Alert archive / Montana / Winter Storm Warnings in 2011
Winter Storm Warning 7, NWS Glasgow, MT
NWS Glasgow, MT issued this winter storm warning at Apr 22, 2011, 4:07 AM MDT for Petroleum County, Wibaux County, Montana. It was in force for 16 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Apr 22, 2011, 4:07 AM MDT (10:07 UTC)
- Expired
- Apr 22, 2011, 8:25 PM MDT
- In force
- 16 hr
- Issued by
- NWS Glasgow, MT
Counties Petroleum County, MT, Wibaux County, MT
The radar
The Glasgow radar (KGGW), 133 km from the middle of the area, began a volume at 10:06 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
Rapid City, SD (KUNR), launched 00:00Z, 10.1 hours before the alert went out and 422 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.
- Mixed-layer CAPE
- 423 J/kg
- Mixed-layer CIN
- -7 J/kg
- Mixed-layer LCL
- 1630 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 77 m²/s²
- 0-3 km storm-relative helicity
- 178 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 3.2
What forecasters said that day
The local office's own words before this winter storm 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 winter storm warning went out at Apr 22, 3:43 AM MDT, 24 minutes earlier.
Area forecast discussion, Apr 22, 3:43 AM MDT, 24 minutes before
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</html>Hazardous weather outlook, Apr 21, 3:02 PM MDT, 13 hours 5 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GLASGOW MT 302 PM MDT THU APR 21 2011 MTZ016-017-059-061-221200- CENTRAL AND SOUTHEAST PHILLIPS-CENTRAL AND SOUTHERN VALLEY- NORTHERN PHILLIPS-NORTHERN VALLEY- 302 PM MDT THU APR 21 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHEAST MONTANA. .DAY ONE...THIS AFTERNOON AND TONIGHT A FLOOD WARNING REMAINS IN EFFECT FOR VALLEY AND NORTHEAST PHILLIPS COUNTIES. FLOODING WILL CONTINUE ON THE MILK RIVER AND THE NORTHERN TRIBUTARIES FOR THE NEXT FEW WEEKS. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY 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. MTZ021>027-060-221200- PETROLEUM-GARFIELD-MCCONE-RICHLAND-DAWSON-PRAIRIE-WIBAUX- SOUTHWEST PHILLIPS- 302 PM MDT THU APR 21 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHEAST MONTANA. .DAY ONE...THIS AFTERNOON AND TONIGHT NO HAZARDOUS WEATHER EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY A STORM SYSTEM WILL AFFECT THE AREA TONIGHT AND FRIDAY. THERE IS A POTENTIAL FOR ACCUMULATING SNOW...DEPENDING ON TEMPERATURES FRIDAY. THE AREAS MOST LIKELY TO SEE ACCUMULATING SNOW FROM THIS STORM WILL BE HIGHER ELEVATION AREAS LIKE THE LITTLE ROCKY MOUNTAINS...BIG SHEEP MOUNTAINS...WIBAUX...PETROLEUM AND WESTERN GARFIELD COUNTIES. A WINTER WEATHER ADVISORY IS IN EFFECT FOR WIBAUX COUNTY FOR FRIDAY AND FRIDAY EVENING. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
The office that day
Everything else NWS Glasgow, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 22, 4:07 AM MDT | Winter Weather Advisory | GGW | Dawson, Garfield, McCone, Phillips, Prairie, Richland | 11 hr |
Nearby
Winter Storm Warnings in Montana, 2011Every winter storm 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.