Alert archive / Idaho / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 49, NWS Boise, ID

August 21, 2010Boise County, Idaho

NWS Boise, ID issued this severe thunderstorm warning at Aug 21, 2010, 9:59 PM MDT for Boise County, Idaho. It was in force for 61 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 21, 2010, 9:59 PM MDT (03:59 UTC)
Expired
Aug 21, 2010, 11:00 PM MDT
In force
61 min
Issued by
NWS Boise, ID
Area
Storm-based polygon

County Boise County, ID

The radar

The Boise radar (KCBX), 69 km from the middle of the area, began a volume at 04:00 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

Elko, NV (KLKN), launched 00:00Z, 4.0 hours before the alert went out and 369 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, Elko, NV at 00:00Z on 2010-08-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 262 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, Elko, NV at 00:00Z on 2010-08-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -15 square meters per square second.1939587897Sfc1 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
262 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
3366 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
-15 m²/s²
0-3 km storm-relative helicity
31 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 21, 6:35 PM MDTSpecial Weather StatementBOIAda40 min
Aug 21, 8:23 PM MDTSpecial Weather StatementBOIAda67 min
Aug 21, 8:56 PM MDTSevere Thunderstorm WarningBOIAda49 min
Aug 21, 9:41 PM MDTSevere Thunderstorm WarningBOIAda, Canyon, Owyhee64 min
Aug 21, 11:10 PM MDTSpecial Weather StatementBOIAda, Boise, Canyon, Elmore, Gem, Owyhee and 2 more50 min
Aug 22, 12:20 AM MDTSpecial Weather StatementBOIAda, Owyhee85 min
Aug 22, 3:02 AM MDTWind AdvisoryBOIGooding, Jerome, Owyhee, Twin Falls7 hr
Aug 22, 3:46 AM MDTRed Flag WarningBOI14 hr

Nearby

Severe Thunderstorm Warnings in Idaho, 2010Every severe thunderstorm warning in 2010

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.