Alert archive / Montana / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 19, NWS Great Falls, MT
NWS Great Falls, MT issued this severe thunderstorm warning at Jun 29, 2001, 10:42 PM MDT for Fergus County, Montana. It was in force for 18 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
- Jun 29, 2001, 10:42 PM MDT (04:42 UTC)
- Expired
- Jun 29, 2001, 11:00 PM MDT
- In force
- 18 min
- Issued by
- NWS Great Falls, MT
- Area
- Whole counties
County Fergus County, MT
The radar
The Billings radar (KBLX), 164 km from the middle of the area, began a volume at 04:41 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.
The nearest sounding before it
Great_falls, MT (KTFX), launched 00:00Z, 4.7 hours before the alert went out and 106 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
- 2 J/kg
- Mixed-layer CIN
- -35 J/kg
- Mixed-layer LCL
- 2637 m above ground
- 0-6 km bulk shear
- 61 kt
- 0-1 km storm-relative helicity
- 10 m²/s²
- 0-3 km storm-relative helicity
- 243 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WWUS55 KGTF 300442 CCA SVRGTF MTC027-300500- SEVERE THUNDERSTORM WARNING...CORRECTED NATIONAL WEATHER SERVICE GREAT FALLS MT 1042 PM MDT FRI JUN 29 2001 CORRECTED FOR PROPER CODING ... A SEVERE THUNDERSTORM WARNING HAS BEEN EXTENDED FOR SOUTHEASTERN FERGUS COUNTY UNTIL 1100 PM MDT... AT 1029 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 12 MILES SOUTHWEST OF GRASS RANGE...OR 21 MILES SOUTHEAST OF LEWISTOWN...MOVING EAST oAT 40 MPH. THE SEVERE THUNDERSTORM WILL BE 4 MILES SOUTH OF GRASS RANGE AT 1045 PM MDT. $$
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 Jun 29, 9:00 PM MDT, 1 hour 42 minutes earlier.
Area forecast discussion, Jun 29, 9:00 PM MDT, 1 hour 42 minutes before
SOUTHWEST AND NORTH CENTRAL MONTANA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREAT FALLS MT 900 PM MDT FRI JUN 29 2001 NO UPDATES PLANNED THIS EVENING. FORECAST APPEARS ON TRACK. MAIN FEATURE THIS EVENING IS THE MODERATELY STRONG UPSLOPE FLOW OVER MUCH OF THE CWA. HIGH PRESSURE IS POSITIONED OVER S CENTRAL ALBERTA AND WILL CONTINUE TO EXERT UPSLOPE PRESSURE NEXT 36 HOURS. CURRENT FORECAST CALLS FOR A CHANCE OF SHOWERS BY MORNING...ALONG FRONT RANGE...LOW LEVEL MOISTURE INCREASES IN THE UPSLOPE FLOW. THIS IS SUPPORTED BY THE NEW ETA. A FAIRLY MOIST SHORT WAVE TROUGH IS DUE NEXT...SATURDAY NIGHT AND EARLY SUNDAY...BRINGING A GOOD CHANCE SHOWERS OR THUNDERSTORMS. CROSS- SECTIONS SUGGEST BEST CHANCE OF PRECIPITATION AROUND MIDNIGHT SATURDAY NIGHT...WITH DRYING BY LATE SUNDAY MORNING. CURRENT FORECAST HAS SITUATION WELL COVERED. MIELKE CCF NUMBERS GTF BB 052/082 055/082 048 04325 CTB EN 049/076 051/078 045 04225 HLN BB 053/085 055/085 050 04223 BZN BB 051/084 051/083 046 04323 WEY BB 045/080 045/079 040 04433 DLN BB 050/084 050/083 047 04222 HVR EB 056/085 060/085 050 04125 LWT EB 054/079 054/079 046 04234
The office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 29, 10:00 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 30 min |
Nearby
Severe Thunderstorm Warnings in Montana, 2001Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.