Alert archive / Oregon / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 17, NWS Pendleton, OR

July 7, 2002Union County, Oregon

NWS Pendleton, OR issued this severe thunderstorm warning at Jul 7, 2002, 10:44 PM PDT for Union County, Oregon. It was in force for 46 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jul 7, 2002, 10:44 PM PDT (05:44 UTC)
Expired
Jul 7, 2002, 11:30 PM PDT
In force
46 min
Issued by
NWS Pendleton, OR
Area
Counties, with a storm outline in the text

County Union County, OR

The radar

The Pendleton radar (KPDT), 78 km from the middle of the area, began a volume at 05:48 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.

The nearest sounding before it

Boise Airport, ID (KBOI), launched 00:00Z, 5.7 hours before the alert went out and 241 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, Boise Airport, ID at 00:00Z on 2002-07-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 796 joules per kilogram.LCLLFCEL10008507005003002001001 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, Boise Airport, ID at 00:00Z on 2002-07-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 53 square meters per square second.193958Sfc1 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
796 J/kg
Mixed-layer CIN
-90 J/kg
Mixed-layer LCL
3335 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
53 m²/s²
0-3 km storm-relative helicity
60 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

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 7, 8:30 PM PDT, 2 hours 14 minutes earlier.

Area forecast discussion, Jul 7, 8:30 PM PDT, 2 hours 14 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.

IssuedProductOfficeCountiesLasted
Jul 7, 5:04 PM PDTSevere Thunderstorm WarningPDTUnion56 min
Jul 7, 5:27 PM PDTSevere Thunderstorm WarningPDTCrook, Jefferson33 min
Jul 7, 6:02 PM PDTSevere Thunderstorm WarningPDTUmatilla, Union43 min
Jul 7, 6:03 PM PDTSevere Thunderstorm WarningPDTJefferson, Wasco27 min
Jul 7, 6:28 PM PDTSevere Thunderstorm WarningPDTGilliam, Sherman47 min
Jul 7, 6:31 PM PDTSevere Thunderstorm WarningPDTUmatilla, Union44 min
Jul 7, 8:52 PM PDTSevere Thunderstorm WarningPDTMorrow28 min
Jul 7, 10:08 PM PDTSevere Thunderstorm WarningPDTUnion52 min
Jul 7, 11:21 PM PDTSevere Thunderstorm WarningPDTWallowa69 min
Jul 8, 1:52 AM PDTSevere Thunderstorm WarningPDTWallowa23 min
Jul 8, 2:16 AM PDTSevere Thunderstorm WarningPDTWallowa44 min
Jul 7, 7:11 PM PDTSevere Thunderstorm WarningPDTBenton, Franklin49 min
Jul 7, 7:52 PM PDTSevere Thunderstorm WarningPDTFranklin38 min
Jul 7, 9:04 PM PDTSevere Thunderstorm WarningPDTBenton41 min
Jul 7, 9:40 PM PDTSevere Thunderstorm WarningPDTYakima50 min
Jul 7, 9:57 PM PDTSevere Thunderstorm WarningPDTBenton, Franklin48 min

Nearby

Severe 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.