Alert archive / Montana / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 27, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at Jul 21, 2001, 7:08 PM MDT for Ravalli 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 21, 2001, 7:08 PM MDT (01:08 UTC)
- Expired
- Jul 21, 2001, 8:00 PM MDT
- In force
- 52 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 00:00Z, 1.1 hours before the alert went out and 254 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
- 64 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 2067 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 22 m²/s²
- 0-3 km storm-relative helicity
- 54 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 220109 SVRMSO MTC081-220200- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MISSOULA MT 708 PM MDT SAT JUL 21 2001 THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHERN RAVALLI COUNTY IN WEST CENTRAL MONTANA * UNTIL 800 PM MDT * AT 708 PM MDT...RADAR INDICATED A SEVERE THUNDERSTORM OVER CONNER...OR 25 MILES SOUTH OF HAMILTON...MOVING NORTH AT 25 MPH. * THE SEVERE THUNDERSTORM WILL BE... 7 MILES EAST OF HAMILTON...9 MILES SOUTHEAST OF WOODSIDE AT 745 PM MDT LARGE HAIL IS LIKELY WITH THIS SEVERE THUNDERSTORM. VERY HEAVY RAIN UP TO ONE INCH IN AN HOUR IS POSSIBLE WITH THIS STORM ALONG WITH FREQUENT LIGHTNING. FOR YOUR PROTECTION...GO INDOORS AND STAY AWAY FROM WINDOWS. MOVE TO HIGHER GROUND IF FLOODING IS OBSERVED. LAT...LON 4588 11419 4586 11393 4637 11380 4640 11416
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, 5 hours 18 minutes earlier.
Area forecast discussion, Jul 21, 1:50 PM MDT, 5 hours 18 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 21, 6:10 PM MDT | Flash Flood Warning | MSO | Ravalli | 110 min |
| Jul 21, 6:30 PM MDT | Severe Thunderstorm Warning | MSO | Granite, Ravalli | 45 min |
| Jul 21, 6:53 PM MDT | Flash Flood Warning | MSO | Ravalli | 112 min |
| Jul 21, 8:00 PM MDT | Flash Flood Warning | MSO | Ravalli | 2 hr |
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.