Alert archive / Florida / Frost Advisories in 2021

Frost Advisory 7, NWS Jacksonville, FL

April 2, 202111 counties in Florida; 8 counties in Georgia

NWS Jacksonville, FL issued this frost advisory at Apr 2, 2021, 2:49 AM EDT for 11 counties in Florida; 8 counties in Georgia. It took effect at Apr 3, 2021, 4:00 AM EDT. It was in force for 5 hr.

The area

The counties it named.

The facts

Issued
Apr 2, 2021, 2:49 AM EDT (06:49 UTC)
In effect from
Apr 3, 2021, 4:00 AM EDT
Expired
Apr 3, 2021, 9:00 AM EDT
In force
5 hr
Issued by
NWS Jacksonville, FL

Counties Alachua County, FL, Baker County, FL, Bradford County, FL, Clay County, FL, Duval County, FL, Gilchrist County, FL, Marion County, FL, Nassau County, FL, Putnam County, FL, Suwannee County, FL, Union County, FL, Atkinson County, GA, Brantley County, GA, Camden County, GA, Charlton County, GA, Clinch County, GA, Echols County, GA, Glynn County, GA, Ware County, GA

The radar

The Jacksonville radar (KJAX), 51 km from the middle of the area, began a volume at 06:55 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

Jacksonville, FL (KJAX), launched 00:00Z, 6.8 hours before the alert went out and 51 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-pSkew-T log-p diagram, Jacksonville, FL at 00:00Z on 2021-04-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Jacksonville, FL at 00:00Z on 2021-04-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -62 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
2756 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
-62 m²/s²
0-3 km storm-relative helicity
4 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

876 
WWUS72 KJAX 020649
NPWJAX

URGENT - WEATHER MESSAGE
National Weather Service Jacksonville FL
249 AM EDT Fri Apr 2 2021

GAZ132>136-151-031300-
/O.NEW.KJAX.FZ.W.0006.210403T0800Z-210403T1300Z/
Coffee-Jeff Davis-Bacon-Appling-Wayne-Pierce-
Including the cities of Douglas, Hazlehurst, Alma, New Lacy, 
Baxley, Pine Grove, Plant Hatch, Doctortown, Gardi, Jesup, 
and Blackshear
249 AM EDT Fri Apr 2 2021

...FREEZE WARNING IN EFFECT FROM 4 AM TO 9 AM EDT SATURDAY...

* WHAT...Sub-freezing temperatures as low as 31 expected.

* WHERE...Coffee, Jeff Davis, Bacon, Appling, Wayne and Pierce 
  Counties.

* WHEN...From 4 AM to 9 AM EDT Saturday.

* IMPACTS...Frost and freeze conditions could kill crops and 
  other sensitive vegetation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Appropriate action should be taken to ensure tender vegetation
and outdoor pets have adequate protection from the cold
temperatures. Young children, the elderly and the homeless are
especially vulnerable to the cold. Take measures to protect them.

&&

$$

FLZ020-021-023-024-030-031-035-122-136-222-232-236-237-425-GAZ149-
152-153-162-163-165-250-264-350-364-031300-
/O.NEW.KJAX.FR.Y.0007.210403T0800Z-210403T1300Z/
Hamilton-Suwannee-Baker-Inland Nassau-Union-Bradford-Gilchrist-
Northern Columbia-Eastern Alachua-Southern Columbia-Western Clay-
Western Alachua-Western Putnam-Western Duval-Atkinson-Brantley-
Inland Glynn-Echols-Clinch-Inland Camden-Northern Ware-
Northeastern Charlton-Southern Ware-Western Charlton-
Including the cities of Jasper, Jennings, West Lake, Belmont, 
White Springs, Houston, Live Oak, McAlpin, Newburn, 
Suwannee Springs, Macclenny, Olustee, Ratliff, Hilliard, 
Kings Ferry, Bryceville, Lake Butler, Starke, New River, Trenton,
Winfield, Suwannee Valley, Gainesville, Gainesville Airport, 
Newnans Lake, Columbia, Lake City, Oleno State Park, Lulu, 
Watertown, Doctors Inlet, Lakeside, Bellair, Middleburg, 
High Springs, Newberry, Archer, Carraway, Normandy, Axson, 
Pearson, Willacoochee, Atkinson, Hickox, Hortense, Nahunta, 
Raybon, Waynesville, Hoboken, Thalmann, Needmore, Statenville, 
Homerville, Colesburg, Tarboro, Waverly, Woodbine, Needham, 
Waycross, Winokur, Folkston, St. George, Homeland, Race Pond, 
and Stephen Foster State Park
249 AM EDT Fri Apr 2 2021

...FROST ADVISORY IN EFFECT FROM 4 AM TO 9 AM EDT SATURDAY...

