Severe Thunderstorm Warning 41, NWS Pendleton, OR

Issued

Aug 20, 2002, 2:54 PM PDT (21:54 UTC)

Expired

Aug 20, 2002, 3:30 PM PDT

In force

36 min

Issued by

NWS Pendleton, OR

Area

Counties, with a storm outline in the text

County Wallowa County, OR

The Pendleton radar (KPDT), 120 km from the middle of the area, began a volume at 21:53 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.

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.

000 
WUUS56 KPDT 202154
SVRPDT
ORC063-202230-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PENDLETON OR
253 PM PDT TUE AUG 20 2002

THE NATIONAL WEATHER SERVICE IN PENDLETON HAS ISSUED A

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

* UNTIL 330 PM PDT

* AT 253 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER TROY...OR ABOUT 32 MILES NORTH OF
  ENTERPRISE...MOVING NORTHEAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  PARADISE AT 300 PM PDT

HAIL TO ONE INCH...DAMAGING WINDS...AND HEAVY RAINFALL ARE LIKELY 
WITH THIS STORM. TAKE COVER IN A STURDY BUILDING UNTIL THE STORM HAS 
PASSED.

LAT...LON 4569 11774 4516 11708 4564 11661 4598 11693
          4598 11772

NWS Pendleton, OR wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 20, 2:35 PM PDT, 19 minutes earlier.

NORTHEAST OREGON/SOUTHEAST WASHINGTON FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
235 PM PDT TUE AUG 20 2002

FIRE WEATHER...THE MAIN FIRE WEATHER CONCERN IS THE LIGHTNING.
HOWEVER...THE AIR MASS HAS MOISTENED ENOUGH FOR SIGNIFICANT SHOWERS
WITH MOST STORMS. ONE FIRE SOUTHWEST OF JOHN DAY REPORTED SMALL HAIL
WITH A STORM.  THE MAIN MESSAGE WILL BE HIGHER HUMIDITIES AND SOME
PRECIPITATION WITH SHOWERS.

A VERY COOL UPPER LEVEL LOW PRESSURE IS DEVELOPING OVER NORTHEAST
OREGON NEAR PENDLETON THIS AFTERNOON.  THIS LOW IS LIKELY TO PERSIST
OVER NORTHEAST OREGON INTO WEDNESDAY BEFORE DRIFTING INTO SOUTHERN
OREGON BY FRIDAY. THE MAIN AFFECT WILL BE TO KEEP THE ATMOSPHERE
QUITE COOL...MOIST AND UNSTABLE WEDNESDAY WITH SOME DRYING THURSDAY.
 HIGHER PEAKS OF EASTERN OREGON MAY ALSO SEE A DUSTING OF SNOW
OVERNIGHT AS SNOW LEVELS FALL TO NEAR 7500 FEET.  LOTS OF
UNCERTAINTY IN THE TRACK OF THIS UPPER LOW PAST 72 HOURS...BUT
BELIEVE IS WILL SHIFT AGAIN NORTHWARD FRIDAY AFTERNOON AND SATURDAY.
ALSO...TYPICALLY UPPER LOWS IN SUCH A LIGHT UPPER LEVEL WIND PATTERN
TEND TO PERSIST LONGER THAN THE MODELS SHOW.  AS SUCH WILL KEEP SOME
SHOWERS IN THE FORECAST OVER THE WEEKEND ACROSS NORTHEAST OREGON AND
SOUTHEAST WASHINGTON.  A DRIER WESTERLY FLOW MAY DEVELOP EARLY NEXT
WEEK.  HENRY/BAUCK

PDT 3221  ALW 3221  PSC 2110 YKM 2000

KPDT...VCP21/PRECIP MODE...OPERATIONAL.

.KPDT...NONE.

Severe Thunderstorm Warnings in Oregon, 2002Every severe thunderstorm warning in 2002

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.