Alert archive / Florida / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 31, NWS Jacksonville, FL

April 17, 2021Flagler County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Apr 17, 2021, 8:25 PM EDT for Flagler County, Florida. It was in force for 35 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 17, 2021, 8:25 PM EDT (00:25 UTC)
Expired: Apr 17, 2021, 9:00 PM EDT
In force: 35 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Flagler County, FL

The radar

The Jacksonville radar (KJAX), 110 km from the middle of the area, began a volume at 00:27 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 17, 8:34 PM EDT	HAIL 0.88	Bunnell, FL	LATE REPORT VIA SOCIAL MEDIA, NICKEL SIZED HAIL WITH FREQ LIGHTNING IN BUNNELL.
Apr 17, 8:55 PM EDT	HAIL 0.75	2 E Bunnell, FL	REPORT OF 3/4 INCH HAIL LASTED ABOUT 10 MINUTES.

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

The nearest sounding before it

Jacksonville, FL (KJAX), launched 00:00Z, 0.4 hours before the alert went out and 111 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: 16 J/kg
Mixed-layer CIN: -78 J/kg
Mixed-layer LCL: 790 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: -74 m²/s²
0-3 km storm-relative helicity: 62 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -2.3

Open this sounding in Storm Lab

The text

As transmitted.

098 
WUUS52 KJAX 180025
SVRJAX
FLC035-180100-
/O.NEW.KJAX.SV.W.0031.210418T0025Z-210418T0100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Jacksonville FL
825 PM EDT Sat Apr 17 2021

The National Weather Service in Jacksonville has issued a

* Severe Thunderstorm Warning for...
  Flagler County in northeastern Florida...

* Until 900 PM EDT.

* At 825 PM EDT, a severe thunderstorm was located near Andalusia,
  moving east at 30 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Palm Coast, Flagler Beach, Bunnell, Andalusia, Marineland, Crescent
  Beach, Beverly Beach and Espanola.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2946 8110 2946 8112 2943 8111 2939 8142
      2940 8142 2939 8145 2940 8148 2956 8149
      2963 8139 2963 8132 2965 8132 2964 8131
      2967 8126 2966 8125 2967 8122 2971 8123
      2970 8124 2973 8124 2975 8121 2952 8110
TIME...MOT...LOC 0025Z 260DEG 28KT 2949 8138 

HAIL...<.75IN
WIND...60MPH
 
$$

SANDRIK

3 follow-up statements

489 
WWUS52 KJAX 180040
SVSJAX

Severe Weather Statement
National Weather Service Jacksonville FL
840 PM EDT Sat Apr 17 2021

FLC035-180100-
/O.CON.KJAX.SV.W.0031.000000T0000Z-210418T0100Z/
Flagler FL-
840 PM EDT Sat Apr 17 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM EDT
FOR CENTRAL FLAGLER COUNTY...

At 840 PM EDT, a severe thunderstorm was located over Palm Coast,
moving east at 30 mph.

HAZARD...70 mph wind gusts and nickel size hail.

SOURCE...Radar indicated.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
Palm Coast, Flagler Beach, Bunnell, Marineland, Beverly Beach and
Espanola.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2946 8110 2946 8112 2943 8111 2939 8142
      2952 8138 2959 8131 2965 8132 2964 8131
      2965 8128 2967 8126 2966 8125 2967 8121
      2968 8120 2966 8117 2951 8110
TIME...MOT...LOC 0040Z 260DEG 28KT 2951 8125 

TORNADO...POSSIBLE
HAIL...0.88IN
WIND...70MPH
 
$$

SANDRIK

134 
WWUS52 KJAX 180048
SVSJAX

Severe Weather Statement
National Weather Service Jacksonville FL
848 PM EDT Sat Apr 17 2021

FLC035-180100-
/O.CON.KJAX.SV.W.0031.000000T0000Z-210418T0100Z/
Flagler FL-
848 PM EDT Sat Apr 17 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM EDT
FOR NORTHEASTERN FLAGLER COUNTY...

At 848 PM EDT, a severe thunderstorm was located near Palm Coast,
moving east at 35 mph.

HAZARD...70 mph wind gusts and nickel size hail.

SOURCE...Radar indicated.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
Palm Coast, Flagler Beach, Bunnell, Beverly Beach and Espanola. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2946 8110 2946 8112 2943 8111 2941 8132
      2949 8134 2953 8129 2958 8128 2963 8123
      2968 8120 2966 8117 2952 8110
TIME...MOT...LOC 0048Z 263DEG 29KT 2950 8118 

TORNADO...POSSIBLE
HAIL...0.88IN
WIND...70MPH
 
$$

SANDRIK

680 
WWUS52 KJAX 180053 CCA
SVSJAX

Severe Weather Statement
National Weather Service Jacksonville FL
853 PM EDT Sat Apr 17 2021

FLC035-180100-
/O.COR.KJAX.SV.W.0031.000000T0000Z-210418T0100Z/
Flagler FL-
853 PM EDT Sat Apr 17 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM EDT
FOR NORTHEASTERN FLAGLER COUNTY...

At 853 PM EDT, a severe thunderstorm was located over Bunnell, moving
east at 25 mph.

HAZARD...70 mph wind gusts and nickel size hail.

SOURCE...Radar indicated.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
Palm Coast, Flagler Beach, Bunnell, Beverly Beach and Espanola. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2946 8110 2946 8112 2943 8111 2941 8132
      2949 8134 2953 8129 2958 8128 2963 8123
      2968 8120 2966 8117 2952 8110
TIME...MOT...LOC 0048Z 259DEG 24KT 2950 8118 

TORNADO...POSSIBLE
HAIL...0.88IN
WIND...70MPH
 
$$

SANDRIK

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 17, 8:34 PM EDT	Special Marine Warning	JAX		56 min
Apr 17, 8:44 PM EDT	Special Weather Statement	JAX	Alachua	46 min
Apr 17, 8:56 PM EDT	Special Weather Statement	JAX	Putnam	49 min
Apr 17, 9:00 PM EDT	Special Weather Statement	JAX	Flagler	15 min
Apr 17, 9:32 PM EDT	Special Weather Statement	JAX	Flagler	58 min
Apr 17, 9:40 PM EDT	Special Weather Statement	JAX	Putnam	35 min
Apr 17, 10:13 PM EDT	Special Weather Statement	JAX	Flagler	32 min
Apr 17, 10:23 PM EDT	Special Marine Warning	JAX		19 min
Apr 18, 9:02 AM EDT	Special Weather Statement	JAX	Alachua	28 min
Apr 18, 10:16 AM EDT	Special Weather Statement	JAX	Flagler	44 min
Apr 18, 10:22 AM EDT	Special Marine Warning	JAX		83 min
Apr 18, 10:25 AM EDT	Severe Thunderstorm Warning	JAX	Flagler	22 min
Apr 18, 11:46 AM EDT	Special Marine Warning	JAX		14 min
Apr 18, 6:42 PM EDT	Special Weather Statement	JAX	Marion	48 min
Apr 18, 7:23 PM EDT	Special Weather Statement	JAX	Marion	37 min

Nearby

Severe Thunderstorm Warnings in Florida, 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.