Alert archive / Florida / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 13, NWS Melbourne, FL

April 20, 2020Osceola County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Apr 20, 2020, 1:05 PM EDT for Osceola County, Florida. It was in force for 55 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: Apr 20, 2020, 1:05 PM EDT (17:05 UTC)
Expired: Apr 20, 2020, 2:00 PM EDT
In force: 55 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), 70 km from the middle of the area, began a volume at 17:06 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 20, 7:02 AM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Cape Canaveral, FL (KXMR), launched 12:00Z, 5.1 hours before the alert went out and 94 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: 2398 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 793 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 224 m²/s²
0-3 km storm-relative helicity: 268 m²/s²
Significant tornado parameter: 4.0
Supercell composite: 18.3

Open this sounding in Storm Lab

The text

As transmitted.

190 
WUUS52 KMLB 201705
SVRMLB
FLC097-201800-
/O.NEW.KMLB.SV.W.0013.200420T1705Z-200420T1800Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Melbourne FL
105 PM EDT Mon Apr 20 2020

The National Weather Service in Melbourne has issued a

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

* Until 200 PM EDT.

* At 104 PM EDT, a severe thunderstorm was located over Poinciana, or
  near Intercession City, moving east at 40 to 45 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, Celebration, Holopaw and West Lake Toho. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Intense thunderstorm lines can produce brief tornadoes and widespread
significant wind damage. Although a tornado is not immediately
likely, it is best to move to an interior room on the lowest floor of
a building. This storm may cause serious injury and significant
property damage.

Damaging winds and continuous cloud to ground lightning is occurring 
with this storm. Move indoors immediately. Lightning is one of 
nature's leading killers. Remember, if you can hear thunder, you are 
close enough to be struck by lightning.

&&

LAT...LON 2833 8087 2797 8087 2796 8135 2800 8139
      2800 8142 2805 8146 2806 8146 2806 8144
      2801 8138 2804 8136 2807 8137 2807 8135
      2808 8135 2809 8145 2814 8146 2814 8152
      2820 8152 2826 8156 2826 8166 2834 8166
TIME...MOT...LOC 1704Z 271DEG 37KT 2817 8150 

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

Sedlock

2 follow-up statements

081 
WWUS52 KMLB 201734
SVSMLB

Severe Weather Statement
National Weather Service Melbourne FL
134 PM EDT Mon Apr 20 2020

FLC097-201800-
/O.CON.KMLB.SV.W.0013.000000T0000Z-200420T1800Z/
Osceola FL-
134 PM EDT Mon Apr 20 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 PM EDT
FOR OSCEOLA COUNTY...

At 132 PM EDT, a severe thunderstorm cluster was located near 
Harmony, and back towards the Osceola County and Polk County border, 
moving east 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, Celebration, Holopaw and West Lake Toho. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Frequent cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 2833 8087 2797 8087 2796 8135 2800 8139
      2800 8142 2805 8146 2806 8146 2806 8144
      2801 8138 2804 8136 2807 8137 2807 8135
      2808 8135 2809 8145 2814 8146 2814 8152
      2820 8152 2826 8156 2826 8166 2834 8166
TIME...MOT...LOC 1732Z 269DEG 30KT 2816 8124 

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

Sedlock

798 
WWUS52 KMLB 201758
SVSMLB

Severe Weather Statement
National Weather Service Melbourne FL
158 PM EDT Mon Apr 20 2020

FLC097-201808-
/O.EXP.KMLB.SV.W.0013.000000T0000Z-200420T1800Z/
Osceola FL-
158 PM EDT Mon Apr 20 2020

...THE SEVERE THUNDERSTORM WARNING FOR OSCEOLA COUNTY WILL EXPIRE AT
200 PM EDT...
                
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 will be allowed to expire.  However gusty
winds and heavy rain are still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 300 PM EDT for
east central Florida.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Melbourne.

LAT...LON 2833 8087 2797 8087 2796 8135 2800 8139
      2800 8142 2805 8146 2806 8146 2806 8144
      2801 8138 2804 8136 2807 8137 2807 8135
      2808 8135 2809 8145 2814 8146 2814 8152
      2820 8152 2826 8156 2826 8166 2834 8166
TIME...MOT...LOC 1758Z 271DEG 37KT 2816 8095 

$$

Sedlock

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 20, 3:06 AM EDT	Lake Wind Advisory	MLB	Lake, Okeechobee, Orange, Osceola, Seminole, Volusia	17 hr
Apr 20, 9:41 AM EDT	Special Weather Statement	MLB	Volusia	64 min
Apr 20, 10:12 AM EDT	Severe Thunderstorm Warning	MLB	Lake, Volusia	63 min
Apr 20, 10:32 AM EDT	Special Weather Statement	MLB	Lake	43 min
Apr 20, 10:38 AM EDT	Special Marine Warning	MLB		119 min
Apr 20, 10:42 AM EDT	Severe Thunderstorm Warning	MLB	Lake, Orange, Seminole, Volusia	63 min
Apr 20, 10:49 AM EDT	Tornado Warning	MLB	Volusia	26 min
Apr 20, 11:06 AM EDT	Tornado Warning	MLB	Lake, Orange, Seminole	24 min
Apr 20, 11:10 AM EDT	Severe Thunderstorm Warning	MLB	Seminole, Volusia	50 min
Apr 20, 11:13 AM EDT	Tornado Warning	MLB	Volusia	32 min
Apr 20, 11:28 AM EDT	Tornado Warning	MLB	Orange, Seminole	32 min
Apr 20, 11:32 AM EDT	Special Marine Warning	MLB		2 hr
Apr 20, 11:44 AM EDT	Severe Thunderstorm Warning	MLB	Brevard, Seminole, Volusia	46 min
Apr 20, 11:48 AM EDT	Tornado Warning Tornado observed	MLB	Brevard, Seminole, Volusia	42 min
Apr 20, 11:59 AM EDT	Tornado Warning	MLB	Brevard	31 min
Apr 20, 12:14 PM EDT	Tornado Warning	MLB	Brevard	31 min
Apr 20, 12:16 PM EDT	Tornado Warning	MLB	Brevard	29 min
Apr 20, 12:56 PM EDT	Special Weather Statement	MLB	Osceola	64 min
Apr 20, 1:52 PM EDT	Special Weather Statement	MLB	Brevard	53 min
Apr 20, 1:56 PM EDT	Special Marine Warning	MLB		68 min
Apr 20, 2:43 PM EDT	Special Weather Statement	MLB	Osceola	47 min
Apr 20, 3:02 PM EDT	Special Weather Statement	MLB	Okeechobee	58 min
Apr 20, 4:40 PM EDT	Special Marine Warning	MLB		2 hr
Apr 20, 4:44 PM EDT	Special Weather Statement	MLB	Okeechobee	46 min
Apr 20, 5:06 PM EDT	Special Weather Statement	MLB	Martin	39 min
Apr 20, 5:16 PM EDT	Severe Thunderstorm Warning	MLB	Martin, Saint Lucie	33 min
Apr 20, 5:21 PM EDT	Tornado Warning	MLB	Martin	24 min
Apr 20, 5:41 PM EDT	Special Marine Warning	MLB		49 min

Nearby

Severe Thunderstorm Warnings in Florida, 2020 Every severe thunderstorm warning in 2020

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.