Alert archive / Montana / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 14, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at Jul 12, 2001, 6:16 PM MDT for Powell County, Montana. It was in force for 44 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
- Jul 12, 2001, 6:16 PM MDT (00:16 UTC)
- Expired
- Jul 12, 2001, 7:00 PM MDT
- In force
- 44 min
- Issued by
- NWS Missoula, MT
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Powell County, MT
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 12, 6:17 PM MDT | Hail 0.75 | Deer Lodge, 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 00:00Z, 0.3 hours before the alert went out and 194 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
- 255 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 1606 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 36 m²/s²
- 0-3 km storm-relative helicity
- 101 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS55 KMSO 130018 SVRMSO MTC077-130100- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MISSOULA MT 616 PM MDT THU JUL 12 2001 THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHEASTERN POWELL COUNTY IN WEST CENTRAL MONTANA * UNTIL 700 PM MDT * AT 616 PM MDT...SPOTTERS REPORTED A SEVERE THUNDERSTORM 5 MILES SOUTH OF DEER LODGE...MOVING NORTHEAST AT 25 MPH. * THE SEVERE THUNDERSTORM WILL REMAIN SOUTH OF DEER LODGE AND MOVE OVER REMOTE AREAS. LARGE HAIL IS LIKELY WITH THIS SEVERE THUNDERSTORM...IN ADDITION TO 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 4637 11289 4622 11276 4643 11220 4661 11241
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, 3 hours 46 minutes earlier.
Area forecast discussion, Jul 12, 2:30 PM MDT, 3 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 13, 2:32 PM MDT | Severe Thunderstorm Warning | MSO | Ravalli | 33 min |
| Jul 13, 5:43 PM MDT | Severe Thunderstorm Warning | MSO | Silver Bow | 37 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.