Alert archive / Montana / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 19, NWS Glasgow, MT

June 25, 2001Valley County, Montana

NWS Glasgow, MT issued this severe thunderstorm warning at Jun 25, 2001, 4:08 AM MDT for Valley County, Montana. It was in force for 52 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jun 25, 2001, 4:08 AM MDT (10:08 UTC)
Expired: Jun 25, 2001, 5:00 AM MDT
In force: 52 min
Issued by: NWS Glasgow, MT
Area: Whole counties

County Valley County, MT

What was reported inside it

Time	Report	Where	Remark
Jun 25, 4:35 AM MDT	Thunderstorm Wind 52 E	Hinsdale, MT

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 10.1 hours before the alert went out and 17 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: 2577 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 171 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 25, 2:34 AM MDT, 1 hour 34 minutes earlier.

Area forecast discussion, Jun 25, 2:34 AM MDT, 1 hour 34 minutes before

NORTHEAST MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
234 AM MDT MON JUN 25 2001

ON THE SFC THIS MORNING A THUNDERSTORM CLUSTER IS MOVING INTO THE
EXTREME SOUTHEASTERN COUNTIES...WITH SOME CONVECTIVE DEVELOPMENT
ELSEWHERE IN THE EASTERN CWFA. 70 DEW POINT THIS HOUR AT KSDY AND 60
DEW POINTS ALL UP AND DOWN THE MT/ND BORDER. FARTHER WEST CONVECTION
ON GOING OVER THE MOUNTAINS TO THE WEST WITH THE MAIN TROF. POSITIVE
OMEGA REMAINS IN PLACE THROUGH THE REMAINDER OF THE OVERNIGHT HOURS
HERE IN EASTERN MONTANA...CAN EXPECT CONVECTION TO CONTINUE THROUGH
THE MORNING HOURS.

MODELS SHOW MAIN H5 TROF TO MAINLY STAY ABOVE THE 49TH PARALLEL
TODAY...HOWEVER ABOVE 850MB IN THE EAST REMAINS RATHER UNSTABLE
THROUGH THE NOON HOUR. WILL KEEP MORNING TSRA WORDING FOR THE ZONES.
FOR THIS AFTERNOON GOOD SUBSIDENCE ACROSS THE AREA...LOOKS LIKE
MOST AREAS CAN LINK UP TO 800MB...WHICH SHOULD MIX DOWN THE 20-25KT
WINDS...WILL KEEP WINDS IN THE 15-25 RANGE FOR NOW. WILL REMOVE PM
TSRA FROM ZONES...THE ATMOSPHERE REMAINS RATHER STABLE THROUGH LATE
TUESDAY AFTERNOON. WE SHOULD KEEP WESTERLY WINDS THROUGH TUESDAY
MORNING BEFORE THE WINDS SWITCH AROUND TO THE SOUTHEAST TO BRING
BACK SOME MOISTURE TO THE REGION AND A RETURN TO THE PM/OVERNIGHT
TSRA ACTIVITY.        PROTON

EXTENDED...MODELS CONTINUE TO ADVERTISE SOUTHWEST FLOW ALOFT THROUGH
MUCH OF THE EXTENDED. CHANCE OF THUNDERSTORMS THROUGH SATURDAY WITH
WEAK DISTURBANCE EMBEDDED IN THE SOUTHWEST FLOW. RIDGE STARTS TO
BUILD OVER THE REGION SUNDAY...RESULTING IN DRIER CONDITIONS AND
WARMER TEMPERATURES. WILL ADD A TUESDAY NIGHT FOR THUNDERSTORMS
OTHERWISE NO CHANGES TO THE EXTENDED PLANNED.       MEIER

KGGW /079 053/078 058/083 059/087 058/084 056/087 057/090
     TBTTTTB  94301/7853332
KGDV /083 054/080 058/084 059/087 057/084 056/087 056/090
     TBTTTTB  94311/7853332

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 25, 5:04 AM MDT	Severe Thunderstorm Warning	GGW	Valley	56 min

Nearby

Severe Thunderstorm Warnings in Montana, 2001 Every severe thunderstorm warning in 2001

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.