Alert archive / Montana / Mesoscale Discussions in 2003

Mesoscale Discussion 1714

July 8, 200313 counties in Montana

The Storm Prediction Center issued this mesoscale discussion at Jul 8, 2003, 2:33 PM MDT for 13 counties in Montana. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued: Jul 8, 2003, 2:33 PM MDT (20:33 UTC)
Expired: Jul 8, 2003, 3:30 PM MDT
In force: 57 min
Issued by: the Storm Prediction Center

Counties Big Horn County, MT, Blaine County, MT, Carbon County, MT, Fergus County, MT, Garfield County, MT, Golden Valley County, MT, Musselshell County, MT, Petroleum County, MT, Phillips County, MT, Stillwater County, MT, Treasure County, MT, Valley County, MT, Yellowstone County, MT

The radar

The Billings radar (KBLX), 92 km from the middle of the area, began a volume at 20:34 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 689Jul 8, 6:00 PM MDT

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 12:00Z, 8.6 hours before the alert went out and 215 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1591 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 147 m²/s²
0-3 km storm-relative helicity: 263 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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.

Issued	Product	Office	Counties	Lasted
Jul 8, 10:53 AM MDT	Mesoscale Discussion	SPC	Custer, Fergus, Garfield, Golden Valley, Judith Basin, McCone and 10 more	2 hr
Jul 8, 12:00 PM MDT	Severe Thunderstorm Watch	SPC	Big Horn, Blaine, Carbon, Fergus, Garfield, Golden Valley and 7 more	6 hr
Jul 8, 1:36 PM MDT	Mesoscale Discussion	SPC	Carter, Custer, Fallon, Powder River	84 min
Jul 8, 2:05 PM MDT	Tornado Watch	SPC	Carter, Custer, Fallon, Powder River	7 hr
Jul 8, 4:38 PM MDT	Mesoscale Discussion	SPC	Carter, Custer, Fallon, Powder River	67 min
Jul 8, 5:46 PM MDT	Mesoscale Discussion	SPC	Blaine, Daniels, Dawson, Garfield, McCone, Petroleum and 9 more	59 min

Nearby

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.