Alert archive / Louisiana / Heat Advisories in 2012

Heat Advisory 4, NWS Shreveport, LA

July 31, 20127 parishes in Louisiana

NWS Shreveport, LA issued this heat advisory at Jul 31, 2012, 4:25 AM CDT for 7 parishes in Louisiana. It took effect at Jul 31, 2012, 4:00 PM CDT. It was in force for 51 hr.

The area

The counties it named.

The facts

Issued: Jul 31, 2012, 4:25 AM CDT (09:25 UTC)
In effect from: Jul 31, 2012, 4:00 PM CDT
Expired: Aug 2, 2012, 7:00 PM CDT
In force: 51 hr
Issued by: NWS Shreveport, LA

Counties Caldwell Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Winn Parish, LA

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 9.4 hours before the alert went out and 218 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: 2680 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 1165 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 54 m²/s²
0-3 km storm-relative helicity: 50 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.4

Open this sounding in Storm Lab

What forecasters said that day

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

NWS Shreveport, LA wrote its last area forecast discussion before this heat advisory went out at Jul 31, 3:52 AM CDT, 33 minutes earlier.

Area forecast discussion, Jul 31, 3:52 AM CDT, 33 minutes before

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The office that day

Everything else NWS Shreveport, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 30, 8:12 PM CDT	Excessive Heat Warning	SHV	Caldwell, Grant, Jackson, LaSalle, Natchitoches, Ouachita and 1 more	20 hr

Nearby

Heat Advisories in Louisiana, 2012 Every heat 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.