Alert archive / Washington / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 33, NWS Pendleton, OR

July 21, 1997Columbia County, Walla Walla County, Washington

NWS Pendleton, OR issued this severe thunderstorm warning at Jul 21, 1997, 2:07 PM PDT for Columbia County, Walla Walla County, Washington. It was in force for 68 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 21, 1997, 2:07 PM PDT (21:07 UTC)
Expired
Jul 21, 1997, 3:15 PM PDT
In force
68 min
Issued by
NWS Pendleton, OR
Area
Whole counties

Counties Columbia County, WA, Walla Walla County, WA

The radar

The Pendleton radar (KPDT), 82 km from the middle of the area, began a volume at 21:08 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

Spokane, WA (KOTX), launched 12:00Z, 9.1 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.

Skew-T log-pSkew-T log-p diagram, Spokane, WA at 12:00Z on 1997-07-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 429 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, Spokane, WA at 12:00Z on 1997-07-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 4 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
429 J/kg
Mixed-layer CIN
-207 J/kg
Mixed-layer LCL
1624 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
4 m²/s²
0-3 km storm-relative helicity
78 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.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 21, 1:06 PM PDTSevere Thunderstorm WarningPDTUmatilla, Union69 min
Jul 21, 2:07 PM PDTSevere Thunderstorm WarningPDTUnion, Wallowa68 min
Jul 21, 4:11 PM PDTSevere Thunderstorm WarningPDTWallowa64 min
Jul 21, 4:54 PM PDTSevere Thunderstorm WarningPDTUnion, Wallowa66 min

Nearby

Severe Thunderstorm Warnings in Washington, 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; radar from the NEXRAD Level II archive.