Alert archive / Montana / Severe Thunderstorm Warnings in 2000
Severe Thunderstorm Warning 117, NWS Great Falls, MT
NWS Great Falls, MT issued this severe thunderstorm warning at Sep 5, 2000, 6:40 PM MDT for Blaine County, Fergus County, Montana. It was in force for 50 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
- Sep 5, 2000, 6:40 PM MDT (00:40 UTC)
- Expired
- Sep 5, 2000, 7:30 PM MDT
- In force
- 50 min
- Issued by
- NWS Great Falls, MT
- Area
- Whole counties
Counties Blaine County, MT, Fergus County, MT
The radar
The Great Falls radar (KTFX), 177 km from the middle of the area, began a volume at 00:42 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
Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 0.7 hours before the alert went out and 190 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
- 256 J/kg
- Mixed-layer CIN
- -222 J/kg
- Mixed-layer LCL
- 1019 m above ground
- 0-6 km bulk shear
- 57 kt
- 0-1 km storm-relative helicity
- 8 m²/s²
- 0-3 km storm-relative helicity
- 12 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 060041
SVRGTF
MTC005-027-060130-
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREAT FALLS MT
640 PM MDT TUE SEP 5 2000
THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTHERN FERGUS COUNTY IN CENTRAL MONTANA
SOUTHERN BLAINE COUNTY IN NORTH CENTRAL MONTANA
* UNTIL 730 PM MDT
* AT 638 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM 10 MILES NORTHWEST OF WINIFRED...OR JUST
SOUTHEAST OF ILIAD...MOVING EAST NORTHEAST AT 40 MPH WITH THE
CAPACITY TO PRODUCE WINDS OVER 60 MPH AND LARGE HAIL.
* THE SEVERE THUNDERSTORM WILL BE OVER...
RURAL SOUTHERN BLAINE COUNTY AT 650 PM MDT
HAIL UP TO ONE AND A HALF INCHES IN DIAMETER HAS BEEN REPORTED
WITH THIS STORM. IF YOU ARE IN THE PATH OF THE STORM...PUT YOUR CAR
IN A GARAGE AND 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 4770 10977 4762 10970 4750 10943 4757 10893
4784 10893 4804 10926 4794 10952 4777 10954
pWhat 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 Sep 5, 3:00 PM MDT, 3 hours 40 minutes earlier.
Area forecast discussion, Sep 5, 3:00 PM MDT, 3 hours 40 minutes before
SOUTHWEST AND NORTH CENTRAL MONTANA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREAT FALLS MT 300 PM MDT TUE SEP 5 2000 SLOW BUT STEADY MOVEMENT OF TROF TOWARDS THE EAST. A SECOND TROF OVER BRITISH COLUMBIA MOVES ACROSS THE HI LINE AND JOINS WITH NORTHERN BRANCH OF TROF...LEAVING THE SOUTHERN END OF THE TROF BEHIND. TROF SHOULD BE ACROSS THE ROCKIES IN THE NORTH BY 12Z WEDNESDAY...OVER EXTREME ERN MT BY EVENING. MID-HI LVL CLOUD COVER ASSOCIATED WITH THE AXIS...AND QUITE A BIT OF LOW LVL MOISTURE ACROSS THE STATE CAUSING SOME LOWER LEVEL CLOUDS. SEVERAL WEAK VORT LOBES MOVING THRU SWLY FLOW AHEAD OF TROF...HOWEVER MOSTLY SHEAR VORT AND VERY LITTLE VERTICAL VELOCITY IS CREATED. SO COMBINATION OF MOISTURE AND INSTABILITY AGAIN APPEARS TO BE SOURCE OF ACTION...AND NOTICED THAT BUTTE IS REPORTING TCU ALL QUADS. ONE ITEM OF CONCERN IS WHETHER THE SHORT WAVE IN BRITISH COLUMBIA WILL CONTINUE TO MOVE QUICKLY TO THE EAST OR GET CAUGHT UP WITH THE SLOWER MOVING TROF OVER THE ROCKIES. AT THE MOMENT ONLY LOOKING AT A PERIOD OF ENHANCED DYNAMICS ALONG THE NORTHERN ZONES. ALSO...A SECONDARY COLD FRONT IS ASSOCIATED WITH THE FASTER MOVING SHORT WAVE. THIS MAY DRIFT FURTHER SOUTH THAN THE CURRENT PROGS DEPICT...ALTHO THE LATEST MESO DOES BRING THE 552 THICKNESS SOUTH OF THE CANADIAN BORDER. RIDGING OVER THE PAC NW BY WEDNESDAY AFTN...AND EXCEPT FOR SOME AREAS IN THE SOUTH WILL BE IN A DRIER AND COOLER AIRMASS. WIND NEEDS TO BE MENTIONED AS THE TROF MOVES EAST AND WINDS GO WESTERLY...NOT ANYTHING OUT OF THE ORDINARY THOUGH. ZELZER EXTENDED DISCUSSION...IT SEEMS LIKE EVERY VERSION OF THE MRF HAS A DIFFERENT SHORT WAVE PATTERN...ALTHOUGH THE LONG WAVE FEATURES ARE FAIRLY CONSISTENT. THE MAIN MESSAGE ON THE PROGS IS THAT THE WESTERLIES WILL BE BREAKING INTO MONTANA DURING THE 3 TO 5 DAY PERIOD. SHORT WAVE DETAILS BETWEEN MRF...72HOUR AVN...72HOUR UKMET AND ECMWF ARE ALL DIFFERENT. ALL BUT THE MRF HINT AT MORE DIGGING OF MAIN LONG WAVE TROUGH...ESPECIALLY ECMWF. WILL FORECAST MOSTLY DRY AND WINDY WITH SHOWERS IN THE NORTHERN MOUNTAINS IN THE 3 TO 5 DAY FORECAST. OARD CCF NUMBERS GTF EB 050/070 045/076 048 133111 CTB BB 0i49/065 045/072 044 132111 HLN EB 050/070 045/076 042 134111 BZN EB 040/075 036/077 038 134111 WEY EB 032/066 028/068 030 134111 DLN EB 038/072 036/074 038 134111 HVR EB 050/070 046/076 046 133111 LWT EB 050/065 044/070 044 133111
The office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 5, 6:18 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Fergus | 27 min |
| Sep 5, 8:27 PM MDT | Tornado Warning | TFX | Judith Basin | 18 min |
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; radar from the NEXRAD Level II archive.