Alert archive / Montana / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 25, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at Jul 21, 2001, 5:26 PM MDT for Ravalli County, Montana. It was in force for 49 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 21, 2001, 5:26 PM MDT (23:26 UTC)
- Expired
- Jul 21, 2001, 6:15 PM MDT
- In force
- 49 min
- Issued by
- NWS Missoula, MT
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Ravalli County, MT
The nearest sounding before it
Spokane, WA (KOTX), launched 12:00Z, 11.4 hours before the alert went out and 270 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
- 69 J/kg
- Mixed-layer CIN
- -159 J/kg
- Mixed-layer LCL
- 905 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 8 m²/s²
- 0-3 km storm-relative helicity
- 13 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 212328 SVRMSO MTC081-220015- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MISSOULA MT 526 PM MDT SAT JUL 21 2001 THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EASTERN RAVALLI COUNTY IN WEST CENTRAL MONTANA * UNTIL 615 PM MDT * AT 526 PM MDT...RADAR INDICATED A SEVERE THUNDERSTORM 5 MILES SOUTH OF SULA...MOVING NORTHEAST AT 25 MPH. * THE SEVERE THUNDERSTORM WILL MOVE EAST OF SULA BY 545 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...kMOVE TO A WELL PROTECTED AREA. LAT...LON 4575 11413 4571 11388 4615 11380 4618 11408
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 21, 1:50 PM MDT, 3 hours 36 minutes earlier.
Area forecast discussion, Jul 21, 1:50 PM MDT, 3 hours 36 minutes before
WESTERN MONTANA AND NORTH CENTRAL IDAHO FORECAST DISCUSSION NATIONAL WEATHER SERVICE MISSOULA MT 150 PM MDT SAT JUL 21 2001 .SHORT TERM...AVN HANDLING EJECTING SHORTWAVE MOVING INTO SOUTHEAST OREGON AT BASE OF TROUGH BETTER THAN 12Z ETA. THIS FEATURE HOLDS TOGETHER INTO THE LATE EVENING TO ENHANCE CONVECTION CURRENTLY FIRING OVER SOUTHERN ZONES. PWATS DOWN FROM YESTERDAY AND STILL A LITTLE UNCERTAIN ABOUT MODEL DIFFERENCES THIS EVENING...SO NO FLASH FLOOD WATCH PLANNED. WITH DRIER AIR AROUND CLOUDBASE LEVEL AND LOWER WETBULB ZEROES...WILL THROW IN MENTION OF GUSTY WINDS AND HAIL FOR SOME AREAS. MORE DISORGANIZED SHORTWAVE ENERGY DROPPING DOWN FROM SOUTHWEST CANADA WILL KEEP SHOWERS AND A FEW THUNDERSTORMS GOING THROUGH THE MORNING ACROSS THE NORTHERN ZONES. FOR THE REMAINDER OF THE SHORT TERM...STILL DEALING WITH TROUGH FOR CONTINUED INSTABILITY AND WEAK DYNAMICS SUPPORTING SHOWERS AND THUNDERSTORMS. LITTLE BETTER CHANCE IN NORTHWEST MONTANA TOMORROW AS NORTHERN WAVE AXIS DROPS THROUGH...SO WILL GO CATEGORICAL CONVECTIVE WORDING THERE...OTHERWISE ISOLATED TO SCATTERED ACROSS THE BOARD. SIGLER .EXTENDED...WEAK TROUGH LIFTS NORTH DAY3/4 (TUE/WED) WITH RISING HEIGHTS AND WARMING TREND. WILL KEEP SLIGHT CHANCE POPS MENTIONED THROUGH DAY5 (THU) WITH MODELS ADVERTISING GENERAL TROFINESS OVER REGION. UPPER RIDGE OVER THE 4-CORNERS AREA RE-ESTABLISHING ITSELF TOWARD THE END OF THE PERIOD...FOR TYPICAL WARM DRY CONDITIONS. MSJ .MSO...NONE.
The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 8:53 PM MDT | Severe Thunderstorm Warning | MSO | Mineral, Missoula | 52 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.