Alert archive / Utah / Mesoscale Discussions in 2014

Mesoscale Discussion 1767

September 26, 2014Mohave County, Arizona; Clark County, Nevada; Iron County, Washington County, Utah

The Storm Prediction Center issued this mesoscale discussion at Sep 26, 2014, 9:34 PM MST for Mohave County, Arizona; Clark County, Nevada; Iron County, Washington County, Utah. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Sep 26, 2014, 9:34 PM MST (04:34 UTC)
Expired: Sep 27, 2014, 12:00 AM MST
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Mohave County, AZ, Clark County, NV, Iron County, UT, Washington County, UT

The radar

The Cedar City radar (KICX), 134 km from the middle of the area, began a volume at 04:36 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

Las Vegas, NV (KVEF), launched 00:00Z, 4.6 hours before the alert went out and 157 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: 333 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 2808 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 32 m²/s²
0-3 km storm-relative helicity: 25 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 27, 1:44 AM MST	Mesoscale Discussion	SPC	Mohave	2 hr
Sep 27, 3:16 AM MST	Severe Thunderstorm Watch	SPC	Coconino, Mohave, Yavapai	8 hr
Sep 27, 7:12 AM MST	Mesoscale Discussion	SPC	Coconino, Mohave, Yavapai	2 hr
Sep 27, 9:53 AM MST	Mesoscale Discussion	SPC	Coconino, Maricopa, Yavapai	67 min
Sep 27, 10:21 AM MST	Severe Thunderstorm Watch	SPC	Coconino, Gila, Maricopa, Navajo, Pinal, Yavapai	8 hr
Sep 27, 1:40 PM MST	Mesoscale Discussion	SPC	Coconino, Gila, Maricopa, Navajo, Pinal, Yavapai	2 hr
Sep 27, 4:08 PM MST	Mesoscale Discussion	SPC	Gila, Graham, Navajo, Pinal	2 hr

Nearby

Mesoscale Discussions in Utah, 2014 Mesoscale Discussions in Arizona, 2014 Mesoscale Discussions in Nevada, 2014 Every mesoscale discussion in 2014

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.