Alert archive / Florida / Special Weather Statements in 2021

Special Weather Statement, NWS Melbourne, FL

August 11, 2021Okeechobee County, Florida

NWS Melbourne, FL issued this special weather statement at Aug 11, 2021, 4:43 PM EDT for Okeechobee County, Florida. It was in force for 32 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 11, 2021, 4:43 PM EDT (20:43 UTC)
Expired
Aug 11, 2021, 5:15 PM EDT
In force
32 min
Issued by
NWS Melbourne, FL
Hail
0.00 in
Wind
40

County Okeechobee County, FL

The radar

The Melbourne radar (KMLB), 99 km from the middle of the area, began a volume at 20:44 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, 8.7 hours before the alert went out and 141 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 2021-08-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1854 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 2021-08-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -5 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
1854 J/kg
Mixed-layer CIN
-15 J/kg
Mixed-layer LCL
929 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
-5 m²/s²
0-3 km storm-relative helicity
10 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

711 
WWUS82 KMLB 112043
SPSMLB

Special Weather Statement
National Weather Service Melbourne FL
443 PM EDT Wed Aug 11 2021
 
FLZ058-112115-
Okeechobee FL-
443 PM EDT Wed Aug 11 2021

...A strong thunderstorm will impact portions of southeastern
Okeechobee County through 515 PM EDT...

At 442 PM EDT, Doppler radar was tracking a strong thunderstorm over
Okeechobee, moving west at 10 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...
Treasure Island, Okeechobee, Basinger, Four Seasons Estates and
Taylor Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 2719 8091 2720 8094 2722 8095 2722 8097
      2723 8099 2725 8098 2726 8100 2730 8100
      2730 8103 2732 8103 2733 8105 2735 8103
      2738 8107 2741 8102 2740 8074 2720 8072
      2719 8077 2721 8081 2719 8084 2718 8091
TIME...MOT...LOC 2042Z 087DEG 7KT 2728 8082 

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

$$

KN

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.