Alert archive / Oregon / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 2, NWS Pendleton, OR

June 26, 2002Union County, Wallowa County, Oregon

NWS Pendleton, OR issued this severe thunderstorm warning at Jun 26, 2002, 6:20 PM PDT for Union County, Wallowa County, Oregon. It was in force for 25 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: Jun 26, 2002, 6:20 PM PDT (01:20 UTC)
Expired: Jun 26, 2002, 6:45 PM PDT
In force: 25 min
Issued by: NWS Pendleton, OR
Area: Whole counties

Counties Union County, OR, Wallowa County, OR

The radar

The Pendleton radar (KPDT), 102 km from the middle of the area, began a volume at 01:21 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

Boise Airport, ID (KBOI), launched 00:00Z, 1.3 hours before the alert went out and 236 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: 1140 J/kg
Mixed-layer CIN: -110 J/kg
Mixed-layer LCL: 3679 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 63 m²/s²
0-3 km storm-relative helicity: 89 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

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

000 
WUUS56 KPDT 270132
SVRPDT
ORZ050-270145-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING...CORRECTED
NATIONAL WEATHER SERVICE PENDLETON OR
618 PM PDT WED JUN 26 2002

THE NATIONAL WEATHER SERVICE IN PENDLETON HAS ISSUED A 

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

*   UNTIL 645 PM PDT...

*   AT 618 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
    A LINE OF SEVERE THUNDERSTORMS FROM NORTHWESTERN WALLOWA COUNTY 
    TO  SOUTH CENTRAL WALLOWA COUNTY...OR FROM 34 MILES NORTHWEST OF
    ENTERPRISE TO 6 MILES SOUTHWEST OF ENTERPRISE...MOVING NORTH AT 
    20 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  RURAL CENTRAL WALLOWA COUNTY AT 630 PM PDT

HAIL ONE TO 1 1/2 INCH IN DIAMETER CAN BE EXPECTED WITH THIS STORM.

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 Jun 26, 2:30 PM PDT, 3 hours 50 minutes earlier.

Area forecast discussion, Jun 26, 2:30 PM PDT, 3 hours 50 minutes before

NORTHEAST OREGON/SOUTHEAST WASHINGTON FORECAST DISCUSSION...CORRECTED
NATIONAL WEATHER SERVICE PENDLETON OR
230 PM PDT WED JUN 26 2002

CONCERN IS WITH PRECIPITATION CHANCES TONIGHT.

CONVECTIVE ACTIVITY WAS DEVELOPING OVER AREA MOUNTAINS AND IS
EXPECTED TO MOVE INTO THE VALLEYS TONIGHT. MID LEVEL LOW PRESSURE
OVER NEVADA IS BEGINNING TO ADVANCE NORTH AND SHOULD BE IN SE OREGON
THIS EVENING. SFC DEW POINTS WERE IN THE UPPER 50S AND WILL COMBINE
WITH THE HOT TEMPERATURES AND THE LOW TO PRODUCE THUNDERSTORMS THIS
EVENING. THE FAVORED ETA MODEL INDICATED AN INVERTED V SOUNDING OVER
PDT AND THE POTENTIAL FOR DAMAGING DOWNBURST ACROSS THE AREA IS
POSSIBLE. THE CONVECTIVE ACTIVITY IS EXPECTED TO PERSIST INTO THE
EVENING AHEAD OF A COOL AND STABLE MARINE PUSH OF AIR FROM THE WEST.
THIS STABLE AIR WILL SPILL INTO THE CENTRAL FORECAST AREA BY
MORNING. THE EASTERN COUNTY WARNING AREA APPEARS TO BE SPARED FROM
THIS MARINE AIR AND REMAINS UNSTABLE ON THURSDAY WHERE I WILL KEEP
PRECIPITATION CHANCES.

LOW LEVEL TEMPERATURES FALL SEVERAL DEGREES CELSIUS AND I EXPECT
AFTERNOON HIGHS TO BE COOLER ACROSS THE REGION FOR THURSDAY. BY
FRIDAY ANOTHER SHORT WAVE MOVES ACROSS THE AREA AND WITH MID LEVEL
MOISTURE INCREASING...SHOWER ACTIVITY IS POSSIBLE MAINLY OVER AREA
MOUNTAINS TO THE EAST. VPAPOL

EXTENDED...MODELS ARE IN BETTER AGREEMENT TODAY WITH THE LONG WAVE
TROUGH MOVING INTO THE PACIFIC NORTHWEST ON SUNDAY THROUGH TUESDAY
GIVING A CHANCE OF SHOWERS MAINLY OVER THE MOUNTAIN AREAS. A
SHORTWAVE TROUGH MOVES OVER WASHINGTON ON WEDNESDAY BUT THE
MODELS ARE DISAGREEING IN THIS SOLUTION...GIVING ME LOW CONFIDENCE
IN WEDNESDAYS FORECAST. JR

PDT 3111  ALW 3111  PSC 311-  YKM 2--0

KPDT...VCP32/CSR21...OPERATIONAL.

.KPDT...NONE.

In the hours before

Local storm report, Jun 26, 4:47 PM PDT, 1 hour 33 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PENDLETON OREGON
447 PM PDT WED JUN 26 2002

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

0420 PM    6 NNW MONUMENT            OR   .75 INCH HAIL
06/26/02   GRANT                          REPORTED BY STORM
                                          SPOTTER.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 26, 6:32 PM PDT	Severe Thunderstorm Warning	PDT	Union, Wallowa	13 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.