Alert archive / Montana / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 7, NWS Glasgow, MT

June 8, 2002Prairie County, Montana

NWS Glasgow, MT issued this severe thunderstorm warning at Jun 8, 2002, 5:46 PM MDT for Prairie County, Montana. It was in force for 59 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: Jun 8, 2002, 5:46 PM MDT (23:46 UTC)
Expired: Jun 8, 2002, 6:45 PM MDT
In force: 59 min
Issued by: NWS Glasgow, MT
Area: Counties, with a storm outline in the text

County Prairie County, MT

The radar

The Glasgow radar (KGGW), 186 km from the middle of the area, began a volume at 23:45 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
Jun 8, 5:55 PM MDT	Hail 1	Mildred, 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.

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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 8, 1:15 PM MDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 12:00Z, 11.8 hours before the alert went out and 187 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: 1983 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 285 m²/s²
0-3 km storm-relative helicity: 484 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 082346
SVRGGW
MTC079-090045-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GLASGOW MT
545 PM MDT SAT JUN 8 2002

THE NATIONAL WEATHER SERVICE IN GLASGOW HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  PRAIRIE COUNTY IN NORTHEAST MONTANA

* UNTIL 645 PM MDT

* AT 545 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 4 MILES WEST OF FALLON...OR ABOUT 5 MILES
  NORTHEAST OF TERRY...MOVING NORTHEAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  FALLON BY 550 PM MDT

A TRAINED WEATHER SPOTTER REPORTED NICKEL SIZED HAIL AT TERRY AT 540 
PM.

VERY LARGE HAIL IS POSSIBLE WITH THIS STORM. IF YOU ARE IN THE PATH
OF THE STORM...SEEK SHELTER INDOORS.

A TORNADO WATCH IS ALSO IN EFFECT. SEVERE THUNDERSTORMS CAN PRODUCE
TORNADOES WITH LITTLE OR NO ADVANCE WARNING. PREPARE TO MOVE TO A
PLACE OF SAFETY IN A STURDY STRUCTURE SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM IF A TORNADO IS SPOTTED.

LAT...LON 4662 10571 4658 10503 4681 10466 4707 10599

.END

79

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 8, 3:00 PM MDT, 2 hours 46 minutes earlier.

Area forecast discussion, Jun 8, 3:00 PM MDT, 2 hours 46 minutes before

NORTHEAST MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
300 PM MDT SAT JUN 8 2002

.SHORT TERM...
COMPLEX STORM SYSTEM AFFECTING E MT WELL WITH SEVERE STORMS POISED TO
MOVE INTO MY SE ZONES IN THE NEXT SEVERAL HOURS. HAVE SIDED WITH THE
ETA MODEL MORE THROUGH THIS PERIOD WHICH MOVES SYSTEM OUT AND DRIES OUT
CWA A BIT QUICKER THAN SLOWER/WETTER AVN. QUITE A BIG DIFFERCE BETWEEN
THE MODELS...BUT ETA HAS HAD A GOOD TRACK RECORD.

THEREFORE HAVE TRIMMED POPS DOWN THROUGH MONDAY ACROSS ALL ZONES WITH
CATEGORICAL TONIGHT...LIKELIES SUNDAY...TO SCATTERED/S SUNDAY NIGHT
AND MONDAY. WRAP-AROUND LATER MONDAY MAY BRING RAIN LIKELY.

WINDS TODAY HAVE BEEN LOCALLY HIGHER (IN THE GLASGOW AND FORT PECK
AREAS) COMPARED TO MAV AND FWC NUMBERS...SO HAVE KEPT THE LAKE WIND
ADVISORY GOING FOR TONIGHT.

HAVE WEAKENED THE WORDING FOR TONIGHT/S SEVERE WEATHER ACROSS THE S AND
S ZONES OUTSIDE OF WATCH A BIT (ISOLATED STORMS MAY BE SEVERE).
GOING WATCH LOOKS GOOD.SEE LATEST SWOMCD FOR MORE INFO.

.LONG TERM...
LITTLE TIME TO LOOK AT MEDIUM RANGE MODELS...BUT HAVE DELAYED THE
CHANCE OF PRECIPITATION TO SATURDAY. UPPER RIDGE OVER THE WESTERN
STATES SHOULD ALLOW FOR DRY CONDITIONS WITH A WARMING TREND. NEGATIVELY
TILTED TROF HEADING TOWARD MT FROM CALIFORNIA WILL DECREASE STABILITY
FRIDAY...BUT LOW LEVELS HAVE TO MOISTEN UP FIRST. JAMBA

KGGW RWW 046/058 044/053 045/066 76975564
     BBBB 045/072 045/077 050/077 050/077 761010223
KGDV RWW 048/062 044/055 046/070 76975564
     BBBB 045/073 045/075 054/075 054/075 7610101223

.GGW...TORNADO WATCH FOR PRAIRIE AND WIBAUX COUNTIES UNTIL 7PM.
...LAKE WIND ADVISORY FOR FORT PECK LAKE TONIGHT.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 8, 4:33 PM MDT	Severe Thunderstorm Warning	GGW	McCone	57 min
Jun 8, 4:44 PM MDT	Severe Thunderstorm Warning	GGW	Prairie	61 min
Jun 8, 5:25 PM MDT	Severe Thunderstorm Warning	GGW	Wibaux	65 min
Jun 8, 5:34 PM MDT	Severe Thunderstorm Warning	GGW	Dawson	56 min
Jun 8, 5:58 PM MDT	Severe Thunderstorm Warning	GGW	McCone, Richland, Roosevelt	62 min

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.