Alert archive / Montana / Severe Thunderstorm Warnings in 1989
Severe Thunderstorm Warning 13, NWS Great Falls, MT
NWS Great Falls, MT issued this severe thunderstorm warning at Jul 30, 1989, 7:35 PM MDT for Fergus County, Montana. It was in force for 55 min.
The area
The counties it named.
The facts
- Issued
- Jul 30, 1989, 7:35 PM MDT (01:35 UTC)
- Expired
- Jul 30, 1989, 8:30 PM MDT
- In force
- 55 min
- Issued by
- NWS Great Falls, MT
- Area
- Whole counties
County Fergus County, MT
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
The nearest sounding before it
Great_falls, MT (KTFX), launched 00:00Z, 1.6 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.
- Mixed-layer CAPE
- 29 J/kg
- Mixed-layer CIN
- -386 J/kg
- Mixed-layer LCL
- 3636 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 31 m²/s²
- 0-3 km storm-relative helicity
- 109 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 310136
SVRGTF
MTC027-310230-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREAT FALLS MT
735 PM MDT SUN JUL 30 1989
THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 830 PM MDT
FOR PEOPLE IN THE FOLLOWING COUNTY...
IN MONTANA
...WESTERN FERGUS ...INCLUDING LEWISTOWN
AT 728 PM MDT...ABOUT 15 MILES WEST OF LEWISTOWN...WINDS WERE CLOCKED
AT 46 GUSTING TO 61 MPH. HEAVY RAINS HAVE ALSO BEEN ASSOCIATED WITH
THIS STORM SYSTEM WHICH IS MOVING EAST ABOUT 20 MPH.
RESIDENTS IN WESTERN FERGUS COUNTY SHOULD BE ON THE ALERT FOR DAMAGING
WINDS...POSSIBLE LARGE HEAIL AND HEAVY RAIN ALONG WITH DEADLY
LIGHTNING.
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 ON 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
Special weather statement, Jul 30, 5:48 PM MDT, 1 hour 47 minutes before
SPECIAL WEATHER STATEMENT...CORRECTION...3RD PARAGPH NATIONAL WEATHER SERVICE GREAT FALLS, MT 546 PM MDT SUN JUL 30 1989 ...SEVERE THUNDERSTORM WATCH MUCH OF WESTERN MONTANA EAST OF THE DIVIDE TONIGHT UNTIL 10 PM... AN AREA OF STRONG THUNDERSTORMS BOUNDED BY A LINE FROM 35 MILES WEST OF LEWISTOWN TO GREAT FALLS THEN WEST TO THE DIVIDE AND SOUTH TO HELENA... IS SHOWN BY RADAR AND SATELLITE THIS EVENING. THUNDERSTORM TOPS HAVE BEEN MEASURED BY RADAR TO BETWEEN 45 AND 50 THOUSAND FEET BETWEEN GREAT FALLS AND LEWISTOWN. THE MAIN CONCENTRATION OF STORM CELLS IS ON A NORTH/SOUTH LINE FROM NEAR CHOTEAU THROUGH HELENA TO DILLON. THESE STORMS ARE MOVING IN A NORTHEASTERLY DIRECTION AROUND 35 MPH. AT 530 PM TOWNSEND...SOUTHEAST OF HELENA...REPORTED WINDS TO 45 MPH. HAIL NEAR 1 INCH IN DIAMETER FELL JUST SOUTH OF LINCOLN MONTANA. RESIDENTS IN THE WATCH AREA SHOULD PAY CLOSE ATTENTION TO TONIGHTS THUNDERSTORM ACTIVITY AS DAMAGING WINDS...LARGE HAIL...HEAVY RAIN AND DEADLY LIGHTNING ARE ALL POSSIBLE IN AND AROUND THE WATCH AREA. BE PREPARED TO TAKE SHELTER IF ANY OF THESE CONDITIONS ARE OBSERVED. END...
