Alert archive / Montana / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 9, NWS Great Falls, MT
NWS Great Falls, MT issued this severe thunderstorm warning at Jun 27, 2001, 5:00 PM MDT for Cascade County, Lewis and Clark County, Teton County, Montana. It was in force for 45 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 27, 2001, 5:00 PM MDT (23:00 UTC)
- Expired
- Jun 27, 2001, 5:45 PM MDT
- In force
- 45 min
- Issued by
- NWS Great Falls, MT
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Cascade County, MT, Lewis and Clark County, MT, Teton County, MT
The radar
The Great Falls radar (KTFX), 59 km from the middle of the area, began a volume at 23:03 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, 11.0 hours before the alert went out and 118 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
- 890 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 129 m²/s²
- 0-3 km storm-relative helicity
- 132 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 272301 SVRGTF MTC013-049-099-272345- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE GREAT FALLS MT 500 PM MDT WED JUN 27 2001 THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHWESTERN CASCADE COUNTY IN CENTRAL MONTANA SOUTH CENTRAL TETON COUNTY IN NORTH CENTRAL MONTANA NORTH CENTRAL LEWIS AND CLARK COUNTY IN WEST CENTRAL MONTANA * UNTIL 545 PM MDT * AT 457 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 22 MILES SOUTHWEST OF FAIRFIELD...OR ABOUT 28 MILES WEST OF CASCADE...MOVING NORTHEAST AT 35 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... FAIRFIELD AT 535 PM MDT 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 4737 11245 4721 11213 4764 11170 4776 11210 (
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 27, 2:45 PM MDT, 2 hours 15 minutes earlier.
Area forecast discussion, Jun 27, 2:45 PM MDT, 2 hours 15 minutes before
SOUTHWEST AND NORTH CENTRAL MONTANA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREAT FALLS MT 245 PM MDT WED JUN 27 2001 AIR EVEN MORE MOIST THAN ANTICIPATED ACROSS MOST OF THE CWA THIS AFTERNOON WITH LOW LEVEL EASTERLY FLOW. MSAS PLOT AND MODIFIED 12Z SOUNDING INDICATING AN LI OF -6 OVER GTF AT 2 PM. THE QUESTION IS... WHERE WILL THE TRIGGER COME FROM TO START CONVECTION? FRONT AND ASSOCIATED SHOWERS LYING ALONG THE WESTERN BORDER IS THE BEST POSSIBILITY. THIS FEATURE SEEMS TO BE MOVING SLOWER THAT MODELS HAD INDICATED...BUT CONVECTION ALSO OCCURRING AHEAD OF IT. STRONGER SHORTWAVE IN WYOMING WILL MOVE INTO EASTERN MONTANA AND NOT BE A FACTOR IN OUR FORECAST. FLOW ALOFT BECOMES INCREASING DIFFLUENT OVER THE NEXT 6-12 HOURS...SO WILL CONTINUE WITH SCATTERED POPS TONIGHT... EXCEPT FOR NORTHEAST ZONES WHERE LIKELY POPS WILL BE USED. BEST MOISTURE CONVERGENCE OCCURS THERE AROUND 06Z...AND WITH THE SUN BREAKING OUT THIS AFTERNOON...TEMPERATURES MAY STILL BE IN THE 70S BY THE TIME THE BOUNDARY MAKES IT THERE. FOR THURSDAY AND FRIDAY...UPPER FLOW BECOMES MORE CYCLONIC...ALTHOUGH RESIDUAL INSTABILITY AND WEAK SHORTWAVES AFFECTING THE SOUTHEAST ZONES WILL ALLOW FOR ISOLATED THUNDERSTORMS DURING THE AFTERNOON AND EVENING. POMEROY EXTENDED...UPPER LEVEL LOW PRESSURE TROUGH REMAINS CENTERED OFF BC COAST EARLY IN PERIOD WITH HIGH PRESSURE RIDGE CENTERED OVER FOUR CORNERS REGION. TROUGH CONTINUES TO SPIN DISTURBANCES INLAND WITH SOUTHWEST FLOW OVER PACIFIC NORTHWEST STEERING THE DISTURBANCES INTO WESTERN MONTANA. THE STRONGEST OF THESE WILL BRUSH ACROSS THE NORTHWEST AND NORTHERN PORTION OF THE CWA SATURDAY NIGHT AND SUNDAY FOR THE BEST CHANCE OF SHOWERS. AS THIS DISTURBANCE EXITS...THE HIGH PRESSURE RIDGE BEGINS STRENGTHENING AND RETROGRADING...WITH THE CENTER OVER NORTHWEST WY AND THE AXIS SHIFTING TO THE MT/ID BORDER. THIS SHIFT WILL KEEP TEMPERATURES SEASONABLY WARM WITH ONLY ISOLATED AFTERNOON SHOWERS OR THUNDERSTORMS OVER THE MOUNTAINS. GTF BB 054/078 050/078 048 19511 CTB BB 050/072 047/072 045 19511 HLN BB 045/080 050/080 050 19411 BZN BB 052/080 049/080 048 19422 WEY BB 046/072 044/074 042 19422 DLN BB 051/078 047/078 056 19411 HVR BU 054/083 050/083 050 19611 LWT BB 053/074 048/074 046 19422
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.