the middle of the area, began a volume at 14:22 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

Great_falls, MT (KTFX), launched 12:00Z, 2.3 hours before the alert went out and 474 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-pSkew-T log-p diagram, Great_falls, MT at 12:00Z on 2007-06-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Great_falls, MT at 12:00Z on 2007-06-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -34 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
1747 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
-34 m²/s²
0-3 km storm-relative helicity
159 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 Glasgow, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 30, 3:43 AM MDT, 4 hours 36 minutes earlier.

Area forecast discussion, Jun 30, 3:43 AM MDT, 4 hours 36 minutes before
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Hazardous weather outlook, Jun 29, 2:22 PM MDT, 17 hours 57 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GLASGOW MT
222 PM MDT FRI JUN 29 2007

MTZ017-022-023-301200-
CENTRAL AND SOUTHERN VALLEY-GARFIELD-MCCONE-
222 PM MDT FRI JUN 29 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHEAST
MONTANA.

.DAY ONE...THIS AFTERNOON AND TONIGHT

A LAKE WIND ADVISORY IS IN EFFECT UNTIL 4 AM SATURDAY MORNING FOR
FORT PECK LAKE.  AN EAST WIND OF 20 TO 30 MPH THIS EVENING WILL
SHIFT INTO THE NORTHWEST AND DIMINISH TO 10 TO 20 MPH LATE
TONIGHT.  STRONG AND ERRATIC WIND GUSTS ARE POSSIBLE IN OR NEAR
ANY THUNDERSTORMS TONIGHT.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

NO HAZARDOUS WEATHER IS ANTICIPATED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

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

MTZ016-021-059>061-301200-
CENTRAL AND SOUTHEAST PHILLIPS-PETROLEUM-NORTHERN PHILLIPS-
SOUTHWEST PHILLIPS-NORTHERN VALLEY-
222 PM MDT FRI JUN 29 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHEAST
MONTANA.

.DAY ONE...THIS AFTERNOON AND TONIGHT

THERE IS THE RISK OF SEVERE THUNDERSTORMS THIS EVENING. THE
PRIMARY THREAT WILL BE LARGE HAIL...BUT DAMAGING WIND GUSTS ARE
ALSO POSSIBLE. THE THREAT OF SEVERE WEATHER WILL COME TO AN END
LATE TONIGHT.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

NO HAZARDOUS WEATHER IS ANTICIPATED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

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

BOGEL

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 29, 11:14 PM MDTSevere Thunderstorm WarningGGWPhillips61 min
Jun 30, 12:10 AM MDTSevere Thunderstorm WarningGGWPhillips, Valley27 min
Jun 30, 12:41 AM MDTSevere Thunderstorm WarningGGWPhillips49 min
Jun 30, 1:42 AM MDTSevere Thunderstorm WarningGGWPhillips63 min
Jun 30, 2:28 AM MDTSevere Thunderstorm WarningGGWPhillips47 min
Jun 30, 2:55 AM MDTSevere Thunderstorm WarningGGWPhillips, Valley16 min

Nearby

Severe Thunderstorm Warnings in Montana, 2007Every severe thunderstorm warning in 2007

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.