Alert archive / Florida / Heat Advisories in 2015

Heat Advisory 4, NWS Tallahassee, FL

July 11, 201514 counties in Florida; 4 counties in Georgia; 5 counties in Alabama

NWS Tallahassee, FL issued this heat advisory at Jul 11, 2015, 2:34 PM CDT for 14 counties in Florida; 4 counties in Georgia; 5 counties in Alabama. It took effect at Jul 12, 2015, 10:00 AM CDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: Jul 11, 2015, 2:34 PM CDT (19:34 UTC)
In effect from: Jul 12, 2015, 10:00 AM CDT
Expired: Jul 12, 2015, 6:00 PM CDT
In force: 8 hr
Issued by: NWS Tallahassee, FL

All 23 counties

Coffee County, AL, Dale County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Bay County, FL, Calhoun County, FL, Dixie County, FL, Franklin County, FL, Gadsden County, FL, Gulf County, FL, Holmes County, FL, Jackson County, FL, Jefferson County, FL, Leon County, FL, Taylor County, FL, Wakulla County, FL, Walton County, FL, Washington County, FL, Decatur County, GA, Early County, GA, Miller County, GA, Seminole County, GA

The radar

The Tallahassee radar (KTLH), 70 km from the middle of the area, began a volume at 19:37 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

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 7.6 hours before the alert went out and 73 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: 465 J/kg
Mixed-layer CIN: -80 J/kg
Mixed-layer LCL: 1400 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: -24 m²/s²
0-3 km storm-relative helicity: -13 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 heat advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Tallahassee, FL wrote its last area forecast discussion before this heat advisory went out at Jul 11, 9:14 AM CDT, 5 hours 20 minutes earlier.

Area forecast discussion, Jul 11, 9:14 AM CDT, 5 hours 20 minutes before

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The office that day

Everything else NWS Tallahassee, FL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 11, 1:24 AM CDT	Heat Advisory	TAE	Calhoun, Franklin, Gadsden, Jackson, Leon, Wakulla	18 hr
Jul 11, 4:57 PM CDT	Severe Thunderstorm Warning	TAE	Dixie	23 min

Nearby

Heat Advisories in Florida, 2015 Heat Advisories in Alabama, 2015 Heat Advisories in Georgia, 2015 Every heat advisory in 2015

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.