Alert archive / Idaho / Flash Flood Warnings in 1991

Flash Flood Warning 4, NWS Spokane, WA

July 23, 1991Clearwater County, Idaho County, Idaho

NWS Spokane, WA issued this flash flood warning at Jul 23, 1991, 6:50 PM PDT for Clearwater County, Idaho County, Idaho. It was in force for 55 min.

The area

The counties it named.

The facts

Issued
Jul 23, 1991, 6:50 PM PDT (01:50 UTC)
Expired
Jul 23, 1991, 7:45 PM PDT
In force
55 min
Issued by
NWS Spokane, WA
Area
Whole counties

Counties Clearwater County, ID, Idaho County, ID

The nearest sounding before it

Spokane Intl Airport, WA (KGEG), launched 00:00Z, 1.8 hours before the alert went out and 212 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 Intl Airport, WA at 00:00Z on 1991-07-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 471 joules per kilogram.LCLLFCEL10008507005003002001001 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 Intl Airport, WA at 00:00Z on 1991-07-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 15 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
471 J/kg
Mixed-layer CIN
-99 J/kg
Mixed-layer LCL
2339 m above ground
0-6 km bulk shear
5 kt
0-1 km storm-relative helicity
15 m²/s²
0-3 km storm-relative helicity
88 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 KBOI 240153
FFWLWS
IDC035-049-240245-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LEWISTON ID
ISSUED BY BOISE ID
650 PM PDT TUE JUL 23 1991
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  745 PM PDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN NORTH CENTRAL IDAHO
 
   ...CLEARWATER COUNTY...IDAHO COUNTY
 
AT 750 PM MDT...RADAR AND SATELLITE EQUIPMENT INDICATED VERY HEAVY
RAINS FALLING FROM SLOW MOVING THUNDERSTORMS OVER THE MOUNTAINS OF
IDAHO AND CLEARWATER COUNTIES. FLASH FLOODING IS IMMENENT IN THE
CANYONS OF THESE COUNTIES.
 
THE HEAVIEST RAINS WERE FALLING IN THE EASTERN HALF OF THE ABOVE
COUNTIES MOVEMENT WAS TO THE WEST AT 15 MILES AN HOUR.  CAMPERS AND
TRAVELERS IN NARROW CANYONS OF THESE COUNTIES SHOULD HEAD TO HIGH GROU
IMMEDIATELY.
 
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 Idaho, 1991Every flash flood warning in 1991

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.