Alert archive / Washington / Flash Flood Warnings in 1998

Flash Flood Warning 15, NWS Pendleton, OR

July 29, 1998Kittitas County, Washington

NWS Pendleton, OR issued this flash flood warning at Jul 29, 1998, 6:38 PM PDT for Kittitas County, Washington. It was in force for 87 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 29, 1998, 6:38 PM PDT (01:38 UTC)
Expired
Jul 29, 1998, 8:05 PM PDT
In force
87 min
Issued by
NWS Pendleton, OR
Area
Whole counties

County Kittitas County, WA

The radar

The Seattle radar (KATX), 181 km from the middle of the area, began a volume at 01:40 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 00:00Z, 1.6 hours before the alert went out and 328 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 00:00Z on 1998-07-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1429 joules per kilogram.LCLEL10008507005003002001001 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 00:00Z on 1998-07-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -10 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
1429 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
2418 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
-10 m²/s²
0-3 km storm-relative helicity
29 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 29, 6:05 PM PDTSevere Thunderstorm WarningPDTWasco65 min
Jul 30, 2:41 PM PDTSevere Thunderstorm WarningPDTGrant29 min
Jul 30, 3:48 PM PDTSevere Thunderstorm WarningPDTDeschutes32 min
Jul 29, 5:40 PM PDTFlash Flood WarningPDTKittitas60 min

Nearby

Flash Flood Warnings in Washington, 1998Every flash flood 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.