Alert archive / Montana / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 9, NWS Glasgow, MT

June 19, 2015Richland County, Roosevelt County, Montana

NWS Glasgow, MT issued this severe thunderstorm warning at Jun 19, 2015, 4:12 PM MDT for Richland County, Roosevelt County, Montana. It was in force for 18 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 19, 2015, 4:12 PM MDT (22:12 UTC)
Expired: Jun 19, 2015, 4:30 PM MDT
In force: 18 min
Issued by: NWS Glasgow, MT
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Richland County, MT, Roosevelt County, MT

The radar

The Glasgow radar (KGGW), 138 km from the middle of the area, began a volume at 22:13 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
Jun 19, 2:01 PM MDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 12:00Z, 10.2 hours before the alert went out and 136 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: 181 J/kg
Mixed-layer CIN: -225 J/kg
Mixed-layer LCL: 1086 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 86 m²/s²
0-3 km storm-relative helicity: 85 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 19, 2:01 PM MDT, 2 hours 11 minutes earlier.

Area forecast discussion, Jun 19, 2:01 PM MDT, 2 hours 11 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
201 PM MDT FRI JUN 19 2015

.SHORT TERM...FOR NORTHEAST MONTANA...TONIGHT THROUGH SUNDAY...
ATMOSPHERE A BIT VOLATILE THIS AFTERNOON AS UPPER LOW OVER
BRITISH COLUMBIA IS INDUCING A DIFFLUENT FLOW ALOFT OVER THE AREA.
BUT LOW LEVELS ARE BECOMING UNSTABLE ESPECIALLY OVER SE MT WHERE
FULL JUNE SUNSHINE IS DESTABILIZING THE LOW LEVELS MAINLY SE OF
THE YELLOWSTONE RIVER.

EXPECTING STORMS TO TRACK ACROSS THE NE ZONES THIS AFTERNOON TO
REMAIN STRONG. BUT WITH UNCERTAINTY...WILL LEAVE SEVERE WORDING.
BETTER INSTABILITY OVER THE SE ZONES MAY LEAD TO A BRIEF SUPERCELL
FOR LARGE HAIL AND/OR DAMAGING WINDS...SO WILL LEAVE WORDING HERE AS
WELL.
SYSTEM CLEARS OUT TONIGHT. WITH LIGHT WINDS AND CLEARING SKIES...FOG
LOOKS POSSIBLE IN THE NORTHEAST ZONES.

THE COOLER AIRMASS ASSOCIATED WITH THE UPPER LOW BLANKETS MONTANA
SATURDAY. A DRIER AIRMASS WITH THE SLIGHTLY COOLER TEMPERATURES
(HIGHS IN THE 70S MOSTLY) WILL MAKE FOR PLEASANT OUTDOOR ACTIVITIES.

A STRENGTHENING SW UPPER FLOW AHEAD OF AN UPPER TROUGH WILL BRING
SLIGHTLY BETTER INSTABILITY TO AREA SUNDAY...BUT NOTHING COMPARED TO
TODAY. TFJ

.LONG TERM...SUNDAY NIGHT THROUGH FRIDAY...

MODELS DO NOT REVEAL ANY NEW DIFFERENCES. THEREFORE FEW EDITS WERE
NECESSARY. WITH A CONVECTIVELY ACTIVE DAY TODAY...WILL KEEP
CHANGES TO A MINIMUM...AND MAINLY FOR COLLABORATION PURPOSES. SCT

PREVIOUS DISCUSSION...
PATTERN OF ZONAL FLOW ACROSS THE NORTHERN STATES WITH EMBEDDED
SHORTWAVES CONTINUES THROUGH NEXT WEEK. THIS WILL RESULT IN NEAR
OR SLIGHTLY BELOW NORMAL TEMPERATURES AND UNSETTLED WEATHER.

WHILE THE OVERALL CHANCE OF THUNDERSTORMS DURING THE PERIOD IS
HIGH...MODEL DIFFERENCES ON TIMING OF THE SHORTWAVES AS THEY MOVE
THROUGH THE FLOW RESULTS IN LOW CONFIDENCE FOR INDIVIDUAL PERIODS.
WITH THE SUGGESTION OF SLIGHT RIDGING MOVING INTO EASTERN MONTANA
ON MONDAY BY BOTH THE EC AND GFS...WENT WITH DRY CONDITIONS FOR
MUCH OF THE AREA EARLY. AS THE RIDGE MOVES EAST LATE IN THE DAY
THE UPPER FLOW TURNS JUST SLIGHTLY SOUTHWEST ALTHOUGH THE GFS IS
SLIGHTLY BEHIND THE EC. THIS WILL BEGIN TO IMPROVE THE OPPORTUNITY
FOR THUNDERSTORMS THROUGH MIDWEEK WHEN ANOTHER SHORTWAVE PUSHES
ACROSS THE STATE. AGAIN THE MODEL TIMING IS SLIGHTLY DIFFERENT FOR
THIS WAVE. UPPER RIDGE IS EXPECTED TO REBOUND OVER THE NORTHERN
ROCKIES BY NEXT WEEKEND FOR WARMER AND POTENTIALLY DRIER
CONDITIONS. EBERT

&&

.AVIATION...
VFR...EXCEPT NEAR STORMS.

