Alert archive / Florida / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 28, NWS Melbourne, FL

July 12, 2021Osceola County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Jul 12, 2021, 2:41 PM EDT for Osceola County, Florida. It was in force for 38 min. 2 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: Jul 12, 2021, 2:41 PM EDT (18:41 UTC)
Expired: Jul 12, 2021, 3:19 PM EDT
In force: 38 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Osceola County, FL

The radar

The Melbourne radar (KMLB), 66 km from the middle of the area, began a volume at 18:42 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, 2:42 PM EDT	TSTM WND GST 52	6 Sse West Lake Toho, FL	SFWMD STATION AT LAKE TOHOPEKALIGA MEASURED A WIND GUST OF 45KT/52MPH FROM THE SOUTHEAST.
Jul 12, 2:47 PM EDT	HAIL 0.88	Saint Cloud, FL	MEMBER OF EMERGENCY MANAGEMENT REPORTS HAIL UP TO NICKEL SIZE NEAR SAINT CLOUD.

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 83 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.

302 
WUUS52 KMLB 121841
SVRMLB
FLC097-121930-
/O.NEW.KMLB.SV.W.0028.210712T1841Z-210712T1930Z/

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

The National Weather Service in Melbourne has issued a

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

* Until 330 PM EDT.

* At 241 PM EDT, a severe thunderstorm was located near West Lake
  Toho, moving north at 35 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Kissimmee, Saint Cloud, Buena Ventura Lakes, East Lake Toho and
  Narcoossee.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2835 8121 2810 8128 2810 8140 2835 8143
TIME...MOT...LOC 1841Z 180DEG 29KT 2817 8133 

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

KN

2 follow-up statements

283 
WWUS52 KMLB 121852
SVSMLB

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

FLC097-121930-
/O.CON.KMLB.SV.W.0028.000000T0000Z-210712T1930Z/
Osceola FL-
252 PM EDT Mon Jul 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EDT
FOR NORTH CENTRAL OSCEOLA COUNTY...

At 250 PM EDT, a severe thunderstorm was located over Saint Cloud,
moving north at 35 mph.

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

SOURCE...Radar indicated. At 247 pm, nickel size hail was reported 
         in Saint Cloud. 

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

Locations impacted include...
Kissimmee, Saint Cloud, Buena Ventura Lakes, East Lake Toho and
Narcoossee.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2817 8126 2818 8141 2835 8143 2835 8121
TIME...MOT...LOC 1850Z 180DEG 29KT 2825 8133 

HAIL...0.88IN
WIND...60MPH
 
$$

KN

225 
WWUS52 KMLB 121919
SVSMLB

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

FLC097-121929-
/O.CAN.KMLB.SV.W.0028.000000T0000Z-210712T1930Z/
Osceola FL-
319 PM EDT Mon Jul 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL OSCEOLA COUNTY
IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.  However small hail and
gusty winds are still possible with this thunderstorm.

LAT...LON 2817 8126 2818 8141 2835 8143 2835 8121
TIME...MOT...LOC 1918Z 180DEG 29KT 2849 8133 

$$

KN

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, 2:48 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

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.