Alert archive / Utah / Mesoscale Discussions in 2009

Mesoscale Discussion 2014

September 14, 200911 counties in Utah

The Storm Prediction Center issued this mesoscale discussion at Sep 14, 2009, 10:08 AM MDT for 11 counties in Utah. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Sep 14, 2009, 10:08 AM MDT (16:08 UTC)
Expired: Sep 14, 2009, 12:15 PM MDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Beaver County, UT, Garfield County, UT, Iron County, UT, Juab County, UT, Millard County, UT, Piute County, UT, Sanpete County, UT, Sevier County, UT, Tooele County, UT, Utah County, UT, Wayne County, UT

The radar

The Cedar City radar (KICX), 189 km from the middle of the area, began a volume at 16:09 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 741Sep 14, 11:20 AM MDT

The nearest sounding before it

Salt Lake City I, UT (KSLC), launched 12:00Z, 4.1 hours before the alert went out and 176 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: 89 J/kg
Mixed-layer CIN: -161 J/kg
Mixed-layer LCL: 2249 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 112 m²/s²
0-3 km storm-relative helicity: 138 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
Sep 14, 11:17 AM MDT	Severe Thunderstorm Watch	SPC	Beaver, Box Elder, Cache, Carbon, Davis, Duchesne and 17 more	7 hr
Sep 14, 2:48 PM MDT	Mesoscale Discussion	SPC	Beaver, Carbon, Davis, Duchesne, Emery, Garfield and 15 more	87 min
Sep 14, 5:02 PM MDT	Mesoscale Discussion	SPC	Box Elder, Cache, Carbon, Davis, Duchesne, Emery and 10 more	58 min

Nearby

Mesoscale Discussions in Utah, 2009 Every 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.