Alert archive / Montana / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 37, NWS Missoula, MT

September 25, 2001Missoula County, Ravalli County, Montana

NWS Missoula, MT issued this severe thunderstorm warning at Sep 25, 2001, 7:46 PM MDT for Missoula County, Ravalli County, Montana. It was in force for 74 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
Sep 25, 2001, 7:46 PM MDT (01:46 UTC)
Expired
Sep 25, 2001, 9:00 PM MDT
In force
74 min
Issued by
NWS Missoula, MT
Area
Whole counties; the outline is the Mesonet’s reconstruction

Counties Missoula County, MT, Ravalli County, MT

The nearest sounding before it

Spokane, WA (KOTX), launched 00:00Z, 1.8 hours before the alert went out and 222 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 2001-09-26Temperature 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 2001-09-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -75 square meters per square second.19395878Sfc1 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
1758 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
-75 m²/s²
0-3 km storm-relative helicity
97 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.

851 
WUUS55 KMSO 260145
SVRMSO
MTC063-081-260300-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MISSOULA MT
746 PM MDT TUE SEP 25 2001

THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A

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

* UNTIL 900 PM MDT

* AT 740 PM MDT...SPOTTERS REPORTED A SEVERE THUNDERSTORM OVER       
  HAMILTON AND IN THE SOUTHSIDE OF MISSOULA. THE STORM WAS           
  MOVING NORTH AT 10 TO 20 MPH.  EXPECT WIND GUSTS OF 60 TO 70 
  MPH WITH THESE STORMS.

* THE SEVERE THUNDERSTORM WILL BE...
  OVER NORTH MISSOULA BETWEEN 755 AND 805 PM... 
  FRENCHTOWN BETWEEN 800 AND 810 PM 745 PM MDT AND 
  CLINTON BETWEEN 810 AND 820 PM...
  
DAMAGING WINDS IN EXCESS OF 65 MPH ARE LIKELY WITH THIS SEVERE 
THUNDERSTORM. DANGEROUS LIGHTNING IS ALSO POSSIBLE WITH THESE 
STORMS. GO INDOORS AND STAY AWAY FROM WINDOWS. IF YOU ARE CAUGHT 
OUTSIDE...MOVE TO A WELL PROTECTED AREA.

LAT...LON 4605 11433 4612 11401 4689 11390 4689 11431

NESTER

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 Sep 25, 3:16 PM MDT, 4 hours 30 minutes earlier.

Area forecast discussion, Sep 25, 3:16 PM MDT, 4 hours 30 minutes before
WESTERN MONTANA AND NORTH CENTRAL IDAHO FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MISSOULA MT
316 PM MDT TUE SEP 25 2001

CORRECTED HIGHLIGHT SECTION BELOW

.SHORT TERM...DYNAMIC UPPER LOW OVER SOUTH CENTRAL OR EJECTS
NORTHWARD TONIGHT BRINGING MOISTURE AND DIFFLUENCE ALOFT INTO THE
CWA. EXPECT SHOWERS TO INCREASE ACROSS THE REGION WHILE THE AIR MASS
REMAINS UNSTABLE OVERNIGHT...THUNDERSTORMS MAY EVEN PERSIST IN THE
NORTH NEAR COLD POOL ALOFT TOWARD SUNRISE. MAIN PROBLEM IS DRY AIR AT
LOWER LEVELS LEADING TO EVAPORATION AND GUSTY WINDS DURING THE EARLY
EVENING HOURS. ALREADY SEEING GUSTS NEAR 50 MPH IN SOUTHWEST MT AT
20Z ALONG LEADING BAND OF CLOUDS AND SHOWERS ALOFT. STRONG SURFACE
LOW WITH PRESSURE COUPLET IN EASTERN WA AND A SLOW MOVING COOL FRONT
ACROSS CENTRAL ID...EVENTUALLY PUSH THROUGH WESTERN MT LATER THIS
EVENING. SOUTHERLY WINDS WILL BE SHIFTING TO WEST. AIR MASS MOISTENS
ENOUGH TO SEE MEASURABLE PRECIP ACROSS CLEARWATER MOUNTAIN ZONES INTO
NORTHWEST MT. LINGERING EFFECTS FROM WEAKENING TROUGH FOR A CHANCE OF
MORNING SHOWERS IN THE NORTH...THEN A DRYING TREND. GLANCING BLOW OF
NEXT SHORTWAVE IN SOUTHWEST FLOW FOR SLIGHT CHANCE WORDING NEAR THE
ID PANHANDLE WEDNESDAY NIGHT. RIDGE BUILDS OVER THE AREA THURSDAY
AS AN UPPER LOW DEEPENS OFF THE WEST COAST. AVN A LITTLE STRONGER
WITH THE LOW COMPARED TO ETA. WILL BUMP UP TO A CHANCE ON FRIDAY AS
THIS SYSTEM MOVES INLAND.  BOLDT

.LONG TERM...MODELS NOW ALL IN AGREEMENT REBUILDING STRONG RIDGE
OVER THE WEST EARLY NEXT WEEK. TAIL END OF SHORTWAVE EXITS SATURDAY
MORNING WITH SOME LINGERING CLOUD COVER...THEN CLEAR WITH WARM UP
SUNDAY AS THICKNESSES BACK UP NEAR 573. BY TUE...MRF HINTS AT
FLATTENING RIDGE...BUT STILL DRY WITH ABOVE NORMAL TEMPS.  SULLIVAN

.MSO...RED FLAG WARNING FOR ALL FIRE WEATHER ZONES 102 THROUGH 111
       TONIGHT.
       WIND ADVISORY MT ZONES 5>7 AND ID ZONES 6>10 THIS EVENING

...7-DAY SPOT TEMPS AND POPS...
LIB EBC 046/069 038/072 040/073 28731014
     BUUB 041/074 039/080 040/080 042/075 3600000000
FCA EBE 045/069 036/070 038/071 28730004
     BUUB 039/073 037/078 039/078 041/074 3600000000
POL BBE 053/070 048/071 048/072 28720004
     BUUB 048/072 044/076 045/076 047/074 3600000000
MSO BBE 046/072 038/075 040/074 28710003
     BUUB 041/075 039/080 040/080 042/077 3600000000
HMM BBE 046/072 039/075 042/075 28710002
     BUUB 042/076 040/081 042/081 044/078 3600000000
BTM BBB 040/071 033/074 036/075 28300001
     BUUB 037/073 033/077 034/077 037/074 3600000000
ORO BBE 054/076 052/080 053/078 28700003
     BUUB 052/080 048/085 050/085 052/082 3600000000
GRV BBE 050/072 046/075 047/074 28700003
     BUUB 046/075 043/080 045/080 048/077 3600000000
SMN BBB 040/073 036/076 039/075 28300001
     BUUB 040/075 035/079 036/079 039/077 3600000000

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.