Alert archive / Montana / Severe Thunderstorm Warnings in 2000
Severe Thunderstorm Warning 96, NWS Great Falls, MT
NWS Great Falls, MT issued this severe thunderstorm warning at Aug 4, 2000, 5:46 PM MDT for Glacier County, Toole County, Montana. It was in force for 29 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
- Aug 4, 2000, 5:46 PM MDT (23:46 UTC)
- Expired
- Aug 4, 2000, 6:15 PM MDT
- In force
- 29 min
- Issued by
- NWS Great Falls, MT
- Area
- Whole counties
Counties Glacier County, MT, Toole County, MT
The nearest sounding before it
Great_falls, MT (KTFX), launched 12:00Z, 11.8 hours before the alert went out and 188 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.
- Mixed-layer CAPE
- 7 J/kg
- Mixed-layer CIN
- -445 J/kg
- Mixed-layer LCL
- 2274 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 9 m²/s²
- 0-3 km storm-relative helicity
- 118 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS55 KTFX 042348 SVRGTF MTC035-101-050015- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING...FOR GOLF BALL SIZE HAIL NATIONAL WEATHER SERVICE GREAT FALLS MT 546 PM MDT FRI AUG 4 2000 THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHEASTERN GLACIER COUNTY IN NORTH CENTRAL MONTANA * UNTIL 615 PM MDT * AT 535 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM ALONG THE GLACIER COUNTY-CANADIAN BORDER... MOVING EAST AT 30 MPH. HAIL UP TO GOLF BALL SIZE HAS BEEN REPORTED WITH THIS STORM AT THE DEL BONITA BORDER CROSSING. IF YOU ARE IN THE PATH OF THE STORM MOVE TO A SUBSTANTIAL SHELTER. REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN GREAT FALLS. $$ LAT...LON 4906 11278 4888 11279 4884 11213 4906 11211
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 Great Falls, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 4, 3:00 PM MDT, 2 hours 46 minutes earlier.
Area forecast discussion, Aug 4, 3:00 PM MDT, 2 hours 46 minutes before
SOUTHWEST AND NORTH CENTRAL MONTANA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREAT FALLS MT 300 PM MDT FRI AUG 4 2000 UPPER TROUGH STRETCHING FROM SASK INTO ERN WA/OR THIS AFTERNOON WITH AXIS SLIDING SWD INTO SRN MT BY MORNING. SEVERAL SHORT WAVES SPIN AROUND BASE OF TROUGH AND ACROSS GTF CWFA TONIGHT. VORTICITY ADVECTION AND INCREASED MOISTURE WILL CONTINUE TO PRODUCE WIDESPREAD SCATTERED SHOWERS ACROSS NRN HALF GTF CWFA OVERNIGHT. FLOW BEHIND TROUGH BECOMES MORE NWLY WITH TIME AND THE ENTIRE STATE COMES UNDER NW FLOW ALOFT BY SATURDAY AFTERNOON. ALTHOUGH PLENTY OF MOISTURE APPEARS TO BE AVAILABLE FOR SHOWERS SATURDAY...DYNAMICS ARE WEAKER WITH MAIN TROUGH SOUTH OF CWFA. THUS WILL GO WITH SLIGHT CHANCE SHOWERS FOR SATURDAY DECREASING SATURDAY NIGHT. WILL MAKE MENTION OF ISOLATED AFTERNOON THUNDERSTORMS OVER MOUNTAINS OF SW ZONES SUNDAY AFTERNOON. OTHERWISE AIRMASS WILL BECOME INCREASINGLY STABLE ON SUNDAY WITH ONLY LINGERING MOISTURE AS WEAK RIDGING DEVELOPS OVER MT. FURTHERMORE EXPECT SOME DOWNSLOPE WINDS TO DEVELOP ALONG EAST SLOPES SUNDAY AFTERNOON. TEMPERATURES WILL LEVEL OFF THRU INITIAL PERIOD WITH HIGHS MAINLY IN THE LOWER 80S. BRITTON EXTENDED DISCUSSION...AN UPPER LEVEL LOW PRESSURE TROUGH WILL BE MOVING ACROSS NRN IDAHO AND MONTANA LATE MONDAY AND EARLY TUESDAY. A SURFACE COLD FRONT WILL ACCOMPANY THIS FEATURE AND MOVE INTO NORTHWEST MONTANA EARLY TUESDAY AND MOVE SOUTHEAST ACROSS THE STATE. THIS WILL CAUSE A MODERATION IN TEMPERATURES WITH AN INCREASING CHANCE OF SHOWERS AND THUNDERSTORMS AS THE FRONT MOVES THROUGH THE STATE. THE RIDGE REBUILDS AGAIN BY WEDNESDAY...TEMPERATURES WILL REBOUND SOMEWHAT CAUSING THE AIRMASS TO BECOME SLIGHTLY UNSTABLE. ZELZER CCF NUMBERS GTF EB 056/082 054/084 056 064210 CTB EB 053/080 052/080 054 064201 HLN EK 058/085 055/087 056 062201 BZN EB 053/084 050/085 052 062201 WEY EB 044/076 042/075 044 062211 DLN EK 052/082 050/082 053 062200 HVR BB 058/082 056/084 057 064210 LWT EB 054/080 052/082 054 064210
Nearby
Severe Thunderstorm Warnings in Montana, 2000Every severe thunderstorm warning in 2000
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.