Alert archive / Washington / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 9, NWS Pendleton, OR

April 23, 1998Franklin County, Washington

NWS Pendleton, OR issued this severe thunderstorm warning at Apr 23, 1998, 2:17 PM PDT for Franklin County, Washington. It was in force for 63 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
Apr 23, 1998, 2:17 PM PDT (21:17 UTC)
Expired
Apr 23, 1998, 3:20 PM PDT
In force
63 min
Issued by
NWS Pendleton, OR
Area
Whole counties

County Franklin County, WA

The radar

The Pendleton radar (KPDT), 94 km from the middle of the area, began a volume at 21:18 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Apr 23, 11:30 AM PDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Spokane, WA (KOTX), launched 12:00Z, 9.3 hours before the alert went out and 229 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 1998-04-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 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 1998-04-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 27 square meters per square second.19395878Sfc1 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
1 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1569 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
27 m²/s²
0-3 km storm-relative helicity
91 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
Apr 23, 10:35 AM PDTSevere Thunderstorm WarningPDTCrook, Jefferson, Wheeler60 min
Apr 23, 12:49 PM PDTSevere Thunderstorm WarningPDTUnion61 min
Apr 23, 1:07 PM PDTSevere Thunderstorm WarningPDTUmatilla63 min
Apr 23, 1:35 PM PDTSevere Thunderstorm WarningPDTWalla Walla65 min
Apr 23, 2:33 PM PDTSevere Thunderstorm WarningPDTColumbia, Walla Walla62 min

Nearby

Severe Thunderstorm Warnings in Washington, 1998Every severe thunderstorm warning in 1998

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.