Alert archive / North Dakota / Mesoscale Discussions in 2006

Mesoscale Discussion 1680

July 30, 2006Sheridan County, Montana; Burke County, Divide County, Williams County, North Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 30, 2006, 6:09 PM MDT for Sheridan County, Montana; Burke County, Divide County, Williams County, North Dakota. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued
Jul 30, 2006, 6:09 PM MDT (00:09 UTC)
Expired
Jul 30, 2006, 7:45 PM MDT
In force
96 min
Issued by
the Storm Prediction Center

Counties Sheridan County, MT, Burke County, ND, Divide County, ND, Williams County, ND

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 0.2 hours before the alert went out and 285 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 00:00Z on 2006-07-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 629 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 00:00Z on 2006-07-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 39 square meters per square second.193958Sfc1 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
629 J/kg
Mixed-layer CIN
-17 J/kg
Mixed-layer LCL
4054 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
39 m²/s²
0-3 km storm-relative helicity
30 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

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
Jul 30, 7:57 PM MDTMesoscale DiscussionSPCBenson, Cavalier, Eddy, Grand Forks, McHenry, McLean and 11 more2 hr
Jul 30, 10:38 PM MDTSevere Thunderstorm WatchSPCCavalier, Pembina, Ramsey, Walsh4 hr
Jul 31, 12:12 PM MDTMesoscale DiscussionSPCCass, Ransom, Richland, Sargent2 hr

Nearby

Mesoscale Discussions in North Dakota, 2006Mesoscale Discussions in Montana, 2006Every mesoscale discussion in 2006

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.