Alert archive / Georgia / Heat Advisories in 2021

Heat Advisory 1, NWS Jacksonville, FL

July 29, 20214 counties in Florida; 14 counties in Georgia

NWS Jacksonville, FL issued this heat advisory at Jul 29, 2021, 8:34 PM EDT for 4 counties in Florida; 14 counties in Georgia. It took effect at Jul 30, 2021, 11:00 AM EDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: Jul 29, 2021, 8:34 PM EDT (00:34 UTC)
In effect from: Jul 30, 2021, 11:00 AM EDT
Expired: Jul 30, 2021, 7:00 PM EDT
In force: 8 hr
Issued by: NWS Jacksonville, FL

Counties Baker County, FL, Duval County, FL, Nassau County, FL, Suwannee County, FL, Appling County, GA, Atkinson County, GA, Bacon County, GA, Brantley County, GA, Camden County, GA, Charlton County, GA, Clinch County, GA, Coffee County, GA, Echols County, GA, Glynn County, GA, Jeff Davis County, GA, Pierce County, GA, Ware County, GA, Wayne County, GA

The radar

The Moody AFB radar (KVAX), 71 km from the middle of the area, began a volume at 00:36 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

Charleston AFB, SC (KCHS), launched 00:00Z, 0.6 hours before the alert went out and 297 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: 2173 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 957 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 63 m²/s²
0-3 km storm-relative helicity: 97 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 Jacksonville, FL wrote its last area forecast discussion before this heat advisory went out at Jul 29, 7:35 PM EDT, 59 minutes earlier.

Area forecast discussion, Jul 29, 7:35 PM EDT, 59 minutes before

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In the hours before

Special weather statement, Jul 29, 3:19 PM EDT, 5 hours 15 minutes before

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Special weather statement, Jul 29, 3:55 PM EDT, 4 hours 39 minutes before

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Special weather statement, Jul 29, 4:32 PM EDT, 4 hours 2 minutes before

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Special weather statement, Jul 29, 4:56 PM EDT, 3 hours 38 minutes before

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Special weather statement, Jul 29, 5:48 PM EDT, 2 hours 46 minutes before

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Special weather statement, Jul 29, 7:00 PM EDT, 1 hour 34 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 30, 5:56 PM EDT	Special Weather Statement	JAX	Alachua	49 min

Nearby

Heat Advisories in Georgia, 2021 Heat Advisories in Florida, 2021 Every heat 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; radar from the NEXRAD Level II archive.