Alert archive / Montana / Severe Thunderstorm Warnings in 1989
Severe Thunderstorm Warning 4, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at May 10, 1989, 2:26 PM MDT for Missoula County, Montana. It was in force for 64 min. 2 reports 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
- May 10, 1989, 2:26 PM MDT (20:26 UTC)
- Expired
- May 10, 1989, 3:30 PM MDT
- In force
- 64 min
- Issued by
- NWS Missoula, MT
- Area
- Whole counties
County Missoula 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 |
|---|---|---|---|
| May 10, 2:30 PM MDT | Thunderstorm Wind 0 | Missoula, MT | |
| May 10, 3:30 PM MDT | Thunderstorm Wind 0 | Missoula, 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
Spokane, WA (KOTX), launched 12:00Z, 8.4 hours before the alert went out and 201 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
- 3600 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- -19 m²/s²
- 0-3 km storm-relative helicity
- 95 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 KMSO 102026
SVRMSO
MTC063-102130-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MISSOULA MT
226 PM MDT WED MAY 10 1989
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM
WARNING EFFECTIVE UNTIL 330 PM MDT FOR PEOPLE IN THE FOLLOWING
COUNTY
IN THE WEST CENTRAL PART OF MONTANA
SOUTHERN MISSOULA
MISSOULA RADAR IS DETECTING A SEVERE THUNDERSTORM 15 TO 20 MILES
TO THE SOUTH AT 2 20 PM THIS AFTERNOON. THE STORM IS MOVING
TOWARDS THE NORTH OR NORTHEAST AT ABOUT 30 MILES AN HOUR AND
SHOULD MOVE INTO THE LOLO AND MISSOULA VICINITY DURING THE NEXT
HOUR.
IF YOU ARE IN AN AREA THREATENED BY THE STORM..GO TO A REINFORECED
SHELTER AND PREPARE FOR DAMAGING WIND...LARGE HAIL...VERY HEAVY
RAIN AND LIGHTNING.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, May 10, 12:48 PM MDT, 1 hour 38 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MISSOULA, MT 1237 PM MDT WED MAY 10 1989 AT 1230 PM TODAY...MISSOULA WEATHER RADAR WAS DETECTING SOME LARGE THUNDERSTORMS FROM NORTH OF BUTTE TO NEAR HELENA IN SOUTHWEST MONTANA. THESE STORMS WERE MOVING TOWARD THE NE AT ABOUT 40 MILES AN HOURS. A NEW THUNDERSTORM WAS DETECTED IN THE WILDERNESS AREA JUST TO THE WEST OF THE SW TIP OF RAVALLII COUNTY IN IDAHO. THIS STORM WAS MOVING ALONG THE WEST SLOPES OF THE BITTERROOT MOUNTAINS. ADDITIONAL THUNDERSTORMS ARE EXPECTED TO DEVELOP AND THE CHANCE OF STRONG THUNDERSTORM WINDS AND HAIL EXISTS THIS AFTERNOON INTO TONIGHT. ADDITONAL STATEMENTS WILL BE ISSUED AS THUNDERSTORMS DEVELOP. PLEASE REPORT ANY DAMAGING WEATHER TO YOUR NEAREST LAW ENFORCEMENT AGENCY OR THE YOUR NEAREST NATIONAL WEATHER SERVICE OFFICE IF ANY IS DETECTED. END/LGH
Special weather statement, May 10, 1:57 PM MDT, 29 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MISSOULA, MT 142 PM MDT WED MAY 10 1989 ....A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR MOST COUNTIES OF WESTERN HALF OF MONTANA UNTIL 900 PM THIS EVENING.... AT 1 30 THIS AFTERNOON...LARGE THUNDERSTORMS WERE BEING DETECTED IN THE WESTERN EDGE OF RAVALLI COUNTY IN WEST CENTRAL MONTANA.. IN BEAVERHEAD COUNTY OF SOUTHWEST MONTANA..AND IN LEWIS AND CLARK COUNTY BETWEEN HELENA AND GREAT FALLS. THE STORMS WERE MOVING TOWARD THE NORTHEAST AT ABOUT 30 MILES AN HOUR. A WIND GUST TO 75 MILES AN HOUR WAS REPORTED AT BUTTE SHORTLY BEFORE NOON TODAY AS A THUNDERSTORM PASSED. THUNDERSTORMS ARE EXPECTED TO CONTINUE TO DEVELOP AND THERE REMAINS A CHANCE OF STORNG THUNDSTORM WINDS AND HAIL THROUGH THIS EVENING. ADDITONAL STATEMENTS WILL BE RELEASED. PLEASE NOTIFIY YOUR NEAREST LAW ENFORCMENT AGENCY OR YOUR NEAREST NATIONAL WEATHER SERVICE OFFICE IF DAMAGING WEATHER IS DETECTED. END/LGH ~
The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 9, 11:59 PM MDT | Severe Thunderstorm Warning | MSO | Missoula, Ravalli | 61 min |
| May 10, 12:03 PM MDT | Severe Thunderstorm Warning | MSO | Jefferson, Silver Bow | 57 min |
| May 10, 12:49 PM MDT | Severe Thunderstorm Warning | MSO | Jefferson, Lewis and Clark | 116 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.