Alert archive / Florida / Special Weather Statements in 2021

Special Weather Statement, NWS Melbourne, FL

September 19, 2021Orange County, Florida

NWS Melbourne, FL issued this special weather statement at Sep 19, 2021, 4:49 PM EDT for Orange County, Florida. It was in force for 26 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: Sep 19, 2021, 4:49 PM EDT (20:49 UTC)
Expired: Sep 19, 2021, 5:15 PM EDT
In force: 26 min
Issued by: NWS Melbourne, FL
Hail: 0.00 in
Wind: 40
Spout: Possible

County Orange County, FL

The radar

The Melbourne radar (KMLB), 72 km from the middle of the area, began a volume at 20:53 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, 8.8 hours before the alert went out and 69 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: 1110 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 850 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 18 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

649 
WWUS82 KMLB 192049
SPSMLB

Special Weather Statement
National Weather Service Melbourne FL
449 PM EDT Sun Sep 19 2021
 
FLZ045-192115-
Orange FL-
449 PM EDT Sun Sep 19 2021

...A strong thunderstorm will impact portions of central Orange
County through 515 PM EDT...

At 448 PM EDT, Doppler radar was tracking a strong thunderstorm
capable of producing a landspout over Union Park, or near Avalon
Park. This storm was nearly stationary.

HAZARD...Landspouts and winds in excess of 40 mph.

SOURCE...Radar indicated.

IMPACT...Minor damage to outdoor objects is possible. Gusty winds 
         could knock down tree limbs and blow around unsecured 
         objects.

Locations impacted include...
Wedgefield, Avalon Park, University Of Central Florida, Bithlo and
Union Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

Conditions are favorable for the development of weak, brief funnel
clouds. These types of funnel clouds are harmless, but on rare
occasions they can briefly touch down, producing wind gusts over 50
mph. If a funnel cloud is spotted move indoors and report your
sighting to the National Weather Service.

&&

LAT...LON 2850 8126 2861 8124 2861 8111 2850 8112
TIME...MOT...LOC 2048Z 290DEG 3KT 2854 8120 

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

$$

Rodriguez

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 19, 4:09 PM EDT	Areal Flood Advisory	MLB	Volusia	81 min
Sep 19, 4:26 PM EDT	Areal Flood Advisory	MLB	Volusia	64 min
Sep 19, 5:19 PM EDT	Areal Flood Advisory	MLB	Orange, Seminole, Volusia	116 min
Sep 19, 5:39 PM EDT	Areal Flood Warning	MLB	Seminole, Volusia	28 min
Sep 19, 6:07 PM EDT	Flash Flood Warning Considerable damage threat	MLB	Seminole	2 hr
Sep 19, 6:14 PM EDT	Special Weather Statement	MLB	Osceola	31 min
Sep 19, 6:46 PM EDT	Areal Flood Advisory	MLB	Orange, Osceola	119 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.