Alert archive / Florida / Special Weather Statements in 2021

Special Weather Statement, NWS Melbourne, FL

August 7, 2021Volusia County, Florida

NWS Melbourne, FL issued this special weather statement at Aug 7, 2021, 5:51 PM EDT for Volusia County, Florida. It was in force for 24 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 7, 2021, 5:51 PM EDT (21:51 UTC)
Expired
Aug 7, 2021, 6:15 PM EDT
In force
24 min
Issued by
NWS Melbourne, FL
Hail
0.00 in
Wind
40

County Volusia County, FL

The radar

The Melbourne radar (KMLB), 127 km from the middle of the area, began a volume at 21:54 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, 9.9 hours before the alert went out and 100 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 2021-08-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 725 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 2021-08-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 46 square meters per square second.1939Sfc1 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
725 J/kg
Mixed-layer CIN
-65 J/kg
Mixed-layer LCL
1093 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
46 m²/s²
0-3 km storm-relative helicity
59 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

296 
WWUS82 KMLB 072151
SPSMLB

Special Weather Statement
National Weather Service Melbourne FL
551 PM EDT Sat Aug 7 2021
 
FLZ041-141-072215-
Coastal Volusia FL-Inland Volusia FL-
551 PM EDT Sat Aug 7 2021

...Strong thunderstorms will impact portions of central Volusia
County through 615 PM EDT...

At 550 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from 6 miles west of Ormond Beach to 8 miles
southwest of Daytona International Speedway to Orange City. Movement
was northeast at 15 mph.

HAZARD...Winds in excess of 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around 
         unsecured objects.

Locations impacted include...
Deltona, Daytona Beach, Port Orange, Ormond Beach and DeLand. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

&&

LAT...LON 2931 8107 2910 8099 2891 8103 2887 8133
      2926 8133 2927 8115 2932 8115
TIME...MOT...LOC 2150Z 244DEG 15KT 2926 8117 2908 8114 2892 8130 

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

$$

Sedlock

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 7, 4:18 PM EDTSpecial Weather StatementMLBOrange42 min
Aug 7, 5:17 PM EDTSpecial Weather StatementMLBLake43 min
Aug 7, 6:30 PM EDTSpecial Marine WarningMLB2 hr
Aug 7, 6:41 PM EDTSpecial Weather StatementMLBBrevard49 min
Aug 7, 6:45 PM EDTSpecial Weather StatementMLBOsceola45 min
Aug 7, 7:23 PM EDTSpecial Weather StatementMLBBrevard37 min

Nearby

Special Weather Statements in Florida, 2021Every special weather statement 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.