Alert archive / Montana / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 10, NWS Missoula, MT

July 11, 2001Missoula County, Montana

NWS Missoula, MT issued this severe thunderstorm warning at Jul 11, 2001, 6:10 PM MDT for Missoula County, Montana. It was in force for 50 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 11, 2001, 6:10 PM MDT (00:10 UTC)
Expired
Jul 11, 2001, 7:00 PM MDT
In force
50 min
Issued by
NWS Missoula, MT
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Missoula County, MT

The nearest sounding before it

Spokane, WA (KOTX), launched 00:00Z, 0.2 hours before the alert went out and 225 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.

Skew-T log-pSkew-T log-p diagram, Spokane, WA at 00:00Z on 2001-07-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Spokane, WA at 00:00Z on 2001-07-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 38 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2177 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
38 m²/s²
0-3 km storm-relative helicity
-13 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS55 KMSO 120012
SVRMSO

MTC063-120100-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MISSOULA MT
610 PM MDT WED JUL 11 2001

THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN MISSOULA COUNTY IN WEST CENTRAL MONTANA

* UNTIL 700 PM MDT

* AT 610 PM MDT...SPOTTERS REPORTED A SEVERE THUNDERSTORM 5 MILES  
  SOUTHWEST OF CLINTON...NEAR MILLER CREEK IN SOUTH MISSOULA...
  MOVING NORTHEAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE...
  OVER EAST MISSOULA AT 615 PM MDT
  OVER POTOMAC AT 630 PM MDT
  
DAMAGING WINDS IN EXCESS OF 55 MPH ARE LIKELY WITH THIS SEVERE 
THUNDERSTORM. 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 4677 11396 4664 11378 4694 11326 4712 11352

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 11, 2:31 PM MDT, 3 hours 39 minutes earlier.

Area forecast discussion, Jul 11, 2:31 PM MDT, 3 hours 39 minutes before
WESTERN MONTANA AND NORTH CENTRAL IDAHO FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MISSOULA MT
231 PM MDT WED JUL 11 2001

.SHORT TERM...MSX RADAR SHOWS SCATTERED SHOWERS AND THUNDERSTORMS
FORMING ACROSS LEMHI COUNTY THIS AFTERNOON. SATELLITE VISIBLE
IMAGERY AND SURFACE INDICATED SOME CU BUILDING UP ALONG THE
WESTERN BORDER OF THE CWA AND TO THE NORTH. HIGH PRESSURE REMAINS
OVER CENTRAL U.S. THROUGH THE FORECAST PERIOD WITH A SOUTHWEST FLOW
OVER THE CWA. WEAK SHORT WAVES CONTINUE TO MOVE IN THE FLOW AND
ACROSS THE CWA EACH DAY. STILL NOT TOO IMPRESSED BY ANY ON THE
WAVES MOVING ACROSS THE AREA...SO WILL KEEP THE POPS IN THE LOW
CHANCE CATEGORY. BY FRIDAY THE TROUGH OFF THE NORTHWEST PACIFIC COAST
MOVES CLOSER AND DEEPENS. TEMPERATURES COOL A FEW DEGREES THURSDAY
FROM TODAY AND THEN A FEW MORE DEGREES ON FRIDAY. KOLATA

.EXTENDED...MODELS IN GOOD AGREEMENT THROUGH EARLY SUNDAY WITH THE
AREA IN SOUTHWEST FLOW WITH A CUT OFF LOW DIGGING DOWN THE WEST COAST
INTO WASHINGTON. LATER SUNDAY INTO WEDNESDAY MRF/AVN MOVE DEEPENING
UPPER LOW INTO WESTERN OREGON WITH MRF MOVING IT OFF THE COAST BY
WEDNESDAY. ECMWF ON THE OTHER HAND WEAKENS THIS LOW MONDAY AND EJECTS
IT NORTHEAST INTO CENTRAL CANADA. SINCE AVN PREFERRED SHORT/MID TERM
MODEL AND IN MORE AGREEMENT WITH MRF WILL USE THEIR SOLUTION.  ALSO
MRF HAS BEEN MORE CONSISTENT THAN THE ECMWF. TEMPERATURES WILL BE
COOLER THROUGHOUT THE PERIOD...BUT NOT AS COOL AS PREVIOUS MODELS
INDICATE OR GUIDANCE. A CHANCE OF SHOWERS/THUNDERSTORMS EXPECTED EACH
DAY...EXCEPT SATURDAY WHERE THE NORTH MAY ESCAPE ANY ACTIVITY. BELTZ

.MSO...NONE.

The office that day

Everything else NWS Missoula, MT issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 12, 2:23 PM MDTSevere Thunderstorm WarningMSOPowell52 min
Jul 12, 4:36 PM MDTFlash Flood WarningMSOGranite, Ravalli114 min
Jul 12, 5:16 PM MDTSevere Thunderstorm WarningMSODeer Lodge, Granite, Powell59 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.