Alert archive / Montana / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 87, NWS Great Falls, MT
NWS Great Falls, MT issued this severe thunderstorm warning at Aug 21, 1998, 4:23 AM MDT for Blaine 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
- Aug 21, 1998, 4:23 AM MDT (10:23 UTC)
- Expired
- Aug 21, 1998, 5:10 AM MDT
- In force
- 47 min
- Issued by
- NWS Great Falls, MT
- Area
- Whole counties
County Blaine County, MT
The radar
The Glasgow radar (KGGW), 174 km from the middle of the area, began a volume at 10:26 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Great_falls, MT (KTFX), launched 00:00Z, 10.4 hours before the alert went out and 163 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.
- Mixed-layer CAPE
- 365 J/kg
- Mixed-layer CIN
- -74 J/kg
- Mixed-layer LCL
- 2966 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 45 m²/s²
- 0-3 km storm-relative helicity
- 132 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.8
The text
As transmitted, in the capitals the NWS used until 2016.
665 WUUS1 KGTF 211028 RRA SVRGTF MTC005-211110- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE GREAT FALLS MT 423 AM MDT FRI AUG 21 1998 THE NATIONAL WEATHER SERVICE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTH CENTRAL BLAINE COUNTY IN NORTH CENTRAL MONTANA * UNTIL 510 AM MDT * AT 421 AM MDT... DOPPLER RADAR AT GREAT FALLS INDICATED A SEVERE THUNDERSTORM IN THE VICINITY OF HARLEM MOVING NORTH AT 30 MPH. * SOME LOCATIONS IN OR NEAR THE PATH OF THIS STORM ARE... FORT BELKNAP AND HOGELAND.
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, Aug 20, 10:50 PM MDT, 5 hours 33 minutes before
STORM REPORT NATIONAL WEATHER SERVICE GREAT FALLS, MT 1050 PM MDT THU AUG 20 1998 TIME(MDT) ......CITY LOCATION...... MT ...EVENT............. DATE(MDT) ......COUNTY LOCATION.... ...REMARKS........... 0548 PM 10 S GREAT FALLS MT 60 MPH WIND GUST 08/20/98 CASCADE 0910 PM GREAT FALLS MT 0.75 INCH HAIL 08/20/98 CASCADE JB
Local storm report, Aug 20, 10:50 PM MDT, 5 hours 33 minutes before
STORM REPORT NATIONAL WEATHER SERVICE GREAT FALLS, MT 1050 PM MDT THU AUG 20 1998 TIME(MDT) ......CITY LOCATION...... MT ...EVENT............. DATE(MDT) ......COUNTY LOCATION.... ...REMARKS........... 0548 PM 10 S GREAT FALLS MT 60 MPH WIND GUST 08/20/98 CASCADE 0910 PM GREAT FALLS MT 0.75 INCH HAIL 08/20/98 CASCADE JB
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; radar from the NEXRAD Level II archive.