Alert archive / Washington / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 1, NWS Pendleton, OR

May 9, 2000Walla Walla County, Washington; Umatilla County, Oregon

NWS Pendleton, OR issued this severe thunderstorm warning at May 9, 2000, 12:54 PM PDT for Walla Walla County, Washington; Umatilla County, Oregon. It was in force for 46 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
May 9, 2000, 12:54 PM PDT (19:54 UTC)
Expired
May 9, 2000, 1:40 PM PDT
In force
46 min
Issued by
NWS Pendleton, OR
Area
Whole counties

Counties Umatilla County, OR, Walla Walla County, WA

What was reported inside it

TimeReportWhereRemark
May 9, 1:20 PM PDTHail 0.75Hermiston, OR
May 9, 1:40 PM PDTHail 0.75Walla Walla, WA

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.

The nearest sounding before it

Spokane, WA (KOTX), launched 12:00Z, 7.9 hours before the alert went out and 260 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, Spokane, WA at 12:00Z on 2000-05-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Spokane, WA at 12:00Z on 2000-05-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 52 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1183 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
52 m²/s²
0-3 km storm-relative helicity
69 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 091954
SVRPDT
ORC059-WAC071-092040-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PENDLETON OR
1254 PM PDT TUE MAY 9 2000

THE NATIONAL WEATHER SERVICE IN PENDLETON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WALLA WALLA COUNTY IN SOUTHEASTERN WASHINGTON
  NORTHERN UMATILLA COUNTY IN NORTHEASTERN OREGON

* UNTIL 140 PM PDT

* AT 1251 PM PDT... DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 5
  MILES WEST OF PENDLETON... MOVING NORTHEAST AT 30 MPH.

* THIS STORM CAN BE EXPECTED IN THE VICINITY OF...
PENDLETON                    AROUND 101 PM PDT
MISSION                      AROUND 116 PM PDT
CAYUSE                       AROUND 124 PM PDT
HELIX                        AROUND 127 PM PDT
ADAMS                        AROUND 128 PM PDT

THIS IS A DANGEROUS STORM! STAY INDOORS AWAY FROM WINDOWS.  THIS
STORM HAS PRODUCED 3/4 INCH HAIL ON THE SOUTH SIDE OF PENDLETON.

DI/GKH


&

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 May 9, 8:30 AM PDT, 4 hours 24 minutes earlier.

Area forecast discussion, May 9, 8:30 AM PDT, 4 hours 24 minutes before
NORTHEAST OREGON/SOUTHEAST WASHINGTON FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
830 AM PDT TUE MAY 9 2000

AN UPPER LEVEL LOW LOCATED 45N/132W WILL SAG SOUTHEAST TOWARDS
SOUTHWEST OREGON BY TOMORROW MORNING. THIS IS IN RESPONSE TO
AMPLIFYING TROUGH WEST OF THE OREGON AND WASHINGTON COASTS.

IN OUR FORECAST AREA...SHOWERS CONTINUE THIS MORNING IN THE BLUE
MOUNTAINS...THE EASTERN SLOPES OF THE WASHINGTON CASCADES AND THE
EASTERN COLUMBIA RIVER GORGE. THE NEW 12Z ETA INDICATES SLIGHTLY
UNSTABLE CONDITIONS IN NORTHEAST OREGON AND SOUTHEAST WASHINGTON
TODAY. THUS WILL MAINTAIN ONGOING FORECAST OF ISOLATED
THUNDERSTORMS IN THE BLUE MOUNTAINS AND THE FOOTHILLS.

VERY COLD AIR ALOFT WILL ARRIVE OVER OUR REGION LATE TODAY AND EARLY
WEDNESDAY...LOWERING SNOW LEVELS TO JUST OVER 4000 FEET IN THE BLUE
MOUNTAINS BY WEDNESDAY MORNING. DENMAN/GKH

PDT 6563  ALW 6563  PSC 5453  YKM 4443

.KPDT...WSR-88D...VCP21/CSR21...OPERATIONAL.

.KPDT...NONE.

The office that day

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

IssuedProductOfficeCountiesLasted
May 9, 3:21 PM PDTSevere Thunderstorm WarningPDTKlickitat64 min
May 9, 1:41 PM PDTSevere Thunderstorm WarningPDTUmatilla49 min

Nearby

Severe Thunderstorm Warnings in Washington, 2000Severe Thunderstorm Warnings in Oregon, 2000Every severe thunderstorm warning in 2000

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.