A CONVECTIVELY ACTIVE DAY AND EVENING IS EXPECTED.

WITH UNSTABLE CONDITIONS IN PLACE...AN APPROACHING COLD FRONT WILL
BRING A CHANCE FOR SHOWERS AND THUNDERSTORMS INTO THE EVENING. THE
STRONGEST STORMS...WHICH COULD PRODUCE LARGE HAIL AND DAMAGING
WINDS...ARE EXPECTED MAINLY IN THE LOWER YELLOWSTONE VALLEY...AND
FURTHER TO THE SOUTHEAST.

SCT

&&

.GLASGOW WATCHES/WARNINGS/ADVISORIES...NONE.

&&

WEATHER.GOV/GLASGOW

Hazardous weather outlook, Jun 19, 3:55 AM MDT, 12 hours 17 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GLASGOW MT
355 AM MDT FRI JUN 19 2015

MTZ016>027-059>062-201100-
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-
355 AM MDT FRI JUN 19 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHEAST
MONTANA.

.DAY ONE...TODAY AND TONIGHT

ANOTHER ROUND OF SHOWERS AND THUNDERSTORMS WITH SOME BECOMING
SEVERE ALONG THE YELLOWSTONE VALLEY WILL BE POSSIBLE THIS
AFTERNOON AND EVENING. DAMAGING WINDS... LARGE HAIL... AND HEAVY
RAIN WILL BE POSSIBLE WITH THE STRONGEST STORMS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

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, Jun 19, 3:09 PM MDT, 1 hour 3 minutes before

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Local storm report, Jun 19, 3:11 PM MDT, 1 hour 1 minute before

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Local storm report, Jun 19, 3:22 PM MDT, 50 minutes before

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Local storm report, Jun 19, 3:34 PM MDT, 38 minutes before

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Local storm report, Jun 19, 3:58 PM MDT, 14 minutes before

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Local storm report, Jun 19, 4:02 PM MDT, 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GLASGOW MT
402 PM MDT FRI JUN 19 2015

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

0350 PM     TSTM WND GST     14 S TERRY              46.59N 105.31W
06/19/2015  E60 MPH          PRAIRIE            MT   TRAINED SPOTTER

            HAIL FROM DIME TO NICKEL SIZE

&&

BB

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 19, 12:10 PM MDT	Special Weather Statement	GGW		65 min
Jun 19, 1:03 PM MDT	Special Weather Statement	GGW	Valley	57 min
Jun 19, 1:38 PM MDT	Severe Thunderstorm Warning	GGW	Daniels, Roosevelt, Valley	52 min
Jun 19, 1:43 PM MDT	Severe Thunderstorm Warning	GGW	Valley	48 min
Jun 19, 2:22 PM MDT	Severe Thunderstorm Warning	GGW	Daniels, Roosevelt, Sheridan, Valley	53 min
Jun 19, 2:48 PM MDT	Special Weather Statement	GGW	McCone	57 min
Jun 19, 2:59 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, Garfield, McCone	49 min
Jun 19, 3:15 PM MDT	Severe Thunderstorm Warning	GGW	McCone, Richland, Roosevelt	60 min
Jun 19, 3:20 PM MDT	Severe Thunderstorm Warning	GGW	Prairie	55 min
Jun 19, 3:58 PM MDT	Severe Thunderstorm Warning	GGW	Dawson	62 min
Jun 19, 4:16 PM MDT	Special Weather Statement	GGW	Dawson	59 min
Jun 19, 4:25 PM MDT	Severe Thunderstorm Warning	GGW	Richland, Roosevelt	20 min
Jun 19, 4:26 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, Richland, Wibaux	46 min
Jun 19, 4:36 PM MDT	Special Weather Statement	GGW	Phillips	54 min
Jun 19, 4:37 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, Richland, Wibaux	23 min
Jun 19, 4:47 PM MDT	Severe Thunderstorm Warning	GGW	Phillips, Valley	58 min
Jun 19, 4:53 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, Wibaux	58 min
Jun 19, 5:40 PM MDT	Special Weather Statement	GGW	Valley	65 min
Jun 19, 5:50 PM MDT	Severe Thunderstorm Warning	GGW	Daniels, Phillips, Valley	55 min

Nearby

Severe Thunderstorm Warnings in Montana, 2015 Every severe thunderstorm warning in 2015

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.