Alert archive / Oregon / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 8, NWS Pendleton, OR

June 26, 2004Wallowa County, Oregon

NWS Pendleton, OR issued this severe thunderstorm warning at Jun 26, 2004, 7:24 PM PDT for Wallowa County, Oregon. It was in force for 51 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, 2004, 7:24 PM PDT (02:24 UTC)
Expired: Jun 26, 2004, 8:15 PM PDT
In force: 51 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), 131 km from the middle of the area, began a volume at 02:26 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, 2.4 hours before the alert went out and 237 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: 740 J/kg
Mixed-layer CIN: -50 J/kg
Mixed-layer LCL: 3086 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 15 m²/s²
0-3 km storm-relative helicity: 10 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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, 2:20 PM PDT, 5 hours 4 minutes earlier.

Area forecast discussion, Jun 26, 2:20 PM PDT, 5 hours 4 minutes before

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Hazardous weather outlook, Jun 26, 5:10 AM PDT, 14 hours 14 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OREGON
510 AM PDT SAT JUN 26 2004

ORZ041>050-WAZ024>030-271200-
NORTH CENTRAL OREGON-CENTRAL OREGON-LOWER COLUMBIA BASIN (OR)-
FOOTHILLS OF THE BLUE MOUNTAINS (OR)-BLUE MOUNTAINS-JOHN DAY BASIN-
OCHOCO-JOHN DAY HIGHLANDS-GRANDE RONDE VALLEY-WALLOWA COUNTY-
EASTERN COLUMBIA RIVER GORGE (WA)-
EAST SLOPES OF THE SOUTHERN CASCADES-KITTITAS VALLEY-YAKIMA VALLEY-
LOWER COLUMBIA BASIN (WA)-FOOTHILLS OF THE BLUE MOUNTAINS (WA)-
NORTHWEST BLUE MOUNTAINS-
510 AM PDT SAT JUN 26 2004

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL AND NORTHEAST OREGON
AS WELL AS SOUTH CENTRAL AND SOUTHEAST WASHINGTON.

.DAY ONE...TODAY AND TONIGHT

SLIGHT RISK OF SEVERE THUNDERSTORMS
     FOOTHILLS OF THE BLUE MOUNTAINS (WA), NORTHWEST BLUE MOUNTAINS,
     FOOTHILLS OF THE BLUE MOUNTAINS (OR), BLUE MOUNTAINS, GRANDE
     RONDE VALLEY, WALLOWA COUNTY

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS TODAY AND TONIGHT
NORTH AND EAST OF A LINE FROM UNION TO MEACHAM TO WALLA WALLA.
THIS INCLUDES THE CITIES OF WESTON...MILTON-FREEWATER...
DAYTON...BLUEWOOD SKI RESORT...UNION...ENTERPRISE...AND IMNAHA. THE
MAIN THREATS FROM THESE STORMS WILL BE LARGE HAIL...WINDS GUSTING TO
60 MPH...AND HEAVY RAIN.

GENERAL THUNDERSTORMS
     EAST SLOPES OF THE SOUTHERN CASCADES, KITTITAS VALLEY, YAKIMA
     VALLEY, LOWER COLUMBIA BASIN (WA), LOWER COLUMBIA BASIN (OR),
     FOOTHILLS OF THE BLUE MOUNTAINS (OR), JOHN DAY BASIN,
     OCHOCO-JOHN DAY HIGHLANDS

A LARGE LOW PRESSURE SYSTEM OFF THE EASTERN PACIFIC WILL EDGE
TOWARDS THE COAST AND WILL SPREAD MID LEVEL MOISTURE EAST OF THE
CASCADES.  THE AIR MASS IS ALREADY UNSTABLE...AND SCATTERED
THUNDERSTORMS WILL DEVELOP TODAY AND TONIGHT OVER THE
EASTERN MOUNTAINS WITH ISOLATED SHOWERS AND THUNDERSTORMS ELSEWHERE.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

ISOLATED SHOWERS AND THUNDERSTORMS ARE EXPECTED SUNDAY THROUGH
WEDNESDAY.  THE UPPER LOW WILL MOVE INTO BRITISH COLUMBIA...LEAVING
THE PACIFIC NORTHWEST UNDER A FAIRLY MOIST SOUTHERLY FLOW ALOFT. A
DRIER WESTERLY FLOW IS EXPECTED LATE IN THE WEEK.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED.

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 26, 8:53 PM PDT	Severe Thunderstorm Warning	PDT	Wallowa	52 min

Nearby

Severe Thunderstorm Warnings in Oregon, 2004 Every severe thunderstorm warning in 2004

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.