Alert archive / Oregon / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 43, NWS Pendleton, OR
NWS Pendleton, OR issued this severe thunderstorm warning at Aug 25, 2002, 4:17 PM PDT for Jefferson County, Oregon. It was in force for 43 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 25, 2002, 4:17 PM PDT (23:17 UTC)
- Expired
- Aug 25, 2002, 5:00 PM PDT
- In force
- 43 min
- Issued by
- NWS Pendleton, OR
- Area
- Counties, with a storm outline in the text
County Jefferson County, OR
The radar
The Portland,OR radar (KRTX), 171 km from the middle of the area, began a volume at 23:18 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 25, 4:23 PM PDT | Hail 0.75 | Culver, OR |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
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
Salem/Mcnary, OR (KSLE), launched 12:00Z, 11.3 hours before the alert went out and 129 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 626 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- -10 m²/s²
- 0-3 km storm-relative helicity
- 20 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
846 WUUS56 KPDT 252317 SVRPDT ORC031-260000- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE PENDLETON OR 417 PM PDT SUN AUG 25 2002 THE NATIONAL WEATHER SERVICE IN PENDLETON HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... CENTRAL JEFFERSON COUNTY IN CENTRAL OREGON * UNTIL 500 PM PDT * AT 417 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 9 MILES SOUTHWEST OF CULVER...OR ABOUT 17 MILES SOUTHWEST OF MADRAS...MOVING NORTHEAST AT 20 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... CULVER AT 430 PM PDT METOLIUS AT 435 PM PDT WARM SPRINGS AT 440 PM PDT MADRAS AT 445 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 4481 12170 4440 12168 4439 12102 4480 12095
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 Aug 25, 1:25 PM PDT, 2 hours 52 minutes earlier.
Area forecast discussion, Aug 25, 1:25 PM PDT, 2 hours 52 minutes before
NORTHEAST OREGON/SOUTHEAST WASHINGTON FORECAST DISCUSSION NATIONAL WEATHER SERVICE PENDLETON OR 125 PM PDT SUN AUG 25 2002 SHORT TERM AND FIRE WEATHER...AN UPPER LEVEL SHORT WAVE WILL MOVE ACROSS THE FORECAST AREA THIS AFTERNOON AND TONIGHT. DYNAMIC LIFT AND INSTABILITY ASSOCIATED WITH THE WAVE WILL TRIGGER SCATTERED SHOWERS AND THUNDERSTORMS AS THIS SYSTEM MOVES THROUGH. THE THUNDERSTORMS THIS AFTERNOON AND TONIGHT WILL BE MOSTLY WET AS THE AIR MASS OVER THE AREA IS RATHER MOIST. A WEAK MARINE PUSH WILL BEGIN LATE THIS AFTERNOON ALONG THE EAST SLOPES OF THE CASCADES AND THEN MOVE ACROSS THE REMAINDER OF THE FORECAST AREA THIS EVENING. THIS WILL INCREASE WINDS TONIGHT AND USHER IN A MUCH MORE STABLE AIR MASS FOR MONDAY. THE SHORT WAVE WILL MOVE INTO IDAHO AND MONTANA ON MONDAY WITH NORTHERLY FLOW ALOFT ON THE BACK SIDE OF THE UPPER TROUGH OVER THE FORECAST AREA. ON MONDAY MARGINAL INSTABILITY WILL REMAIN OVER EXTREME NORTHEAST OREGON FOR POSSIBLE ISOLATED THUNDERSTORMS...MAINLY OVER WALLOWA COUNTY. THE UPPER SHORT WAVE WILL STALL OVER MONTANA ON MONDAY BEFORE DIGGING SOUTHWEST INTO IDAHO AND SOUTHEAST OREGON ON TUESDAY. THIS WILL ALLOW SOME WRAP AROUND MOISTURE TO RETURN TO EXTREME EASTERN OREGON FOR SOME SHOWERS AND MOSTLY WET ISOLATED THUNDERSTORMS ON TUESDAY. THE AFOREMENTIONED SHORT WAVE WILL MOVE INTO EASTERN OREGON ON WEDNESDAY FOR A CHANCE OF MAINLY AFTERNOON AND EVENING SHOWERS AND MOSTLY WET THUNDERSTORMS OVER THE MOUNTAINS OF NORTHEAST OREGON. POLAN IN THE EXTENDED...STUBBORN SHORT WAVE/MID LEVEL LOW PRESSURE OVER EASTERN OREGON WILL BEGIN TO WEAKEN AND DRIFT INTO IDAHO THURSDAY. BUT LINGERING MOISTURE REMAINS MAINLY OVER THE EASTERN FORECAST AREA THAT INCLUDES THE BLUE AND WALLOWA MOUNTAINS...WHICH WILL SEE SOME AFTERNOON AND EVENING THUNDERSTORMS. ALSO WITH THE EXITING LOW COMES A LONG WAVE TROUGH ENTERING THE PACIFIC NORTHWEST COAST THURSDAY AFTERNOON AND SOME ISOLATED THUNDERSTORMS MAY DEVELOP OVER THE NORTHERN CASCADES NEAR GOLDENDALE LATE THURSDAY AND INTO THE EVENING. DRIER AIR FILTERS INTO THE CASCADES FRIDAY BUT INSTABILITY PERSISTS OVER THE WALLOWA AND BLUE MOUNTAINS WHERE ISOLATED THUNDERSTORMS ARE POSSIBLE. AS THE TROUGH MOVES EAST AND AWAY FROM THE THE AREA SATURDAY...MUCH DRIER AIR WILL INVADE ALL OF NORTHEAST OREGON AND SOUTHEAST WASHINGTON AND A RETURN TO MOSTLY SUNNY AND WARMER TEMPERATURES ARE LIKELY NEXT WEEKEND. PDT 3000 ALW 3000 PSC 2000 YKM 2000 KPDT...VCP21/PRECIP MODE...OPERATIONAL. .KPDT...NONE.
The office that day
Everything else NWS Pendleton, OR issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 25, 4:07 PM PDT | Severe Thunderstorm Warning | PDT | Umatilla | 38 min |
Nearby
Severe Thunderstorm Warnings in Oregon, 2002Every 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.