Alert archive / Texas / Areal Flood Advisories in 2021

Areal Flood Advisory 142, NWS Austin/San Antonio, TX

June 27, 2021Williamson County, Texas

NWS Austin/San Antonio, TX issued this areal flood advisory at Jun 27, 2021, 5:19 PM CDT for Williamson County, Texas. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: Jun 27, 2021, 5:19 PM CDT (22:19 UTC)
Expired: Jun 27, 2021, 8:30 PM CDT
In force: 3 hr
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon

County Williamson County, TX

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 10.3 hours before the alert went out and 245 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: 817 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 772 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 11 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 Austin/San Antonio, TX wrote its last area forecast discussion before this areal flood advisory went out at Jun 27, 2:16 PM CDT, 3 hours 3 minutes earlier.

Area forecast discussion, Jun 27, 2:16 PM CDT, 3 hours 3 minutes before

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Hazardous weather outlook, Jun 27, 3:18 AM CDT, 14 hours 1 minute before

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      <h1 id="headline">This service is currently unavailable.</h1>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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        Please try again in a few minutes.
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Nearby

Areal Flood Advisories in Texas, 2021 Every areal flood advisory in 2021

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.