* WHAT...Temperatures as low as 33 will result in frost 
  formation.

* WHERE...Portions of southeast Georgia and northeast and 
  northern Florida.

* WHEN...From 4 AM to 9 AM EDT Saturday.

* IMPACTS...Frost could kill sensitive outdoor vegetation if 
  left uncovered.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$
2 follow-up statements
360 
WWUS72 KJAX 021955
NPWJAX

URGENT - WEATHER MESSAGE
National Weather Service Jacksonville FL
355 PM EDT Fri Apr 2 2021

GAZ149-152-250-031300-
/O.UPG.KJAX.FR.Y.0007.210403T0800Z-210403T1300Z/
/O.EXA.KJAX.FZ.W.0006.210403T0800Z-210403T1300Z/
Atkinson-Brantley-Northern Ware-
Including the cities of Axson, Pearson, Willacoochee, Atkinson, 
Hickox, Hortense, Nahunta, Raybon, Waynesville, Hoboken, Needham,
and Waycross
355 PM EDT Fri Apr 2 2021

...FREEZE WARNING IN EFFECT FROM 4 AM TO 9 AM EDT SATURDAY...

* WHAT...Sub-freezing temperatures as low as 31 expected.

* WHERE...Atkinson, Brantley and Northern Ware Counties.

* WHEN...From 4 AM to 9 AM EDT Saturday.

* IMPACTS...Frost and freeze conditions could kill crops and 
  other sensitive vegetation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Appropriate action should be taken to ensure tender vegetation
and outdoor pets have adequate protection from the cold
temperatures. Young children, the elderly and the homeless are
especially vulnerable to the cold. Take measures to protect them.

&&

$$

GAZ132>136-151-031300-
/O.CON.KJAX.FZ.W.0006.210403T0800Z-210403T1300Z/
Coffee-Jeff Davis-Bacon-Appling-Wayne-Pierce-
Including the cities of Douglas, Hazlehurst, Alma, New Lacy, 
Baxley, Pine Grove, Plant Hatch, Doctortown, Gardi, Jesup, 
and Blackshear
355 PM EDT Fri Apr 2 2021

...FREEZE WARNING REMAINS IN EFFECT FROM 4 AM TO 9 AM EDT
SATURDAY...

* WHAT...Sub-freezing temperatures as low as 31 expected.

* WHERE...Coffee, Jeff Davis, Bacon, Appling, Wayne and Pierce 
  Counties.

* WHEN...From 4 AM to 9 AM EDT Saturday.

* IMPACTS...Frost and freeze conditions could kill crops and 
  other sensitive vegetation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Appropriate action should be taken to ensure tender vegetation
and outdoor pets have adequate protection from the cold
temperatures. Young children, the elderly and the homeless are
especially vulnerable to the cold. Take measures to protect them.

&&

$$

FLZ225-240-340-031300-
/O.EXA.KJAX.FR.Y.0007.210403T0800Z-210403T1300Z/
Trout River-Central Marion-Western Marion-
Including the cities of Anthony, Burbank, Ocala, Weirsdale, 
and Ocala Airport
355 PM EDT Fri Apr 2 2021

...FROST ADVISORY IN EFFECT FROM 4 AM TO 9 AM EDT SATURDAY...

* WHAT...Temperatures as low as 33 will result in frost 
  formation.

* WHERE...Trout River, Central Marion and Western Marion 
  Counties.

* WHEN...From 4 AM to 9 AM EDT Saturday.

