Alert archive / Montana / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 8, NWS Great Falls, MT
NWS Great Falls, MT issued this severe thunderstorm warning at Jun 9, 2001, 6:20 AM MDT for Fergus County, Montana. It was in force for 35 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.
The facts
- Issued
- Jun 9, 2001, 6:20 AM MDT (12:20 UTC)
- Expired
- Jun 9, 2001, 6:55 AM MDT
- In force
- 35 min
- Issued by
- NWS Great Falls, MT
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Fergus County, MT
The radar
The Great Falls radar (KTFX), 141 km from the middle of the area, began a volume at 12:23 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 12:00Z, 0.3 hours before the alert went out and 82 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 999 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 15 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 091220
SVRGTF
MTC027-091255-
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREAT FALLS MT
620 AM MDT SAT JUN 9 2001
THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTHWESTERN FERGUS COUNTY IN CENTRAL MONTANA
* UNTIL 655 AM MDT
* AT 615 AM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM 25 MILES WEST OF WINIFRED...OR ABOUT 10 MILES
EAST OF SQUARE BUTTE...MOVING EAST AT 40 MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
NEAR WINIFRED AROUND 645 AM MDT
LARGE HAIL AND WINDS UP TO 60 MPH POSSIBLE WITH THIS SEVERE THUNDERSTORM.
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 4771 10933 4764 10965 4762 10986 4755 10983
4754 10992 4740 10989 4741 10969 4744 10956
4744 10946 4746 10934 4746 10925 4747 10913
4766 10925 4771 10925
POMEROY/COULSTONWhat 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 9, 2:51 AM MDT, 3 hours 29 minutes earlier.
Area forecast discussion, Jun 9, 2:51 AM MDT, 3 hours 29 minutes before
SOUTHWEST AND NORTH CENTRAL MONTANA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREAT FALLS MT 251 AM MDT SAT JUN 9 2001 THE BIGGEST CONCERN FOR FORECAST IS SEVERE THUNDERSTORM COMPLEX MOVING NORTHEAST FROM MISSOULA. LAST TWO RUNS OF MESO-ETA HAVE THIS FEATURE HANDLED VERY WELL...DEPICTING NICE 700MB CONVERGENCE/300MB DIVERGENCE COUPLET TO MOVE ACROSS NORTHERN PART OF CWA THIS MORNING. ALSO...00Z ETA SHOWING VERY STRONG QUASIGEOSTROPHIC CONVERGENCE WITH THIS FEATURE. SATELLITE PICTURES SHOW COOLING CLOUD TOPS OVER THE LAST COUPLE OF HOURS AND LOW LEVEL MOISTURE IS BEING PUSHED NORTH AHEAD OF THESE STORMS. SO AM FAIRLY CONFIDENT THE SHOWERS WILL SURVIVE THE TRIP OVER THE MOUNTAINS...AND RE-INTENSIFY ONCE IT REACHES HILL AND BLAINE COUNTIES AROUND NOON. SURFACE HEATING SHOULD ADD SOME FUEL TO THIS SYSTEM IN THAT AREA. SO WILL GO WITH LIKELY POPS FOR NORTHEAST PART OF CWA. PER COORDINATION WITH MSO...MAIN THREAT FROM THE SYSTEM RIGHT NOW IS STRONG WINDS. HAIL COULD BECOME AN ISSUE IF THE COMPLEX ENCOUNTERS DEW POINTS NEAR 50 IN THE HAVRE AREA AS GUIDANCE INDICATES. THIS FIGURE SEEMS REASONABLE WITH DEW P0INTS IN THE 50S CURRENTLY AS FAR NORTH AS LEWISTOWN. AFTER THE SHOWERS PASS...WEST WINDS WILL DEVELOP AND RAPID DRYING WILL OCCUR. ELSEWHERE...REGION WILL MOSTLY BE DRY. MODELS DEPICT SOME RIDGING TONIGHT...BUT CANNOT RULE OUT AN EARLY EVENING THUNDERSTORM ALONG THE PLAINS. FOR SUNDAY...MOST ENERGY RIDES NORTH OF THE AREA AS A FAIRLY STRONG COLD FRONT TRACKS THROUGH THE REGION. CONCERN FOR SUNDAY IS WIND ALONG THE HI-LINE AS A STRONG 700 MB FLOW PERSISTS OVER THAT AREA. EXTENDED...NO CHANGES TO EXTENDED. ECMWF 8 TO 10 HOURS QUICKER THAN MRF WITH THE NEXT LOW DROPPING INTO THE REGION EARLY ON TUESDAY. AT FIRST GLANCE SCENARIO LOOKS GOOD FOR RAIN...BUT EXAMINING THE DETAILS...MOISTURE ASSOCIATED WITH THE SYSTEM NOT AS PLENTIFUL AS I WOULD THINK. MOSTLY DRY LOOKS GOOD FOR WEDNESDAY THROUGH FRIDAY AS A WEAK RIDGE BUILDS IN. POMEROY CCF NUMBERS GTF EE 076/047 068/044 065 19312 CTB WE 072/045 062/045 061 19412 HLN EE 077/049 072/046 066 19211 BZN EB 076/043 070/043 066 19201 WEY BB 070/032 063/032 061 19201 DLN EB 073/037 071/042 067 19201 HVR TE 078/045 076/048 071 19612 LWT EB 074/042 072/044 064 19312=
The office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 9, 5:50 AM MDT | Severe Thunderstorm Warning | TFX | Chouteau | 25 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.