Alert archive / Florida / Special Weather Statements in 2021

Special Weather Statement, NWS Melbourne, FL

August 7, 2021Lake County, Florida

NWS Melbourne, FL issued this special weather statement at Aug 7, 2021, 5:17 PM EDT for Lake County, Florida. It was in force for 43 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, 5:17 PM EDT (21:17 UTC)
Expired
Aug 7, 2021, 6:00 PM EDT
In force
43 min
Issued by
NWS Melbourne, FL
Hail
0.00 in
Wind
50

County Lake County, FL

The radar

The Melbourne radar (KMLB), 110 km from the middle of the area, began a volume at 21:20 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, 9.3 hours before the alert went out and 105 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.

245 
WWUS82 KMLB 072117
SPSMLB

Special Weather Statement
National Weather Service Melbourne FL
517 PM EDT Sat Aug 7 2021
 
FLZ044>046-072200-
Northern Lake County FL-Orange FL-Seminole FL-
517 PM EDT Sat Aug 7 2021

...A strong thunderstorm will impact portions of west central
Seminole and northwestern Orange Counties through 600 PM EDT...

At 517 PM EDT, Doppler radar was tracking a strong thunderstorm over 
Zellwood, moving east at 15 mph. Another strong storm was located 
just east of Rock Springs.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Radar indicated.

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

Locations impacted include...
Apopka, Lake Mary, Mount Plymouth, Zellwood and Wekiwa Springs State
Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

&&

LAT...LON 2864 8161 2876 8164 2884 8146 2875 8134
TIME...MOT...LOC 2117Z 256DEG 11KT 2874 8158 

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 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, 5:51 PM EDTSpecial Weather StatementMLBVolusia24 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.