Alert archive / Montana / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 2, NWS Glasgow, MT

May 28, 2002Valley County, Montana

NWS Glasgow, MT issued this severe thunderstorm warning at May 28, 2002, 5:41 PM MDT for Valley County, Montana. It was in force for 64 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: May 28, 2002, 5:41 PM MDT (23:41 UTC)
Expired: May 28, 2002, 6:45 PM MDT
In force: 64 min
Issued by: NWS Glasgow, MT
Area: Counties, with a storm outline in the text

County Valley County, MT

The radar

The Glasgow radar (KGGW), 13 km from the middle of the area, began a volume at 23:44 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.

What was reported inside it

Time	Report	Where	Remark
May 28, 5:50 PM MDT	Thunderstorm Wind 52 E	Glasgow, MT	Off duty National Weather Service employee reported a 60 mph wind gust in Glasgow.

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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 12:00Z, 11.7 hours before the alert went out and 11 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: 1956 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 61 m²/s²
0-3 km storm-relative helicity: 118 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS55 KGGW 282341
SVRGGW
MTC105-290045-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GLASGOW MT
540 PM MDT TUE MAY 28 2002

THE NATIONAL WEATHER SERVICE IN GLASGOW HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL VALLEY COUNTY IN NORTHEAST MONTANA

* UNTIL 645 PM MDT

* AT 534 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 12 MILES SOUTH OF TAMPICO...OR ABOUT 12 MILES
  WEST OF GLASGOW...MOVING NORTHEAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  GLASGOW AND TAMPICO BY 600 PM MDT
  SAINT MARIE BY 635 PM MDT

STRONG AND DAMAGING WINDS ARE LIKELY WITH THIS STORM. 

LAT...LON 4816 10707 4804 10689 4811 10594 4849 10597
          4865 10622 4861 10695

.END
POHL

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 28, 2:22 PM MDT, 3 hours 19 minutes earlier.

Area forecast discussion, May 28, 2:22 PM MDT, 3 hours 19 minutes before

NORTHEAST MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
222 PM MDT TUE MAY 28 2002

.SHORT TERM...SHORTWAVE TROUGH MOVING EAST ACROSS WESTERN MONTANA
THIS AFTERNOON WILL AFFECT NORTHEAST MT LATE TONIGHT. MODELS IN
AGREEMENT WITH MOVING STRONG VORT MAX OVER THE FORECAST AREA IN THE
06Z TO 15Z TIME FRAME WITH A COLD FRONT. ENOUGH INSTABILITY EXPECTED
FOR SCATTERED THUNDERSTORMS WITH THIS WAVE. MESOETA IS FORECASTING
LI OF -1 AND CAPE UP TO 200 J/KG LATE TONIGHT. WILL MENTION
SCATTERED THUNDERSTORMS TONIGHT WITH THIS SYSTEM.

RIDGING ALOFT BUILDS OVER MONTANA WED AND THU. ONE MODEL DIFFERENCE
FOR THU IS THE AVN IS COOLER THAN THE ETA/NGM. GIVEN THE RIDGING
ALOFT AND PLENTY OF SUN EXPECTED...WILL SIDE WITH WARMER MODELS. A
WAVE COMING OVER THE TOP OF THE RIDGE THU NIGHT SHOULD SHEAR OUT AND
DRY OUT BEFORE IT REACHES NE MT. IT DOES BRING A WEAK COLD FRONT
ACROSS SO FRIDAY WILL BE SOMEWHAT COOLER.

.LONG TERM...RIDING ALOFT ON SATURDAY GIVES WAY TO AN UPPER TROUGH
EARLY NEXT WEEK. THE AVN BRINGS A SHORTWAVE TROUGH AND SFC LOW
ACROSS SE MONTANA SAT NIGHT WITH A POTENTIAL FOR HEAVY RAIN. WILL
NEED TO KEEP A WATCH ON THIS SYSTEM. WILL KEEP SAT DRY FOR NOW AND
MENTION CHANCE OF SHOWERS AND THUNDERSTORMS THE REMAINDER OF THE
PERIOD. FORRESTER

KGGW BBB 051/080 046/082 046/077 79400011
     EWWW 046/073 045/072 045/072 045/071 7922333333
   KGDV BBB 054/078 048/082 045/077 79420011
     EWWW 044/073 043/072 043/072 042/071 7922433333
.GGW...NONE.

Nearby

Severe Thunderstorm Warnings in Montana, 2002 Every severe thunderstorm warning in 2002

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; radar from the NEXRAD Level II archive.