Alert archive / Florida / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 14, NWS Melbourne, FL

May 6, 2021Volusia County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at May 6, 2021, 1:20 PM EDT for Volusia County, Florida. It was in force for 40 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: May 6, 2021, 1:20 PM EDT (17:20 UTC)
Expired: May 6, 2021, 2:00 PM EDT
In force: 40 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 Jacksonville radar (KJAX), 132 km from the middle of the area, began a volume at 17:21 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
May 6, 1:55 PM EDT	TSTM WND GST 53	6 Nnw Holly Hill, FL	WXFLOW SITE AT LEOLA AVE REPORTED A 53MPH/46KT WIND GUST FROM THE NW

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, 5.3 hours before the alert went out and 124 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: 712 J/kg
Mixed-layer CIN: -59 J/kg
Mixed-layer LCL: 989 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 52 m²/s²
0-3 km storm-relative helicity: 77 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted.

993 
WUUS52 KMLB 061720
SVRMLB
FLC127-061800-
/O.NEW.KMLB.SV.W.0014.210506T1720Z-210506T1800Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Melbourne FL
120 PM EDT Thu May 6 2021

The National Weather Service in Melbourne has issued a

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

* Until 200 PM EDT.

* At 120 PM EDT, a severe thunderstorm was located near Crescent
  City, moving east at 45 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, Holly Hill, Ormond-By-the-Sea and Lake
  George.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2943 8107 2924 8098 2927 8164 2934 8162
      2938 8145 2940 8142 2927 8142 2927 8115
      2941 8116 2943 8110
TIME...MOT...LOC 1720Z 274DEG 40KT 2938 8151 

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

Weitlich

1 follow-up statement

643 
WWUS52 KMLB 061739
SVSMLB

Severe Weather Statement
National Weather Service Melbourne FL
139 PM EDT Thu May 6 2021

FLC127-061800-
/O.CON.KMLB.SV.W.0014.000000T0000Z-210506T1800Z/
Volusia FL-
139 PM EDT Thu May 6 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 PM EDT
FOR NORTH CENTRAL VOLUSIA COUNTY...

At 138 PM EDT, a severe thunderstorm was located near Bunnell, moving
east at 40 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, Holly Hill, Ormond-By-the-Sea and Ormond
Beach Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2943 8107 2924 8098 2924 8102 2926 8126
      2926 8134 2927 8115 2941 8116 2943 8110
TIME...MOT...LOC 1738Z 271DEG 40KT 2938 8128 

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

Weitlich

The office that day

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

Issued	Product	Office	Counties	Lasted
May 5, 8:06 PM EDT	Special Weather Statement	MLB	Brevard	39 min
May 5, 8:09 PM EDT	Special Marine Warning	MLB		66 min
May 5, 8:21 PM EDT	Special Weather Statement	MLB	Orange	24 min
May 5, 8:41 PM EDT	Special Weather Statement	MLB	Brevard	49 min
May 6, 12:23 PM EDT	Special Weather Statement	MLB	Volusia	67 min
May 6, 12:26 PM EDT	Special Marine Warning	MLB		64 min
May 6, 12:31 PM EDT	Special Weather Statement	MLB	Brevard	29 min
May 6, 12:42 PM EDT	Special Weather Statement	MLB	Lake	48 min
May 6, 12:55 PM EDT	Special Weather Statement	MLB	Volusia	50 min
May 6, 1:01 PM EDT	Special Marine Warning	MLB		59 min
May 6, 1:16 PM EDT	Special Weather Statement	MLB	Flagler	29 min
May 6, 1:27 PM EDT	Special Weather Statement	MLB	Lake, Volusia	48 min
May 6, 1:36 PM EDT	Special Marine Warning	MLB		84 min
May 6, 1:54 PM EDT	Special Weather Statement	MLB	Lake, Orange	51 min
May 6, 2:00 PM EDT	Special Weather Statement	MLB	Flagler	15 min
May 6, 2:39 PM EDT	Special Marine Warning	MLB		2 hr
May 6, 2:42 PM EDT	Special Weather Statement	MLB	Brevard, Orange, Seminole	48 min
May 6, 3:28 PM EDT	Special Weather Statement	MLB	Brevard	47 min
May 6, 3:33 PM EDT	Special Weather Statement	MLB	Okeechobee	42 min
May 6, 3:49 PM EDT	Special Weather Statement	MLB	Indian River	41 min
May 6, 3:56 PM EDT	Special Weather Statement	MLB	Brevard	34 min
May 6, 5:58 PM EDT	Special Weather Statement	MLB	Martin	47 min
May 6, 6:02 PM EDT	Special Marine Warning	MLB		43 min
May 6, 6:39 PM EDT	Special Marine Warning	MLB		66 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.