Alert archive / Oregon / Flash Flood Warnings in 1997

Flash Flood Warning 25, NWS Pendleton, OR

January 31, 1997Morrow County, Oregon

NWS Pendleton, OR issued this flash flood warning at Jan 31, 1997, 8:00 PM PST for Morrow County, Oregon. It was in force for 7 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: Jan 31, 1997, 8:00 PM PST (04:00 UTC)
Expired: Feb 1, 1997, 2:30 AM PST
In force: 7 hr
Issued by: NWS Pendleton, OR
Area: Whole counties

County Morrow County, OR

The nearest sounding before it

Boise Airport, ID (KBOI), launched 00:00Z, 4.0 hours before the alert went out and 338 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: 755 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 169 m²/s²
0-3 km storm-relative helicity: 168 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 010401
FFWPDT
ORC049-059-061-063-WAC013-011000-
 
BULLETIN
SMALL STREAM FLOOD WARNING
NATIONAL WEATHER SERVICE PENDLETON OR
800 PM PST FRI JAN 31 1997
 
THE NATIONAL WEATHER SERVICE IN PENDLETON HAS ISSUED A
SMALL STREAM FLOOD WARNING EFFECTIVE UNTIL 230 AM PST
SATURDAY FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN NORTHEAST OREGON
 
   ...SOUTHERN MORROW COUNTY...UMATILLA COUNTY...UNION COUNTY
   ...WALLOWA COUNTY
 
 
IN SOUTHEAST WASHINGTON
 
   ...COLUMBIA COUNTY
 
AT 750 PM...DOPPLER RADAR IN PENDLETON SHOWED A LARGE AREA OF RAINFALL
MOVING INTO THE BLUE MOUNTAINS. THE AREA OF RAIN EXTENDED FROM NORTHERN
WALLA WALLA COUNTY OF WASHINGTON...SOUTHWEST TO THE VICINITY OF HEPPNER
OREGON. POCKETS OF MODERATE TO HEAVY RAINFALL WAS ALSO EMBEDDED IN THIS
AREA. THE ADDITIONAL RAIN TONIGHT WILL CAUSE MORE FLOODING TONIGHT IN
SOUTHEAST WASHINGTON AND NORTHEAST OREGON.
 
DO NOT ATTEMPT TO CROSS BRIDGES...DIPS...OR LOW SPOTS IF WATER COVERS THROADWRAY.
 
BIRCH

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 Jan 31, 8:00 PM PST, 0 minutes earlier.

Area forecast discussion, Jan 31, 8:00 PM PST, 0 minutes before

NORTHEAST OREGON/SOUTHEAST WASHINGTON FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
800 PM PST FRI JAN 31 1997

IR LOOP SHOWS ENHANCED CLDS MOVG EWRD E OF CASCDS ASOCD WITH VORT
MAX.  KPDT 88D ATTM SHOWS -SHRA MOVG ACRS YAKIMA VLLY...LOWER COL
BASIN AND SHRA MOVG THRU FTHLS AND BLUE MTNS.  MDT TO HVY RAIN
ALG FTHLS AND MTNS OF BLUES SO HAVE EXTENDED SMALL STREAM FLOOD
WARNING UNTIL 230 AM IN NE ORE AND SE WA.

AS VORT MAX EXITS WA/ORE LTR TNGT SHWRS WILL TAPER OFF IN COL BASIN
BUT WL CONT IN FTHLS AND BLUE MTNS THRU TNGT WITH SNOW LEVEL
DECREASG TO 4000 FEET LATE TNGT.

ZONAL FLOW IN CNTRL/WRN PAC STRENGTHENS SAT CAUSING DNSTRM RDG TO
BLD NR 140W ON SAT. AMPPLIFYING RDG STEERS VORT MAX NR 42N/136W
SEWRD INTO CNTRL CA SAT.  SMALL PIECE OF ENERGY MOVS ACRS SRN ORE
SAT.  SWLY FLOW ALF OVR PAC NW BCMS MORE ZONAL SAT SO XPCT MOST OF
PCPN WL BE ON WSIDE OF CASCDS AS SHWERS WITH DNSLP DRYING OUT ALG
E SLOPES OF CASCDS ALTHOUGH SCT -SHRA TO CONT IN BLUES SAT CHGG
TO -SHSN AS SNOW LEVEL LOWERS TO 3000 FT SAT AFTN WITH -SHSN ENDING
SAT EVNG.  S/WV DROPS SEWD IN NWLY FLOW SUN FOR UPSLP SHSN IN
BLUES.  POLAN

PDT 8332  ALW 8332  PSC 6211  YKM 4211

.PDT...FLOOD WATCH ORE ZONES 17>20.
       FLOOD WATCH WA ZONE 27-29-30.
       SEE ALSO PDXFFSPDT FOR SMALL STREAM FLOOD WARNINGS AND WSFOS
       FLS FOR MAIN STEM FLOOD WARNINGS.

.KPDT...VCP21/CSR21 OPERATIONAL.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 31, 8:00 PM PST	Flash Flood Warning	PDT	Umatilla, Union, Wallowa	7 hr

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.