Alert archive / Florida / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 4, NWS Melbourne, FL

March 6, 2021Volusia County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Mar 6, 2021, 10:36 AM EST for Volusia County, Florida. It was in force for 39 min. 10 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: Mar 6, 2021, 10:36 AM EST (15:36 UTC)
Expired: Mar 6, 2021, 11:15 AM EST
In force: 39 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Volusia County, FL

The radar

The Melbourne radar (KMLB), 131 km from the middle of the area, began a volume at 15:40 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
Mar 6, 10:53 AM EST	HAIL 1.25	5 W Daytona Beach, FL	DAYTONA SPEEDWAY EM REPORTS HALF DOLLAR SIZED HAIL WEST OF I-95 NEAR LPGA BLVD.
Mar 6, 10:55 AM EST	HAIL 0.7	3 Sw Daytona Beach, FL	DAYTONA SPEEDWAY EM REPORTS DIME SIZED HAIL AT THE SPEEDWAY.
Mar 6, 10:55 AM EST	HAIL 0.7	4 Wsw Daytona Beach, FL	DAYTONA SPEEDWAY EM REPORTS SMALL HAIL HAS ACCUMULATED ON THE GROUND, SOME 4 TO 5 INCHES DEEP IN SPOTS - NEAR LPGA BLVD AND I-95. MOST OF THE HAIL IS HALF INCH SIZE OR LESS.
Mar 6, 10:56 AM EST	HAIL 1.25	3 Sw Daytona Beach, FL	CORRECTION OF PREVIOUS REPORT. DAYTONA SPEEDWAY EM REPORTS HALF DOLLAR SIZED HAIL AT THE SPEEDWAY.
Mar 6, 11:01 AM EST	HAIL 1.75	3 Sw Daytona Beach, FL	DAYTONA SPEEDWAY EM REPORTS GOLF BALL SIZED HAIL AT THE SPEEDWAY.
Mar 6, 11:04 AM EST	HAIL 1	1 S Daytona Beach, FL	DELAYED REPORT. NUMEROUS PICTURES SENT VIA SOCIAL MEDIA FROMT HE PUBLIC OF QUARTER SIZED HAIL IN DAYTONA BEACH AND DAYTONA GARDENS AREA. TIME ESTIMATED FROM RADAR.
Mar 6, 11:07 AM EST	HAIL 0.75	1 Ene Daytona Beach, FL	TRAINED SPOTTER REPORTS PENNY SIZED HAIL ON SOUTH HALIFAX DRIVE IN DAYTONA BEACH.
Mar 6, 11:08 AM EST	HAIL 1	2 Ese Daytona Beach, FL	DELAYED REPORT. TRAINED SPOTTER REPORTED QUARTER SIZED HAIL ALONG TROPICAL LANE IN DAYTONA BEACH. THE SPOTTER ALSO REPORTED SIGNIFICANT HAIL ACCUMULATIONS ON THE GROUND, ALONG WITH ESTIMATED PEAK WIND GUST OF 55 MPH.
Mar 6, 11:15 AM EST	HAIL 0.75	Daytona Beach Shores, FL	PUBLIC REPORTS SEVERAL INCHES OF SMALL HAIL HAVE ACCUMULATED ON THE GROUND IN DAYTONA BEACH SHORES. MOST OF THE HAIL IS PENNY SIZE OR SMALLER.
Mar 6, 11:15 AM EST	HAIL 1.25	4 Se Daytona Beach, FL	VOLUSIA COUNTY OCEAN RESCUE REPORTS HAIL UP TO HALF DOLLAR SIZE ON THE BEACH, WITH CONSIDERABLE ACCUMULATION OF HAIL SEEN ALONG MUCH OF THE BEACHFRONT. THIS IS NEAR THE 2900 BLOCK OF A1A IN DAYTONA BEACH SHORES.

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, 3.6 hours before the alert went out and 102 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: 1511 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 70 m²/s²
0-3 km storm-relative helicity: 116 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

026 
WUUS52 KMLB 061536
SVRMLB
FLC127-061615-
/O.NEW.KMLB.SV.W.0004.210306T1536Z-210306T1615Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Melbourne FL
1036 AM EST Sat Mar 6 2021

The National Weather Service in Melbourne has issued a

* Severe Thunderstorm Warning for...
  Northeastern Volusia County in east central Florida...

* Until 1115 AM EST.

* At 1036 AM EST, a severe thunderstorm was located near Daytona
  International Speedway, or near Holly Hill, moving east at 10 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Daytona Beach, Ormond Beach, South Daytona, Holly Hill and
  Ormond-By-the-Sea.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows!

&&

LAT...LON 2915 8092 2916 8118 2927 8119 2927 8115
      2929 8115 2935 8103
TIME...MOT...LOC 1536Z 255DEG 10KT 2922 8113 

HAIL...1.00IN
WIND...60MPH
 
$$

Kelly

1 follow-up statement

128 
WWUS52 KMLB 061602
SVSMLB

Severe Weather Statement
National Weather Service Melbourne FL
1102 AM EST Sat Mar 6 2021

FLC127-061615-
/O.CON.KMLB.SV.W.0004.000000T0000Z-210306T1615Z/
Volusia FL-
1102 AM EST Sat Mar 6 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 AM EST
FOR NORTH CENTRAL VOLUSIA COUNTY...

At 1102 AM EST, a severe thunderstorm was located over Daytona Beach,
moving east at 15 mph.

HAZARD...Golf ball size hail and 60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees.

Locations impacted include...
Daytona Beach, South Daytona, Holly Hill, Daytona Beach Shores and
Daytona International Speedway.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.

&&

LAT...LON 2916 8093 2915 8093 2916 8111 2924 8113
      2929 8103
TIME...MOT...LOC 1602Z 272DEG 11KT 2920 8104 

HAIL...1.75IN
WIND...60MPH
 
$$

Kelly

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 6, 3:40 AM EST	Beach Hazards Statement	MLB	Volusia	39 hr
Mar 6, 10:26 AM EST	Special Weather Statement	MLB	Volusia	49 min
Mar 6, 10:47 AM EST	Special Weather Statement	MLB	Lake	43 min
Mar 6, 10:55 AM EST	Special Weather Statement	MLB	Lake	50 min
Mar 6, 10:57 AM EST	Special Marine Warning	MLB		63 min
Mar 6, 11:43 AM EST	Special Weather Statement	MLB	Volusia	47 min
Mar 6, 12:48 PM EST	Special Weather Statement	MLB	Volusia	42 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.