Alert archive / Florida / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 48, NWS Jacksonville, FL

April 24, 2021Baker County, Columbia County, Nassau County, Florida; Charlton County, Georgia

NWS Jacksonville, FL issued this severe thunderstorm warning at Apr 24, 2021, 4:10 PM EDT for Baker County, Columbia County, Nassau County, Florida; Charlton County, Georgia. It was in force for 28 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Apr 24, 2021, 4:10 PM EDT (20:10 UTC)
Expired: Apr 24, 2021, 4:38 PM EDT
In force: 28 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Baker County, FL, Columbia County, FL, Nassau County, FL, Charlton County, GA

The radar

The Jacksonville radar (KJAX), 25 km from the middle of the area, began a volume at 20:13 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.

What was reported inside it

Time	Report	Where	Remark
Apr 24, 4:24 PM EDT	TSTM WND DMG	1 Se Callahan, FL	NASSUA COUNTY 911 REPORTED A TREE DOWNED ALONG US-1 NEAR CALLAHAN. TIME ESTIMATION BASED ON RADAR.
Apr 24, 4:27 PM EDT	TSTM WND DMG	4 Ese Callahan, FL	911 CALL CENTER REPORTED A WIRE DOWN ON JONAS DR. TIME ESTIMATION BASED ON RADAR

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 24, 10:35 AM EDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 8.2 hours before the alert went out and 26 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 984 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 180 m²/s²
0-3 km storm-relative helicity: 276 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

408 
WUUS52 KJAX 242010
SVRJAX
FLC003-023-089-GAC049-242100-
/O.NEW.KJAX.SV.W.0048.210424T2010Z-210424T2100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Jacksonville FL
410 PM EDT Sat Apr 24 2021

The National Weather Service in Jacksonville has issued a

* Severe Thunderstorm Warning for...
  Southwestern Nassau County in northeastern Florida...
  Baker County in northeastern Florida...
  East central Columbia County in northern Florida...
  Southeastern Charlton County in southeastern Georgia...

* Until 500 PM EDT.

* At 410 PM EDT, a severe thunderstorm was located near Taylor, or 19
  miles southeast of Fargo, moving east at 45 mph.

  HAZARD...60 mph wind gusts and half dollar size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Callahan, Taylor, Macclenny, Glen St. Mary, Nassau Village-Ratliff,
  Ratliff, St. George and Bryceville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 600 PM EDT for northern and
northeastern Florida...and southeastern Georgia.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3054 8174 3053 8177 3051 8178 3050 8180
      3027 8205 3021 8205 3031 8251 3054 8247
      3057 8171
TIME...MOT...LOC 2010Z 271DEG 38KT 3045 8239 

HAIL...1.25IN
WIND...60MPH
 
$$

BOOTHE

2 follow-up statements

767 
WWUS52 KJAX 242031
SVSJAX

Severe Weather Statement
National Weather Service Jacksonville FL
431 PM EDT Sat Apr 24 2021

FLC023-242040-
/O.CAN.KJAX.SV.W.0048.000000T0000Z-210424T2100Z/
Columbia FL-
431 PM EDT Sat Apr 24 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL COLUMBIA COUNTY
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 600 PM EDT for northeastern
Florida.

LAT...LON 3054 8174 3053 8177 3051 8178 3050 8180
      3036 8195 3040 8228 3055 8224 3057 8171
TIME...MOT...LOC 2030Z 271DEG 38KT 3045 8213 

$$

FLC003-089-GAC049-242100-
/O.CON.KJAX.SV.W.0048.000000T0000Z-210424T2100Z/
Nassau FL-Baker FL-Charlton GA-
431 PM EDT Sat Apr 24 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM EDT
FOR SOUTHWESTERN NASSAU...NORTH CENTRAL BAKER AND SOUTHEASTERN
CHARLTON COUNTIES...

At 430 PM EDT, a severe thunderstorm was located 7 miles southwest of
St. George, or 19 miles southwest of Callahan, moving east at 45 mph.

HAZARD...60 mph wind gusts and nickel size hail.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Callahan, Ratliff, St. George, Bryceville and Nassau Village-Ratliff.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 600 PM EDT for northeastern
Florida.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3054 8174 3053 8177 3051 8178 3050 8180
      3036 8195 3040 8228 3055 8224 3057 8171
TIME...MOT...LOC 2030Z 271DEG 38KT 3045 8213 

HAIL...0.88IN
WIND...60MPH
 
$$

BOOTHE

289 
WWUS52 KJAX 242038
SVSJAX

Severe Weather Statement
National Weather Service Jacksonville FL
438 PM EDT Sat Apr 24 2021

FLC003-089-GAC049-242047-
/O.CAN.KJAX.SV.W.0048.000000T0000Z-210424T2100Z/
Nassau FL-Baker FL-Charlton GA-
438 PM EDT Sat Apr 24 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN NASSAU...NORTH
CENTRAL BAKER AND SOUTHEASTERN CHARLTON COUNTIES IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.  However gusty winds are
still possible with this thunderstorm.

