Alert archive / Montana / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 7, NWS Great Falls, MT

June 30, 1998Cascade County, Lewis and Clark County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Jun 30, 1998, 4:23 PM MDT for Cascade County, Lewis and Clark County, Montana. It was in force for 57 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
Jun 30, 1998, 4:23 PM MDT (22:23 UTC)
Expired
Jun 30, 1998, 5:20 PM MDT
In force
57 min
Issued by
NWS Great Falls, MT
Area
Whole counties

Counties Cascade County, MT, Lewis and Clark County, MT

The nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 10.4 hours before the alert went out and 99 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 1998-06-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2 joules per kilogram.LCLLFCEL10008507005003002001001 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 1998-06-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -48 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
2 J/kg
Mixed-layer CIN
-201 J/kg
Mixed-layer LCL
1172 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
-48 m²/s²
0-3 km storm-relative helicity
64 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 
TTAA00 KBIL 302222 RRA
SVRGTF
MTC013-049-302320-

BULLETIN - IMMEDIATE BROADCAST REQUIRED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREAT FALLS MT
ISSUED BY NATIONAL WEATHER SERVICE BILLINGS MT
523 PM CDT TUE JUN 30 1998

THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN CASCADE COUNTY IN NORTH CENTRAL MONTANA
  EAST CENTRAL LEWIS AND CLARK COUNTY IN WEST CENTRAL MONTANA

* UNTIL 520 PM MDT (620 PM CDT)

* AT 420 PM MDT...SPOTTERS REPORTED ONE INCH HAIL WITH A SEVERE
THUNDERSTORM AT WOLF CREEK. THE SEVERE THUNDERSTORM IS MOVING EAST
SOUTHEAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  WOLF CREEK AND CRAIG

DAMAGING WINDS AND LARGER HAIL ARE LIKELY. GO INSIDE A STURDY
BUILDING AND STAY AWAY FROM WINDOWS!

DB/RASCH



&

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 30, 2:15 PM MDTSevere Thunderstorm WarningTFXLewis and Clark60 min
Jun 30, 5:12 PM MDTSevere Thunderstorm WarningTFXMeagher48 min

Nearby

Severe Thunderstorm Warnings in Montana, 1998Every severe thunderstorm warning in 1998

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.