Alert archive / Idaho / Mesoscale Discussions in 2007

Mesoscale Discussion 1926

August 31, 20074 states

The Storm Prediction Center issued this mesoscale discussion at Aug 31, 2007, 6:03 PM MDT for 4 states. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued
Aug 31, 2007, 6:03 PM MDT (00:03 UTC)
Expired
Aug 31, 2007, 7:30 PM MDT
In force
87 min
Issued by
the Storm Prediction Center
All 25 counties

Adams County, ID, Benewah County, ID, Clearwater County, ID, Latah County, ID, Lewis County, ID, Nez Perce County, ID, Payette County, ID, Shoshone County, ID, Washington County, ID, Mineral County, MT, Baker County, OR, Crook County, OR, Grant County, OR, Umatilla County, OR, Union County, OR, Wallowa County, OR, Adams County, WA, Asotin County, WA, Columbia County, WA, Franklin County, WA, Garfield County, WA, Lincoln County, WA, Spokane County, WA, Walla Walla County, WA, Whitman County, WA

The radar

The Pendleton radar (KPDT), 46 km from the middle of the area, began a volume at 00:05 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, 0.1 hours before the alert went out and 302 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, Spokane, WA at 00:00Z on 2007-09-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 352 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, Spokane, WA at 00:00Z on 2007-09-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 31 square meters per square second.1939587897117Sfc1 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
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.

IssuedProductOfficeCountiesLasted
Aug 31, 9:13 PM MDTMesoscale DiscussionSPCBenewah, Bonner, Boundary, Clearwater, Idaho, Kootenai and 4 more62 min

Nearby

Mesoscale Discussions in Idaho, 2007Mesoscale Discussions in Washington, 2007Mesoscale Discussions in Oregon, 2007Every 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.