Alert archive / Montana / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 11, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at Jul 12, 2001, 2:23 PM MDT for Powell County, Montana. It was in force for 52 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
- Jul 12, 2001, 2:23 PM MDT (20:23 UTC)
- Expired
- Jul 12, 2001, 3:15 PM MDT
- In force
- 52 min
- Issued by
- NWS Missoula, MT
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Powell County, MT
The nearest sounding before it
Great_falls, MT (KTFX), launched 12:00Z, 8.4 hours before the alert went out and 185 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
- 2375 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- -5 m²/s²
- 0-3 km storm-relative helicity
- 7 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 KMSO 122024 SVRMSO MTC077-122115- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MISSOULA MT 223 PM MDT THU JUL 12 2001 THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... CENTRAL POWELL COUNTY IN WEST CENTRAL MONTANA * UNTIL 315 PM MDT * AT 223 PM MDT...RADAR INDICATED A SEVERE THUNDERSTORM 7 MILES WEST OF GARRISON...OR 13 MILES NORTHWEST OF DEER LODGE...MOVING NORTHEAST AT 20 MPH. * THE SEVERE THUNDERSTORM WILL BE... 4 MILES NORTHWEST OF GARRISON AT 230 PM MDT SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS AND HAIL...ALONG WITH FREQUENT LIGHTNING AND HEAVY RAIN. FOR YOUR PROTECTION...GO INDOORS AND STAY AWAY FROM WINDOWS. IF YOU ARE CAUGHT OUTSIDE...MOVE TO A WELL PROTECTED AREA. LAT...LON 4689 11268 4656 11303 4641 11302 4671 11242 HARMER
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 Missoula, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 12, 10:00 AM MDT, 4 hours 23 minutes earlier.
Area forecast discussion, Jul 12, 10:00 AM MDT, 4 hours 23 minutes before
WESTERN MONTANA AND NORTH CENTRAL IDAHO FORECAST DISCUSSION NATIONAL WEATHER SERVICE MISSOULA MT 1000 AM MDT THU JUL 12 2001 NO UPDATES AT THIS TIME. SOUTHWEST FLOW OVER THE CWA WITH SEVERAL WEAK SHORT WAVES MOVING ACROSS THE AREA. EXPECT SHOWERS/THUNDERSTORMS TO DEVELOP DURING THE AFTERNOON. SPC HAS ENTIRE CWA UNDER A SLIGHT RISK OF SEVERE THUNDERSTORMS TODAY. LOOKING AT THE 12Z ETA IT APPEARS THE BEST CHANCE OF STRONG THUNDERSTORMS WILL BE ACROSS THE SOUTHEASTERN ZONES. KOLATA .MSO...FIRE WEATHER WATCH TODAY FOR FIRE WEATHER ZONE 104.
In the hours before
Special weather statement, Jul 12, 10:30 AM MDT, 3 hours 53 minutes before
IDZ009-010-MTZ006-007-122215- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MISSOULA MT 1025 AM MDT (925 AM PDT) THU JUL 12 2001 ...STRONG THUNDERSTORMS POSSIBLE THIS AFTERNOON AND EVENING OVER RAVALLI...GRANITE...DEER LODGE AND SILVER BOW COUNTIES IN MONTANA AND LEMHI COUNTY IN IDAHO... STRONG THUNDERSTORMS PRODUCING STRONG GUSTY WINDS AND HAIL ARE POSSIBLE OVER SOUTHWEST MONTANA WEST OF THE CONTINENTAL DIVIDE...AND IN LEMHI COUNTY IN IDAHO THIS AFTERNOON AND EVENING. THUNDERSTORMS WILL OCCUR ELSEWHERE...BUT ARE NOT EXPECTED TO BE AS STRONG AS THOSE IN THESE AREAS. THE ATMOSPHERE REMAINS VERY UNSTABLE TODAY...AND A WEAK UPPER LEVEL DISTURBANCE PASSING OVER NORTH CENTRAL IDAHO AND SOUTHWEST MONTANA THIS AFTERNOON AND EVENING...WILL TRIGGER SCATTERED STRONG THUNDERSTORMS INTO THE EVENING HOURS. STAY TUNED FOR FURTHER UPDATES ON THUNDERSTORM DEVELOPMENT THIS AFTERNOON AND EVENING. FELSCH
The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 11, 6:10 PM MDT | Severe Thunderstorm Warning | MSO | Missoula | 50 min |
| Jul 12, 4:36 PM MDT | Flash Flood Warning | MSO | Granite, Ravalli | 114 min |
| Jul 12, 5:16 PM MDT | Severe Thunderstorm Warning | MSO | Deer Lodge, Granite, Powell | 59 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.