Alert archive / Florida / Special Weather Statements in 2021

Special Weather Statement, NWS Melbourne, FL

September 7, 2021Seminole County, Florida

NWS Melbourne, FL issued this special weather statement at Sep 7, 2021, 5:13 PM EDT for Seminole County, Florida. It was in force for 62 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
Sep 7, 2021, 5:13 PM EDT (21:13 UTC)
Expired
Sep 7, 2021, 6:15 PM EDT
In force
62 min
Issued by
NWS Melbourne, FL
Hail
0.00 in
Wind
40

County Seminole County, FL

The radar

The Melbourne radar (KMLB), 63 km from the middle of the area, began a volume at 21:14 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, 9.2 hours before the alert went out and 48 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 2021-09-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1096 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 2021-09-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -27 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
1096 J/kg
Mixed-layer CIN
-25 J/kg
Mixed-layer LCL
950 m above ground
0-6 km bulk shear
6 kt
0-1 km storm-relative helicity
-27 m²/s²
0-3 km storm-relative helicity
-28 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

197 
WWUS82 KMLB 072113
SPSMLB

Special Weather Statement
National Weather Service Melbourne FL
513 PM EDT Tue Sep 7 2021
 
FLZ041-045-046-147-072215-
Northern Brevard County FL-Orange FL-Seminole FL-Inland Volusia FL-
513 PM EDT Tue Sep 7 2021

...A strong thunderstorm will impact portions of southeastern 
Seminole, northwestern Brevard, eastern Orange and southeastern 
Volusia Counties through 615 PM EDT...

At 512 PM EDT, Doppler radar was tracking a strong thunderstorm near 
Titusville, moving southeast at 5 mph. Additional thunderstorms are 
expected to develop along the sea breeze and outflow boundary 
interaction.

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...
Titusville, Cocoa, Wedgefield, Port Saint John and Christmas. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

&&

LAT...LON 2876 8110 2876 8084 2839 8073 2839 8107
TIME...MOT...LOC 2112Z 324DEG 6KT 2858 8088 

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

$$

Smith

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 7, 3:14 AM EDTRip Current StatementMLBVolusia6 days
Sep 7, 5:43 PM EDTSevere Thunderstorm WarningMLBBrevard, Orange28 min
Sep 7, 6:32 PM EDTSpecial Weather StatementMLBOrange43 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.