Alert archive / Washington / Severe Thunderstorm Warnings in 2000
Severe Thunderstorm Warning 1, NWS Pendleton, OR
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
| Time | Report | Where | Remark |
|---|---|---|---|
| May 9, 1:20 PM PDT | Hail 0.75 | Hermiston, OR | |
| May 9, 1:40 PM PDT | Hail 0.75 | Walla 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.
- 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
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.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 9, 3:21 PM PDT | Severe Thunderstorm Warning | PDT | Klickitat | 64 min |
| May 9, 1:41 PM PDT | Severe Thunderstorm Warning | PDT | Umatilla | 49 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.