Alert archive / Oregon / Flash Flood Warnings in 1997

Flash Flood Warning 41, NWS Pendleton, OR

July 30, 1997Morrow County, Umatilla County, Oregon

NWS Pendleton, OR issued this flash flood warning at Jul 30, 1997, 8:30 PM PDT for Morrow County, Umatilla County, Oregon. It was in force for 60 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 30, 1997, 8:30 PM PDT (03:30 UTC)
Expired: Jul 30, 1997, 9:30 PM PDT
In force: 60 min
Issued by: NWS Pendleton, OR
Area: Whole counties

Counties Morrow County, OR, Umatilla County, OR

The nearest sounding before it

Salem/Mcnary, OR (KSLE), launched 00:00Z, 3.5 hours before the alert went out and 308 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1768 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 105 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 KPDT 310338 COR
FFWPDT
ORC049-059-310430-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING...CORRECTED WARNING AREA
NATIONAL WEATHER SERVICE PENDLETON OR
830 PM PDT WED JUL 30 1997

THE NATIONAL WEATHER SERVICE IN PENDLETON HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  930 PM PDT
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN NORTHEAST OREGON

   ...SOUTHEASTERN MORROW COUNTY AND NORTHERN UMATILLA COUNTY

AN INTENSE THUNDERSTORM IS PRODUCING HEAVY RAINFALL IN SOUTHEASTERN
MORROW COUNTY. OVER 1/2 INCH OF RAINFALL HAS BEEN MEASURED WITHIN 30
MINUTES ALONG LOWER HINTON CREEK IN HEPPNER.  FLOODING CAN BE EXPECTED
IN NORTH UMATILLA COUNTY AS THIS THUNDERSTORM MOVES ACROSS BY 845 PM.

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.

SMITH

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Pendleton, OR wrote its last area forecast discussion before this flash flood warning went out at Jul 30, 8:30 PM PDT, 0 minutes earlier.

Area forecast discussion, Jul 30, 8:30 PM PDT, 0 minutes before

NORTHEAST OREGON/SOUTHEAST WASHINGTON FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
830 PM PDT WED JUL 30 1997

HAS BEEN AN EXCITING NGT WITH PLENTY OF WRNG ISSUED. CNVCNTN CONTG
THRU THE EVNG FROM CENT ORE INTO THE FOOTHILLS OF THE BLUE AND
SPRDG INTO SE WASH AND SRN FLANK OF HORSE HEAVENS. COVERAGE MAY BE
DECRSG BUT SOME STG CELLS ARE MOVG THRU LOWER COL BASIN AND
FOOTHILLS. SPOTTER CONFIRMED PLENTY OF HAILS WITH SOME REACHING SVR
LIMITS. XPCT SHWRS TO CONT LATE INTO THE NGT AND WL MENTION CHC OF
TS AS WELL. DONT SEE MAJ CHGS TO E SIDE WITH H5 TROF REMAINING
OFSHR AND SW FLO CONTG THRU FCST PERIOD. MDLS INDICATE SOME LO LVL
CAA BUT BULK OF CAA GOES N OF CWA. WILL MENTION CHC OF TS THRU FCST
PERIOD.
FB

PDT 7342  ALW 7342  PSC 6232  YKM 6232

.KPDT...VCP11/CSR21...OPERATIONAL.

.KPDT...NONE.

The office that day

Everything else NWS Pendleton, OR issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 30, 5:06 PM PDT	Severe Thunderstorm Warning	PDT	Umatilla	69 min
Jul 30, 5:29 PM PDT	Severe Thunderstorm Warning	PDT	Wasco	2 hr
Jul 30, 6:05 PM PDT	Severe Thunderstorm Warning	PDT	Umatilla	55 min
Jul 30, 6:41 PM PDT	Severe Thunderstorm Warning	PDT	Morrow, Umatilla	64 min
Jul 30, 7:22 PM PDT	Severe Thunderstorm Warning	PDT	Wasco	68 min
Jul 30, 7:49 PM PDT	Severe Thunderstorm Warning	PDT	Morrow, Umatilla	56 min
Jul 30, 9:24 PM PDT	Flash Flood Warning	PDT	Morrow, Umatilla	96 min
Jul 31, 2:50 PM PDT	Severe Thunderstorm Warning	PDT	Crook, Deschutes	40 min
Jul 31, 3:15 PM PDT	Severe Thunderstorm Warning	PDT	Umatilla, Union	45 min
Jul 31, 3:30 PM PDT	Severe Thunderstorm Warning	PDT	Crook, Jefferson	60 min
Jul 31, 4:00 PM PDT	Severe Thunderstorm Warning	PDT	Umatilla, Union	60 min

Nearby

Flash Flood Warnings in Oregon, 1997 Every flash flood warning in 1997

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.