Alert archive / North Dakota / Mesoscale Discussions in 2009

Mesoscale Discussion 2008

September 10, 200912 counties in North Dakota

The Storm Prediction Center issued this mesoscale discussion at Sep 10, 2009, 11:45 PM CDT for 12 counties in North Dakota. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued
Sep 10, 2009, 11:45 PM CDT (04:45 UTC)
Expired
Sep 11, 2009, 1:15 AM CDT
In force
90 min
Issued by
the Storm Prediction Center

Counties Benson County, ND, Burleigh County, ND, Emmons County, ND, Grant County, ND, Kidder County, ND, Morton County, ND, Oliver County, ND, Pierce County, ND, Sheridan County, ND, Sioux County, ND, Towner County, ND, Wells County, ND

The radar

The Bismarck radar (KBIS), 83 km from the middle of the area, began a volume at 04:49 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

Bismarck Municip, ND (KBIS), launched 00:00Z, 4.8 hours before the alert went out and 81 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 2009-09-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2131 joules per kilogram.LCLEL10008507005003002001001 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 2009-09-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 83 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
2131 J/kg
Mixed-layer CIN
-15 J/kg
Mixed-layer LCL
1947 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
83 m²/s²
0-3 km storm-relative helicity
87 m²/s²
Significant tornado parameter
0.1
Supercell composite
6.0

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.

IssuedProductOfficeCountiesLasted
Sep 10, 7:29 PM CDTSevere Thunderstorm WatchSPCBenson, Burleigh, Cavalier, Dickey, Eddy, Emmons and 21 more7 hr
Sep 10, 10:28 PM CDTMesoscale DiscussionSPCBenson, Burleigh, Emmons, Grant, Kidder, Morton and 6 more92 min

Nearby

Mesoscale Discussions in North Dakota, 2009Every mesoscale discussion in 2009

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.