Alert archive / Montana / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 117, NWS Glasgow, MT

July 26, 2011Roosevelt County, Sheridan County, Montana

NWS Glasgow, MT issued this severe thunderstorm warning at Jul 26, 2011, 4:25 PM MDT for Roosevelt County, Sheridan County, Montana. It was in force for 55 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 26, 2011, 4:25 PM MDT (22:25 UTC)
Expired
Jul 26, 2011, 5:20 PM MDT
In force
55 min
Issued by
NWS Glasgow, MT
Area
Storm-based polygon

Counties Roosevelt County, MT, Sheridan County, MT

The radar

The Glasgow radar (KGGW), 142 km from the middle of the area, began a volume at 22:26 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.

IssuedProductOfficeLasted
Jul 26, 2:43 PM MDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 12:00Z, 10.4 hours before the alert went out and 140 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, Glasgow Intl Airport, MT at 12:00Z on 2011-07-26Temperature 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, Glasgow Intl Airport, MT at 12:00Z on 2011-07-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -88 square meters per square second.1939587897Sfc1 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
0 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
-88 m²/s²
0-3 km storm-relative helicity
-31 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.3

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 26, 3:19 PM MDT, 1 hour 6 minutes earlier.

Area forecast discussion, Jul 26, 3:19 PM MDT, 1 hour 6 minutes before
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Hazardous weather outlook, Jul 26, 3:07 AM MDT, 13 hours 18 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GLASGOW MT
307 AM MDT TUE JUL 26 2011

MTZ016>027-059>062-271100-
CENTRAL AND SOUTHEAST PHILLIPS-CENTRAL AND SOUTHERN VALLEY-
DANIELS-SHERIDAN-WESTERN ROOSEVELT-PETROLEUM-GARFIELD-MCCONE-
RICHLAND-DAWSON-PRAIRIE-WIBAUX-NORTHERN PHILLIPS-
SOUTHWEST PHILLIPS-NORTHERN VALLEY-EASTERN ROOSEVELT-
307 AM MDT TUE JUL 26 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHEAST
MONTANA.

.DAY ONE...TODAY AND TONIGHT

A COLD FRONT MOVING ACROSS THE AREA TODAY WILL BRING ANOTHER ROUND
OF THUNDERSTORMS. SOME STORMS MAY BECOME SEVERE IN THE AFTERNOON
WITH LARGE HAIL AND STRONG WINDS.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.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 26, 2:11 PM MDT, 2 hours 14 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GLASGOW MT
211 PM MDT TUE JUL 26 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0210 PM     TSTM WND GST     GLASGOW                 48.20N 106.64W
07/26/2011  M62 MPH          VALLEY             MT   ASOS

&&

METZGER
Local storm report, Jul 26, 2:18 PM MDT, 2 hours 7 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GLASGOW MT
218 PM MDT TUE JUL 26 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0214 PM     HAIL             3 N FLATWILLOW          46.87N 108.39W
07/26/2011  E1.25 INCH       PETROLEUM          MT   TRAINED SPOTTER

&&

JB
Local storm report, Jul 26, 2:30 PM MDT, 1 hour 55 minutes before
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Special weather statement, Jul 26, 3:50 PM MDT, 35 minutes before
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Local storm report, Jul 26, 3:56 PM MDT, 29 minutes before
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Local storm report, Jul 26, 4:23 PM MDT, 2 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 25, 6:19 PM MDTSpecial Weather StatementGGWPhillips56 min
Jul 25, 7:31 PM MDTSpecial Weather StatementGGWPhillips59 min
Jul 25, 7:37 PM MDTSevere Thunderstorm WarningGGWGarfield, Phillips, Valley68 min
Jul 25, 8:00 PM MDTSevere Thunderstorm WarningGGWGarfield60 min
Jul 25, 8:42 PM MDTSpecial Weather StatementGGWValley63 min
Jul 25, 8:51 PM MDTTornado WarningGGWGarfield24 min
Jul 25, 9:11 PM MDTSevere Thunderstorm WarningGGWGarfield, McCone64 min
Jul 25, 11:45 PM MDTSpecial Weather StatementGGWGarfield60 min
Jul 26, 12:14 AM MDTSpecial Weather StatementGGWValley61 min
Jul 26, 1:18 AM MDTSpecial Weather StatementGGWValley57 min
Jul 26, 6:28 AM MDTSpecial Weather StatementGGW62 min
Jul 26, 1:10 PM MDTSpecial Weather StatementGGWPhillips65 min
Jul 26, 1:28 PM MDTSevere Thunderstorm WarningGGWPhillips, Valley34 min
Jul 26, 1:50 PM MDTSevere Thunderstorm WarningGGWValley55 min
Jul 26, 2:03 PM MDTSpecial Weather StatementGGWPetroleum57 min
Jul 26, 2:18 PM MDTSevere Thunderstorm WarningGGWGarfield, Petroleum57 min
Jul 26, 2:27 PM MDTSevere Thunderstorm WarningGGWValley31 min
Jul 26, 3:11 PM MDTSevere Thunderstorm WarningGGWGarfield, Petroleum36 min
Jul 26, 3:24 PM MDTSevere Thunderstorm WarningGGWDaniels, Roosevelt, Sheridan66 min
Jul 26, 3:50 PM MDTSpecial Weather StatementGGWPetroleum25 min
Jul 26, 3:54 PM MDTSevere Thunderstorm WarningGGWGarfield, Petroleum, Phillips66 min
Jul 26, 4:56 PM MDTSevere Thunderstorm WarningGGWGarfield, Valley64 min
Jul 26, 5:53 PM MDTSevere Thunderstorm WarningGGWGarfield, McCone37 min
Jul 26, 5:57 PM MDTSpecial Weather StatementGGW33 min

Nearby

Severe Thunderstorm Warnings in Montana, 2011Every severe thunderstorm warning in 2011

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.