Alert archive / Texas / Frost Advisories in 2011

Frost Advisory 1, NWS San Angelo, TX

May 2, 201124 counties in Texas

NWS San Angelo, TX issued this frost advisory at May 2, 2011, 3:51 PM CDT for 24 counties in Texas. It took effect at May 3, 2011, 3:00 AM CDT. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued: May 2, 2011, 3:51 PM CDT (20:51 UTC)
In effect from: May 3, 2011, 3:00 AM CDT
Expired: May 3, 2011, 9:12 AM CDT
In force: 6 hr
Issued by: NWS San Angelo, TX

All 24 counties

Brown County, TX, Callahan County, TX, Coke County, TX, Coleman County, TX, Concho County, TX, Crockett County, TX, Fisher County, TX, Haskell County, TX, Irion County, TX, Jones County, TX, Kimble County, TX, Mason County, TX, McCulloch County, TX, Menard County, TX, Nolan County, TX, Runnels County, TX, San Saba County, TX, Schleicher County, TX, Shackelford County, TX, Sterling County, TX, Sutton County, TX, Taylor County, TX, Throckmorton County, TX, Tom Green County, TX

The radar

The San Angelo radar (KSJT), 63 km from the middle of the area, began a volume at 20:57 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

Midland Regional, TX (KMAF), launched 12:00Z, 8.9 hours before the alert went out and 213 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: 1768 m above ground
0-6 km bulk shear: 85 kt
0-1 km storm-relative helicity: -128 m²/s²
0-3 km storm-relative helicity: -51 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 frost advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS San Angelo, TX wrote its last area forecast discussion before this frost advisory went out at May 2, 3:22 PM CDT, 29 minutes earlier.

Area forecast discussion, May 2, 3:22 PM CDT, 29 minutes before

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Hazardous weather outlook, May 2, 2:46 PM CDT, 1 hour 5 minutes before

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The office that day

Everything else NWS San Angelo, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 1, 11:59 PM CDT	Severe Thunderstorm Warning	SJT	Brown	29 min
May 2, 12:35 AM CDT	Severe Thunderstorm Warning	SJT	Callahan, Shackelford	40 min
May 2, 2:05 AM CDT	Severe Thunderstorm Warning	SJT	Brown, San Saba	40 min
May 2, 2:27 AM CDT	Severe Thunderstorm Warning	SJT	Taylor	21 min

Nearby

Frost Advisories in Texas, 2011 Every frost advisory 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.