Alert archive / Florida / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 29, NWS Melbourne, FL

July 12, 2021Orange County, Osceola County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Jul 12, 2021, 4:38 PM EDT for Orange County, Osceola County, Florida. It was in force for 22 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 12, 2021, 4:38 PM EDT (20:38 UTC)
Expired: Jul 12, 2021, 5:00 PM EDT
In force: 22 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Orange County, FL, Osceola County, FL

The radar

The Melbourne radar (KMLB), 60 km from the middle of the area, began a volume at 20:40 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 12, 4:46 PM EDT	TSTM WND GST 45	5 Nne East Lake Toho, FL	WEATHERSTEM STATION AT LAKE NONA MIDDLE SCHOOL MEASURED A WIND GUST OF 39KT/45MPH 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, 8.6 hours before the alert went out and 70 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.

998 
WUUS52 KMLB 122038
SVRMLB
FLC095-097-122145-
/O.NEW.KMLB.SV.W.0029.210712T2038Z-210712T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Melbourne FL
438 PM EDT Mon Jul 12 2021

The National Weather Service in Melbourne has issued a

* Severe Thunderstorm Warning for...
  South central Orange County in east central Florida...
  North central Osceola County in east central Florida...

* Until 545 PM EDT.

* At 438 PM EDT, a severe thunderstorm was located near Narcoossee,
  moving northwest at 15 mph.

  HAZARD...60 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Orlando, Kissimmee, Orlando International Airport, Buena Ventura
  Lakes and East Lake Toho.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 2833 8109 2823 8122 2835 8144 2853 8120
TIME...MOT...LOC 2038Z 135DEG 12KT 2829 8116 

HAIL...0.75IN
WIND...60MPH
 
$$

Fehling

1 follow-up statement

096 
WWUS52 KMLB 122100
SVSMLB

Severe Weather Statement
National Weather Service Melbourne FL
500 PM EDT Mon Jul 12 2021

FLC095-097-122110-
/O.CAN.KMLB.SV.W.0029.000000T0000Z-210712T2145Z/
Orange FL-Osceola FL-
500 PM EDT Mon Jul 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL ORANGE AND NORTH
CENTRAL OSCEOLA COUNTIES IS CANCELLED...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been cancelled.  However gusty winds are still possible with this
thunderstorm.

LAT...LON 2833 8109 2823 8122 2835 8144 2853 8120
TIME...MOT...LOC 2058Z 135DEG 12KT 2834 8122 

$$

Fehling

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, 2:21 PM EDT	Special Weather Statement	MLB	Okeechobee	39 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, 6:49 PM EDT	Special Weather Statement	MLB	Seminole	41 min

Nearby

Severe Thunderstorm Warnings in Florida, 2021 Every severe thunderstorm warning 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.