Alert archive / Utah / Areal Flood Advisories in 2012

Areal Flood Advisory 13, NWS Salt Lake City, UT

July 31, 2012Washington County, Utah

NWS Salt Lake City, UT issued this areal flood advisory at Jul 31, 2012, 5:14 PM MDT for Washington County, Utah. It was in force for 65 min.

The area

The counties it named.

The facts

Issued: Jul 31, 2012, 5:14 PM MDT (23:14 UTC)
Expired: Jul 31, 2012, 6:19 PM MDT
In force: 65 min
Issued by: NWS Salt Lake City, UT
Area: Storm-based polygon

County Washington County, UT

The radar

The Cedar City radar (KICX), 66 km from the middle of the area, began a volume at 23:17 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, 11.2 hours before the alert went out and 274 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: 209 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 818 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -17 m²/s²
0-3 km storm-relative helicity: 121 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 areal flood advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Salt Lake City, UT wrote its last area forecast discussion before this areal flood advisory went out at Jul 31, 4:03 PM MDT, 1 hour 11 minutes earlier.

Area forecast discussion, Jul 31, 4:03 PM MDT, 1 hour 11 minutes before

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Hazardous weather outlook, Jul 31, 6:20 AM MDT, 10 hours 54 minutes before

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In the hours before

Local storm report, Jul 31, 5:02 PM MDT, 12 minutes before

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The office that day

Everything else NWS Salt Lake City, UT issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 31, 3:35 AM MDT	Flash Flood Watch	SLC		18 hr
Jul 31, 1:55 PM MDT	Flash Flood Warning	SLC	Carbon, Emery	4 hr
Jul 31, 3:00 PM MDT	Flash Flood Warning	SLC	Wayne	4 hr
Jul 31, 5:25 PM MDT	Flash Flood Warning	SLC	Kane, Washington	4 hr

Nearby

Areal Flood Advisories in Utah, 2012 Every areal flood advisory in 2012

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.