Special weather statement, Jul 30, 6:30 PM MDT, 1 hour 5 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE HELENA, MT 630 PM MDT SUN JUL 30 1989 SEVERE THUNDERSTORM WARNING FOR HELENA...TOWNSEND AND DEER LODGE EXPIRES... ...SEVERE THUNDERSTORM WATCH CONTINUES FOR MUCH OF WESTERN MONTANA EAST OF THE DIVIDE TONIGHT UNTIL 10 PM... THE SEVERE THUNDERSTORM WARNING FOR JEFFERSON...BROADWATER...POWELL... LEWIS AND CLARK...AND MEAGHER COUNTIES EXPIRED AT 615 PM MDT THIS SUNDAY EVENING. THE THUNDERSTORMS MOVED NORTHEAST INTO CASCADE COUNTY MONTANA AND A WARNING HAS BEEN ISSUED FOR THAT COUNTY UNTIL 800 PM MDT THIS EVENING. THE SEVERE THUNDERSTORM WATCH IS STILL IN EFFECT UNTIL 10 PM MDT..HOWEVER. NEW THUNDERSTORMS ARE FORMING IN A SCATTERED BAND ALONG THE CONTINENTAL DIVIDE. PERSONS IN THE ENTIRE WATCH AREA SHOULD CONTINUE TO MONTIOR WEATHER CONDITIONS UNTIL THE WATCH EXPIRES OR IS CANCELLED. < AT 625 PM MDT...NATIONAL WEATHER SERVICE RADAR AND LIGHTNING CHARTS INDICATED NEW THUNDERSTORMS FROM JUST WEST LINCOLN EXTENDING SOUTH TO NEAR BUTTE..IN MONTANA. THE INDIVIDUAL THUNDERSTORMS WERE MOVING TO THE NORTHEAST AT 30 MILES AN HOUR. PERSONS SHOULD BE PREPARED FOR POSSIBLE LARGE HAIL...DAMAGING WINDS AND DANGEROUS LIGHTNING STRIKECS TO GROUND OBJECTS AS THE THUNDERSTORMS MOVE NORTHEAST ACROSS SOUTHWEST MONTANA. BE PREPARED TO TAKE SHELTER IF ANY OF THESE CONDITIONS ARE OBSERVED. MHOON
Special weather statement, Jul 30, 6:32 PM MDT, 1 hour 3 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE HELENA, MT 625 PM MDT SUN JUL 30 1989 ...SEVERE THUNERSTORM FOR HELENA...TOWNSEND AND DEER LODGE EXPIRES... ...SEVERE THUNDERSTORM WATCH CONTINUES FOR MUCH OF WESTERN MONTANA EAST OF THE DIVIDE TONIGHT UNTIL 10 PM... THE SEVERE THUNDERSTORM WARNING FOR JEFFERSON...BROADWATER...POWELL... LEWIS AND CLARK...AND MEAGHER COUNTIES EXPIRED AT 615 PM MDT THIS SUNDAY EVENING. THE THUNDERSTORMS MOVED NORTHEAST INTO CASCADE COUNTY MONTANA AND A WARNING HAS BEEN ISSUED FOR THAT COUNTY UNTIL 800 PM MDT THIS EVENING. THE SEVERE THUNDERSTORM WATCH IS STILL IN EFFECT UNTIL 10 PM MDT..HOWEVER. NEW THUNDERSTORMS ARE FORMING IN A SCATTERED BAND ALONG THE CONTINENTAL DIVIDE. PERSONS IN THE ENTIRE WATCH AREA SHOULD CONTINUE TO MONTIOR WEATHER CONDITIONS UNTIL THE WATCH EXPIRES OR IS CANCELLED. < AT 625 PM MDT...NATIONAL WEATHER SERVICE RADAR AND LIGHTING CHARTS INDICATED NEW THUNDERSTORMS FROM WEST LINCOLN EXTENDING SOUTH TO NEAR BUTTE. THE INDIVIDUAL THUNDERSTORMS WERE MOVING TO THE NORTHEAST AT 30 MILES AN HOUR. PERSONS SHOULD BE PREPARED FOR POSSIBLE LARGE HAIL...DAMAGING WINDS AND DANGEROUS LIGHTNING STRIKES TO GROUND OBJECTS AS T@HE THUNDERSTORMS MOVE NORTHEAST ACROSS SOUTHWEST MONTANA. BE PREPARED TO TAKE SHELTER IF ANY OF THESE CONDITIONS ARE OBSERVED. MHOON
