Alert archive / North Dakota / Mesoscale Discussions in 2003

Mesoscale Discussion 2123

August 8, 20035 counties in Montana; 8 counties in North Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 8, 2003, 1:48 PM MDT for 5 counties in Montana; 8 counties in North Dakota. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued: Aug 8, 2003, 1:48 PM MDT (19:48 UTC)
Expired: Aug 8, 2003, 3:45 PM MDT
In force: 117 min
Issued by: the Storm Prediction Center

Counties Dawson County, MT, Richland County, MT, Roosevelt County, MT, Sheridan County, MT, Wibaux County, MT, Billings County, ND, Burke County, ND, Divide County, ND, Golden Valley County, ND, McKenzie County, ND, Mountrail County, ND, Renville County, ND, Williams County, ND

The radar

The Glasgow radar (KGGW), 203 km from the middle of the area, began a volume at 19:52 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 watches that followed

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

Severe Thunderstorm Watch 851Aug 8, 3:40 PM MDT

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 7.8 hours before the alert went out and 275 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: 336 J/kg
Mixed-layer CIN: -383 J/kg
Mixed-layer LCL: 1081 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 191 m²/s²
0-3 km storm-relative helicity: 217 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.6

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 7, 9:11 PM MDT	Mesoscale Discussion	SPC	Blaine, Daniels, Dawson, Garfield, Hill, McCone and 7 more	64 min
Aug 8, 3:40 PM MDT	Severe Thunderstorm Watch	SPC	Dawson, Richland, Roosevelt, Sheridan, Wibaux	6 hr
Aug 8, 4:35 PM MDT	Severe Thunderstorm Watch	SPC	Fergus, Garfield, Golden Valley, McCone, Musselshell, Petroleum and 1 more	5 hr

Nearby

Mesoscale Discussions in North Dakota, 2003 Mesoscale Discussions in Montana, 2003 Every mesoscale discussion in 2003

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.