Alert archive / Florida / Special Weather Statements in 2021

Special Weather Statement, NWS Melbourne, FL

July 20, 2021Saint Lucie County, Florida

NWS Melbourne, FL issued this special weather statement at Jul 20, 2021, 2:40 PM EDT for Saint Lucie County, Florida. It was in force for 50 min. 1 report 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: Jul 20, 2021, 2:40 PM EDT (18:40 UTC)
Expired: Jul 20, 2021, 3:30 PM EDT
In force: 50 min
Issued by: NWS Melbourne, FL

County Saint Lucie County, FL

The radar

The Melbourne radar (KMLB), 76 km from the middle of the area, began a volume at 18:41 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
Jul 20, 2:51 PM EDT	TSTM WND GST 46	5 Nw Fort Pierce, FL	ASOS AT TREASURE COAST INTERNATIONAL AIRPORT IN FORT PIERCE, KFPR, MEASURED A PEAK WIND GUST OF 40KT/46MPH FROM THE SOUTHWEST.

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, 6.7 hours before the alert went out and 111 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: 598 J/kg
Mixed-layer CIN: -60 J/kg
Mixed-layer LCL: 1133 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: -8 m²/s²
0-3 km storm-relative helicity: 11 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

476 
WWUS82 KMLB 201840
SPSMLB

Special Weather Statement
National Weather Service Melbourne FL
240 PM EDT Tue Jul 20 2021
 
FLZ054-059-201930-
St. Lucie FL-Indian River FL-
240 PM EDT Tue Jul 20 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN ST. LUCIE AND
SOUTHEASTERN INDIAN RIVER COUNTIES UNTIL 330 PM EDT...

At 239 PM EDT, Doppler radar was tracking a strong thunderstorm over
Fort Pierce North, or near Fort Pierce, moving north at 20 mph.

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

Locations impacted include...
Fort Pierce, Vero Beach, Vero Beach South, Fort Pierce Inlet and
Indrio.

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.

&&

LAT...LON 2737 8031 2742 8045 2766 8061 2764 8031
      2743 8023
TIME...MOT...LOC 1839Z 183DEG 17KT 2745 8037 

$$

Fehling

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 2:10 PM EDT	Special Marine Warning	MLB		65 min
Jul 20, 3:13 PM EDT	Special Marine Warning	MLB		62 min
Jul 20, 6:29 PM EDT	Areal Flood Advisory	MLB	Volusia	91 min
Jul 20, 6:44 PM EDT	Special Marine Warning	MLB		2 hr
Jul 20, 7:31 PM EDT	Areal Flood Advisory	MLB	Orange, Seminole	89 min
Jul 20, 7:42 PM EDT	Special Weather Statement	MLB	Orange, Seminole	48 min
Jul 20, 7:55 PM EDT	Areal Flood Advisory	MLB	Seminole, Volusia	95 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.