Alert archive / Montana / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 71, NWS Great Falls, MT

July 11, 1998Fergus County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Jul 11, 1998, 5:43 PM MDT for Fergus County, Montana. It was in force for 47 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 11, 1998, 5:43 PM MDT (23:43 UTC)
Expired
Jul 11, 1998, 6:30 PM MDT
In force
47 min
Issued by
NWS Great Falls, MT
Area
Whole counties

County Fergus County, MT

The nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 11.7 hours before the alert went out and 106 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 1998-07-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 32 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 1998-07-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 51 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
32 J/kg
Mixed-layer CIN
-306 J/kg
Mixed-layer LCL
1932 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
51 m²/s²
0-3 km storm-relative helicity
52 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 KGTF 112343 RRA
SVRGTF
MTC027-120030-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREAT FALLS MT
543 PM MDT SAT JUL 11 1998


THE NATIONAL WEATHER SERVICE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN FERGUS COUNTY IN CENTRAL MONTANA

* UNTIL 630 PM MDT

* AT 541 PM MDT... DOPPLER RADAR AT GREAT FALLS INDICATED A SEVERE
  THUNDERSTORM 11 MILES SOUTH OF LEWISTOWN MOVING NORTHEAST AT 40
  MPH.

* SOME LOCATIONS IN OR NEAR THE PATH OF THIS STORM ARE...
  LEWISTOWN...   FORESTGROVE AND   HILGER.

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.

In the hours before

Local storm report, Jul 11, 11:44 AM MDT, 5 hours 59 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE GREAT FALLS, MT
1144 AM MDT SAT JUL 11 1998

TIME(MDT)  ......CITY LOCATION...... MT   ...EVENT.............
DATE(MDT)  ......COUNTY LOCATION....      ...REMARKS...........

0540 PM    4S GREAT FALLS            MT   WINDS GUST TO EST 65 MPH
07/10/98   CASCADE                        DESTROYED GARAGE.

0545 PM    GREAT FALLS               MT   HAIL 0.63 TO 0.75 INCH HAIL
07/10/98   CASCADE                        *.56 RAIN SHORT PERIOD OF TIME

0745PM     VALENTINE                 MT   WINDS BLEW OLD BUILDING AND
           FERGUS                         GARAGE DOWN.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 10, 6:25 PM MDTSevere Thunderstorm WarningTFXCascade35 min
Jul 10, 7:29 PM MDTSevere Thunderstorm WarningTFXFergus36 min
Jul 11, 2:29 PM MDTSevere Thunderstorm WarningTFXMadison61 min
Jul 11, 3:30 PM MDTSevere Thunderstorm WarningTFXGallatin65 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.