Alert archive / Washington / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 28, NWS Pendleton, OR
NWS Pendleton, OR issued this severe thunderstorm warning at Jul 12, 2001, 7:13 PM PDT for Umatilla County, Oregon; Benton County, Walla Walla County, Washington. It was in force for 62 min. 1 report 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
- Jul 12, 2001, 7:13 PM PDT (02:13 UTC)
- Expired
- Jul 12, 2001, 8:15 PM PDT
- In force
- 62 min
- Issued by
- NWS Pendleton, OR
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Umatilla County, OR, Benton County, WA, Walla Walla County, WA
The radar
The Pendleton radar (KPDT), 37 km from the middle of the area, began a volume at 02:13 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 12, 8:00 PM PDT | Thunderstorm Wind 52 M | Richland, WA | A wind gust of 60 mph was measured at one of the observing sites on the Hanford Reservation. |
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 00:00Z, 2.2 hours before the alert went out and 267 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
- 408 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 2357 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 4 m²/s²
- 0-3 km storm-relative helicity
- 60 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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 Jul 12, 2:20 PM PDT, 4 hours 53 minutes earlier.
Area forecast discussion, Jul 12, 2:20 PM PDT, 4 hours 53 minutes before
NORTHEAST OREGON/SOUTHEAST WASHINGTON FORECAST DISCUSSION NATIONAL WEATHER SERVICE PENDLETON OR 220 PM PDT THU JUL 12 2001 ANOTHER ACTIVE NIGHT IS ON TAP FOR THE FORECAST AREA TONIGHT. TWO FEATURES WILL BRING CONVECTIVE WEATHER TO THE FORECAST AREA. THE UPPER LOW OVER SOUTHEAST OREGON WILL PROVIDE LOW LEVEL UPSLOPE FLOW TO THE EAST SLOPES OF THE WASHINGTON CASCADES. THIS LOCATION IS ALREADY UNSTABLE...HAVING HAD SOME SHOWERS EARLIER TODAY...AND CUMULUS CLOUDS ALREADY DEVELOPING AT THIS TIME. THE SECOND WAVE... WHICH IS NOT HANDLED WELL BY ANY OF THE MODELS...IS QUICKLY MAKING ITS WAY NORTHEAST TOWARD OREGON. THE IR AND WATER VAPOR BOTH SHOW GOOD CONVECTION ON THE FRONT END OF THIS WAVE OVER NORTHERN CALIFORNIA. THIS SECOND FEATURE WILL REACH THE OCHOCO MOUNTAINS AND JOHN DAY HIGHLANDS NEAR 00Z AND BE NEAR THE FOOTHILLS AND THE WALLOWAS BETWEEN 03-05Z. THIS WILL KEEP CONVECTIVE ACTIVITY IN THE EASTERN ZONES GOING THROUGH THE OVERNIGHT HOURS. WITH THE INSTABILITY PARAMETERS AS HIGH AS THEY ARE FROM CENTRAL OREGON THROUGH NORTHEAST OREGON...EXPECT SOME MARGINALLY SEVERE STORMS. SPC HAS PUT CENTRAL AND EASTERN OREGON IN THE SLIGHT RISK AREA FOR TODAY. AN UPPER TROUGH WILL SLOWLY APPROACH THE PACIFIC NORTHWEST BY THE END OF THE SHORT TERM AS THE UPPER RIDGE OVER THE SOUTHWEST US BEGINS TO SHIFT EAST. SINCE THE TROUGH TAKES ITS TIME APPROACHING THE COAST...A STRONG MARINE PUSH IS NOT EVIDENT. HOWEVER EXPECT WEAK LITTLE WAVES OF COOLER MARINE AIR TO MOVE THROUGH THE FORECAST AREA STARTING FRIDAY EVENING. WITH THE SOUTHWEST FLOW APPROACHING...THE UNSTABLE AIR WILL SHIFT EVER SO SLOWLY EAST AND SOUTH OVER THE NEXT 36-48 HOURS. THIS WILL RELEGATE THE THUNDERSTORM THREAT TO MAINLY OVER THE WALLOWAS...JOHN DAY HIGHLANDS AND BAKER COUNTY BY SATURDAY. TEMPERATURES WILL REMAIN PERSISTENT FOR ONE MORE DAY...THEN COOL SLIGHTLY SATURDAY. THINK GUIDANCE IS A BIT TOO LOW FOR SATURDAY...SO HAVE ADJUSTED ACCORDINGLY. MEAD IN THE EXTENDED...AS THE UPPER LEVEL PATTERN SHIFTS EAST THIS WEEKEND...THE UPPER TROUGH IN THE GULF OF ALASKA WILL SHIFT INTO THE PACNW BY MONDAY. THUS CONDITIONS WILL REMAIN UNSETTLED...BUT WILL BE 10 TO 15 DEGREES COOLER AS MARINE AIR SETTLES OVER THE AREA. THIS MOIST MARINE AIR SHOULD REDUCE THE INSTABILITY ACROSS THE AREA... AND ONLY EXPECT SHOWERY PRECIP WITH NO THUNDERSTORMS. GKH PDT 5221 ALW 5221 PSC 2110 YKM 3100 .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 |
|---|---|---|---|---|
| Jul 12, 6:35 PM PDT | Severe Thunderstorm Warning | PDT | Morrow, Umatilla | 40 min |
Nearby
Severe Thunderstorm Warnings in Washington, 2001Severe Thunderstorm Warnings in Oregon, 2001Every severe thunderstorm warning in 2001
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; radar from the NEXRAD Level II archive.