* IMPACTS...Frost could kill sensitive outdoor vegetation if 
  left uncovered.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

FLZ020-021-023-024-030-031-035-122-136-222-232-236-237-425-GAZ153-
162-163-165-264-350-364-031300-
/O.CON.KJAX.FR.Y.0007.210403T0800Z-210403T1300Z/
Hamilton-Suwannee-Baker-Inland Nassau-Union-Bradford-Gilchrist-
Northern Columbia-Eastern Alachua-Southern Columbia-Western Clay-
Western Alachua-Western Putnam-Western Duval-Inland Glynn-Echols-
Clinch-Inland Camden-Northeastern Charlton-Southern Ware-
Western Charlton-
Including the cities of Jasper, Jennings, West Lake, Belmont, 
White Springs, Houston, Live Oak, McAlpin, Newburn, 
Suwannee Springs, Macclenny, Olustee, Ratliff, Hilliard, 
Kings Ferry, Bryceville, Lake Butler, Starke, New River, Trenton,
Winfield, Suwannee Valley, Gainesville, Gainesville Airport, 
Newnans Lake, Columbia, Lake City, Oleno State Park, Lulu, 
Watertown, Doctors Inlet, Lakeside, Bellair, Middleburg, 
High Springs, Newberry, Archer, Carraway, Normandy, Thalmann, 
Needmore, Statenville, Homerville, Colesburg, Tarboro, Waverly, 
Woodbine, Winokur, Folkston, St. George, Homeland, Race Pond, 
and Stephen Foster State Park
355 PM EDT Fri Apr 2 2021

...FROST ADVISORY REMAINS IN EFFECT FROM 4 AM TO 9 AM EDT
SATURDAY...

* WHAT...Temperatures as low as 33 will result in frost 
  formation.

* WHERE...Portions of southeast Georgia and northeast and 
  northern Florida.

* WHEN...From 4 AM to 9 AM EDT Saturday.

* IMPACTS...Frost could kill sensitive outdoor vegetation if 
  left uncovered.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$
912 
WWUS72 KJAX 031300
NPWJAX

URGENT - WEATHER MESSAGE
National Weather Service Jacksonville FL
900 AM EDT Sat Apr 3 2021

GAZ132>136-149-151-152-250-031400-
/O.EXP.KJAX.FZ.W.0006.000000T0000Z-210403T1300Z/
Coffee-Jeff Davis-Bacon-Appling-Wayne-Atkinson-Pierce-Brantley-
Northern Ware-
Including the cities of Douglas, Hazlehurst, Alma, New Lacy, 
Baxley, Pine Grove, Plant Hatch, Doctortown, Gardi, Jesup, Axson,
Pearson, Willacoochee, Blackshear, Atkinson, Hickox, Hortense, 
Nahunta, Raybon, Waynesville, Hoboken, Needham, and Waycross
900 AM EDT Sat Apr 3 2021

...FREEZE WARNING HAS EXPIRED...


$$

FLZ020-021-023-024-030-031-035-122-136-222-225-232-236-237-240-
340-425-GAZ153-162-163-165-264-350-364-031400-
/O.EXP.KJAX.FR.Y.0007.000000T0000Z-210403T1300Z/
Hamilton-Suwannee-Baker-Inland Nassau-Union-Bradford-Gilchrist-
Northern Columbia-Eastern Alachua-Southern Columbia-Trout River-
Western Clay-Western Alachua-Western Putnam-Central Marion-
Western Marion-Western Duval-Inland Glynn-Echols-Clinch-
Inland Camden-Northeastern Charlton-Southern Ware-
Western Charlton-
Including the cities of Jasper, Jennings, West Lake, Belmont, 
White Springs, Houston, Live Oak, McAlpin, Newburn, 
Suwannee Springs, Macclenny, Olustee, Ratliff, Hilliard, 
Kings Ferry, Bryceville, Lake Butler, Starke, New River, Trenton,
Winfield, Suwannee Valley, Gainesville, Gainesville Airport, 
Newnans Lake, Columbia, Lake City, Oleno State Park, Lulu, 
Watertown, Doctors Inlet, Lakeside, Bellair, Middleburg, 
High Springs, Newberry, Archer, Carraway, Anthony, Burbank, 
Ocala, Weirsdale, Ocala Airport, Normandy, Thalmann, Needmore, 
Statenville, Homerville, Colesburg, Tarboro, Waverly, Woodbine, 
Winokur, Folkston, St. George, Homeland, Race Pond, 
and Stephen Foster State Park
900 AM EDT Sat Apr 3 2021

...FROST ADVISORY HAS EXPIRED...


$$

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 2, 2:46 AM EDTRip Current StatementJAXDuval, Flagler, Nassau41 hr
Apr 2, 2:49 AM EDTFreeze WarningJAXAppling, Atkinson, Bacon, Brantley, Coffee, Jeff Davis and 3 more30 hr

Nearby

Frost Advisories in Florida, 2021Frost Advisories in Georgia, 2021Every frost 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.