Alert archive / Oregon / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 4, NWS Pendleton, OR
NWS Pendleton, OR issued this severe thunderstorm warning at May 23, 2001, 5:59 PM PDT for Jefferson County, Wasco County, Oregon. It was in force for 46 min. 1 report came from inside the area while it was in force.
The area
The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.
The facts
- Issued
- May 23, 2001, 5:59 PM PDT (00:59 UTC)
- Expired
- May 23, 2001, 6:45 PM PDT
- In force
- 46 min
- Issued by
- NWS Pendleton, OR
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Jefferson County, OR, Wasco County, OR
The radar
The Portland,OR radar (KRTX), 185 km from the middle of the area, began a volume at 00:58 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 |
|---|---|---|---|
| May 23, 6:15 PM PDT | Hail 1.25 | Gateway, OR |
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
Salem/Mcnary, OR (KSLE), launched 00:00Z, 1.0 hours before the alert went out and 158 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
- 667 J/kg
- Mixed-layer CIN
- -151 J/kg
- Mixed-layer LCL
- 1829 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- -15 m²/s²
- 0-3 km storm-relative helicity
- 30 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.1
The text
As transmitted, in the capitals the NWS used until 2016.
927 WUUS56 KPDT 240100 SVRPDT ORC031-065-240145- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE PENDLETON OR 559 PM PDT WED MAY 23 2001 THE NATIONAL WEATHER SERVICE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTH CENTRAL JEFFERSON COUNTY IN CENTRAL OREGON SOUTHEASTERN WASCO COUNTY IN NORTH CENTRAL OREGON * UNTIL 645 PM PDT * AT 559 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 22 MILES SOUTHWEST OF ANTELOPE...OR ABOUT 30 MILES NORTH OF PRINEVILLE...MOVING NORTHEAST AT 20 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... ANTELOPE AT 645 PM PDT LARGE HAIL...DAMAGING WINDS...AND HEAVY RAINFALL ARE LIKELY WITH THIS STORM. TAKE COVER IN A STURDY BUILDING UNTIL THE STORM HAS PASSED. LAT...LON 4472 12124 4459 12106 4488 12065 4501 12082
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 23, 2:20 PM PDT, 3 hours 39 minutes earlier.
Area forecast discussion, May 23, 2:20 PM PDT, 3 hours 39 minutes before
NORTHEAST OREGON/SOUTHEAST WASHINGTON FORECAST DISCUSSION NATIONAL WEATHER SERVICE PENDLETON OR 220 PM PDT WED MAY 23 2001 THERMAL RIDGE OVER THE FORECAST AREA RESULTING IN RECORD HIGH TEMPERATURES TODAY...WITH READINGS AROUND 90 IN THE MOUNTAINS AND NEAR 100 IN THE COLUMBIA BASIN. AREAS OF CUMULUS CLOUDS HAVE DEVELOPED OVER THE MOUNTAINS OF CENTRAL AND EASTERN OREGON THIS AFTERNOON. CAP MAY BE TOO STRONG TO BREAK AS NO TOWERING CUMULUS CLOUDS HAVE BEEN REPORTED THUS FAR. WILL KEEP AN ISOLATED MENTION OF SHOWERS AND THUNDERSTORMS OVER THE CENTRAL AND OCHOCO MOUNTAINS AND THE JOHN DAY HIGHLANDS THIS EVENING HOWEVER. THURSDAY THE UPPER RIDGE AND THERMAL RIDGE SHIFT EAST OVER EASTERN OREGON/WASHINGTON AND THE IDAHO BORDER. A DISTURBANCE OUT AT 130W/35N WILL MOVE INTO CENTRAL AND EASTERN OREGON. THIS WILL ACT AS A FOCUSING MECHANISM TO SET OFF SHOWERS AND THUNDERSTORMS OVER THE CENTRAL THROUGH NORTHEAST MOUNTAINS. ETA MODEL DID PICK UP ON THIS FEATURE...SO AM USING THAT MODEL FOR THIS PACKAGE. TEMPERATURES OVER THE WESTERN SECTIONS OF THE FORECAST AREA WILL COOL ABOUT 8 TO 10 DEGREES WHILE THE EASTERN SECTIONS ONLY COOL 2 TO 3 DEGREES. GOOD INSTABILITY AND SHALLOW MOISTURE LINGER OVER EASTERN OREGON FRIDAY...SO WILL LEAVE MENTION OF SHOWERS AND THUNDERSTORMS THROUGH FRIDAY. TEMPERATURES WILL COOL DOWN ANOTHER FEW DEGREES FRIDAY AS THERMAL RIDGE PUSHES FURTHER TO THE EAST. MEAD. EXTENDED...A SLIGHT INCREASE IN MOISTURE AND INSTABILITY COMBINED WITH A WEAK IMPULSE TRACKING OVER THE PACIFIC NORTHWEST WILL ALLOW FOR A SLIGHT CHANCE OF THUNDERSTORM DEVELOP ON SATURDAY. AN UPPER TROUGH WILL SWEEP ACROSS THE REGION SATURDAY AND SUNDAY FOR A CHANCE OF SHOWERS AND THE BEGINNING OF A COOLING TREND. SHOWERS WILL LINGER OVER THE EASTERN MOUNTAINS INTO MEMORIAL DAY...THE REST OF THE AREA SHOULD BE DRY. BEHIND THE TROUGH...WEAK RIDGING WILL DEVELOP...BECOMING ZONAOL BY THE END OF THE PERIOD FOR CONTINUED DRY CONDITIONS. MJB. PDT 0110 ALW 0110 PSC 0000 YKM 0000 .KPDT...WSR-88D...VCP32/CSR21...OPERATIONAL. .KPDT...NONE.
Nearby
Severe 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.