Alert archive / Washington / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 18, NWS Pendleton, OR
NWS Pendleton, OR issued this severe thunderstorm warning at Jul 7, 2002, 11:21 PM PDT for Columbia County, Washington; Wallowa County, Oregon. It was in force for 69 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
- Jul 7, 2002, 11:21 PM PDT (06:21 UTC)
- Expired
- Jul 8, 2002, 12:30 AM PDT
- In force
- 69 min
- Issued by
- NWS Pendleton, OR
- Area
- Counties, with a storm outline in the text
Counties Wallowa County, OR, Columbia County, WA
The radar
The Pendleton radar (KPDT), 92 km from the middle of the area, began a volume at 06:23 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
Spokane, WA (KOTX), launched 00:00Z, 6.4 hours before the alert went out and 210 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
- 221 J/kg
- Mixed-layer CIN
- -242 J/kg
- Mixed-layer LCL
- 2320 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 75 m²/s²
- 0-3 km storm-relative helicity
- 150 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
768
WUUS56 KPDT 080621
SVRPDT
ORC063-WAC013-080730-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PENDLETON OR
1121 PM PDT SUN JUL 7 2002
THE NATIONAL WEATHER SERVICE IN PENDLETON HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTHWESTERN WALLOWA COUNTY IN NORTHEAST OREGON
EASTERN COLUMBIA COUNTY IN SOUTHEAST WASHINGTON
* UNTIL 1230 AM PDT
* AT 1121 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM OVER EXTREME NORTH CENTRAL UNION COUNTY...OR
ABOUT 26 MILES EAST OF MILTON-FREEWATER...MOVING NORTH AT 45 MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
RURAL SOUTHEASTERN COLUMBIA COUNTY AT 1140 PM PDT
RURAL EASTERN COLUMBIA COUNTY AT 1150 PM PDT
RURAL NORTHERN COLUMBIA COUNTY AT 1210 AM PDT
THIS STORM HAS A HISTORY OF PRODUCING DAMAGING WINDS AND LARGE HAIL.
LAT...LON 4587 11796 4586 11774 4602 11761 4631 11764
4647 11782What 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 Jul 7, 8:30 PM PDT, 2 hours 51 minutes earlier.
Area forecast discussion, Jul 7, 8:30 PM PDT, 2 hours 51 minutes before
NORTHEAST OREGON/SOUTHEAST WASHINGTON FORECAST DISCUSSION NATIONAL WEATHER SERVICE PENDLETON OR 830 PM PDT SUN JUL 7 2002 A LOW PRESSURE SYSTEM IS CROSSING OVER THE CASCADES. THE SYSTEM IS LIFTING THE WARM MOIST LOW LEVEL AIR EAST OF THE CASCADES RESULTING IN SCATTERED THUNDERSTORMS. SEVERAL THUNDERSTORMS HAVE BEEN SEVERE WITH WITH .75 INCH HAIL AND WIND GUSTS IN EXCESS OF 50 MPH. THE STRONGEST WIND GUST REPORTED SO FAR IS 76 MPH AT THE PASCO AIRPORT. THESE WINDS HAVE REDUCED VISIBILITIES BRIEFLY TO AS LOW AS ONE QUARTER MILE IN THE COLUMBIA BASIN AND ALONG THE FOOTHILLS OF THE BLUES. THE FIRST BAND OF THUNDERSTORMS HAS MOVED INTO THE NORTHERN PORTION OF THE COLUMBIA BASIN. HOWEVER...A SECOND BAND OVER CENTRAL OREGON IS SHOWING SIGNS OF INCREASING IN INTENSITY AS IT MOVES NORTH THIS EVENING. PDT 3200 ALW 3200 PSC 3000 YKM 3000 KPDT...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 |
|---|---|---|---|---|
| Jul 7, 7:11 PM PDT | Severe Thunderstorm Warning | PDT | Benton, Franklin | 49 min |
| Jul 7, 7:52 PM PDT | Severe Thunderstorm Warning | PDT | Franklin | 38 min |
| Jul 7, 9:04 PM PDT | Severe Thunderstorm Warning | PDT | Benton | 41 min |
| Jul 7, 9:40 PM PDT | Severe Thunderstorm Warning | PDT | Yakima | 50 min |
| Jul 7, 9:57 PM PDT | Severe Thunderstorm Warning | PDT | Benton, Franklin | 48 min |
| Jul 7, 5:04 PM PDT | Severe Thunderstorm Warning | PDT | Union | 56 min |
| Jul 7, 5:27 PM PDT | Severe Thunderstorm Warning | PDT | Crook, Jefferson | 33 min |
| Jul 7, 6:02 PM PDT | Severe Thunderstorm Warning | PDT | Umatilla, Union | 43 min |
| Jul 7, 6:03 PM PDT | Severe Thunderstorm Warning | PDT | Jefferson, Wasco | 27 min |
| Jul 7, 6:28 PM PDT | Severe Thunderstorm Warning | PDT | Gilliam, Sherman | 47 min |
| Jul 7, 6:31 PM PDT | Severe Thunderstorm Warning | PDT | Umatilla, Union | 44 min |
| Jul 7, 8:52 PM PDT | Severe Thunderstorm Warning | PDT | Morrow | 28 min |
| Jul 7, 10:08 PM PDT | Severe Thunderstorm Warning | PDT | Union | 52 min |
| Jul 7, 10:44 PM PDT | Severe Thunderstorm Warning | PDT | Union | 46 min |
| Jul 8, 1:52 AM PDT | Severe Thunderstorm Warning | PDT | Wallowa | 23 min |
| Jul 8, 2:16 AM PDT | Severe Thunderstorm Warning | PDT | Wallowa | 44 min |
Nearby
Severe Thunderstorm Warnings in Washington, 2002Severe 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.