Alert archive / Montana / Severe Thunderstorm Warnings in 1988
Severe Thunderstorm Warning 21, NWS Great Falls, MT
NWS Great Falls, MT issued this severe thunderstorm warning at Jul 5, 1988, 1:51 PM MDT for Cascade County, Montana. It was in force for 69 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Jul 5, 1988, 1:51 PM MDT (19:51 UTC)
- Expired
- Jul 5, 1988, 3:00 PM MDT
- In force
- 69 min
- Issued by
- NWS Great Falls, MT
- Area
- Whole counties
County Cascade County, MT
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 5, 2:49 PM MDT | Hail 0.75 | Cascade, MT |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Great Falls, MT (KGTF), launched 12:00Z, 7.9 hours before the alert went out and 19 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
- 133 J/kg
- Mixed-layer CIN
- -358 J/kg
- Mixed-layer LCL
- 830 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 123 m²/s²
- 0-3 km storm-relative helicity
- 137 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KGTF 051954 RRA
SVRGTF
MTC013-052100-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREAT FALLS MT
151 PM MDT TUE JUL 5 1988
THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 300 PM MDT
FOR PEOPLE IN THE FOLLOWING COUNTY...
IN NORTHWEST MONTANA
...CASCADE INCLUDING THE CITY OF GREAT FALLS...
RADAR INDICATES A LIKELY SEVERE THUNDERSTORM IN NORTHEASTERN LEWIS AND
CLARK COUNTY THAT WILL MOVE INTO WESTERN CASCADE COUNTY SOON
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM O"N THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.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 5, 1:43 PM MDT, 8 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE GREAT FALLS, MT
141 PM MDT TUE JUL 05 1988
DATE/TIME DESCRIPTION
7/5 1930Z 8-10 MILES W OF HLN 1 INCH HAIL REPORTED
BY RELIABLE OBSERVER. DAMAGED CARS .48 INCH
IN DOWNPOUR.The office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 5, 2:23 PM MDT | Severe Thunderstorm Warning | TFX | Teton | 52 min |
| Jul 5, 2:58 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau | 62 min |
| Jul 5, 3:53 PM MDT | Severe Thunderstorm Warning | TFX | Hill, Liberty | 67 min |
| Jul 5, 4:01 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau | 44 min |
| Jul 5, 4:09 PM MDT | Severe Thunderstorm Warning | TFX | Hill | 66 min |
| Jul 5, 5:10 PM MDT | Severe Thunderstorm Warning | TFX | Blaine | 65 min |
| Jul 5, 5:13 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Hill, Liberty | 62 min |
| Jul 5, 5:42 PM MDT | Tornado Warning | TFX | Chouteau, Hill, Liberty | 33 min |
Nearby
Severe Thunderstorm Warnings in Montana, 1988Every severe thunderstorm warning in 1988
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.