Alert archive / Florida / Special Weather Statements in 2021

Special Weather Statement, NWS Melbourne, FL

April 11, 2021Indian River County, Okeechobee County, Florida

NWS Melbourne, FL issued this special weather statement at Apr 11, 2021, 1:13 PM EDT for Indian River County, Okeechobee County, Florida. It was in force for 62 min. 4 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Apr 11, 2021, 1:13 PM EDT (17:13 UTC)
Expired: Apr 11, 2021, 2:15 PM EDT
In force: 62 min
Issued by: NWS Melbourne, FL

Counties Indian River County, FL, Okeechobee County, FL

The radar

The Melbourne radar (KMLB), 85 km from the middle of the area, began a volume at 17:13 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.

What was reported inside it

Time	Report	Where	Remark
Apr 11, 1:44 PM EDT	TSTM WND GST 52	4 Nnw Grant, FL	WEATHERFLOW SITE XRPT AT ROCKY POINT MEASURED A PEAK WIND GUST OF 52MPH OR 45KT FROM THE NORTH.
Apr 11, 2:00 PM EDT	TSTM WND GST 47	6 S Basinger, FL	SFWMD MESONET ON THE KISSIMMEE RIVER SOUTH OF BASINGER MEASURED A PEAK WIND GUST OF 47MPH.
Apr 11, 2:09 PM EDT	TSTM WND GST 52	Vero Beach Airport, FL	ASOS AT VERO BEACH MUNICIPAL AIRPORT MEASURED A PEAK WIND GUST OF 45 KNOTS/52 MPH FROM THE NW.
Apr 11, 2:15 PM EDT	TSTM WND GST 45	5 Sse Barefoot Bay, FL	SEBASTIAN MUNICIPAL AIRPORT X26 MEASURED A PEAK WIND GUST OF 39KT/46MPH FROM THE NNW.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Cape Canaveral, FL (KXMR), launched 12:00Z, 5.2 hours before the alert went out and 127 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: 449 J/kg
Mixed-layer CIN: -181 J/kg
Mixed-layer LCL: 1002 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 202 m²/s²
0-3 km storm-relative helicity: 199 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

The text

As transmitted.

151 
WWUS82 KMLB 111713
SPSMLB

Special Weather Statement
National Weather Service Melbourne FL
113 PM EDT Sun Apr 11 2021
 
FLZ047-053-054-058-059-111815-
St. Lucie FL-Okeechobee FL-Southern Brevard County FL-Osceola FL-
Indian River FL-
113 PM EDT Sun Apr 11 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN ST. LUCIE...
OKEECHOBEE...INDIAN RIVER...SOUTHEASTERN BREVARD AND SOUTHEASTERN
OSCEOLA COUNTIES UNTIL 215 PM EDT...

At 113 PM EDT, Doppler radar was tracking a strong thunderstorm near
Fort Drum, moving northeast at 35 mph.

Pea size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Palm Bay, Sebastian, Vero Beach, Treasure Island and Okeechobee. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

A Severe Thunderstorm Watch remains in effect until 400 PM EDT for
east central Florida.

LAT...LON 2717 8091 2719 8091 2723 8099 2730 8100
      2730 8103 2733 8105 2736 8103 2738 8107
      2739 8112 2745 8115 2749 8120 2753 8121
      2760 8114 2766 8113 2769 8115 2808 8053
      2758 8030 2720 8078 2720 8083 2714 8087
TIME...MOT...LOC 1713Z 234DEG 30KT 2758 8080 

$$

Smith

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 11, 4:31 AM EDT	Special Weather Statement	MLB	Flagler	44 min
Apr 11, 7:38 AM EDT	Special Marine Warning	MLB		2 hr
Apr 11, 7:43 AM EDT	Special Weather Statement	MLB	Volusia	62 min
Apr 11, 8:45 AM EDT	Special Weather Statement	MLB	Volusia	45 min
Apr 11, 9:19 AM EDT	Special Marine Warning	MLB		26 min
Apr 11, 9:45 AM EDT	Special Weather Statement	MLB	Lake	60 min
Apr 11, 10:35 AM EDT	Severe Thunderstorm Warning	MLB	Orange, Seminole	23 min
Apr 11, 10:56 AM EDT	Severe Thunderstorm Warning	MLB	Seminole, Volusia	30 min
Apr 11, 11:01 AM EDT	Special Weather Statement	MLB	Lake	44 min
Apr 11, 11:05 AM EDT	Special Weather Statement	MLB	Seminole	10 min
Apr 11, 11:29 AM EDT	Special Marine Warning	MLB		2 hr
Apr 11, 11:31 AM EDT	Special Weather Statement	MLB	Seminole, Volusia	44 min
Apr 11, 11:39 AM EDT	Special Weather Statement	MLB	Lake, Orange	66 min
Apr 11, 11:45 AM EDT	Special Weather Statement	MLB	Volusia	60 min
Apr 11, 12:23 PM EDT	Severe Thunderstorm Warning	MLB	Lake, Orange, Osceola	52 min
Apr 11, 12:39 PM EDT	Special Weather Statement	MLB	Brevard, Osceola	66 min
Apr 11, 1:04 PM EDT	Special Weather Statement	MLB	Seminole	41 min
Apr 11, 1:08 PM EDT	Special Marine Warning	MLB		3 hr
Apr 11, 1:55 PM EDT	Severe Thunderstorm Warning	MLB	Brevard, Indian River	36 min
Apr 11, 2:11 PM EDT	Special Weather Statement	MLB	Indian River, Martin, Okeechobee, Saint Lucie	94 min
Apr 11, 2:17 PM EDT	Severe Thunderstorm Warning	MLB	Indian River, Martin, Okeechobee, Saint Lucie	58 min

Nearby

Special Weather Statements in Florida, 2021 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.