Alert archive / Washington / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 526

July 24, 20024 states

The Storm Prediction Center issued this severe thunderstorm watch at Jul 24, 2002, 3:30 PM PDT for 4 states. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jul 24, 2002, 3:30 PM PDT (22:30 UTC)
Expired
Jul 24, 2002, 9:00 PM PDT
In force
6 hr
Issued by
the Storm Prediction Center
All 21 counties

Benewah County, ID, Clearwater County, ID, Idaho County, ID, Latah County, ID, Lewis County, ID, Nez Perce County, ID, Shoshone County, ID, Mineral County, MT, Morrow County, OR, Umatilla County, OR, Union County, OR, Wallowa County, OR, Adams County, WA, Asotin County, WA, Benton County, WA, Columbia County, WA, Franklin County, WA, Garfield County, WA, Grant County, WA, Walla Walla County, WA, Whitman County, WA

The radar

The Pendleton radar (KPDT), 115 km from the middle of the area, began a volume at 22:32 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.

Warnings issued inside it

4 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Jul 24, 4:33 PM PDTSevere Thunderstorm WarningPDTWallowa42 min
Jul 24, 4:37 PM PDTSevere Thunderstorm WarningPDTWallowa38 min
Jul 24, 4:41 PM PDTSevere Thunderstorm WarningPDTUnion49 min
Jul 24, 6:09 PM PDTSevere Thunderstorm WarningOTXLatah36 min

The nearest sounding before it

Boise Airport, ID (KBOI), launched 12:00Z, 10.5 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, Boise Airport, ID at 12:00Z on 2002-07-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3 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 12:00Z on 2002-07-24The 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
3 J/kg
Mixed-layer CIN
-537 J/kg
Mixed-layer LCL
2826 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
-27 m²/s²
0-3 km storm-relative helicity
100 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

Nearby

Severe Thunderstorm Watches in Washington, 2002Severe Thunderstorm Watches in Idaho, 2002Severe Thunderstorm Watches in Oregon, 2002Every severe thunderstorm watch 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.