Alert archive / Oregon / Flash Flood Warnings in 1997

Flash Flood Warning 18, NWS Pendleton, OR

January 31, 1997Umatilla County, Union County, Wallowa County, Oregon

NWS Pendleton, OR issued this flash flood warning at Jan 31, 1997, 10:35 AM PST for Umatilla County, Union County, Wallowa County, Oregon. It was in force for 6 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, 10:35 AM PST (18:35 UTC)
Expired
Jan 31, 1997, 4:30 PM PST
In force
6 hr
Issued by
NWS Pendleton, OR
Area
Whole counties

Counties Umatilla County, OR, Union County, OR, Wallowa County, OR

The nearest sounding before it

Boise Airport, ID (KBOI), launched 12:00Z, 6.6 hours before the alert went out and 256 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, Boise Airport, ID at 12:00Z on 1997-01-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Boise Airport, ID at 12:00Z on 1997-01-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 509 square meters per square second.1939587897117Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
863 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
509 m²/s²
0-3 km storm-relative helicity
594 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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, 8:03 AM PST, 2 hours 32 minutes earlier.

Area forecast discussion, Jan 31, 8:03 AM PST, 2 hours 32 minutes before
NORTHEAST OREGON/SOUTHEAST WASHINGTON FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
800 AM PST FRI JAN 31 1997

SN IS GONE AT KPDT THIS AM.  FEW CWA LOCATIONS REPORTG MOD RA.  NEW
QPS AMOUNT FOR MEH LOW FOR FIRST PERIOD.  FORECAST AMOUNT OF 0.25
12-18Z AND KMEH ALREADY RECIEVED 0.25 ATTM.  STLT WATER VAPOR
SHOWS BACK EDGE OF FRNT MOVG ONTO N ORE COAST.  KAST OBS ALSO
INDICATE FRNT IS THRU THERE.  FRNT SHOULD BE IN KALW/KPDT AREA NR
00Z.  PCPN SHWRY BHND FRNT TIL TROF PASSAGE SAT EVE.  ZONES LOOK
GOOD WITH ONLY MINOR CHGS.  WILL LWR SN LVLS IN MTNS SAT.  SB

PDT 9633  ALW 9633  PSC 8522  YKM 9522

.PDT...FLOOD WATCH ORE ZONES 17>20.
       FLOOD WATCH WA ZONE 24.
       SEE ALSO PDXFFWPDT FOR SMALL STREAM FLOOD WARNINGS.

.KPDT...VCP21/CSR21 OPERATIONAL.

The office that day

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

IssuedProductOfficeCountiesLasted
Jan 30, 9:35 PM PSTFlash Flood WarningPDTUmatilla, Union, Wallowa8 hr
Jan 31, 9:34 AM PSTFlash Flood WarningPDTUmatilla4 hr
Jan 31, 9:34 AM PSTFlash Flood WarningPDTUnion, Wallowa4 hr
Jan 31, 10:35 AM PSTFlash Flood WarningPDTMorrow6 hr
Jan 31, 3:50 PM PSTFlash Flood WarningPDTUmatilla, Union, Wallowa4 hr
Jan 31, 3:50 PM PSTFlash Flood WarningPDTMorrow4 hr
Jan 30, 9:35 PM PSTFlash Flood WarningPDTWalla Walla8 hr
Jan 31, 10:35 AM PSTFlash Flood WarningPDTColumbia, Walla Walla6 hr
Jan 31, 2:27 PM PSTFlash Flood WarningPDTWalla Walla12 hr

Nearby

Flash Flood Warnings in Oregon, 1997Every 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.