Alert archive / Oregon / Flash Flood Warnings in 2002

Flash Flood Warning 6, NWS Pendleton, OR

August 25, 2002Deschutes County, Oregon

NWS Pendleton, OR issued this flash flood warning at Aug 25, 2002, 5:56 PM PDT for Deschutes County, Oregon. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 25, 2002, 5:56 PM PDT (00:56 UTC)
Expired
Aug 25, 2002, 8:00 PM PDT
In force
2 hr
Issued by
NWS Pendleton, OR
Area
Counties, with a storm outline in the text

County Deschutes County, OR

The radar

The Portland,OR radar (KRTX), 222 km from the middle of the area, began a volume at 00:59 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this flash flood warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Salem/Mcnary, OR (KSLE), launched 00:00Z, 0.9 hours before the alert went out and 163 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, Salem/Mcnary, OR at 00:00Z on 2002-08-26Temperature 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, Salem/Mcnary, OR at 00:00Z on 2002-08-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1225 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
-1 m²/s²
0-3 km storm-relative helicity
50 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 
WGUS51 KPDT 260056
FFWPDT
ORC017-260300-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PENDLETON OR
554 PM PDT SUN AUG 25 2002

THE NATIONAL WEATHER SERVICE IN PENDLETON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL DESCHUTES COUNTY IN CENTRAL OREGON

* UNTIL 800 PM PDT

* AT 554 PM PDT...LOCAL LAW ENFORCMENT AND SPOTTER REPORTS INDICATED 
  FLASH FLOODING IN BEND. AT HIGHWAY UNDERPASSES WATER IS ALREADY UP 
  TO THE HOODS OF CARS. 

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS AND STREAMS AND OTHER
LOW LYING AREAS ARE SUBJECT TO FLASH FLOODING.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY.
MOVE TO HIGHER GROUND.

LAT...LON 4414 12140 4401 12123 4408 12108 4422 12128

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 Aug 25, 1:25 PM PDT, 4 hours 31 minutes earlier.

Area forecast discussion, Aug 25, 1:25 PM PDT, 4 hours 31 minutes before
NORTHEAST OREGON/SOUTHEAST WASHINGTON FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
125 PM PDT SUN AUG 25 2002

SHORT TERM AND FIRE WEATHER...AN UPPER LEVEL SHORT WAVE WILL MOVE
ACROSS THE FORECAST AREA THIS AFTERNOON AND TONIGHT. DYNAMIC LIFT
AND INSTABILITY ASSOCIATED WITH THE WAVE WILL TRIGGER SCATTERED
SHOWERS AND THUNDERSTORMS AS THIS SYSTEM MOVES THROUGH. THE
THUNDERSTORMS THIS AFTERNOON AND TONIGHT WILL BE MOSTLY WET AS THE
AIR MASS OVER THE AREA IS RATHER MOIST. A WEAK MARINE PUSH WILL
BEGIN LATE THIS AFTERNOON ALONG THE EAST SLOPES OF THE CASCADES AND
THEN MOVE ACROSS THE REMAINDER OF THE FORECAST AREA THIS EVENING.
THIS WILL INCREASE WINDS TONIGHT AND USHER IN A MUCH MORE STABLE AIR
MASS FOR MONDAY. THE SHORT WAVE WILL MOVE INTO IDAHO AND MONTANA ON
MONDAY WITH NORTHERLY FLOW ALOFT ON THE BACK SIDE OF THE UPPER
TROUGH OVER THE FORECAST AREA. ON MONDAY MARGINAL INSTABILITY WILL
REMAIN OVER EXTREME NORTHEAST OREGON FOR POSSIBLE ISOLATED
THUNDERSTORMS...MAINLY OVER WALLOWA COUNTY. THE UPPER SHORT WAVE
WILL STALL OVER MONTANA ON MONDAY BEFORE DIGGING SOUTHWEST INTO
IDAHO AND SOUTHEAST OREGON ON TUESDAY. THIS WILL ALLOW SOME WRAP
AROUND MOISTURE TO RETURN TO EXTREME EASTERN OREGON FOR SOME SHOWERS
AND MOSTLY WET ISOLATED THUNDERSTORMS ON TUESDAY. THE AFOREMENTIONED
SHORT WAVE WILL MOVE INTO EASTERN OREGON ON WEDNESDAY FOR A CHANCE
OF MAINLY AFTERNOON AND EVENING SHOWERS AND MOSTLY WET THUNDERSTORMS
OVER THE MOUNTAINS OF NORTHEAST OREGON.  POLAN

IN THE EXTENDED...STUBBORN SHORT WAVE/MID LEVEL LOW PRESSURE OVER
EASTERN OREGON WILL BEGIN TO WEAKEN AND DRIFT INTO IDAHO THURSDAY.
BUT LINGERING MOISTURE REMAINS MAINLY OVER THE EASTERN FORECAST AREA
THAT INCLUDES THE BLUE AND WALLOWA MOUNTAINS...WHICH WILL SEE SOME
AFTERNOON AND EVENING THUNDERSTORMS. ALSO WITH THE EXITING LOW COMES
A LONG WAVE TROUGH ENTERING THE PACIFIC NORTHWEST COAST THURSDAY
AFTERNOON AND SOME ISOLATED THUNDERSTORMS MAY DEVELOP OVER THE
NORTHERN CASCADES NEAR GOLDENDALE LATE THURSDAY AND INTO THE
EVENING. DRIER AIR FILTERS INTO THE CASCADES FRIDAY BUT INSTABILITY
PERSISTS OVER THE WALLOWA AND BLUE MOUNTAINS WHERE ISOLATED
THUNDERSTORMS ARE POSSIBLE. AS THE TROUGH MOVES EAST AND AWAY FROM
THE THE AREA SATURDAY...MUCH DRIER AIR WILL INVADE ALL OF NORTHEAST
OREGON AND SOUTHEAST WASHINGTON AND A RETURN TO MOSTLY SUNNY AND
WARMER TEMPERATURES ARE LIKELY NEXT WEEKEND.

PDT 3000  ALW 3000  PSC 2000  YKM 2000

KPDT...VCP21/PRECIP MODE...OPERATIONAL.

.KPDT...NONE.

In the hours before

Local storm report, Aug 25, 4:25 PM PDT, 1 hour 31 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PENDLETON OREGON
425 PM PDT SUN AUG 25 2002

TIME(PDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0423 PM    8 W CULVER                OR   .75 INCH HAIL
08/25/02   JEFFERSON                      7.5 MILES WEST OF
                                          CULVER AT 4:25 P.M.
                                          REPORTED BY STORM
                                          SPOTTER JE-9.

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 25, 5:03 PM PDTSevere Thunderstorm WarningPDTUnion42 min
Aug 25, 5:31 PM PDTSevere Thunderstorm WarningPDTDeschutes44 min
Aug 25, 5:31 PM PDTSevere Thunderstorm WarningPDTDeschutes44 min

Nearby

Flash Flood Warnings in Oregon, 2002Every flash flood warning in 2002

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.