Alert archive / Idaho / Mesoscale Discussions in 2012

Mesoscale Discussion 1470

July 14, 201213 counties in Idaho; 5 counties in Oregon; 4 counties in Washington

The Storm Prediction Center issued this mesoscale discussion at Jul 14, 2012, 10:33 PM MDT for 13 counties in Idaho; 5 counties in Oregon; 4 counties in Washington. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued: Jul 14, 2012, 10:33 PM MDT (04:33 UTC)
Expired: Jul 14, 2012, 11:30 PM MDT
In force: 57 min
Issued by: the Storm Prediction Center

All 22 counties

Adams County, ID, Boise County, ID, Clearwater County, ID, Gem County, ID, Idaho County, ID, Latah County, ID, Lemhi County, ID, Lewis County, ID, Nez Perce County, ID, Payette County, ID, Shoshone County, ID, Valley County, ID, Washington County, ID, Baker County, OR, Grant County, OR, Umatilla County, OR, Union County, OR, Wallowa County, OR, Asotin County, WA, Columbia County, WA, Garfield County, WA, Walla Walla County, WA

The radar

The Pendleton radar (KPDT), 163 km from the middle of the area, began a volume at 04:34 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, 4.6 hours before the alert went out and 228 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 224 J/kg
Mixed-layer CIN: -25 J/kg
Mixed-layer LCL: 3060 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 91 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 14, 6:23 PM MDT	Mesoscale Discussion	SPC	Ada, Adams, Boise, Camas, Canyon, Clearwater and 12 more	67 min

Nearby

Mesoscale Discussions in Idaho, 2012 Mesoscale Discussions in Oregon, 2012 Mesoscale Discussions in Washington, 2012 Every mesoscale discussion in 2012

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.