Alert archive / Nevada / Mesoscale Discussions in 2011

Mesoscale Discussion 2160

September 11, 2011Coconino County, Arizona; Clark County, Lincoln County, Nevada; Kane County, Washington County, Utah

The Storm Prediction Center issued this mesoscale discussion at Sep 11, 2011, 3:30 PM MST for Coconino County, Arizona; Clark County, Lincoln County, Nevada; Kane County, Washington County, Utah. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
Sep 11, 2011, 3:30 PM MST (22:30 UTC)
Expired
Sep 11, 2011, 6:00 PM MST
In force
3 hr
Issued by
the Storm Prediction Center

Counties Coconino County, AZ, Clark County, NV, Lincoln County, NV, Kane County, UT, Washington County, UT

The radar

The Cedar City radar (KICX), 140 km from the middle of the area, began a volume at 22:32 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, 10.5 hours before the alert went out and 184 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-pSkew-T log-p diagram, Flgstf/Belemont, AZ at 12:00Z on 2011-09-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 68 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Flgstf/Belemont, AZ at 12:00Z on 2011-09-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 128 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
68 J/kg
Mixed-layer CIN
-66 J/kg
Mixed-layer LCL
1200 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
128 m²/s²
0-3 km storm-relative helicity
178 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.

IssuedProductOfficeCountiesLasted
Sep 11, 2:47 PM MSTMesoscale DiscussionSPCGila, Maricopa, Pinal, Yavapai2 hr

Nearby

Mesoscale Discussions in Nevada, 2011Mesoscale Discussions in Utah, 2011Mesoscale Discussions in Arizona, 2011Every mesoscale discussion in 2011

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.