Alert archive / Oregon / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 19, NWS Pendleton, OR

July 8, 2002Wallowa County, Oregon

NWS Pendleton, OR issued this severe thunderstorm warning at Jul 8, 2002, 1:52 AM PDT for Wallowa County, Oregon. It was in force for 23 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 8, 2002, 1:52 AM PDT (08:52 UTC)
Expired: Jul 8, 2002, 2:15 AM PDT
In force: 23 min
Issued by: NWS Pendleton, OR
Area: Counties, with a storm outline in the text

County Wallowa County, OR

The radar

The Pendleton radar (KPDT), 132 km from the middle of the area, began a volume at 08:56 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 severe thunderstorm 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

Spokane, WA (KOTX), launched 00:00Z, 8.9 hours before the alert went out and 233 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: 221 J/kg
Mixed-layer CIN: -242 J/kg
Mixed-layer LCL: 2320 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 75 m²/s²
0-3 km storm-relative helicity: 150 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

366 
WUUS56 KPDT 080852
SVRPDT
ORC063-080915-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PENDLETON OR
152 AM PDT MON JUL 8 2002

THE NATIONAL WEATHER SERVICE IN PENDLETON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL WALLOWA COUNTY IN NORTHEAST OREGON

* UNTIL 215 AM PDT

* AT 152 AM PDT...THE PUBLIC REPORTED A SEVERE THUNDERSTORM OVER
  CENTRAL WALLOWA COUNTY...OR ABOUT 4 MILES NORTHEAST OF
  ENTERPRISE...MOVING NORTH AT 55 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  RURAL NORTHERN WALLOWA COUNTY AT 210 AM PDT

LAT...LON 4548 11734 4544 11709 4598 11686 4599 11715

&

What forecasters said that day

The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Jul 7, 8:30 PM PDT, 5 hours 22 minutes earlier.

Area forecast discussion, Jul 7, 8:30 PM PDT, 5 hours 22 minutes before

NORTHEAST OREGON/SOUTHEAST WASHINGTON FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
830 PM PDT SUN JUL 7 2002

A LOW PRESSURE SYSTEM IS CROSSING OVER THE CASCADES.  THE SYSTEM IS
LIFTING THE WARM MOIST LOW LEVEL AIR EAST OF THE CASCADES RESULTING
IN SCATTERED THUNDERSTORMS.  SEVERAL THUNDERSTORMS HAVE BEEN SEVERE
WITH WITH .75 INCH HAIL AND WIND GUSTS IN EXCESS OF 50 MPH.  THE
STRONGEST WIND GUST REPORTED SO FAR IS 76 MPH AT THE PASCO AIRPORT.
THESE WINDS HAVE REDUCED VISIBILITIES BRIEFLY TO AS LOW AS ONE
QUARTER MILE IN THE COLUMBIA BASIN AND ALONG THE FOOTHILLS OF THE
BLUES.

THE FIRST BAND OF THUNDERSTORMS HAS MOVED INTO THE NORTHERN PORTION
OF THE COLUMBIA BASIN.  HOWEVER...A SECOND BAND OVER CENTRAL OREGON
IS SHOWING SIGNS OF INCREASING IN INTENSITY AS IT MOVES NORTH THIS
EVENING.

PDT 3200  ALW 3200  PSC 3000  YKM 3000

KPDT...VCP21/CSR21...OPERATIONAL.

.KPDT...NONE

In the hours before

Local storm report, Jul 7, 11:42 PM PDT, 2 hours 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PENDLETON OREGON
1142 PM PDT SUN JUL 07 2002

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

0510 PM    ALFALFA                   OR   .75 INCH HAIL
07/07/02   DESCHUTES                      REPORTED BY STORM
                                          SPOTTER.

0525 PM    POWELL BUTTE              OR   .75 INCH HAIL
07/07/02   CROOK                          REPORTED BY STORM
                                          SPOTTER.

0540 PM    PRINEVILLE                OR   LIGHTNING
07/07/02   CROOK                          REPORTED BY STORM
                                          SPOTTER.POWER AND PHONE                                           SERVICE LOST DUE TO                                           LIGHTNING AND WIND GUSTS                                           TO 40 MPH.

Local storm report, Jul 7, 11:42 PM PDT, 2 hours 10 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE PENDLETON OREGON
1142 PM PDT SUN JUL 07 2002

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

0510 PM    ALFALFA                   OR   .75 INCH HAIL
07/07/02   DESCHUTES                      REPORTED BY STORM
                                          SPOTTER.

0525 PM    POWELL BUTTE              OR   .75 INCH HAIL
07/07/02   CROOK                          REPORTED BY STORM
                                          SPOTTER.

0540 PM    PRINEVILLE                OR   LIGHTNING
07/07/02   CROOK                          REPORTED BY STORM
                                          SPOTTER.  POWER AND PHONE
                                          SERVICE LOST DUE TO
                                          LIGHTNING AND WIND GUSTS
                                          TO 40 MPH.

Local storm report, Jul 8, 1:49 AM PDT, 3 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PENDLETON OREGON
149 AM PDT MON JUL 08 2002

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

0145 AM    ENTERPRISE                OR   .75 INCH HAIL
07/08/02   WALLOWA                        REPORTED BY STORM
                                          SPOTTER.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 7, 5:04 PM PDT	Severe Thunderstorm Warning	PDT	Union	56 min
Jul 7, 5:27 PM PDT	Severe Thunderstorm Warning	PDT	Crook, Jefferson	33 min
Jul 7, 6:02 PM PDT	Severe Thunderstorm Warning	PDT	Umatilla, Union	43 min
Jul 7, 6:03 PM PDT	Severe Thunderstorm Warning	PDT	Jefferson, Wasco	27 min
Jul 7, 6:28 PM PDT	Severe Thunderstorm Warning	PDT	Gilliam, Sherman	47 min
Jul 7, 6:31 PM PDT	Severe Thunderstorm Warning	PDT	Umatilla, Union	44 min
Jul 7, 8:52 PM PDT	Severe Thunderstorm Warning	PDT	Morrow	28 min
Jul 7, 10:08 PM PDT	Severe Thunderstorm Warning	PDT	Union	52 min
Jul 7, 10:44 PM PDT	Severe Thunderstorm Warning	PDT	Union	46 min
Jul 7, 11:21 PM PDT	Severe Thunderstorm Warning	PDT	Wallowa	69 min
Jul 8, 2:16 AM PDT	Severe Thunderstorm Warning	PDT	Wallowa	44 min

Nearby

Severe Thunderstorm Warnings in Oregon, 2002 Every severe thunderstorm 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.