Alert archive / Montana / Flash Flood Warnings in 1987

Flash Flood Warning 1, NWS Missoula, MT

July 2, 1987Meagher County, Montana

NWS Missoula, MT issued this flash flood warning at Jul 2, 1987, 7:19 PM MDT for Meagher County, Montana. It was in force for 116 min.

The area

The counties it named.

The facts

Issued
Jul 2, 1987, 7:19 PM MDT (01:19 UTC)
Expired
Jul 2, 1987, 9:15 PM MDT
In force
116 min
Issued by
NWS Missoula, MT
Area
Whole counties

County Meagher 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, 1.3 hours before the alert went out and 98 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, Great_falls, MT at 00:00Z on 1987-07-03Temperature 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, Great_falls, MT at 00:00Z on 1987-07-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 32 square meters per square second.1939Sfc1 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
3598 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
32 m²/s²
0-3 km storm-relative helicity
16 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 KHLN 030119
FFWHLN
MTC059-030315-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HELENA MONTANA
719 PM MDT THU JUL 2 1987
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING
EFFECTIVE UNTIL  915 PM MDT FOR PEOPLE IN THE FOLLOWING COUNTY...
 
IN SOUTHWEST MONTANA
          ...MEAGHER
 
A LINE OF VERY SLOW MOVING THUNDERSORMS HAS DUMPED UP TO TWO INCHES
OF RAIN IN THE WHITE SULFUR SPRINGS AREA. RADAR INDICATES THAT MORE
THUNDERSTORMS WILL CONTINUE TO AFFECT THIS AREA AND HENCE SMALL
STREAMS AND LOW LYING AREAS MAY CONTINUE TO BECOME FLOODED.
 
A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS
IMMINENT.  MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES.  DO NOT
ATTEMPT TO CROSS BRIDGES...DIPS...OR LOW SPOTS IF WATER COVERS
THE ROADWAY.  NEVER TRY TO CROSS A FLOWING STREAM...EVEN A SMALL
ONE...ON FOOT.  TO ESCAPE RISING WATER MOVE UP TO HIGHER GROUND.

Nearby

Flash Flood Warnings in Montana, 1987Every flash flood warning in 1987

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.