Alert archive / Oregon / Flash Flood Warnings in 1997

Flash Flood Warning 31, NWS Pendleton, OR

May 31, 1997Umatilla County, Oregon

NWS Pendleton, OR issued this flash flood warning at May 31, 1997, 3:05 AM PDT for Umatilla County, Oregon. It was in force for 85 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
May 31, 1997, 3:05 AM PDT (10:05 UTC)
Expired
May 31, 1997, 4:30 AM PDT
In force
85 min
Issued by
NWS Pendleton, OR
Area
Whole counties

County Umatilla County, OR

The radar

The Pendleton radar (KPDT), 14 km from the middle of the area, began a volume at 10:09 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Spokane, WA (KOTX), launched 00:00Z, 10.1 hours before the alert went out and 295 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 1997-05-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 63 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 1997-05-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 77 square meters per square second.1939587897Sfc1 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
63 J/kg
Mixed-layer CIN
-12 J/kg
Mixed-layer LCL
919 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
77 m²/s²
0-3 km storm-relative helicity
208 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KPDT 311014 COR
FFWPDT
ORC059-311130-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM AND FLASH FLOOD WARNING...CORR FOR EXPIRE TIME
NATIONAL WEATHER SERVICE PENDLETON OR
305 AM PDT SAT MAY 31 1997

THE NATIONAL WEATHER SERVICE IN PENDLETON HAS ISSUED A
SEVERE THUNDERSTORM AND FLASH FLOOD WARNING
EFFECTIVE UNTIL  430 AM PDT
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN NORTHEAST OREGON

   ...NORTHWESTERN UMATILLA COUNTY

AT 300 AM...A SEVERE THUNDERSTORM IN CENTRAL MORROW COUNTY CONTINUED
MOVING NORTHEAST AT 30 TO 35 MPH. THIS STORM WILL MOVE INTO NORTHWEST
UMATILLA COUNTY AROUND 320 AM. THIS STORM PRODUCED ONE INCH DIAMETER
HAIL...HIGH WINDS...HEAVY RAIN AND LIGHTNING WHEN IT MOVED THROUGH IONE
AT 245 AM. THE PATH OF THIS STORM WILL TAKE IT THROUGH THE
HERMISTON...STANFIELD AND ECHO AREAS BETWEEN 330 AND 400 AM. FLASH
FLOODING AND URBAN FLOODING IS LIKELY.

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL.$..DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS.  HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

SOLOMON

&

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 May 31, 2:00 AM PDT, 1 hour 5 minutes earlier.

Area forecast discussion, May 31, 2:00 AM PDT, 1 hour 5 minutes before
NORTHEAST OREGON/SOUTHEAST WASHINGTON FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OREGON
200 AM PDT SAT MAY 31 1997

A FEW SEVERE TS CONTINUE ATTM.  DUE TO PRIORITY...THIS PRODUCT IS
DELAYED WITH ESTIMATED TIME OF NEXT ISSUANCE AT 830 AM.  SB

PDT 6311  ALW 6311  PSC 6211  YKM 6211

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

The office that day

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

IssuedProductOfficeCountiesLasted
May 30, 10:20 PM PDTSevere Thunderstorm WarningPDTUnion40 min
May 31, 12:27 AM PDTSevere Thunderstorm WarningPDTCrook, Deschutes, Jefferson63 min
May 31, 12:55 AM PDTSevere Thunderstorm WarningPDTWasco65 min
May 31, 1:35 AM PDTSevere Thunderstorm WarningPDTGilliam, Sherman55 min
May 31, 2:26 AM PDTFlash Flood WarningPDTMorrow64 min
May 31, 2:26 AM PDTSevere Thunderstorm WarningPDTMorrow64 min
May 31, 3:05 AM PDTSevere Thunderstorm WarningPDTUmatilla85 min
May 31, 8:41 AM PDTFlash Flood WarningPDTCrook, Jefferson2 hr
May 31, 9:10 AM PDTSevere Thunderstorm WarningPDTGilliam, Sherman, Wasco65 min
May 31, 9:10 AM PDTSevere Thunderstorm WarningPDTJefferson65 min
May 31, 9:25 AM PDTSevere Thunderstorm WarningPDTGilliam, Morrow65 min
May 31, 9:25 AM PDTSevere Thunderstorm WarningPDTSherman65 min
May 31, 9:39 AM PDTSevere Thunderstorm WarningPDTCrook, Deschutes, Jefferson66 min
May 31, 10:28 AM PDTSevere Thunderstorm WarningPDTMorrow, Umatilla62 min
May 31, 10:55 AM PDTSevere Thunderstorm WarningPDTCrook65 min
May 31, 10:58 AM PDTSevere Thunderstorm WarningPDTMorrow62 min
May 31, 11:25 AM PDTSevere Thunderstorm WarningPDTMorrow, Umatilla65 min
May 31, 11:45 AM PDTFlash Flood WarningPDTMorrow2 hr
May 31, 12:25 PM PDTSevere Thunderstorm WarningPDTUmatilla50 min
May 31, 1:05 PM PDTSevere Thunderstorm WarningPDTUnion55 min
May 31, 1:06 PM PDTSevere Thunderstorm WarningPDTUnion54 min
May 31, 1:10 PM PDTSevere Thunderstorm WarningPDTUnion50 min
May 31, 1:15 PM PDTSevere Thunderstorm WarningPDTUmatilla60 min
May 31, 1:25 PM PDTFlash Flood WarningPDTUmatilla2 hr
May 31, 2:29 PM PDTSevere Thunderstorm WarningPDTWallowa61 min

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; radar from the NEXRAD Level II archive.