Alert archive / Utah / Mesoscale Discussions in 2004

Mesoscale Discussion 1689

July 15, 2004Mohave County, Arizona; Clark County, Lincoln County, Nevada; 9 counties in Utah

The Storm Prediction Center issued this mesoscale discussion at Jul 15, 2004, 11:39 AM MST for Mohave County, Arizona; Clark County, Lincoln County, Nevada; 9 counties in Utah. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Jul 15, 2004, 11:39 AM MST (18:39 UTC)
Expired: Jul 15, 2004, 2:15 PM MST
In force: 3 hr
Issued by: the Storm Prediction Center

Counties Mohave County, AZ, Clark County, NV, Lincoln County, NV, Beaver County, UT, Garfield County, UT, Iron County, UT, Kane County, UT, Millard County, UT, Piute County, UT, Sevier County, UT, Washington County, UT, Wayne County, UT

The radar

The Cedar City radar (KICX), 54 km from the middle of the area, began a volume at 18:42 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

Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 6.7 hours before the alert went out and 258 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: 51 J/kg
Mixed-layer CIN: -125 J/kg
Mixed-layer LCL: 1218 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 28 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 15, 11:01 AM MST	Mesoscale Discussion	SPC	Mohave	2 hr
Jul 15, 3:46 PM MST	Mesoscale Discussion	SPC	Cochise, Gila, Graham, Greenlee, Maricopa, Pima and 2 more	119 min

Nearby

Mesoscale Discussions in Utah, 2004 Mesoscale Discussions in Nevada, 2004 Mesoscale Discussions in Arizona, 2004 Every mesoscale discussion in 2004

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.