Alert archive / Oregon / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 73, NWS Pendleton, OR

August 6, 1997Grant County, Oregon

NWS Pendleton, OR issued this severe thunderstorm warning at Aug 6, 1997, 7:48 PM PDT for Grant County, Oregon. It was in force for 57 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
Aug 6, 1997, 7:48 PM PDT (02:48 UTC)
Expired
Aug 6, 1997, 8:45 PM PDT
In force
57 min
Issued by
NWS Pendleton, OR
Area
Whole counties

County Grant County, OR

The nearest sounding before it

Salem/Mcnary, OR (KSLE), launched 00:00Z, 2.8 hours before the alert went out and 319 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, Salem/Mcnary, OR at 00:00Z on 1997-08-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 33 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, Salem/Mcnary, OR at 00:00Z on 1997-08-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -26 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
33 J/kg
Mixed-layer CIN
-461 J/kg
Mixed-layer LCL
1917 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
-26 m²/s²
0-3 km storm-relative helicity
49 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

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 Aug 6, 7:44 PM PDT, 4 minutes earlier.

Area forecast discussion, Aug 6, 7:44 PM PDT, 4 minutes before
NORTHEAST OREGON/SOUTHEAST WASHINGTON FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
830 PM PDT WED AUG 6 1997

SAT PIX SHOWED MARINE PUSH CROSS THE CASCADES AROUND 21Z.
CONVECTION OVER CENTRAL OR PLATEAU DECREASED AS COOLER AIR MOVED
IN.  HOWEVER...SOME CBS DID MANAGE TO POP THROUGH THE CAP AND
CONTINUE IN EASTERN CROOK AND GRANT COUNTY.  ONCE COOLER AIR MOVES
THROUGH EXPECT CBS TO DIE DOWN.  COOL AIR MAY ALSO ACT AS A
TRIGGER AS IT MOVES INTO MTNS.  WILL TONE DOWN MENTION OF BLDU TO
ZONES IN LWR BASIN.  STILL EXPECTING BREEZY WIND WITH MARINE PUSH
LATER TONIGHT AND TMRW.  CONVECTION WILL MOVE EAST OF CWA ON THU.
STUBBLEFIELD

PDT 2000  ALW 2000  PSC 0000  YKM 0000

.KPDT...OTS.

.KPDT...SVR TS IN GRANT CO. TILL 0315Z.

The office that day

Everything else NWS Pendleton, OR issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 6, 7:21 PM PDTSevere Thunderstorm WarningPDTGrant54 min
Aug 6, 7:48 PM PDTFlash Flood WarningPDTGrant57 min

Nearby

Severe Thunderstorm Warnings in Oregon, 1997Every severe thunderstorm warning in 1997

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.