Severe Thunderstorm Warning 76, NWS Glasgow, MT

Issued

Jul 8, 2002, 8:10 PM MDT (02:10 UTC)

Expired

Jul 8, 2002, 9:15 PM MDT

In force

65 min

Issued by

NWS Glasgow, MT

Area

Counties, with a storm outline in the text

County Valley County, MT

The Glasgow radar (KGGW), 51 km from the middle of the area, began a volume at 02:12 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.

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.

000 
WUUS55 KGGW 090210
SVRGGW
MTC105-090315-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GLASGOW MT
810 PM MDT MON JUL 8 2002

THE NATIONAL WEATHER SERVICE IN GLASGOW HAS ISSUED A

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

* UNTIL 915 PM MDT

* AT 802 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS FROM 20 MILES WEST OF OPHEIM TO 28
  MILES SOUTH OF LARSLAN...OR FROM 20 MILES WEST OF OPHEIM TO 18
  MILES WEST OF WOLF POINT...MOVING EAST AT 20 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  LARSLAN BY 825 PM MDT
  OPHEIM BY 835 PM MDT
  PORT OF OPHEIM...GLENTANA BY 855 PM MDT

THIS STORM HAS A HISTORY OF PRODUCING DAMAGING WINDS.

LAT...LON 4900 10691 4810 10621 4806 10586 4861 10611
          4900 10621

.END
POHL

NWS Glasgow, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 8, 2:40 PM MDT, 5 hours 30 minutes earlier.

NORTHEAST MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
240 PM MDT MON JUL 8 2002

.SHORT TERM...SEVERE WATCH BOX INCLUDES WESTERN 4 COUNTIES.  EXPECT
THE COLD FRONT TO GENERATE ENOUGH DYNAMIC MIX TO GENERATE STRONG
THUNDERSTORMS.  FRONT IS MOVING RAPIDLY EAST AND WILL COMPLETELY
CROSS THE CWA BY LATE EVENING.  THETA E RIDGE AND CAPE GRADIENTS ARE
CONCENTRATED OVER THE CWA.  30+ KT LOW LEVEL JET CONTINUING STRONG
SOUTHEAST FLOW INTO THE CWA.  LAKE WIND ADVISORY WILL CONTINUE THIS
EVENING BECAUSE OF PROXIMITY TO CONVECTION OUTFLOW AND LOW LEVEL JET.

19Z SOUNDING SHOWING SOUTHEAST FLOW THROUGH 725MB BETWEEN 25-35
KTS.  ABOVE 725MB FLOW VEERS TO SOUTHWEST FOR REMAINDER OF
SOUNDING.  CAPE APPEARS LARGER THAN 12Z SOUNDING.  AIR COLUMN IS
WETTER THAN THE MORNING SOUNDING AND HINTS AT A LAPSE RATE NEARLY
PARALLEL TO THE MOIST ADIABATS FOR THIS AFTERNOON.  CWA IS STILL
AHEAD OF THE COLD FRONT AND LEADING INSTABILITY.  INDICES ARE: 2800+
J/KG CAPE  -8 LI  1.41 PW  314 SWEAT  63 M/S MAX VERT VELOCITY  82F
CONV TEMP

CIRRUS BLOW OFF FROM THUNDERSTORMS WEST OF CWA IS BEGINNING TO REACH
GGW.  CU FIELDS ARE DEVELOPING OVER THE AREA AND SHOWING SIGNS OF
INCREASED INSTABILITY.

.LONG TERM...MEDIUM RANGE MODELS IN FAIR AGREEMENT SO WILL CONTINUE
WITH THE AVN/MRF SOLUTION.  RIDGE WILL DOMINATE FRIDAY AND
SATURDAY.  A STRONG LOW WILL PUSH THROUGH THE RIDGE SUNDAY WITH A
TRAILING COLD POOL LASTING INTO MONDAY.  LOOKING AT POTENTIAL
THUNDERSTORMS SUNDAY AND MONDAY.  MCNULTY

KGGW BBB 057/082 056/085 052/078 81810011
     BBBW 059/087 059/091 058/090 055/087 8100000466
KGDV BBB 063/084 056/084 051/077 81710011
     BBBW 056/090 060/092 061/089 055/091 8100001337

.GGW...LAKE WIND ADVISORY FOR FORT PECK LAKE TONIGHT.

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

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.