Alert archive / North Dakota / Mesoscale Discussions in 2007

Mesoscale Discussion 1897

August 26, 200720 counties in North Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 26, 2007, 3:48 PM CDT for 20 counties in North Dakota. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued
Aug 26, 2007, 3:48 PM CDT (20:48 UTC)
Expired
Aug 26, 2007, 5:15 PM CDT
In force
87 min
Issued by
the Storm Prediction Center

Counties Benson County, ND, Burleigh County, ND, Cavalier County, ND, Eddy County, ND, Foster County, ND, Grant County, ND, Griggs County, ND, Kidder County, ND, McHenry County, ND, Morton County, ND, Nelson County, ND, Oliver County, ND, Pierce County, ND, Ramsey County, ND, Rolette County, ND, Sheridan County, ND, Sioux County, ND, Towner County, ND, Walsh County, ND, Wells County, ND

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 8.8 hours before the alert went out and 124 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, Bismarck Municip, ND at 12:00Z on 2007-08-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 601 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, Bismarck Municip, ND at 12:00Z on 2007-08-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 160 square meters per square second.19395878Sfc1 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
601 J/kg
Mixed-layer CIN
-339 J/kg
Mixed-layer LCL
1256 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
160 m²/s²
0-3 km storm-relative helicity
212 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 26, 5:10 PM CDTTornado WatchSPCBarnes, Benson, Cass, Cavalier, Dickey, Eddy and 17 more8 hr

Nearby

Mesoscale Discussions in North Dakota, 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.