Alert archive / Montana / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 16, NWS Missoula, MT

July 13, 2001Ravalli County, Montana

NWS Missoula, MT issued this severe thunderstorm warning at Jul 13, 2001, 2:32 PM MDT for Ravalli County, Montana. It was in force for 33 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 13, 2001, 2:32 PM MDT (20:32 UTC)
Expired
Jul 13, 2001, 3:05 PM MDT
In force
33 min
Issued by
NWS Missoula, MT
Area
Whole counties

County Ravalli County, MT

The nearest sounding before it

Spokane, WA (KOTX), launched 12:00Z, 8.5 hours before the alert went out and 250 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 12:00Z on 2001-07-13Temperature 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 12:00Z on 2001-07-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 20 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
2349 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
20 m²/s²
0-3 km storm-relative helicity
118 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

Open this sounding in Storm Lab

The text

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

000 
WUUS55 KMSO 132033
SVRMSO

MTC081-132105-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MISSOULA MT
232 PM MDT FRI JUL 13 2001

THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A

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

* UNTIL 305 PM MDT

* AT 232 PM MDT...RADAR INDICATED A SEVERE THUNDERSTORM 6 MILES
  SOUTHWEST OF CONNER...OR 25 MILES SOUTH OF HAMILTON...MOVING
  NORTHEAST AT 35 MPH.

* THE SEVERE THUNDERSTORM WILL REMAIN OVER REMOTE AREAS.

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.

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 13, 2:30 PM MDT, 2 minutes earlier.

Area forecast discussion, Jul 13, 2:30 PM MDT, 2 minutes before
WESTERN MONTANA AND NORTH CENTRAL IDAHO FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MISSOULA MT
230 PM MDT FRI JUL 13 2001

.SHORT TERM...MOIST SOUTHWEST FLOW OVER THE CWA TONIGHT.
SHOWERS/THUNDERSTORMS FIRING OFF ACROSS THE SOUTHERN ZONES THIS
AFTERNOON. THUNDERSTORMS ARE INCREASING ACROSS WESTERN MONTANA AND
NORTH CENTRAL IDAHO THIS AFTERNOON. LARGE AMOUNT OF MOISTURE IS
MOVING UP FROM THE SOUTHWEST AND SHOULD SUPPORT STRONG
THUNDERSTORMS. ON SATURDAY THE UPPER LEVEL FLOW BECOMES MORE
WESTERLY AND A LITTLE MORE STABLE...SO HAVE DECREASED THE POPS TO A
SLIGHT CHANCE. ON SUNDAY A SYSTEM FROM THE PACIFIC NORTHWEST MOVES
CLOSER AND BRINGS A BETTER CHANCE OF SHOWERS BY AFTERNOON. KOLATA

.EXTENDED...MODELS IN GOOD AGREEMENT FOR EXTENDED. PATTERN STAYS
CONSISTENT WITH UPPER TROF OVER THE PAC NORTHWEST AND SOUTHWEST FLOW
OVER CWA. DAYS 3 THRU 5 COOLER WITH CLOUDS AND SHOWERS. UPPER LOW
BEGINS TO MOVE ACROSS THE AREA ON WEDNESDAY. DRIER CONDITIONS FOR
DAYS 6&7 AS SFC HIGH BUILDS IN. TAD OF A WARM UP ON THURSDAY AND
FRIDAY. KPB

.MSO...SVR THUNDERSTORM WATCH UNTIL 7 PM MDT.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 12, 6:16 PM MDTSevere Thunderstorm WarningMSOPowell44 min
Jul 13, 5:43 PM MDTSevere Thunderstorm WarningMSOSilver Bow37 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.