Alert archive / Florida / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 34, NWS Melbourne, FL

August 6, 2021Volusia County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Aug 6, 2021, 7:47 PM EDT for Volusia County, Florida. It was in force for 17 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 6, 2021, 7:47 PM EDT (23:47 UTC)
Expired: Aug 6, 2021, 8:04 PM EDT
In force: 17 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

County Volusia County, FL

The radar

The Melbourne radar (KMLB), 111 km from the middle of the area, began a volume at 23:50 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.

The nearest sounding before it

Cape Canaveral, FL (KXMR), launched 12:00Z, 11.8 hours before the alert went out and 93 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: 429 J/kg
Mixed-layer CIN: -44 J/kg
Mixed-layer LCL: 1067 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 39 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

679 
WUUS52 KMLB 062347
SVRMLB
FLC127-070015-
/O.NEW.KMLB.SV.W.0034.210806T2347Z-210807T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Melbourne FL
747 PM EDT Fri Aug 6 2021

The National Weather Service in Melbourne has issued a

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

* Until 815 PM EDT.

* At 746 PM EDT, a severe thunderstorm was located over Orange City,
  and is nearly stationary.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Deltona, DeLand, Orange City, Lake Helen and DeBary. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2901 8131 2897 8118 2886 8125 2888 8136
TIME...MOT...LOC 2346Z 177DEG 4KT 2892 8129 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Sedlock

1 follow-up statement

834 
WWUS52 KMLB 070004
SVSMLB

Severe Weather Statement
National Weather Service Melbourne FL
804 PM EDT Fri Aug 6 2021

FLC127-070013-
/O.CAN.KMLB.SV.W.0034.000000T0000Z-210807T0015Z/
Volusia FL-
804 PM EDT Fri Aug 6 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL VOLUSIA COUNTY IS
CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.  However gusty winds and
heavy rain are still possible with this thunderstorm.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Melbourne.

LAT...LON 2901 8131 2897 8118 2886 8125 2888 8136
TIME...MOT...LOC 0001Z 177DEG 4KT 2894 8129 

$$

Sedlock

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 6, 7:31 PM EDT	Special Weather Statement	MLB	Orange, Seminole	59 min
Aug 6, 7:31 PM EDT	Special Weather Statement	MLB	Volusia	44 min
Aug 6, 7:39 PM EDT	Areal Flood Advisory	MLB	Orange, Seminole	2 hr
Aug 6, 7:40 PM EDT	Areal Flood Advisory	MLB	Volusia	2 hr

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.