Alert archive / Wyoming / Mesoscale Discussions in 2007

Mesoscale Discussion 1796

August 18, 20077 counties in Utah; 8 counties in Wyoming

The Storm Prediction Center issued this mesoscale discussion at Aug 18, 2007, 9:16 PM MDT for 7 counties in Utah; 8 counties in Wyoming. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued: Aug 18, 2007, 9:16 PM MDT (03:16 UTC)
Expired: Aug 18, 2007, 10:15 PM MDT
In force: 59 min
Issued by: the Storm Prediction Center

Counties Cache County, UT, Davis County, UT, Morgan County, UT, Rich County, UT, Salt Lake County, UT, Summit County, UT, Weber County, UT, Fremont County, WY, Johnson County, WY, Lincoln County, WY, Natrona County, WY, Sublette County, WY, Sweetwater County, WY, Uinta County, WY, Washakie County, WY

The radar

The Riverton/Lander radar (KRIW), 78 km from the middle of the area, began a volume at 03:18 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

Riverton, WY (KRIW), launched 00:00Z, 3.3 hours before the alert went out and 82 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: 3390 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 8 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
Aug 19, 12:31 PM MDT	Mesoscale Discussion	SPC	Lincoln, Park, Sublette, Teton	119 min
Aug 19, 1:36 PM MDT	Severe Thunderstorm Watch	SPC	Big Horn, Fremont, Hot Springs, Lincoln, Park, Sublette and 3 more	6 hr
Aug 19, 5:01 PM MDT	Mesoscale Discussion	SPC	Campbell, Converse, Crook, Johnson, Natrona, Niobrara and 2 more	89 min
Aug 19, 5:30 PM MDT	Severe Thunderstorm Watch	SPC	Campbell, Converse, Crook, Goshen, Johnson, Natrona and 4 more	5 hr

Nearby

Mesoscale Discussions in Wyoming, 2007 Mesoscale Discussions in Utah, 2007 Every 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; radar from the NEXRAD Level II archive.