Alert archive / Oregon / Flash Flood Warnings in 1998

Flash Flood Warning 9, NWS Pendleton, OR

July 1, 1998Crook County, Oregon

NWS Pendleton, OR issued this flash flood warning at Jul 1, 1998, 7:13 PM PDT for Crook 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 counties it named.

The facts

Issued: Jul 1, 1998, 7:13 PM PDT (02:13 UTC)
Expired: Jul 1, 1998, 9:15 PM PDT
In force: 2 hr
Issued by: NWS Pendleton, OR
Area: Whole counties

County Crook County, OR

The radar

The Pendleton radar (KPDT), 209 km from the middle of the area, began a volume at 02:16 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

Salem/Mcnary, OR (KSLE), launched 00:00Z, 2.2 hours before the alert went out and 227 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: 809 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: -10 m²/s²
0-3 km storm-relative helicity: -6 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 020215
FFWPDT
ORC013-020415-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PENDLETON OR
713 PM PDT WED JUL 1 1998

THE NATIONAL WEATHER SERVICE IN PENDLETON HAS ISSUED A

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

* UNTIL 915 PM PDT

* AT 710 PM PDT... SPOTTERS INDICATED A THUNDERSTORM WITH VERY HEAVY
  RAIN IN CENTRAL CROOK COUNTY.

* THUNDERSTORMS OVER CROOK COUNTY HAVE PRODUCED VERY HEAVY RAIN.
  SPOTTERS IN PRINEVILLE ESTIMATE RAINFALL RATES APPROACHING ONE
  INCH IN 20 MINUTES.  THIS HAS PRODUCED LOCALIZED FLOODING NEAR
  PRINEVILLE.

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.

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 1, 2:30 PM PDT, 4 hours 43 minutes earlier.

Area forecast discussion, Jul 1, 2:30 PM PDT, 4 hours 43 minutes before

NORTHEAST OREGON/SOUTHEAST WASHINGTON FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
230 PM PDT WED JUL 1 1998

ISOLATED PULSE-TYPE THUNDERSTORMS ARE FIRING ALONG E SLOPES OF WASH
CASCADES AND IN EASTERN ORE. SURFACE DEWPOINT TEMPS ARE AVERAGING
5-10 DEG HIGHER THIS AFTERNOON COMPARED TO 24 HRS EARLIER. 12Z ETA
MODEL IS UNDERESTIMATING AMOUNT OF MOISTURE IN BOUNDARY LAYER SO
CAPES ARE LIKELY TOO LOW. MID LEVEL MOISTURE AND SW FLOW ALOFT WILL
CONTINUE TONIGHT OVER REGION. UPPER TROUGH APPROACHING SE ORE IS
FORECAST TO AMPLIFY TONIGHT AND BECOME NEARLY STATIONARY ON THU
ROUGHLY ALONG THE ORE CASCADES PROVIDING DIFFLUENCE ALOFT OVER E
SIDE. MODELS ALL SHOW INSTABILITY DEVELOPING THU AFTERNOON IN THE
WASH/ ORE CASCADES AND E SIDE. FORECAST PRECIPITABLE WATER OVER
KPDT THU AFTERNOON IS 0.75 INCH. THUS EXPECT SCATTERED
THUNDERSTORMS TO DEVELOP MAINLY OVER MTNS THU AFTERNOON/EVENING.
TROUGH DEEPENS SOMEWHAT FRI WHILE COMBINING WITH CLOSED LOW NOW
SITUATED OVER BRITISH COLUMBIA. FLOW ALOFT BACKS TO S OVER E SIDE
ON FRI WITH BETTER CHANCE OF SHOWERS AND THUNDERSTORMS IN FOOTHILLS
OF THE BLUE MTNS AND IN THE LOWER COLUMBIA BASIN.  POLAN

PDT 3334  ALW 3334  PSC 2223  YKM 2224

.KPDT-88D...VCP21/CSR21.

.KPDT...NONE.

In the hours before

Local storm report, Jul 1, 7:13 PM PDT, 0 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PENDLETON OREGON
713 PM PDT WED JUL 01 1998

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

0709 PM    PRINEVILLE                OR
07/01/98   CROOK                          HEAVY RAIN....5 INCH IN
                                          TEN MINUTES AND STILL
                                          RAINING HARD.  WIND
                                          ESTIMATE AT 40 TO 50
                                          MPH..TREES BENT OVER AND
                                          LOOSING BRANCHES..CROOK 17

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 2, 3:12 PM PDT	Severe Thunderstorm Warning	PDT	Grant	43 min
Jul 2, 3:29 PM PDT	Flash Flood Warning	PDT	Grant	2 hr
Jul 2, 3:53 PM PDT	Severe Thunderstorm Warning	PDT	Grant, Union	62 min
Jul 2, 4:55 PM PDT	Severe Thunderstorm Warning	PDT	Union	35 min

Nearby

Flash Flood Warnings in Oregon, 1998 Every flash flood warning in 1998

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.