Special weather statement, Jul 30, 7:28 PM MDT, 7 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE HELENA, MT 730 PM MDT SUN JUL 30 1989 ...SEVERE THUNDERSTORM WATCH CONTINUES FOR MUCH OF WESTERN MONTANA EAST OF THE DIVIDE TONIGHT UNTIL 10 PM... AT 7:25 PM MDT THIS SUNDAY EVENING...NATIONAL WEATHER SERVICE RADAR AND LIGHTNING DEPICTION CHARTS WERE INDICATING SCATTERED THUNDERSTORMS TO THE FAR NORTHWEST OF HELENA IN NORTHERN POWELL AND NORTHERN LEWIS AND CLARK COUNTIES OF MONTANA. THESE THUNDERSTORMS WERE MOVING TO THE NORTHEAST AT ABOUT 30 MILES AN HOUR. OTHER THUNDERSTORMS WERE IN SCATTERED BAND FROM GREAT FALLS SOUTHEAST INTO MEAGHER AND JEFFERSON COUNTIES. THEY WERE ALSO MOVING TO THE NORTHEAST AT 30 MILES AN HOUR. A SEVERE THUNDERSTORM CONTINUES FOR THE AREA UNTIL 1000 PM MDT THIS SUNDAY. < PERSONS SHOULD BE PREPARED FOR POSSIBLE LARGE HAIL...DAMAGING WINDS AND DANGEROUS LIGHTNING STRIKES TO GROUND OBJECTS AS THE THUNDERSTORMS MOVE NORTHEAST ACROSS SOUTHWEST MONTANA.v BE PREPARED TO TAKE SHELTER IF ANY OF THESE CONDITIONS ARE OBSERVED. MHOON
Local storm report, Jul 30, 7:30 PM MDT, 5 minutes before
STORM REPORT NATIONAL WEATHER SERVICE GREAT FALLS, MT 724 PM MDT SUN JUL 30 1989 645 PM MDT...NEIHARD MONTANA...45MI SE GTF...MARBLE SIZED HAIL. WIND EVENTS... 1856 PM...35 W LWT...54G 69 MPH 1855 PMy...NE GEYSER/45SE GTF/...36G 46MPH WSFO GREAT FALLS
Special weather statement, Jul 30, 7:30 PM MDT, 5 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HELENA, MT
730 PM MDT SUN JUL 30 1989
...SEVERE THUNDERSTORM WATCH CONTINUES FOR MUCH OF WESTERN MONTANA EAST
OF THE DIVIDE TONIGHT UNTIL 10 PM...
AT 7:25 PM MDT THIS SUNDAY EVENING...NATIONAL WEATHER SERVICE RADAR
AND LIGHTNING DEPICTION CHARTS WERE INDICATING SCATTERED THUNDERSTORMS
TO THE FAR NORTHWEST OF HELENA IN NORTHERN POWELL AND NORTHERN LEWIS
AND CLARK COUNTIES OF MONTANA. THESE THUNDERSTORMS WERE MOVING TO
THE NORTHEAST AT ABOUT 30 MILES AN HOUR.
OTHER THUNDERSTORMS WERE IN SCATTERED BAND FROM GREAT FALLS SOUTHEAST
INTO MEAGHER AND JEFFERSON COUNTIES. THEY WERE ALSO MOVING TO THE
NORTHEAST AT 30 MILES AN HOUR.
A SEVERE THUNDERSTORM WATCH CONTINUES FOR THE AREA UNTIL 1000 PM MDT THIS
SUNDAY.
<
PERSONS SHOULD BE PREPARED FOR POSSIBLE LARGE HAIL...DAMAGING
WINDS AND DANGEROUS LIGHTNING STRIKES TO GROUND OBJECTS AS THE
THUNDERSTORMS MOVE NORTHEAST ACROSS SOUTHWEST MO{NTANA.
BE PREPARED TO TAKE SHELTER IF ANY OF THESE CONDITIONS ARE OBSERVED.
MHOONThe office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 6:01 PM MDT | Severe Thunderstorm Warning | TFX | Cascade | 56 min |
Nearby
Severe Thunderstorm Warnings in Montana, 1989Every severe thunderstorm warning in 1989
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.