Alert archive / Montana / Severe Thunderstorm Warnings in 1989

Severe Thunderstorm Warning 9, NWS Missoula, MT

July 15, 1989Ravalli County, Montana

NWS Missoula, MT issued this severe thunderstorm warning at Jul 15, 1989, 4:29 PM MDT for Ravalli County, Montana. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued
Jul 15, 1989, 4:29 PM MDT (22:29 UTC)
Expired
Jul 15, 1989, 6:30 PM MDT
In force
2 hr
Issued by
NWS Missoula, MT
Area
Whole counties

County Ravalli 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, 10.5 hours before the alert went out and 250 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.

Skew-T log-pSkew-T log-p diagram, Spokane, WA at 12:00Z on 1989-07-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Spokane, WA at 12:00Z on 1989-07-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 18 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
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

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KMSO 152232
SVRMSO
BULLETIN-EBS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MISSOULA, MT
429 PM MDT SAT JUL 15 1989
MTC047-081-160030-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MISSOULA MT
430 PM MDT SAT JUL 15 1989

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM
WARNING EFFECTIVE UNTIL 630 PM MDT FOR PEOPLE IN THE FOLLOWING
COUNTIES

   IN THE WEST CENTRAL PART OF MONTANA
      RAVALLI

STRONG GUSTY WINDS HAVE DOWNED POWER LINES WEST OF HAMILTON VICTOR
AND STEVENSVILLE.  WEATHER RADAR INDICATED STRONG THUNDERSTORMS IN
THE AREA.  THE STORMS ARE MOVING TO THE NORTHEAST AT 25 MILES AN HOUR.

 THESE THUNDERSTORMS CONTAIN STORNG GUSTY WINDS AND CAN PRODUCE
 LARGE DAMAGING HAIL.  PERIODS OF HEAVY RAIN CAN ALSO BE EXPECTED.
 PERSONS IN THE VICINITY OF THESE STORMS SHOULD TAKE COVER
 IMMEDIATELY.

STUYVESANT

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 14 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 43 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, 47 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, 46 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.

ROBERTS

The office that day

Everything else NWS Missoula, MT issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 15, 4:22 PM MDTSevere Thunderstorm WarningMSOLake, Missoula2 hr
Jul 15, 4:56 PM MDTSevere Thunderstorm WarningMSOMissoula2 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.