Alert archive / Washington / Flash Flood Warnings in 1998

Flash Flood Warning 9, NWS Spokane, WA

July 31, 1998Stevens County, Washington

NWS Spokane, WA issued this flash flood warning at Jul 31, 1998, 6:43 PM PDT for Stevens County, Washington. It was in force for 92 min. 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 31, 1998, 6:43 PM PDT (01:43 UTC)
Expired
Jul 31, 1998, 8:15 PM PDT
In force
92 min
Issued by
NWS Spokane, WA
Area
Whole counties

County Stevens County, WA

The nearest sounding before it

Spokane, WA (KOTX), launched 00:00Z, 1.7 hours before the alert went out and 133 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 00:00Z on 1998-08-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 204 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, WA at 00:00Z on 1998-08-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 10 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
204 J/kg
Mixed-layer CIN
-25 J/kg
Mixed-layer LCL
963 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
10 m²/s²
0-3 km storm-relative helicity
34 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 KGEG 010146
FFWGEG
WAC065-010315-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SPOKANE WA
643 PM PDT FRI JUL 31 1998

THE NATIONAL WEATHER SERVICE IN SPOKANE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL STEVENS COUNTY IN NORTHEASTERN WASHINGTON

* UNTIL 815 PM PDT

* AT 635 PM PDT... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A THUNDERSTORM WITH VERY HEAVY RAIN 10 MILES SOUTH OF COLVILLE...
  MOVING SLOWLY WEST.

* A SLOW MOVING THUNDERSTORM WILL PRODUCE HEAVY RAIN OVER
  HIGHWAY 395 10 MILES SOUTH OF COLVILLE POSSIBLY INDUNDATING
  THE ROADWAY.

MOVE TO HIGHER GROUND IF FLOOD WATERS THREATEN.

TC

Nearby

Flash Flood Warnings in Washington, 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.