Alert archive / Oregon / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 38, NWS Boise, ID

August 18, 2020Malheur County, Oregon

NWS Boise, ID issued this severe thunderstorm warning at Aug 18, 2020, 5:34 PM MDT for Malheur County, Oregon. It was in force for 41 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
Aug 18, 2020, 5:34 PM MDT (23:34 UTC)
Expired
Aug 18, 2020, 6:15 PM MDT
In force
41 min
Issued by
NWS Boise, ID
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Malheur County, OR

The radar

The Boise radar (KCBX), 117 km from the middle of the area, began a volume at 23:33 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

Reno, NV (KREV), launched 12:00Z, 11.6 hours before the alert went out and 406 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, Reno, NV at 12:00Z on 2020-08-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 6 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, Reno, NV at 12:00Z on 2020-08-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 76 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
6 J/kg
Mixed-layer CIN
-502 J/kg
Mixed-layer LCL
2227 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
76 m²/s²
0-3 km storm-relative helicity
119 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

Everything else NWS Boise, ID issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 17, 6:51 PM MDTSevere Thunderstorm WarningBOIAdams, Valley, Washington39 min
Aug 17, 7:20 PM MDTSevere Thunderstorm WarningBOIAdams, Valley25 min
Aug 18, 12:58 PM MDTRed Flag WarningBOIIdaho, Owyhee, Valley34 hr
Aug 18, 5:00 PM MDTSpecial Weather StatementBOI45 min
Aug 18, 5:25 PM MDTSpecial Weather StatementBOITwin Falls50 min
Aug 18, 5:55 PM MDTSpecial Weather StatementBOIOwyhee50 min
Aug 18, 3:52 PM MDTSpecial Weather StatementBOIHarney38 min
Aug 18, 4:31 PM MDTSevere Thunderstorm WarningBOIHarney, Malheur44 min
Aug 18, 5:16 PM MDTSpecial Weather StatementBOIMalheur44 min
Aug 18, 5:44 PM MDTSpecial Weather StatementBOIMalheur46 min

Nearby

Severe Thunderstorm Warnings in Oregon, 2020Every severe thunderstorm warning in 2020

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.