Alert archive / Nevada / Excessive Heat Warnings in 2011

Excessive Heat Warning 1, NWS Las Vegas, NV

August 22, 2011Clark County, Nye County, Nevada; Inyo County, San Bernardino County, California; Mohave County, Arizona

NWS Las Vegas, NV issued this excessive heat warning at Aug 22, 2011, 2:58 PM PDT for Clark County, Nye County, Nevada; Inyo County, San Bernardino County, California; Mohave County, Arizona. It took effect at Aug 23, 2011, 11:00 AM PDT. It was in force for 3 days. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 22, 2011, 2:58 PM PDT (21:58 UTC)
In effect from: Aug 23, 2011, 11:00 AM PDT
Expired: Aug 26, 2011, 8:00 PM PDT
In force: 3 days
Issued by: NWS Las Vegas, NV

Counties Mohave County, AZ, Inyo County, CA, San Bernardino County, CA, Clark County, NV, Nye County, NV

The radar

The Las Vegas radar (KESX), 100 km from the middle of the area, began a volume at 21:57 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, 10.0 hours before the alert went out and 376 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: 2487 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: -12 m²/s²
0-3 km storm-relative helicity: 74 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this excessive heat warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Las Vegas, NV wrote its last area forecast discussion before this excessive heat warning went out at Aug 22, 10:10 AM PDT, 4 hours 48 minutes earlier.

Area forecast discussion, Aug 22, 10:10 AM PDT, 4 hours 48 minutes before

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Hazardous weather outlook, Aug 22, 4:38 AM PDT, 10 hours 20 minutes before

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The office that day

Everything else NWS Las Vegas, NV issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 22, 2:50 AM PDT	Excessive Heat Watch	VEF	Clark, Nye	12 hr
Aug 22, 2:50 AM PDT	Excessive Heat Watch	VEF	Clark, Nye	12 hr

Nearby

Excessive Heat Warnings in Nevada, 2011 Excessive Heat Warnings in California, 2011 Excessive Heat Warnings in Arizona, 2011 Every excessive heat warning 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.