Alert archive / Washington / Flash Flood Warnings in 1990

Flash Flood Warning 1, NWS Seattle, WA

August 21, 1990Kittitas County, Washington

NWS Seattle, WA issued this flash flood warning at Aug 21, 1990, 1:36 PM PDT for Kittitas County, Washington. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued
Aug 21, 1990, 1:36 PM PDT (20:36 UTC)
Expired
Aug 21, 1990, 3:45 PM PDT
In force
2 hr
Issued by
NWS Seattle, WA
Area
Whole counties

County Kittitas County, WA

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 Intl Airport, WA (KGEG), launched 12:00Z, 8.6 hours before the alert went out and 246 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 12:00Z on 1990-08-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 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 12:00Z on 1990-08-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 0 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
1 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
881 m above ground
0-6 km bulk shear
0 kt
0-1 km storm-relative helicity
0 m²/s²
0-3 km storm-relative helicity
0 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 KSEA 212035
FFWSEA
WAC037-212245-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SEATTLE WA
136 PM PDT TUE AUG 21 1990
 
THE NATIONAL WEATHER SERVICE IN SEATTLE HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  345 PM PDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN CENTRAL WASHINGTON
 
   ...KITTITAS COUNTY
 
HEAVY SHOWERS CONTINUE IN THE COUNTY THIS AFTERNOON. FLOODING HAS BEEN
REPORTED IN THE TOWN OF KITTITAS AND ELSEWHERE IN THE COUNTY.,
 
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 CROSS A FLOWING STREAM...EVEN A SMALL
ONE...ON FOOT.  TO ESCAPE RISING WATER MOVE UP TO HIGHER GROUND.

Nearby

Flash Flood Warnings in Washington, 1990Every flash flood warning in 1990

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.