Alert archive / Montana / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 20, NWS Missoula, MT

July 16, 2001Powell County, Montana

NWS Missoula, MT issued this severe thunderstorm warning at Jul 16, 2001, 1:59 PM MDT for Powell County, Montana. It was in force for 46 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 16, 2001, 1:59 PM MDT (19:59 UTC)
Expired
Jul 16, 2001, 2:45 PM MDT
In force
46 min
Issued by
NWS Missoula, MT
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Powell County, MT

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jul 16, 1:45 PM MDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 8.0 hours before the alert went out and 196 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, Great_falls, MT at 12:00Z on 2001-07-16Temperature 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, Great_falls, MT at 12:00Z on 2001-07-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 15 square meters per square second.1939Sfc1 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
1797 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
15 m²/s²
0-3 km storm-relative helicity
56 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 162003
SVRMSO

MTC077-162045-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MISSOULA MT
159 PM MDT MON JUL 16 2001

THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A

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

* UNTIL 245 PM MDT

* AT 159 PM MDT...RADAR INDICATED SEVERE THUNDERSTORMS 10 MILES
  WEST OF DEER LODGE AND 10 MILES EAST OF DEER LODGE...MOVING 
  NORTHEAST AT 20 MPH.

* THE SEVERE THUNDERSTORMS WILL REMAIN OVER RURAL SOUTHEAST POWELL
  COUNTY.

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS AND HAIL...ALONG WITH
FREQUENT LIGHTNING AND HEAVY RAIN. FOR YOUR PROTECTION...GO INDO^ORS
AND STAY AWAY FROM WINDOWS. IF YOU ARE CAUGHT OUTSIDE...MOVE TO A
WELL PROTECTED AREA.


LAT...LON 4640 11304 4626 11262 4652 11233 4675 11266

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 16, 8:51 AM MDT, 5 hours 8 minutes earlier.

Area forecast discussion, Jul 16, 8:51 AM MDT, 5 hours 8 minutes before
WESTERN MONTANA AND NORTH CENTRAL IDAHO FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MISSOULA MT
851 AM MDT MON JUL 16 2001

.SHORT TERM...UNSEASONABLY COLD UPPER TROF CONTINUES TO DIG INTO WA
STATE. NICE BAROCLINIC ZONE WITH WIDESPREAD PRECIP IS CONTINUING TO
DEVELOP ALONG EAST SIDE OF TROF FROM EXTREME NW MT TO ERN OR. A FEW
LIGHTNING STRIKES REPORTED IN CENTRAL ID IN WARM SECTOR AHEAD OF
FRONT. EXPECT THE FRONTAL BAND TO EDGE SLOWLY EASTWARD TODAY WITH
LIKELY POPS EVERYWHERE. DAYTIME HEATING IN THE WARM SECTOR WILL
DESTABILIZE ATMOSPHERE OVER SRN CWA THIS AFTERNOON FOR THUNDERSTORM
DEVELOPMENT. THE POTENTIAL FOR LOCALLY HEAVY RAIN WITH ANY
THUNDERSTORM EXISTS SO WILL CONTINUE FLASH FLOOD WATCH FOR THE BURN
AREAS. INSTABILITY IS ONLY MARGINAL...BUT CAN NOT RULE A SEVERE CELL
OR TWO SE CWA.  FRONTAL BAND STALLS AND WEAKENS OVER ERN CWA
OVERNIGHT FOR A CONTINUED SHOWER THREAT AS A VORT LOBE ROUNDS THE
BASE OF THE TROF EARLY TUESDAY. THE AIRMASS BECOMES SOMEWHAT DRIER
AND MORE STABLE ON TUESDAY...BUT WITH COLD AIR ALOFT THE THREAT OF
WIDELY SCATTERED SHOWERS WILL CONTINUE. MINOR UPDATES
PLANNED. PETRESCU

.MSO...FLASH FLOOD WATCH FOR THE BURN AREAS OF RAVALLI COUNTY TODAY.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 16, 2:35 PM MDTSevere Thunderstorm WarningMSOSilver Bow25 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.