Alert archive / Florida / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 7, NWS Jacksonville, FL

February 6, 2021Flagler County, Saint Johns County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Feb 6, 2021, 6:07 PM EST for Flagler County, Saint Johns County, Florida. It was in force for 23 min. 1 report 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: Feb 6, 2021, 6:07 PM EST (23:07 UTC)
Expired: Feb 6, 2021, 6:30 PM EST
In force: 23 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Flagler County, FL, Saint Johns County, FL

The radar

The Jacksonville radar (KJAX), 104 km from the middle of the area, began a volume at 23:07 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
Feb 6, 6:15 PM EST	HAIL 0.25	Palm Coast, FL	EMERGENCY MANAGER RELAYED REPORT OF PEA SIZED HAIL BETWEEN 6 AND 630 PM IN PALM COAST AND FLAGLER BEACH

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
Feb 6, 4:21 PM EST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 11.1 hours before the alert went out and 105 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: 845 m above ground
0-6 km bulk shear: 75 kt
0-1 km storm-relative helicity: 45 m²/s²
0-3 km storm-relative helicity: 370 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

503 
WUUS52 KJAX 062307
SVRJAX
FLC035-109-062330-
/O.NEW.KJAX.SV.W.0007.210206T2307Z-210206T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Jacksonville FL
607 PM EST Sat Feb 6 2021

The National Weather Service in Jacksonville has issued a

* Severe Thunderstorm Warning for...
  Northeastern Flagler County in northeastern Florida...
  Southeastern St. Johns County in northeastern Florida...

* Until 630 PM EST.

* At 607 PM EST, a severe thunderstorm was located near Bunnell,
  moving northeast at 40 mph.

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

  SOURCE...Radar indicated.

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

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until midnight EST for northeastern
Florida.

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 2949 8110 2939 8124 2963 8134 2967 8129
      2966 8128 2967 8126 2966 8125 2967 8122
      2969 8123 2969 8122 2970 8122 2971 8123
      2970 8123 2970 8124 2971 8124 2974 8120
TIME...MOT...LOC 2307Z 247DEG 37KT 2952 8132 

TORNADO...POSSIBLE
HAIL...0.75IN
WIND...60MPH
 
$$

SHASHY

1 follow-up statement

102 
WWUS52 KJAX 062328
SVSJAX

Severe Weather Statement
National Weather Service Jacksonville FL
628 PM EST Sat Feb 6 2021

FLC035-109-062338-
/O.EXP.KJAX.SV.W.0007.000000T0000Z-210206T2330Z/
Flagler FL-St. Johns FL-
628 PM EST Sat Feb 6 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN FLAGLER AND
SOUTHEASTERN ST. JOHNS COUNTIES WILL EXPIRE AT 630 PM EST...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.  However heavy rain
is still possible with this thunderstorm.

A Tornado Watch remains in effect until midnight EST for northeastern
Florida.

LAT...LON 2949 8110 2939 8124 2963 8134 2967 8129
      2966 8128 2967 8126 2966 8125 2967 8122
      2969 8123 2969 8122 2970 8122 2971 8123
      2970 8123 2970 8124 2971 8124 2974 8120
TIME...MOT...LOC 2328Z 243DEG 36KT 2960 8114 

$$

SHASHY

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 6, 10:45 AM EST	Small Craft Advisory	JAX		23 hr
Feb 6, 3:59 PM EST	Special Weather Statement	JAX	Gilchrist	46 min
Feb 6, 4:14 PM EST	Special Weather Statement	JAX	Marion	46 min
Feb 6, 4:42 PM EST	Special Weather Statement	JAX	Alachua, Gilchrist	48 min
Feb 6, 4:59 PM EST	Severe Thunderstorm Warning	JAX	Alachua, Bradford, Columbia, Gilchrist, Union	46 min
Feb 6, 5:02 PM EST	Special Weather Statement	JAX	Clay, Putnam	43 min
Feb 6, 5:06 PM EST	Special Weather Statement	JAX	Marion	39 min
Feb 6, 5:37 PM EST	Special Weather Statement	JAX	Marion, Putnam	38 min
Feb 6, 5:39 PM EST	Special Weather Statement	JAX	Clay, Duval	51 min
Feb 6, 5:41 PM EST	Tornado Warning	JAX	Flagler, Putnam	34 min
Feb 6, 5:46 PM EST	Special Weather Statement	JAX	Alachua, Bradford, Gilchrist, Union	44 min
Feb 6, 6:03 PM EST	Special Marine Warning	JAX		57 min
Feb 6, 6:30 PM EST	Special Weather Statement	JAX	Flagler	45 min
Feb 6, 6:32 PM EST	Special Weather Statement	JAX	Alachua, Bradford, Clay	43 min
Feb 6, 6:51 PM EST	Special Weather Statement	JAX	Flagler	24 min
Feb 6, 6:53 PM EST	Severe Thunderstorm Warning	JAX	Marion	35 min
Feb 6, 6:55 PM EST	Special Marine Warning	JAX		65 min
Feb 6, 6:56 PM EST	Special Marine Warning	JAX		64 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.