Alert archive / Montana / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 6, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at Aug 20, 1990, 6:43 PM MDT for Lincoln County, Montana. It was in force for 62 min.
The area
The counties it named.
The facts
- Issued
- Aug 20, 1990, 6:43 PM MDT (00:43 UTC)
- Expired
- Aug 20, 1990, 7:45 PM MDT
- In force
- 62 min
- Issued by
- NWS Missoula, MT
- Area
- Whole counties
County Lincoln 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
Spokane, WA (KOTX), launched 00:00Z, 0.7 hours before the alert went out and 119 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 3570 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 16 m²/s²
- 0-3 km storm-relative helicity
- 39 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 210042 SVRFCA MTC053-210145- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE KALISPELL MT ISSUED BY GREAT FALLS MT 643 PM MDT MON AUG 20 1990 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 745 PM MDT FOR PEOPLE IN THE FOLLOWING LOCATION...... IN NORTHWEST MONTANA ...NORTHERN LINCOLN COUNTY THE SHERIFF DEPARTMENT IN LIBBY REPORTS A LINE OF SEVERE LOOKING THUNDERSTORMS JUST SOUTH OF LIBBY AT 635 PM MDT. THESE THUNDERSTORMS ARE MOVING NORTH AT 30 MPH. THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH YOU SHOULD PREPARE FOR DAMAGING WIND IN EXCESS OF 55 MPH...LARGE HAIL...AND DEADLY LIGHTNING,. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER... PREFERABLY INSIDE A STRONG BUILDING BUT STAY AWAY FROM WINDOWS.
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, Aug 20, 2:30 PM MDT, 4 hours 13 minutes before
MTZ001-002-200200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MISSOULA MT 230 PM MDT MON AUG 20 1990 ...STRONG THUNDERSTORMS MOVING THROUGH WESTERN MONTANA... AT 220 PM MDT...NUMEROUS THUNDERSTORMS WERE DETECTED ON RADAR IN PORTIONS OF RAVALLI.. MISSOULA.. AND GRANITE COUNTIES. THESE THUNDERSTORMS ARE STILL DEVELOPING AND ARE MOVING TO THE NORTH AT ABOUT 20 MILES AN HOUR. THESE THUNDERSTORMS MAY CONTAIN STRONG GUSTY WINDS..BRIEF HEAVHY RAIN.. FREQUENT LIGHTNING AND SMALL HAIL AND WILL CONTINUE THROUGH THIS AFTERNOON. FURTHER STATEMENTS WILL BE ISSUED IF NECESSARY. END/DWG
Special weather statement, Aug 20, 3:05 PM MDT, 3 hours 38 minutes before
MTZ001-210400- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE KALISPELL MONTANA 305 PM MDT MON AUG 20 1990 ...STRONG THUNDERSTORMS DEVELOPING IN SOUTHWESTERN MONTANA AND CENTRAL IDAHO... AT 300 PM MDT NUMEROUS THUNDERSTORMS WERE BEING PICKED UP BY RADAR OUT OF MISSOULA. THESE THUNDERSTORMS ARE CURRENTLY IN RAVALLI...MISSOULA AND GRANITE COUNTIES. THESE THUNDERSTORMS ARE MOVING TO THE NORTH AT 20 MPH. THE THUNDERSTORMS WILL CONTINUE TO DEVELOPE AND MOVE TOWARDS THE NORTH ACCOMPANIED BY STRONG GUSTY WINDS..BRIEF HEAVY RAIN..FREQUENT LIGHTNING AND A RISK OF SMALL HAIL. THIS ACTIVITY WILL CONTINUE THROUGH EARLY TONIGHT. PERSONS OUTDOORS...PARTICULARLY BOATERS SHOULD SEEK REFUGE WHEN THESE STORMS APPROACH. THE NATIONAL WEATHER SERVICE WILL CONTINUE TO MONITOR THESE STORMS AND ISSUE ADDITIONAL STATEMENTS AS NECESSARY. IF DAMAGING WEATHER OCCURS CONTACT YOUR NATIONAL WEATHER SERVICE OFFICE AT 755-4829. /BILODEAU/ NNNN
Special weather statement, Aug 20, 4:41 PM MDT, 2 hours 2 minutes before
MTZ001-002-210100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MISSOULA MT 430 PM MDT MON AUG 20 1990 ...STRONG THUNDERSTORMS MOVING THROUGH WESTERN MONTANA... AT 420 PM MDT...NUMEROUS THUNDERSTORMS WERE DETECTED ON RADAR IN PORTIONS OF MINERAL...SANDERS...LAKE AND NORTHERN MISSOULA COUNTIES AND ARE MOVING TO THE NORTH AT ABOUT 25 MILES AN HOUR. THESE THUNDERSTORMS MAY CONTAIN STRONG GUSTY WINDS..BRIEF HEAVY RAIN.. FREQUENT LIGHTNING A8ND SMALL HAIL AND WILL CONTINUE THROUGH THIS AFTERNOON. FURTHER STATEMENTS WILL BE ISSUED IF NECESSARY. END/RON
Special weather statement, Aug 20, 5:08 PM MDT, 1 hour 35 minutes before
MTZ001-210400- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE KALISPELL MONTANA 500 PM MDT MON AUG 20 1990 ...STRONG THUNDERSTORMS MOVING INTO SOUTHERN FLATHEAD COUNTY... AT 440 PM MDT STRONG THUNDERSTORMS WERE DETECTED ON MISSOULA RADAR IN NORTHERN PORTIONS OF SANDERS AND LAKE COUNTIES. THESE STORMS WERE MOVING TO THE NORTH AT 25 MPH AND WILL MOVE ACROSS FLATHEAD COUNTY FOR THE NEXT FEW HOURS. THESE THUNDERSTORMS MAY CONTAIN STRONG GUSTY WINDS...BRIEF HEAVY RAIN...FREQUENT LIGHTNING AND SMALL HAIL. PERSONS OUTDOORS...PARTICULARLY BOATERS SHOULD SEEK REFUGE WHEN THESE STORMS APPROACH. THE NATIONAL WEATHER SERVICE WILL CONTINUE TO MONITOR THESE STRONG STORMS AND ISSUE OTHER STATEMRENTS AS NECESSARY. END/TJC
The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 11:10 PM MDT | Severe Thunderstorm Warning | MSO | Lewis and Clark | 35 min |
| Aug 20, 11:20 PM MDT | Severe Thunderstorm Warning | MSO | Lewis and Clark | 25 min |
| Aug 20, 11:52 PM MDT | Flash Flood Warning | MSO | Lewis and Clark | 2 hr |
Nearby
Severe Thunderstorm Warnings in Montana, 1990Every severe thunderstorm warning in 1990
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.