Alert archive / Montana / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 24, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at Jul 20, 2001, 8:53 PM MDT for Mineral County, Missoula 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 20, 2001, 8:53 PM MDT (02:53 UTC)
- Expired
- Jul 20, 2001, 9:45 PM MDT
- In force
- 52 min
- Issued by
- NWS Missoula, MT
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Mineral County, MT, Missoula County, MT
The nearest sounding before it
Spokane, WA (KOTX), launched 00:00Z, 2.9 hours before the alert went out and 170 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
- 257 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 2144 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 2 m²/s²
- 0-3 km storm-relative helicity
- 17 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 210253 SVRMSO MTC061-063-210345- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MISSOULA MT 853 PM MDT FRI JUL 20 2001 THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHEASTERN MINERAL COUNTY IN WEST CENTRAL MONTANA SOUTHWESTERN MISSOULA COUNTY IN WEST CENTRAL MONTANA * UNTIL 945 PM MDT * AT 853 PM MDT...RADAR INDICATED A SEVERE THUNDERSTORM 21 MILES SOUTHWEST OF FRENCHTOWN...OR 28 MILES WEST OF MISSOULA...MOVING NORTHEAST AT 40 MPH. * THE SEVERE THUNDERSTORM WILL BE... 3 MILES SOUTHEAST OF FRENCHTOWN AT 920 PM MDT DAMAGING WINDS IN EXCESS OF 55 MPH ARE LIKELY WITH THIS SEVERE THUNDERSTORM. LARGE HAIL IS POSSIBLE...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 4686 11479 4670 11464 4691 11404 4705 11423
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 20, 8:44 PM MDT, 9 minutes earlier.
Area forecast discussion, Jul 20, 8:44 PM MDT, 9 minutes before
WESTERN MONTANA AND NORTH CENTRAL IDAHO FORECAST DISCUSSION NATIONAL WEATHER SERVICE MISSOULA MT 844 PM MDT FRI JUL 20 2001 WILL UPDATE ZONES AND SFPMSO TO EXTEND FLASH FLOOD WATCH FOR THE SEVERELY BURNED AREAS OF SOUTHERN RAVALLI COUNTY IN WEST CENTRAL MONTANA THROUGH 7 AM SATURDAY. UPPER LOW CENTER LOCATED OVER THE CENTRAL WASHINGTON-OREGON BORDER SHOULD CONTINUE TO TRIGGER TSTMS... SOME SEVERE...OVER THE CWA TONIGHT. AROUND 7 PM THE TOWN OF COTTONWOOD NEAR GRANGEVILLE REPORTED 1 INCH HAIL. CWA BECOMES UNDER THE FAVORABLE LEFT FRONT SIDE OF UPPER LOW OVERNIGHT. STRONG 300/700 MB CONVERGENT/DIVERGENT COUPLET ASSOCIATED LEFT FRONT QUADRANT OF H3 70 KNOT JET DEVELOPS OVER CENTRAL ZONES AROUND 06Z. NEW ETA LITTLE FURTHER NORTH WITH THIS COUPLET SO WILL BUMP POPS UP OVER NORTHWEST MONTANA. WITH FLASH FLOODING HAVING ALREADY OCCURRED OVER AREAS SOUTHERN RAVALLI COUNTY EARLIER TODAY AND WITH GROUND ALREADY SATURATED...WILL NOT TAKE MUCH PCPN TO TRIGGER MORE FLASH FLOODING. HARMER .MSO...FLASH FLOOD WATCH FOR SOUTHERN RAVALLI COUNTY THROUGH 7 AM SATURDAY.
The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 5:26 PM MDT | Severe Thunderstorm Warning | MSO | Ravalli | 49 min |
| Jul 21, 5:34 PM MDT | Flash Flood Warning | MSO | Ravalli | 116 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.