Alert archive / Montana / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 12, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at Jul 12, 2001, 5:16 PM MDT for Deer Lodge County, Granite County, Powell County, Montana. It was in force for 59 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, 5:16 PM MDT (23:16 UTC)
- Expired
- Jul 12, 2001, 6:15 PM MDT
- In force
- 59 min
- Issued by
- NWS Missoula, MT
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Deer Lodge County, MT, Granite County, MT, Powell County, MT
The nearest sounding before it
Great_falls, MT (KTFX), launched 12:00Z, 11.3 hours before the alert went out and 255 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 122317 SVRMSO MTC023-039-077-130015- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MISSOULA MT 516 PM MDT THU JUL 12 2001 THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHERN DEER LODGE COUNTY IN WEST CENTRAL MONTANA SOUTHEASTERN GRANITE COUNTY IN WEST CENTRAL MONTANA SOUTHERN POWELL COUNTY IN WEST CENTRAL MONTANA * UNTIL 615 PM MDT * AT 516 PM MDT...RADAR INDICATED A SEVERE THUNDERSTORM 25 MILES SOUTHWEST OF WEST VALLEY...OR 28 MILES WEST OF ANACONDA...MOVING NORTHEAST AT 20 MPH. * THE SEVERE THUNDERSTORM WILL BE... 3 MILES NORTHWEST OF WEST VALLEY...7 MILES NORTHWEST OF ANACONDA AT 615 PM MDT LARGE HAIL AND VERY HEAVY RAIN ARE LIKELY WITH THIS SEVERE THUNDERSTORM. DAMAGING WINDS IN EXCESS OF 55 MPH ARE POSSIBLE...ALONG WITH FREQUENT LIGHTNING. FOR YOUR PROTECTION...GO INDOORS AND STAY AWAY FROM WIND[OWS. IF YOU ARE CAUGHT OUTSIDE...MOVE TO A WELL PROTECTED AREA. LAT...LON 4606 11364 4591 11351 4615 11278 4638 11297
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, 2:30 PM MDT, 2 hours 46 minutes earlier.
Area forecast discussion, Jul 12, 2:30 PM MDT, 2 hours 46 minutes before
WESTERN MONTANA AND NORTH CENTRAL IDAHO FORECAST DISCUSSION NATIONAL WEATHER SERVICE MISSOULA MT 230 PM MDT THU JUL 12 2001 .SHORT TERM...SHOWERS AND THUNDERSTORMS FIRING OFF EARLY THIS AFTERNOON ACROSS THE SOUTHERN ZONES IN RESPONSE TO A VORT MAX LOCATED SOUTH OF MISSOULA. NEGATIVE LI'S AND STEEPEST LAPSE RATES OVER THE SOUTHEASTERN ZONES THIS EVENING. SOUTHWEST FLOW ALOFT CONTINUES ACROSS THE CWA THROUGH THE FORECAST PERIOD. SERIES OF WEAK SHORT WAVES MOVE IN THE FLOW AND ACROSS THE AREA EACH DAY. 12Z AVN AND ETA SIMILAR BUT FEEL THE AVN INITIALIZED BETTER. MAIN DIFFERENCE IS ON SATURDAY...THE AVN IS DRIER ACROSS THE CWA. WILL TREND THE POPS DOWN ON SATURDAY...BUT STILL KEEP WORDING FOR A SLIGHT CHANCE OF SHOWERS IN. KOLATA .EXTENDED...MODELS SIMILAR IN BRINGING THE OFFSHORE TROUGH INLAND SUNDAY OVER WASHINGTON AND OREGON AND THEN STALLING IT. THE ASSOCIATED CLOSED LOW ALONG THE WA/CANADIAN BORDER WEAKENS AND EJECTS TO THE NORTHEAST INTO CANADA BY WEDNESDAY MORNING. THE MRF MAKES THE FLOW ALOFT SLIGHTLY MORE WESTERLY...WHILE THE ECMWF KEEPS THE FLOW SOUTHWEST BY WEDNESDAY. COOLER TEMPS EXPECTED EITHER WAY FOR SUNDAY THROUGH TUESDAY...THEN A WARMING TREND AGAIN WITH HEIGHTS ALOFT RISING SLOWLY WITH SOUTHWEST FLOW PERSISTING. NO CHANGE AS FAR AS THE AFTERNOON AND EVENING CONVECTION IS CONCERNED WITH A CHANCE EACH DAY...MAINLY SOUTHERN ZONES. FELSCH .MSO...NONE
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, 2:23 PM MDT | Severe Thunderstorm Warning | MSO | Powell | 52 min |
| Jul 12, 4:36 PM MDT | Flash Flood Warning | MSO | Granite, Ravalli | 114 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.