Alert archive / Florida / Tornado Warnings in 2018

Tornado Warning 12, NWS Melbourne, FL

December 20, 2018Orange County, Florida

NWS Melbourne, FL issued this tornado warning at Dec 20, 2018, 9:25 AM EST for Orange County, Florida. It was in force for 35 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: Dec 20, 2018, 9:25 AM EST (14:25 UTC)
Expired: Dec 20, 2018, 10:00 AM EST
In force: 35 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

County Orange County, FL

The radar

The Melbourne radar (KMLB), 92 km from the middle of the area, began a volume at 14:29 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
Dec 20, 7:55 AM EST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Cape Canaveral, FL (KXMR), launched 12:00Z, 2.4 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: 326 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 778 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 174 m²/s²
0-3 km storm-relative helicity: 231 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.4

Open this sounding in Storm Lab

The text

As transmitted.

731 
WFUS52 KMLB 201425
TORMLB
FLC095-201500-
/O.NEW.KMLB.TO.W.0012.181220T1425Z-181220T1500Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Melbourne FL
925 AM EST THU DEC 20 2018

The National Weather Service in Melbourne has issued a

* Tornado Warning for...
  Southwestern Orange County in east central Florida...

* Until 1000 AM EST.

* At 924 AM EST, severe thunderstorms capable of producing both 
  tornadoes and straight line wind damage were located over 
  Celebration, moving northeast at 50 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* These dangerous storms will be near...
  Sea World around 930 AM EST.
  Oak Ridge, Universal Studios and Wet N Wild Water Park around 940 
  AM EST.
  College Park, Conway and Belle Isle around 950 AM EST.
  Winter Park around 1000 AM EST.

Other locations impacted by this tornadic thunderstorm include
Edgewood.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to an interior room on the lowest floor of a
sturdy building. Avoid windows. If you are outdoors, in a mobile
home, or in a vehicle, move to the closest substantial shelter and
protect yourself from flying debris.

This cluster of thunderstorms is capable of producing tornadoes and
widespread significant wind damage. Do not wait to see or hear the
tornado. For your protection move to an interior room on the lowest
floor of a building.

&&

LAT...LON 2860 8148 2859 8125 2835 8147 2835 8166
      2836 8166
TIME...MOT...LOC 1424Z 214DEG 35KT 2835 8155 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

Cristaldi

2 follow-up statements

915 
WWUS52 KMLB 201436
SVSMLB

Severe Weather Statement
National Weather Service Melbourne FL
936 AM EST THU DEC 20 2018

FLC095-201500-
/O.CON.KMLB.TO.W.0012.000000T0000Z-181220T1500Z/
Orange FL-
936 AM EST THU DEC 20 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1000 AM EST FOR
SOUTHWESTERN ORANGE COUNTY...

At 935 AM EST, a severe squall line capable of producing both 
tornadoes and straight line wind damage was located over Doctor 
Phillips, or near Windermere, moving northeast at 45 to 50 mph.

HAZARD...Tornado.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

These dangerous storms will be near...
  Pine Hills, College Park and Orlovista around 950 AM EST.
  Winter Park around 1000 AM EST.

Other locations impacted by this tornadic thunderstorm include
Edgewood.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to an interior room on the lowest floor of a
sturdy building. Avoid windows. If you are outdoors, in a mobile
home, or in a vehicle, move to the closest substantial shelter and
protect yourself from flying debris.

This cluster of thunderstorms is capable of producing tornadoes and
widespread significant wind damage. Do not wait to see or hear the
tornado. For your protection move to an interior room on the lowest
floor of a building.

&&

LAT...LON 2860 8148 2859 8125 2835 8147 2835 8155
      2849 8156
TIME...MOT...LOC 1435Z 206DEG 34KT 2845 8150 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

Cristaldi

984 
WWUS52 KMLB 201459
SVSMLB

Severe Weather Statement
National Weather Service Melbourne FL
959 AM EST THU DEC 20 2018

FLC095-201507-
/O.EXP.KMLB.TO.W.0012.000000T0000Z-181220T1500Z/
Orange FL-
959 AM EST THU DEC 20 2018

...THE TORNADO WARNING FOR SOUTHWESTERN ORANGE COUNTY WILL EXPIRE AT
1000 AM EST...
                
Rotation with the storm which prompted the warning has weakened, and 
no longer appears capable of producing a tornado. Therefore, the 
warning will be allowed to expire.  However gusty winds and heavy 
rain are still occurring with these thunderstorms, and additional
storms may rapidly spinup into a brief tornado through late morning.

A Tornado Watch remains in effect until 400 PM EST for east central
Florida.

LAT...LON 2860 8148 2859 8125 2835 8147 2835 8155
      2849 8156
TIME...MOT...LOC 1457Z 214DEG 35KT 2863 8136 

$$

Cristaldi

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 20, 3:46 AM EST	Gale Warning	MLB		48 hr
Dec 20, 4:12 AM EST	Beach Hazards Statement	MLB	Volusia	14 hr
Dec 20, 4:15 AM EST	Lake Wind Advisory	MLB	Okeechobee, Orange, Osceola, Seminole, Volusia	14 hr
Dec 20, 8:17 AM EST	Special Weather Statement	MLB	Lake	58 min
Dec 20, 8:23 AM EST	Tornado Warning	MLB	Lake, Orange	22 min
Dec 20, 9:14 AM EST	Special Weather Statement	MLB	Orange, Seminole, Volusia	61 min
Dec 20, 9:37 AM EST	Special Marine Warning	MLB		3 hr
Dec 20, 10:00 AM EST	Areal Flood Advisory	MLB	Lake, Orange, Osceola, Seminole, Volusia	2 hr
Dec 20, 10:18 AM EST	Special Weather Statement	MLB	Orange, Seminole, Volusia	57 min
Dec 20, 10:46 AM EST	Tornado Warning	MLB	Seminole, Volusia	29 min
Dec 20, 11:01 AM EST	Tornado Warning	MLB	Volusia	29 min
Dec 20, 11:24 AM EST	Tornado Warning	MLB	Volusia	19 min
Dec 20, 11:35 AM EST	Severe Thunderstorm Warning	MLB	Brevard, Orange, Osceola, Seminole, Volusia	55 min
Dec 20, 12:02 PM EST	Tornado Warning	MLB	Brevard, Seminole, Volusia	28 min
Dec 20, 12:21 PM EST	Areal Flood Advisory	MLB	Brevard, Lake, Orange, Osceola, Seminole, Volusia	3 hr
Dec 20, 12:25 PM EST	Special Marine Warning	MLB		110 min
Dec 20, 12:33 PM EST	Severe Thunderstorm Warning	MLB	Brevard, Seminole, Volusia	27 min
Dec 20, 12:57 PM EST	Severe Thunderstorm Warning	MLB	Brevard, Orange, Osceola	63 min
Dec 20, 1:42 PM EST	Special Weather Statement	MLB	Okeechobee	48 min
Dec 20, 2:02 PM EST	Special Marine Warning	MLB		3 hr
Dec 20, 2:05 PM EST	Special Weather Statement	MLB	Brevard	25 min
Dec 20, 2:19 PM EST	Special Marine Warning	MLB		3 hr
Dec 20, 2:25 PM EST	Severe Thunderstorm Warning	MLB	Brevard	27 min
Dec 20, 2:59 PM EST	Special Weather Statement	MLB	Indian River, Martin, Saint Lucie	61 min

Nearby

Tornado Warnings in Florida, 2018 Every tornado warning in 2018 Tornadoes in 2018

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.