Alert archive / Montana / Severe Thunderstorm Warnings in 2000
Severe Thunderstorm Warning 104, NWS Great Falls, MT
NWS Great Falls, MT issued this severe thunderstorm warning at Aug 11, 2000, 1:18 PM MDT for Blaine County, Montana. It was in force for 27 min. 1 report came from 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, with what was reported inside it.
The facts
- Issued
- Aug 11, 2000, 1:18 PM MDT (19:18 UTC)
- Expired
- Aug 11, 2000, 1:45 PM MDT
- In force
- 27 min
- Issued by
- NWS Great Falls, MT
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Blaine County, MT
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 11, 1:40 PM MDT | Thunderstorm Wind 60 M | Chinook, MT |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
The nearest sounding before it
Great_falls, MT (KTFX), launched 12:00Z, 7.3 hours before the alert went out and 134 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
- 150 J/kg
- Mixed-layer CIN
- -266 J/kg
- Mixed-layer LCL
- 1752 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 38 m²/s²
- 0-3 km storm-relative helicity
- 49 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 111918 SVRGTF MTC005-111945- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE GREAT FALLS MT 118 PM MDT FRI AUG 11 2000 THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... WEST CENTRAL BLAINE COUNTY IN NORTH CENTRAL MONTANA * UNTIL 145 PM MDT * AT 114 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 16 MILES SOUTHWEST OF LLOYD...OR ABOUT 22 MILES EAST OF BIG SANDY...MOVING NORTHEAST AT 25 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... OVER LLOYD AT 130 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 4825 10954 4806 10950 4834 10884 4853 10903 $$ BRUSDA NNNN
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 11, 9:30 AM MDT, 3 hours 48 minutes earlier.
Area forecast discussion, Aug 11, 9:30 AM MDT, 3 hours 48 minutes before
SOUTHWEST AND NORTH CENTRAL MONTANA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREAT FALLS MT 930 AM MDT FRI AUG 11 2000 ...UPDATES PLANNED FOR ZONES AND STATE... ETA/NGM INITIALIZATIONS HAD VORTICITY CENTER OVER NE OREGON AT 12Z BUT WATER VAPOR IMAGERY APPEARED TO HAVE IT OVER SE WA. FEATURE WAS MOVING NE ON IMAGERY WHEREAS MODELS HAD IT MOVING TO THE ENE. THERE CONTINUE TO BE SOME LIGHTNING STRIKES ASSOCIATED WITH COOLER AIR ALOFT ASSOCIATED WITH VORTICITY CENTER. THESE WILL AFFECT NRN ZONES INTO THE AFTERNOON. DRIER AIR IS MOVING INTO SW MT SO WILL DROP MENTION OF THUNDERSTORMS FOR THAT AREA. FOR THE LWT ZONE WATER VAPOR IMAGERY SHOWS A WEAK BAND OF MOISTURE OVER AREA AND A LITTLE UPSTREAM. AS OF 9 AM RADAR WAS INDICATING SOME SHOWERS/TSTMS MOVING OUT OF AREA. LATEST MESO KEEPS CONVECTION OVER AREA THROUGH THE AFTERNOON. WILL PLAY IT SAFE AND KEEP IN MENTION OF SHOWERS/TSTMS INTO THE AFTERNOON. GUSTY WINDS SHOULD DEVELP BY AFTERNOON AS HIGHER SFC PRESSURES DEVELOP BEHIND UPPER TROUGH AND HEATING ALLOWS FOR HOOKUP TO INCREASED WINDS ALOFT. SO RED FLAG WARNING WILL BE CONTINUED. FORECAST HIGHS FOR TODAY LOOK OK. BLANK EXTENDED...ZONAL FLOW PERSISTS ACROSS CWA DAYS 3 AND 4 FOR DRY CONDITIONS. SURFACE GRADIENTS SUPPORT GUSTY SOUTHWEST TO WEST WINDS AT TIMES...ESPECIALLY DAY 3. INCREASING BACKING FLOW ALOFT DAY 5 WITH ISOLATED CONVECTIVE ACTIVITY A POSSIBILTY...ESPECIALLY NEAR THE MOUNTAINS. TEMPERATURES WILL WARM SLOWLY DAYS 3 AND 4 WITH A STRONGER WARM-UP DAY 5. EMANUEL CCF NUMBERS GTF BU 083/050 083/052 085 08200 CTB BU 076/047 080/048 083 08300 HLN BH 083/050 085/050 086 08100 BZN BH 082/046 085/046 086 08100 WEY BB 077/036 082/038 082 08111 DLN HH 084/043 084/044 086 08100 HVR TU 083/052 085/050 086 08410 LWT TU 083/048 084/048 086 08310
The office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 7:51 PM MDT | Severe Thunderstorm Warning | TFX | Gallatin | 24 min |
| Aug 11, 11:03 AM MDT | Severe Thunderstorm Warning | TFX | Cascade, Teton | 27 min |
| Aug 11, 11:27 AM MDT | Severe Thunderstorm Warning | TFX | Cascade | 33 min |
| Aug 11, 11:54 AM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau | 51 min |
| Aug 11, 12:38 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau | 52 min |
| Aug 11, 12:54 PM MDT | Severe Thunderstorm Warning | TFX | Hill | 51 min |
| Aug 11, 1:44 PM MDT | Severe Thunderstorm Warning | TFX | Blaine | 61 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.