A Tornado Watch remains in effect until 600 PM EDT for northeastern
Florida.

LAT...LON 3054 8174 3053 8177 3051 8178 3050 8180
      3036 8195 3040 8228 3055 8224 3057 8171
TIME...MOT...LOC 2035Z 271DEG 38KT 3045 8204 

$$

BOOTHE

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 24, 1:37 PM EDT	Special Marine Warning	JAX		113 min
Apr 24, 2:36 PM EDT	Tornado Warning	JAX	Hamilton	24 min
Apr 24, 2:56 PM EDT	Severe Thunderstorm Warning	JAX	Columbia, Hamilton	49 min
Apr 24, 3:03 PM EDT	Tornado Warning	JAX	Columbia, Hamilton	27 min
Apr 24, 3:14 PM EDT	Severe Thunderstorm Warning	JAX	Columbia, Hamilton	46 min
Apr 24, 3:21 PM EDT	Special Weather Statement	JAX	Duval	24 min
Apr 24, 3:25 PM EDT	Special Marine Warning	JAX		79 min
Apr 24, 3:30 PM EDT	Severe Thunderstorm Warning	JAX	Baker, Columbia	45 min
Apr 24, 3:40 PM EDT	Severe Thunderstorm Warning	JAX	Baker, Columbia, Hamilton	35 min
Apr 24, 3:57 PM EDT	Severe Thunderstorm Warning	JAX	Baker, Nassau	48 min
Apr 24, 4:18 PM EDT	Severe Thunderstorm Warning	JAX	Duval, Nassau	42 min
Apr 24, 4:44 PM EDT	Special Marine Warning	JAX		46 min
Apr 24, 5:10 PM EDT	Special Marine Warning	JAX		35 min
Apr 24, 5:20 PM EDT	Special Weather Statement	JAX	Duval	25 min
Apr 24, 5:31 PM EDT	Special Marine Warning	JAX		59 min
Apr 24, 6:11 PM EDT	Special Marine Warning	JAX		64 min
Apr 24, 10:57 AM EDT	Severe Thunderstorm Warning	JAX	Atkinson, Clinch	48 min
Apr 24, 11:15 AM EDT	Severe Thunderstorm Warning	JAX	Coffee	45 min
Apr 24, 11:35 AM EDT	Severe Thunderstorm Warning	JAX	Bacon, Ware	40 min
Apr 24, 11:54 AM EDT	Severe Thunderstorm Warning	JAX	Atkinson	21 min
Apr 24, 12:04 PM EDT	Severe Thunderstorm Warning	JAX	Appling, Brantley, Pierce, Wayne	41 min
Apr 24, 12:08 PM EDT	Tornado Warning	JAX	Bacon	22 min
Apr 24, 12:18 PM EDT	Severe Thunderstorm Warning	JAX	Atkinson, Bacon, Clinch, Pierce, Ware	31 min
Apr 24, 12:36 PM EDT	Severe Thunderstorm Warning	JAX	Wayne	24 min
Apr 24, 12:40 PM EDT	Special Weather Statement	JAX	Clinch	50 min
Apr 24, 12:47 PM EDT	Special Weather Statement	JAX	Clinch, Pierce, Ware, Wayne	28 min
Apr 24, 1:20 PM EDT	Special Weather Statement	JAX	Brantley, Clinch, Ware	25 min
Apr 24, 1:46 PM EDT	Severe Thunderstorm Warning	JAX	Clinch, Echols	44 min
Apr 24, 1:50 PM EDT	Special Weather Statement	JAX	Camden, Charlton, Glynn	40 min
Apr 24, 2:15 PM EDT	Severe Thunderstorm Warning	JAX	Glynn	15 min
Apr 24, 2:32 PM EDT	Severe Thunderstorm Warning	JAX	Clinch, Echols	43 min
Apr 24, 3:48 PM EDT	Special Weather Statement	JAX	Camden	27 min
Apr 24, 5:40 PM EDT	Special Weather Statement	JAX	Coffee, Jeff Davis	35 min
Apr 24, 6:18 PM EDT	Special Weather Statement	JAX	Appling, Bacon, Coffee, Jeff Davis, Wayne	87 min
Apr 24, 6:39 PM EDT	Severe Thunderstorm Warning	JAX	Atkinson, Coffee	36 min
Apr 24, 7:12 PM EDT	Severe Thunderstorm Warning	JAX	Appling, Atkinson, Bacon, Coffee, Pierce, Ware	33 min
Apr 24, 7:40 PM EDT	Severe Thunderstorm Warning	JAX	Appling, Bacon, Brantley, Pierce, Ware, Wayne	35 min
Apr 24, 7:57 PM EDT	Special Weather Statement	JAX	Coffee, Jeff Davis	48 min

Nearby

Severe Thunderstorm Warnings in Florida, 2021 Severe Thunderstorm Warnings in Georgia, 2021 Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.