Alert archive / Florida / Special Weather Statements in 2021

Special Weather Statement, NWS Melbourne, FL

July 12, 2021Okeechobee County, Florida

NWS Melbourne, FL issued this special weather statement at Jul 12, 2021, 2:21 PM EDT for Okeechobee County, Florida. It was in force for 39 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: Jul 12, 2021, 2:21 PM EDT (18:21 UTC)
Expired: Jul 12, 2021, 3:00 PM EDT
In force: 39 min
Issued by: NWS Melbourne, FL

County Okeechobee County, FL

The radar

The Melbourne radar (KMLB), 103 km from the middle of the area, began a volume at 18:20 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, 6.4 hours before the alert went out and 144 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: 2593 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 888 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 5 m²/s²
0-3 km storm-relative helicity: -19 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

238 
WWUS82 KMLB 121821
SPSMLB

Special Weather Statement
National Weather Service Melbourne FL
221 PM EDT Mon Jul 12 2021
 
FLZ058-059-064-121900-
St. Lucie FL-Okeechobee FL-Martin FL-
221 PM EDT Mon Jul 12 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN ST. LUCIE...
SOUTHEASTERN OKEECHOBEE AND NORTHWESTERN MARTIN COUNTIES UNTIL 300 PM
EDT...

At 220 PM EDT, Doppler radar was tracking a strong thunderstorm near
J And S Fish Camp, moving northwest at 20 mph.

Wind gusts up to 50 mph will be possible with this storm.

Locations impacted include...
Treasure Island, Okeechobee, J And S Fish Camp, Four Seasons Estates
and Taylor Creek.

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.

&&

LAT...LON 2709 8066 2711 8066 2712 8068 2716 8071
      2718 8074 2721 8079 2721 8081 2720 8083
      2727 8094 2747 8071 2725 8044 2706 8062
TIME...MOT...LOC 1820Z 130DEG 16KT 2718 8063 

$$

Watson

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 12:51 PM EDT	Special Weather Statement	MLB	Volusia	39 min
Jul 12, 12:55 PM EDT	Special Weather Statement	MLB	Okeechobee	50 min
Jul 12, 1:14 PM EDT	Special Weather Statement	MLB	Lake	46 min
Jul 12, 1:15 PM EDT	Special Weather Statement	MLB	Flagler	45 min
Jul 12, 1:30 PM EDT	Special Marine Warning	MLB		45 min
Jul 12, 1:35 PM EDT	Special Weather Statement	MLB	Martin	40 min
Jul 12, 1:45 PM EDT	Special Weather Statement	MLB	Osceola	30 min
Jul 12, 1:51 PM EDT	Severe Thunderstorm Warning	MLB	Martin	39 min
Jul 12, 1:58 PM EDT	Special Weather Statement	MLB	Martin	47 min
Jul 12, 2:02 PM EDT	Special Weather Statement	MLB	Lake	43 min
Jul 12, 2:08 PM EDT	Severe Thunderstorm Warning	MLB	Osceola	18 min
Jul 12, 2:10 PM EDT	Special Weather Statement	MLB	Orange	50 min
Jul 12, 2:33 PM EDT	Special Weather Statement	MLB	Osceola	42 min
Jul 12, 2:38 PM EDT	Special Weather Statement	MLB	Martin	52 min
Jul 12, 2:41 PM EDT	Severe Thunderstorm Warning	MLB	Osceola	38 min
Jul 12, 2:48 PM EDT	Special Weather Statement	MLB	Lake	27 min
Jul 12, 3:12 PM EDT	Special Weather Statement	MLB	Okeechobee	33 min
Jul 12, 3:18 PM EDT	Special Weather Statement	MLB	Orange	42 min
Jul 12, 3:44 PM EDT	Special Weather Statement	MLB	Osceola	46 min
Jul 12, 4:21 PM EDT	Special Weather Statement	MLB	Orange	39 min
Jul 12, 4:38 PM EDT	Severe Thunderstorm Warning	MLB	Orange, Osceola	22 min
Jul 12, 6:49 PM EDT	Special Weather Statement	MLB	Seminole	41 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.