Alert archive / Florida / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 27, NWS Melbourne, FL

July 12, 2021Osceola County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Jul 12, 2021, 2:08 PM EDT for Osceola County, Florida. It was in force for 18 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, 2:08 PM EDT (18:08 UTC)
Expired: Jul 12, 2021, 2:26 PM EDT
In force: 18 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), 69 km from the middle of the area, began a volume at 18:09 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, 6.1 hours before the alert went out and 98 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.

632 
WUUS52 KMLB 121808
SVRMLB
FLC097-121900-
/O.NEW.KMLB.SV.W.0027.210712T1808Z-210712T1900Z/

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

The National Weather Service in Melbourne has issued a

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

* Until 300 PM EDT.

* At 207 PM EDT, a severe thunderstorm was located over Lake
  Kissimmee, moving northwest at 20 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Lake Kissimmee.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2806 8144 2801 8138 2804 8136 2807 8137
      2807 8135 2808 8135 2809 8138 2814 8128
      2789 8111 2783 8122 2789 8131 2792 8131
      2794 8135 2795 8134 2798 8138 2800 8139
      2800 8142 2805 8146
TIME...MOT...LOC 1807Z 142DEG 19KT 2791 8123 

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

Watson

1 follow-up statement

354 
WWUS52 KMLB 121826
SVSMLB

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

FLC097-121835-
/O.CAN.KMLB.SV.W.0027.000000T0000Z-210712T1900Z/
Osceola FL-
226 PM EDT Mon Jul 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR 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.

LAT...LON 2806 8144 2801 8138 2804 8136 2807 8137
      2807 8135 2808 8135 2809 8138 2814 8128
      2789 8111 2783 8122 2789 8131 2792 8131
      2794 8135 2795 8134 2798 8138 2800 8139
      2800 8142 2805 8146
TIME...MOT...LOC 1822Z 142DEG 19KT 2799 8130 

$$

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, 2:10 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, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.