Alert archive / Florida / Tornado Warnings in 2018

Tornado Warning 15, NWS Melbourne, FL

December 20, 2018Volusia County, Florida

NWS Melbourne, FL issued this tornado warning at Dec 20, 2018, 11:24 AM EST for Volusia County, Florida. It was in force for 19 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, 11:24 AM EST (16:24 UTC)
Expired: Dec 20, 2018, 11:43 AM EST
In force: 19 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

County Volusia County, FL

The radar

The Melbourne radar (KMLB), 89 km from the middle of the area, began a volume at 16:24 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, 4.4 hours before the alert went out and 60 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.

823 
WFUS52 KMLB 201624
TORMLB
FLC127-201700-
/O.NEW.KMLB.TO.W.0015.181220T1624Z-181220T1700Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Melbourne FL
1124 AM EST THU DEC 20 2018

The National Weather Service in Melbourne has issued a

* Tornado Warning for...
  Southeastern Volusia County in east central Florida...

* Until noon EST.

* At 1124 AM EST, severe thunderstorms capable of producing both 
  tornadoes and straight line wind damage were located over Maytown, 
  or near Scottsmoor, 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...
  Oak Hill, Bethune Beach and Apollo Beach around 1140 AM EST.

Other locations impacted by this tornadic thunderstorm include
Eldora.

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 2902 8086 2889 8076 2879 8089 2879 8097
      2880 8099
TIME...MOT...LOC 1624Z 212DEG 44KT 2880 8093 

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

$$

Rodriguez

3 follow-up statements

650 
WWUS52 KMLB 201631
SVSMLB

Severe Weather Statement
National Weather Service Melbourne FL
1131 AM EST THU DEC 20 2018

FLC127-201700-
/O.CON.KMLB.TO.W.0015.000000T0000Z-181220T1700Z/
Volusia FL-
1131 AM EST THU DEC 20 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL NOON EST FOR EAST
CENTRAL VOLUSIA COUNTY...

At 1130 AM EST, a severe squall line capable of producing both 
tornadoes and straight line wind damage was located over Oak Hill, 
moving northeast at 50 mph. This storm will move very rapidly 
towards Oak Hill and southern Edgewater areas, including Apollo 
Beach.

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.

This tornadic thunderstorm will remain over east central Volusia 
County, including the following locations...Oak Hill, Edgewater, 
Apollo Beach, and Turtle Mound.


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 2902 8086 2889 8076 2879 8089 2885 8096
TIME...MOT...LOC 1630Z 212DEG 44KT 2886 8088 

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

$$

Rodriguez

392 
WWUS52 KMLB 201637
SVSMLB

Severe Weather Statement
National Weather Service Melbourne FL
1137 AM EST THU DEC 20 2018

FLC127-201700-
/O.CON.KMLB.TO.W.0015.000000T0000Z-181220T1700Z/
Volusia FL-
1137 AM EST THU DEC 20 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL NOON EST FOR
SOUTHEASTERN VOLUSIA COUNTY...

At 1137 AM EST, a severe squall line capable of producing both 
tornadoes and straight line wind damage was located over Bethune 
Beach, or near Edgewater, moving northeast at 50 mph. This storm is 
moving over the intracoastal waterway east of Edgewater, and will 
then cross over the barrier island.

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.

Locations impacted include...
Oak Hill, Apollo Beach, Bethune Beach, Turtle Mound and Eldora. 

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 2902 8086 2892 8079 2887 8085 2894 8091
TIME...MOT...LOC 1637Z 205DEG 41KT 2892 8086 

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

$$

Rodriguez

794 
WWUS52 KMLB 201643
SVSMLB

Severe Weather Statement
National Weather Service Melbourne FL
1143 AM EST THU DEC 20 2018

FLC127-201652-
/O.CAN.KMLB.TO.W.0015.000000T0000Z-181220T1700Z/
Volusia FL-
1143 AM EST THU DEC 20 2018

...THE TORNADO WARNING FOR SOUTHEASTERN VOLUSIA COUNTY IS
CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the tornado warning has been cancelled.

A Tornado Watch remains in effect until 400 PM EST 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.

Remember, a Severe Thunderstorm Warning still remains in effect for
southeastern portions of Volusia County until 12:30 pm EST.

LAT...LON 2902 8086 2892 8079 2887 8085 2894 8091
TIME...MOT...LOC 1642Z 212DEG 44KT 2895 8084 

$$

Rodriguez

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, 9:25 AM EST	Tornado Warning	MLB	Orange	35 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, 11:35 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.