Alert archive / Florida / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 32, NWS Jacksonville, FL

April 18, 2021Flagler County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Apr 18, 2021, 10:25 AM EDT for Flagler County, Florida. It was in force for 22 min. 7 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 18, 2021, 10:25 AM EDT (14:25 UTC)
Expired
Apr 18, 2021, 10:47 AM EDT
In force
22 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), 129 km from the middle of the area, began a volume at 14:27 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

TimeReportWhereRemark
Apr 18, 10:31 AM EDTHAIL 0.251 Nnw Bunnell, FLEMERGENCY MANAGER RECEIVED A REPORT OF PEA SAIL HAIL OBSERVED AT CR13 AND US1 IN BUNNEL.
Apr 18, 10:34 AM EDTHAIL 0.51 Ene Bunnell, FLDIME SIZE HAIL REPORTED AT FIRE RESCUE STATION 62 IN BUNNEL.
Apr 18, 10:35 AM EDTTSTM WND DMG3 S Bunnell, FLFLAGLER COUNTY FIRE RESCUE REPORTED MUTLIPLE TREES DOWN ALONG STATE ROAD 11 FOR A STRETCH OF 4 MILES, FROM 1 MILE SOUTH OF BUNNELL TO 5 MILES SOUTH OF BUNNELL.
Apr 18, 10:43 AM EDTHAIL 15 Ese Bunnell, FLQUARTER SIZE HAIL WAS OBSERVED ALONG SEMINOLE WOODS SECTION IN PALM COAST.
Apr 18, 10:45 AM EDTHAIL 1.254 Se Bunnell, FLEMERGENCY MANGAGER RELAYED MULTIPLE REPORTS FROM SEMINOLE WOODS SECTION OF PALM COAST SOUTH OF SR 100 OF UP TO QUARTER TO HALF DOLLAR SIZE HAIL POSTED IN IMAGES AND VIDEO VIA SOCIAL MEDIA.
Apr 18, 10:45 AM EDTHAIL 1.254 Se Bunnell, FLEMERGENCY MANGAGER RELAYED MULTIPLE REPORTS OF UP TO QUARTER TO HALF DOLLAR SIZE HAIL POSTED IN IMAGES AND VIDEO VIA SOCIAL MEDIA.
Apr 18, 10:45 AM EDTMARINE TSTM WIND 458 Nnw Ormond By The Sea, FLWXFLOW SITE AT RIVERVIEW ROAD IN FLAGLER BEACH REPORTED A 45MPH/39KT WIND GUST FROM THE SW

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

The nearest sounding before it

Cape Canaveral, FL (KXMR), launched 12:00Z, 2.4 hours before the alert went out and 127 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, Cape Canaveral, FL at 12:00Z on 2021-04-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 298 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Cape Canaveral, FL at 12:00Z on 2021-04-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 75 square meters per square second.19395878Sfc1 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
298 J/kg
Mixed-layer CIN
-75 J/kg
Mixed-layer LCL
852 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
75 m²/s²
0-3 km storm-relative helicity
145 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.9

Open this sounding in Storm Lab

The text

As transmitted.

877 
WUUS52 KJAX 181425
SVRJAX
FLC035-181515-
/O.NEW.KJAX.SV.W.0032.210418T1425Z-210418T1515Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Jacksonville FL
1025 AM EDT Sun Apr 18 2021

The National Weather Service in Jacksonville has issued a

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

* Until 1115 AM EDT.

* At 1025 AM EDT, a severe thunderstorm was located near Bunnell,
  moving east at 45 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, Beverly Beach and Espanola. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2941 8116 2927 8115 2926 8141 2927 8142
      2934 8142 2952 8143 2958 8118 2943 8110
TIME...MOT...LOC 1425Z 268DEG 41KT 2944 8133 

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

CORDERO
2 follow-up statements
375 
WWUS52 KJAX 181444
SVSJAX

Severe Weather Statement
National Weather Service Jacksonville FL
1044 AM EDT Sun Apr 18 2021

FLC035-181515-
/O.CON.KJAX.SV.W.0032.000000T0000Z-210418T1515Z/
Flagler FL-
1044 AM EDT Sun Apr 18 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 AM EDT
FOR SOUTHEASTERN FLAGLER COUNTY...

At 1043 AM EDT, a severe thunderstorm was located near Flagler Beach,
moving east at 45 mph.

HAZARD...PENNY SIZE HAIL IS POSSIBLE.

SOURCE...Radar indicated.

Locations impacted include...
Flagler Beach and Beverly Beach. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2942 8114 2941 8116 2927 8115 2927 8142
      2935 8119 2949 8115 2957 8118 2958 8118
      2943 8110
TIME...MOT...LOC 1443Z 267DEG 58KT 2943 8106 

0.75IN
<50MPH
 
$$

CORDERO
241 
WWUS52 KJAX 181447
SVSJAX

Severe Weather Statement
National Weather Service Jacksonville FL
1047 AM EDT Sun Apr 18 2021

FLC035-181457-
/O.CAN.KJAX.SV.W.0032.000000T0000Z-210418T1515Z/
Flagler FL-
1047 AM EDT Sun Apr 18 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN FLAGLER COUNTY IS
CANCELLED...
        
The storm which prompted the warning has moved offshore.
Therefore, the warning has been cancelled.

LAT...LON 2942 8114 2941 8116 2927 8115 2927 8142
      2935 8119 2949 8115 2957 8118 2958 8118
      2943 8110
TIME...MOT...LOC 1445Z 268DEG 41KT 2943 8100 

$$

CORDERO

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 17, 8:25 PM EDTSevere Thunderstorm WarningJAXFlagler35 min
Apr 17, 8:34 PM EDTSpecial Marine WarningJAX56 min
Apr 17, 8:44 PM EDTSpecial Weather StatementJAXAlachua46 min
Apr 17, 8:56 PM EDTSpecial Weather StatementJAXPutnam49 min
Apr 17, 9:00 PM EDTSpecial Weather StatementJAXFlagler15 min
Apr 17, 9:32 PM EDTSpecial Weather StatementJAXFlagler58 min
Apr 17, 9:40 PM EDTSpecial Weather StatementJAXPutnam35 min
Apr 17, 10:13 PM EDTSpecial Weather StatementJAXFlagler32 min
Apr 17, 10:23 PM EDTSpecial Marine WarningJAX19 min
Apr 18, 9:02 AM EDTSpecial Weather StatementJAXAlachua28 min
Apr 18, 10:16 AM EDTSpecial Weather StatementJAXFlagler44 min
Apr 18, 10:22 AM EDTSpecial Marine WarningJAX83 min
Apr 18, 11:46 AM EDTSpecial Marine WarningJAX14 min
Apr 18, 6:42 PM EDTSpecial Weather StatementJAXMarion48 min
Apr 18, 7:23 PM EDTSpecial Weather StatementJAXMarion37 min

Nearby

Severe Thunderstorm Warnings in Florida, 2021Every 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.