Alert archive / Idaho / Mesoscale Discussions in 2007

Mesoscale Discussion 1927

August 31, 20074 states

The Storm Prediction Center issued this mesoscale discussion at Aug 31, 2007, 8:13 PM PDT for 4 states. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued: Aug 31, 2007, 8:13 PM PDT (03:13 UTC)
Expired: Aug 31, 2007, 9:15 PM PDT
In force: 62 min
Issued by: the Storm Prediction Center

Counties Benewah County, ID, Bonner County, ID, Boundary County, ID, Clearwater County, ID, Idaho County, ID, Kootenai County, ID, Latah County, ID, Lewis County, ID, Nez Perce County, ID, Shoshone County, ID, Lincoln County, MT, Mineral County, MT, Sanders County, MT, Wallowa County, OR, Pend Oreille County, WA, Spokane County, WA, Stevens County, WA

The radar

The Spokane radar (KOTX), 119 km from the middle of the area, began a volume at 03:13 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

Spokane, WA (KOTX), launched 00:00Z, 3.2 hours before the alert went out and 75 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: 352 J/kg
Mixed-layer CIN: -66 J/kg
Mixed-layer LCL: 2199 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 83 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.5

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
Aug 31, 5:03 PM PDT	Mesoscale Discussion	SPC	Adams, Benewah, Clearwater, Latah, Lewis, Nez Perce and 3 more	87 min

Nearby

Mesoscale Discussions in Idaho, 2007 Mesoscale Discussions in Montana, 2007 Mesoscale Discussions in Washington, 2007 Every mesoscale discussion in 2007

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.