Alert archive / Florida / Dense Fog Advisories in 2021

Dense Fog Advisory 35, NWS Tallahassee, FL

December 30, 20215 counties in Florida

NWS Tallahassee, FL issued this dense fog advisory at Dec 30, 2021, 8:15 AM EST for 5 counties in Florida. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued: Dec 30, 2021, 8:15 AM EST (13:15 UTC)
Expired: Dec 30, 2021, 12:00 PM EST
In force: 4 hr
Issued by: NWS Tallahassee, FL

Counties Dixie County, FL, Franklin County, FL, Jefferson County, FL, Taylor County, FL, Wakulla County, FL

The radar

The Tallahassee radar (KTLH), 56 km from the middle of the area, began a volume at 13:16 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, 1.3 hours before the alert went out and 55 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: 850 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 526 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 175 m²/s²
0-3 km storm-relative helicity: 186 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 3.9

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this dense fog 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 dense fog advisory went out at Dec 30, 6:59 AM EST, 1 hour 16 minutes earlier.

Area forecast discussion, Dec 30, 6:59 AM EST, 1 hour 16 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
Dec 30, 8:16 AM EST	Marine Dense Fog Advisory	TAE		6 hr
Dec 30, 11:16 AM EST	Special Weather Statement	TAE	Jackson	29 min
Dec 30, 11:41 AM EST	Special Weather Statement	TAE	Jackson	34 min
Dec 30, 2:46 PM EST	Marine Dense Fog Advisory	TAE		43 hr
Dec 30, 12:10 PM EST	Special Weather Statement	TAE	Seminole	35 min
Dec 30, 12:42 PM EST	Special Weather Statement	TAE	Seminole	48 min
Dec 30, 1:30 PM EST	Special Weather Statement	TAE	Worth	45 min
Dec 30, 1:31 PM EST	Special Weather Statement	TAE	Turner	44 min
Dec 30, 1:34 PM EST	Tornado Warning	TAE	Turner	26 min
Dec 30, 1:54 PM EST	Special Weather Statement	TAE	Dougherty	51 min
Dec 30, 1:57 PM EST	Special Weather Statement	TAE	Irwin	48 min
Dec 30, 2:06 PM EST	Special Weather Statement	TAE	Mitchell	39 min
Dec 30, 2:34 PM EST	Special Weather Statement	TAE	Colquitt	41 min
Dec 30, 3:02 PM EST	Severe Thunderstorm Warning	TAE	Colquitt, Cook	58 min
Dec 30, 3:04 PM EST	Tornado Warning	TAE	Colquitt	41 min
Dec 30, 3:22 PM EST	Special Weather Statement	TAE	Ben Hill	53 min
Dec 30, 3:37 PM EST	Special Weather Statement	TAE	Colquitt	38 min
Dec 30, 3:57 PM EST	Severe Thunderstorm Warning	TAE	Brooks, Colquitt, Cook, Lowndes	63 min
Dec 30, 4:01 PM EST	Tornado Warning	TAE	Berrien, Cook	44 min
Dec 30, 4:16 PM EST	Special Weather Statement	TAE	Quitman	29 min
Dec 30, 4:39 PM EST	Severe Thunderstorm Warning	TAE	Clay, Quitman, Randolph	36 min
Dec 30, 4:49 PM EST	Special Weather Statement	TAE	Lanier	41 min
Dec 30, 5:09 PM EST	Severe Thunderstorm Warning	TAE	Calhoun, Dougherty, Randolph, Terrell	51 min
Dec 30, 5:13 PM EST	Severe Thunderstorm Warning	TAE	Clay, Early	47 min
Dec 30, 5:31 PM EST	Special Weather Statement	TAE	Lanier	44 min
Dec 30, 5:56 PM EST	Special Weather Statement	TAE	Calhoun, Clay	34 min
Dec 30, 6:08 PM EST	Special Weather Statement	TAE	Lanier	37 min
Dec 30, 6:30 PM EST	Special Weather Statement	TAE	Baker	30 min
Dec 30, 6:52 PM EST	Special Weather Statement	TAE	Dougherty	38 min
Dec 30, 4:25 PM EST	Special Weather Statement	TAE	Dale	35 min
Dec 30, 4:49 PM EST	Special Weather Statement	TAE	Henry	26 min

Nearby

Dense Fog Advisories in Florida, 2021 Every dense fog 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.