Alert archive / Montana / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 1, NWS Glasgow, MT

May 22, 2012Sheridan County, Montana

NWS Glasgow, MT issued this severe thunderstorm warning at May 22, 2012, 2:57 PM MDT for Sheridan County, Montana. It was in force for 42 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: May 22, 2012, 2:57 PM MDT (20:57 UTC)
Expired: May 22, 2012, 3:39 PM MDT
In force: 42 min
Issued by: NWS Glasgow, MT
Area: Storm-based polygon

County Sheridan County, MT

The radar

The Glasgow radar (KGGW), 166 km from the middle of the area, began a volume at 20:57 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 12:00Z, 9.0 hours before the alert went out and 164 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1517 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: -16 m²/s²
0-3 km storm-relative helicity: 367 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 May 22, 9:47 AM MDT, 5 hours 10 minutes earlier.

Area forecast discussion, May 22, 9:47 AM MDT, 5 hours 10 minutes before

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Hazardous weather outlook, May 22, 3:59 AM MDT, 10 hours 58 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GLASGOW MT
359 AM MDT TUE MAY 22 2012

MTZ016>027-059>062-231000-
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-
359 AM MDT TUE MAY 22 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHEAST
MONTANA.

.DAY ONE...TODAY AND TONIGHT

A BROAD UPPER LEVEL TROUGH AND COLD FRONT TODAY WILL BRING RAIN
SHOWERS AND STRONG WEST WINDS WITH ISOLATED THUNDERSTORMS TO THE
REGION. A LAKE WIND ADVISORY IS IN EFFECT FOR FORT PECK LAKE FROM
10 AM THIS MORNING THROUGH 9 PM THIS EVENING.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

A SLOW MOVING LOW PRESSURE SYSTEM IS EXPECTED TO MOVE ACROSS
MONTANA THIS WEEKEND. THERE IS THE POSSIBILITY OF WIDESPREAD RAIN
ACROSS THE REGION.

.SPOTTER INFORMATION STATEMENT...

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

In the hours before

Special weather statement, May 22, 2:50 PM MDT, 7 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GLASGOW MT
250 PM MDT TUE MAY 22 2012

MTZ019-222145-
SHERIDAN-
250 PM MDT TUE MAY 22 2012

THE NATIONAL WEATHER SERVICE IN GLASGOW HAS ISSUED A

SIGNIFICANT WEATHER ADVISORY FOR...
 NORTHEASTERN SHERIDAN COUNTY IN NORTHEAST MONTANA...

UNTIL 345 PM MDT.

AT 246 PM MDT...STORM SPOTTERS REPORTED A STRONG THUNDERSTORM 7 MILES
SOUTH OF PORT OF RAYMOND...MOVING EAST AT 15 MPH.

HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 40 MPH ARE
EXPECTED WITH THIS STORM.

LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...PORT OF RAYMOND AND
WESTBY.

THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND
TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

LAT...LON 4873 10405 4868 10457 4899 10471 4900 10467
      4900 10405
TIME...MOT...LOC 2049Z 254DEG 15KT 4890 10455

RSMITH
WEATHER.GOV/GLASGOW

The office that day

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

Issued	Product	Office	Counties	Lasted
May 22, 2:50 PM MDT	Special Weather Statement	GGW	Sheridan	55 min

Nearby

Severe Thunderstorm Warnings in Montana, 2012 Every severe thunderstorm warning in 2012

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.