Alert archive / Oregon / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 9, NWS Pendleton, OR

September 11, 2025Union County, Wallowa County, Oregon

NWS Pendleton, OR issued this severe thunderstorm warning at Sep 11, 2025, 5:42 PM PDT for Union County, Wallowa County, Oregon. It was in force for 18 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
Sep 11, 2025, 5:42 PM PDT (00:42 UTC)
Expired
Sep 11, 2025, 6:00 PM PDT
In force
18 min
Issued by
NWS Pendleton, OR
Area
Storm-based polygon
Hail
1.5 in
Wind
50.0 mph

Counties Union County, OR, Wallowa County, OR

The radar

The Pendleton radar (KPDT), 102 km from the middle of the area, began a volume at 00:42 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

Boise Airport, ID (KBOI), launched 00:00Z, 0.7 hours before the alert went out and 236 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 00:00Z on 2025-09-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 40 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 00:00Z on 2025-09-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -1 square meters per square second.1939Sfc1 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
40 J/kg
Mixed-layer CIN
-78 J/kg
Mixed-layer LCL
2069 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
-1 m²/s²
0-3 km storm-relative helicity
11 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 11, 5:14 PM PDTSpecial Weather StatementPDTUnion31 min
Sep 11, 5:31 PM PDTSpecial Weather StatementPDTWallowa29 min
Sep 11, 6:11 PM PDTSpecial Weather StatementPDTWallowa34 min
Sep 11, 7:31 PM PDTSpecial Weather StatementPDTUmatilla29 min
Sep 11, 8:43 PM PDTAreal Flood AdvisoryPDTWallowa3 hr
Sep 11, 7:21 PM PDTSpecial Weather StatementPDTColumbia24 min
Sep 11, 8:00 PM PDTSpecial Weather StatementPDTColumbia30 min

Nearby

Severe Thunderstorm Warnings in Oregon, 2025Every severe thunderstorm warning in 2025

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.