Alert archive / Idaho / Flash Flood Warnings in 1998

Flash Flood Warning 3, NWS Missoula, MT

July 7, 1998Lemhi County, Idaho

NWS Missoula, MT issued this flash flood warning at Jul 7, 1998, 4:20 PM MDT for Lemhi County, Idaho. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jul 7, 1998, 4:20 PM MDT (22:20 UTC)
Expired
Jul 7, 1998, 6:45 PM MDT
In force
2 hr
Issued by
NWS Missoula, MT
Area
Whole counties

County Lemhi County, ID

The nearest sounding before it

Boise Airport, ID (KBOI), launched 12:00Z, 10.3 hours before the alert went out and 236 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, Boise Airport, ID at 12:00Z on 1998-07-07Temperature 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, Boise Airport, ID at 12:00Z on 1998-07-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -53 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
2470 m above ground
0-6 km bulk shear
6 kt
0-1 km storm-relative helicity
-53 m²/s²
0-3 km storm-relative helicity
-47 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 072224
FFWMSO
IDC059-080045-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MISSOULA MT
420 PM MDT (320 PM PDT) TUE JUL 7 1998

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHERN LEMHI COUNTY IN EAST CENTRAL IDAHO

* UNTIL 645 PM MDT

* AT 415 PM MDT RADAR INDICATED THAT HEAVY RAIN FROM THUNDERSTORMS
  HAD EXCEEDED 2 INCHES DURING THE PAST 3 HOURS AT THE HEADWATERS
  OF EIGHTEEN MILE CREEK...EAST OF GILMORE. THUNDERSTORMS CONTINUE
  OVER THE AREA AND ARE ALMOST STATIONARY.

* FLASH FLOODING IS EXPECTED ON THE CREEK UPSTREAM FROM LEADORE
  DURING THE NEXT SEVERAL HOURS.

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.
GV

Nearby

Flash Flood Warnings in Idaho, 1998Every flash flood warning in 1998

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.