Alert archive / Oregon / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 1, NWS Pendleton, OR

June 26, 2002Grant County, Umatilla County, Oregon

NWS Pendleton, OR issued this severe thunderstorm warning at Jun 26, 2002, 3:51 PM PDT for Grant County, Umatilla County, Oregon. It was in force for 39 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: Jun 26, 2002, 3:51 PM PDT (22:51 UTC)
Expired: Jun 26, 2002, 4:30 PM PDT
In force: 39 min
Issued by: NWS Pendleton, OR
Area: Counties, with a storm outline in the text

Counties Grant County, OR, Umatilla County, OR

The radar

The Pendleton radar (KPDT), 77 km from the middle of the area, began a volume at 22:55 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

Boise Airport, ID (KBOI), launched 12:00Z, 10.9 hours before the alert went out and 278 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: 110 J/kg
Mixed-layer CIN: -673 J/kg
Mixed-layer LCL: 3000 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: -40 m²/s²
0-3 km storm-relative helicity: 55 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.

000 
WUUS56 KPDT 262251
SVRPDT
ORC023-059-262330-

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

THE NATIONAL WEATHER SERVICE IN PENDLETON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTH CENTRAL GRANT COUNTY IN EAST CENTRAL OREGON
  SOUTH CENTRAL UMATILLA COUNTY IN NORTHEAST OREGON

* UNTIL 430 PM PDT

* AT 350 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER DALE...OR ABOUT 39 MILES NORTH OF JOHN
  DAY...MOVING NORTHEAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  UKIAH AT 400 PM PDT

HAIL UP TO ONE INCH IN DIAMETER AND WINDS GREATER THAN 55 MPH ARE
EXPECTED FROM THIS STORM. SEEK SHELTER IN A STURDY STRUCTURE UNTIL
THE STORM HAS PASSED.

LAT...LON 4482 11938 4479 11860 4536 11874 4528 11912
          4500 11915

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, 1 hour 21 minutes earlier.

Area forecast discussion, Jun 26, 2:30 PM PDT, 1 hour 21 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.

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.