Alert archive / Washington / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 4, NWS Pendleton, OR

April 29, 2003Klickitat County, Washington

NWS Pendleton, OR issued this severe thunderstorm warning at Apr 29, 2003, 6:26 PM PDT for Klickitat County, Washington. It was in force for 34 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
Apr 29, 2003, 6:26 PM PDT (01:26 UTC)
Expired
Apr 29, 2003, 7:00 PM PDT
In force
34 min
Issued by
NWS Pendleton, OR
Area
Counties, with a storm outline in the text

County Klickitat County, WA

The radar

The Pendleton radar (KPDT), 98 km from the middle of the area, began a volume at 01:29 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

Salem/Mcnary, OR (KSLE), launched 00:00Z, 1.4 hours before the alert went out and 257 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-pSkew-T log-p diagram, Salem/Mcnary, OR at 00:00Z on 2003-04-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 435 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Salem/Mcnary, OR at 00:00Z on 2003-04-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 20 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
435 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
1379 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
20 m²/s²
0-3 km storm-relative helicity
45 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
WUUS56 KPDT 300126 CCA
SVRPDT
WAC039-300200-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PENDLETON OR
622 PM PDT TUE APR 29 2003

THE NATIONAL WEATHER SERVICE IN PENDLETON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN KLICKITAT COUNTY IN CENTRAL WASHINGTON

* UNTIL 700 PM PDT

* AT 622 PM PDT...A NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
  A SEVERE THUNDERSTORM OVER EAST CENTRAL KLICKITAT COUNTY...OR ABOUT
  11 MILES EAST OF BICKLETON OR 22 MILES SOUTH OF GRANDVIEW...MOVING 
  EAST AT 10 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  RURAL NORTHEASTERN KLICKITAT COUNTY AT 640 PM PDT
  RURAL EASTERN KLICKITAT COUNTY AT 650 PM PDT

HAIL TO THE SIZE OF NICKELS IS LIKELY. SEEK SHELTER IN A STURDY 
STRUCTURE UNTIL THE STORM HAS PASSED.

LAT...LON 4605 12015 4587 12019 4584 11990 4601 11988

&

$$

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 Apr 29, 2:20 PM PDT, 4 hours 6 minutes earlier.

Area forecast discussion, Apr 29, 2:20 PM PDT, 4 hours 6 minutes before
NORTHEAST OREGON/SOUTHEAST WASHINGTON FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
220 PM PDT TUE APR 29 2003

CURRENT RADAR IMAGERY BEGINNING TO SHOW SIGNS OF SETTLING DOWN THIS
EVENING. ONE AREA OF CONTINUED CONCERN IS YAKIMA VALLEY EASTWARD TO
THE COLUMBIA BASIN SOUTH OF THE TRI-CITIES WHERE THE ATMOSPHERE
CONINUES TO BE QUITE UNSTABLE. EXPECT THUNDERSTORM ACTIVITY HERE TO
PERSIST THROUGH THE REST OF THE EVENING. THE SOUTHERN END OF THIS
LINE...WHICH EXTENDES INTO THE SOUTHERN BLUE MOUNTAINS AND NORTHERN
GRANT COUNTY IS IN SLIGHTLY MORE STABLE AIR...AND WILL LIKELY
DIMISH. ISOLATED AREAS OF FOG ARE ALSO A POSSIBILITY
OVERNIGHT...PARTICULARLY WHERE THE SKIES HAVE THE OPPORTUNITY TO
CLEAR OUT.  JR

PDT 5321  ALW 5321  PSC 5321  YKM 5321

.KPDT...NONE.
Hazardous weather outlook, Apr 29, 5:20 AM PDT, 13 hours 6 minutes before
ORZ041>050-WAZ024>030-301300-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
520 AM PDT TUE APR 29 2003

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

.DAY ONE...
THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

A SERIES OF WAVES ROTATING AROUND AN UPPER LOW OVER SOUTHWEST OREGON
WILL BRING SCATTERED SHOWERS TO THE REGION TODAY AND TONIGHT.  THE
AIR MASS REMAINS UNSTABLE...AND ISOLATED THUNDERSTORMS ARE EXPECTED
THIS AFTERNOON.  SOME THUNDERSTORMS WILL PRODUCE HEAVY RAIN...SMALL
HAIL...AND GUSTY WINDS.

.DAYS TWO THROUGH SEVEN...

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

ALTHOUGH THE LOW PRESSURE SYSTEM WILL WEAKEN AS IT MOVES OVER THE
PACIFIC NORTHWEST...IT WILL REMAIN STATIONARY THROUGH THURSDAY.
SCATTERED SHOWERS AND ISOLATED AFTERNOON THUNDERSTORMS WILL CONTINUE
WEDNESDAY.  ANOTHER LOW PRESSURE SYSTEM WILL DROP SOUTHWARD FROM
BRITISH COLUMBIA AND INTO THE PACIFIC NORTHWEST THIS WEEKEND FOR
ANOTHER ROUND OF PRECIPITATION.  DRIER CONDITIONS ARE EXPECTED
MONDAY.

.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.

IssuedProductOfficeCountiesLasted
Apr 29, 6:25 PM PDTSevere Thunderstorm WarningPDTKlickitat35 min
Apr 29, 9:12 PM PDTSevere Thunderstorm WarningPDTBenton, Franklin18 min

Nearby

Severe Thunderstorm Warnings in Washington, 2003Every severe thunderstorm warning in 2003

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.