Alert archive / Montana / Severe Thunderstorm Warnings in 1989
Severe Thunderstorm Warning 8, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at Jul 15, 1989, 4:22 PM MDT for Lake County, Missoula County, Montana. It was in force for 2 hr.
The area
The counties it named.
The facts
- Issued
- Jul 15, 1989, 4:22 PM MDT (22:22 UTC)
- Expired
- Jul 15, 1989, 6:30 PM MDT
- In force
- 2 hr
- Issued by
- NWS Missoula, MT
- Area
- Whole counties
Counties Lake County, MT, Missoula 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 12:00Z, 10.4 hours before the alert went out and 184 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
- 3619 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 18 m²/s²
- 0-3 km storm-relative helicity
- 65 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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 15, 2:15 PM MDT, 2 hours 7 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MISSOULA, MT 212 PM MDT SAT JUL 15 1989 ...AT 2 PM MISSOULA WEATHER RADAR INDICATED STRONG THUNDERSTORMS WERE BEGINNING TO DEVELOP IN THE AREA... AT 2 PM MISSOULA WEATHER RADAR WAS INDICATING STRONG THUNDERSTORMS FORMING JUST TO THE WEST OF THE CITIES OF HAMILTON STEVENSVILLE AND MISSOULA. THESE THUNDERSTORM WERE GROWING QUICKLY WITH CLOUD TOPS TO 45,000 FEET. THESE THUNDERSTORMS WERE MOVING EAST AND WILL LIKELY BE OVER THE BITTERROOT VALLEY AND THE MISSOULA AREA WITHIN THE NEXT HOUR. THESE THUNDERSTORMS COULD CAUSE VERY GUSTY WINDS SMALL HAIL AND BRIEF HEAVY RAIN. IF ANY SEVERE WEATHER OCCURS IN YOUR AREA PLEASE REPORT IT TO THE NEAREST LAW ENFORCEFMENT AGENCY OR CALL THE NATIONAL WEATHER SERVICE AT 329-4842. THIS THUNDERSTORM ACTIVITY IS EXPECTED TO CONTINUE IN THE AREA THROUGH TONIGHT. END/JAC
Special weather statement, Jul 15, 2:46 PM MDT, 1 hour 36 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE KALISPELL MT 300 PM MDT SAT JUL 15 1989 ...EXPECT THUNDERSTORMS IN FLATHEAD AND LINCOLN COUNTIES... CLOUDS ARE BUILDING RAPIDLY OVER THE MOUNTAINS OF NORTHWEST MONTANA THIS AFTERNOON. THUNDERSTORM ACTIVITY HAS BEEN REPORTED IN THE SOUTHWEST PORTIONS OF THE STATE ALREADY. THE EXPECTED THUNDERSTORMS THIS AFTERNOON WILL PRODUCE BRIEF LOCALLY HEAVY RAIN...POSSIBLE STRONG GUSTY WINDS AND SMALL HAIL. PERSONS BOATING OR ENGAGED IN OTHER OUTDOOR ACTIVITIES SHOULD MAINTAIN A CLOSE WATCH FOR RAPIDLY CHANGING WEATHER CONDITIONS AND TAKE THE NECESSARY PRECAUTIONS TO AVOID DAGEROUS SITUATIONS. MONITOR LOCAL RADIO NEWS OR NOAA WEATHER RADIO FOR UPDAT+ES ON THIS DEVELOPING WEATHER EVENT. THESE THUNDERSTORMS ARE FORECAST TO CONTINUE THROUGH TONIGHT. ADDITIONAL STATEMENTS WILL BE ISSUED AS NEEDED. ROBERTS
Special weather statement, Jul 15, 3:42 PM MDT, 40 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MISSOULA, MT 342 PM MDT SAT JUL 15 1989 ...SEVERE THUNDERSTORM WATCH IN EFFECT UNTIL 9 PM THIS EVENING FOR WEST CENTRAL MONTANA... A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 9 PM FOR THE FOLLOWING COUNTIES IN WEST CENTAL MONTANA...GRANITE...LAKE...MINERAL...MISSOULA... RAVALLI...AND SANDERS. REMEMBER A WATCH MEANS THAT SEVERE THUNDERSTORMS ARE POSSIBLE. SHOULD THESE THUNDERSTORMS DEVELOP...THEY WOULD MOST LIKELY PRODUCE STRONG POTENTIALLY DAMAGING WINDS...SMALL HAIL AND BRIEF HEAVY RAIN. DURING THE AFTERNOON MISSOULA WEATHER RADAR HAS BEEN SHOWING SOME STRONG THUNDERSTORMS JUST WEST OF THE MONTANA BORDER AND MOVING NORTHEAST. THESEV STORMS HAVE DEVELOPED RAPIDLY AND ARE MOVING ALONG AT ABOUT 30 MPH. ALL PERSONS OUTSIDE AND DRIVING IN THE WATCH AREA NEED TO BE AWARE OF THIS POTENTIALLY DANGEROUS WEATHER AND TAKE APPROPRIATE PRECAUTIONS. BG
Special weather statement, Jul 15, 3:43 PM MDT, 39 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE KALISPELL MT
330 PM MDT SAT JUL 15 1989
...SEVERE THUNDERSTORM WATCH IN EFFECT FOR LARGE PORTIONS OF
WESTERN MONTANA...
THE NATIONAL SEVERE STORMS FORECAST CENTER...IN KASAS CITY...HAS
ISSUED A SEVERE THUNDERSTORM WATCH FOR MOST OF WESTERN MONTANA FROM
330 PM TO 900 PM MDT THIS EVENING. THE WATCH AREA INCLUDES FLATHEAD
COUNTY AND SOUTHERN AND EASTERN PORTIONS OF LINCOLN COUNTY.
A WATCH MEANS THAT CONDITIONS ARE FAVORABLE FOR THE FORMATION OF
SEVERE THUNDERSTOMRS IN AND AROUND THE AREAS INDICATED BY THE WATCH.
A SEVERE THUNDERSTORM IS CAPABLE OF PRODUCING HEAVY RAIN...DANGEROUS
LIGHTNING...DAMAGING HAIL AND STRONG GUSTY WINDS.
PERSONS BOATING OR ENGAGED IN OTHER OUTDOOR ACTIVITIES SHOULD REMAIN
ALERT FOR THE DEVELOPMENT OF THREATENING WEATHER CONDITIONS AND TAKE
THE NECESSARY PRECAUTIONS TO AVOID DAGEROUS SITUATIONS. MONITOR LOCAL
RADIO NEWS OR NOAA WEATHER RADIO FOR UPDbATES OR POSSIBLE WARNINGS ON
THIS DEVELOPING WEATHER EVENT.
THESE THUNDERSTORMS ARE FORECAST TO CONTINUE THROUGH TONIGHT.
ADDITIONAL STATEMENTS WILL BE ISSUED AS CONDITIONS CHANGE.
ROBERTSThe office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 15, 4:29 PM MDT | Severe Thunderstorm Warning | MSO | Ravalli | 2 hr |
| Jul 15, 4:56 PM MDT | Severe Thunderstorm Warning | MSO | Missoula | 2 hr |
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.