Alert archive / Montana / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 19, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at Jul 15, 2001, 4:31 PM MDT for Granite County, Montana. It was in force for 44 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jul 15, 2001, 4:31 PM MDT (22:31 UTC)
- Expired
- Jul 15, 2001, 5:15 PM MDT
- In force
- 44 min
- Issued by
- NWS Missoula, MT
- Area
- Whole counties
County Granite County, MT
The nearest sounding before it
Great_falls, MT (KTFX), launched 12:00Z, 10.5 hours before the alert went out and 246 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
- 128 J/kg
- Mixed-layer CIN
- -182 J/kg
- Mixed-layer LCL
- 2272 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- -29 m²/s²
- 0-3 km storm-relative helicity
- 33 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 152229 SVRMSO MTC039-152315- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MISSOULA MT 431 PM MDT SUN JUL 15 2001 THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... GRANITE COUNTY IN WEST CENTRAL MONTANA NORTHEASTERN RAVALLI COUNTY IN WEST CENTRAL MONTANA * UNTIL 515 PM MDT * AT 428 PM MDT...RADAR INDICATED A SEVERE THUNDERSTORM 14 MILES NORTH OF PHILIPSBURG...OR 16 MILES SOUTHWEST OF DRUMMOND...MOVING NORTHEAST AT 20 MPH. * THE SEVERE THUNDERSTORM WILL BE OVER DRUMMOND AT 505 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...MOVE TO A WELL PROTECTED AREA. RPN
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 15, 1:54 PM MDT, 2 hours 37 minutes earlier.
Area forecast discussion, Jul 15, 1:54 PM MDT, 2 hours 37 minutes before
WESTERN MONTANA AND NORTH CENTRAL IDAHO FORECAST DISCUSSION NATIONAL WEATHER SERVICE MISSOULA MT 154 PM MDT SUN JUL 15 2001 .SHORT TERM...MODELS CONSISTENT IN DROPPING AN UNSEASONABLY STRONG UPPER TROUGH INTO WA STATE MONDAY. THIS WILL BRING SIGNIFICANT COOLING TO THE AREA ON MONDAY. AHEAD OF THE UPPER TROF A STRONG VORT OVER CENTRAL ID WILL TRACK NE IN SOUTHWESTERLY FLOW ALOFT INTO SW MT LATER THIS AFTERNOON. AT THE PRESENT TIME AN AREA OF STRONGER CONVECTION IS DEVELOPING JUST AHEAD OF VORT CENTER IN A DRY SLOT IN SOUTHEAST IDAHO AND WESTERN LEMHI COUNTIES. OTHER ISOLATED CONVECTION IS POPPING UP IN SRN HALF OF CWA. LIGHT SHOWERS CONTINUE ALONG DEFORMATION AXIS INTO NW MT. CONVECTION WILL CONTINUE TO DEVELOP WITH AFTERNOON HEATING AND SPREAD NE. WITH PRECIP. WATER VALUES OF GREATER THAN 0.75...BRIEF HEAVY RAIN IS POSSIBLE. STORMS ARE MOVING FAST ENOUGH THAT SIGNIFICANT PROBLEMS ARE NOT LIKELY. BUT WILL MONITOR PRECIP TOTAL IN BURN AREAS CLOSELY. CONVECTION WILL DIMINISH THIS EVENING AS VORT TRACKS NE OF AREA. ON MONDAY MORNING A DEVELOPING FRONTAL ZONE WILL MOVE SLOWLY EAST THROUGH CWA FORCING SHOWERS AND POSSIBLY A FEW THUNDERSTORMS AS LI VALUES REMAIN AROUND 0 TO -1 AS 700 MB COOL TO -2 TO +2 CELCIUS. NGM MOS IS MUCH WARMER ON THE HIGH TEMPS FOR MONDAY AND TUESDAY THAN THE MAV MOS. NGM TEMPS ARE CLOSE TO ADIABATIC VALUES...BUT WITH CLOUD COVER AND SHOWERS WILL TREND BETWEEN THE MOS VALUES...SO MAINLY 60S NORTH AND 70S SOUTH. TEMPS WILL COOL A LITTLE MORE ON TUESDAY AS UPPER LOW EDGES SLOWLY EAST. AVN AND MESOETA WRAP A VORT LOBE AROUND UPPER LOW AS JET STREAK ROUNDS BASE OF TROUGH. DRY MID LEVEL AIR ADVECTS INTO MOST OF CWA...EXCEPT OVER FAR NW AND SE WHERE WILL CONTINUE THE BEST CHANCE OF SHOWERS. PETRESCU .EXTENDED...MODELS IN GOOD AGREEMENT WITH MOVING A TROUGH ACROSS THE AREA ON WEDNESDAY...COOLING TEMPERATURES AND GIVING THE BEST CHANCE OF SHOWERS/THUNDERSTORMS. THURSDAY THROUGH SATURDAY A LOW DEVELOPS AND STAYS OFF THE PACIFIC NORTHWEST COAST...KEEPING THE CWA IN A SOUTHWEST FLOW WITH A FEW WEAK DISTURBANCES MOVING THROUGH...SO WILL KEEP A SLIGHT CHANCE OF SHOWERS. BY SUNDAY A WEAK RIDGE BUILDS OVER THE CWA SO WILL GO DRY AND WARMER. KOLATA .MSO...NONE.
The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 15, 3:31 PM MDT | Flash Flood Warning | MSO | Ravalli | 2 hr |
| Jul 15, 4:20 PM MDT | Severe Thunderstorm Warning | MSO | Missoula | 30 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.