Alert archive / Florida / Tornado Warnings in 2018

Tornado Warning 11, NWS Melbourne, FL

December 20, 2018Lake County, Orange County, Florida

NWS Melbourne, FL issued this tornado warning at Dec 20, 2018, 8:23 AM EST for Lake County, Orange County, Florida. It was in force for 22 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, 8:23 AM EST (13:23 UTC)
Expired
Dec 20, 2018, 8:45 AM EST
In force
22 min
Issued by
NWS Melbourne, FL
Area
Storm-based polygon
Tornado
Radar indicated
Hail
0.0 in

Counties Lake County, FL, Orange County, FL

The radar

The Melbourne radar (KMLB), 111 km from the middle of the area, began a volume at 13:23 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.

IssuedProductOfficeLasted
Dec 20, 7:55 AM ESTTornado WatchSPC7 hr

The nearest sounding before it

Cape Canaveral, FL (KXMR), launched 12:00Z, 1.4 hours before the alert went out and 107 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-pSkew-T log-p diagram, Cape Canaveral, FL at 12:00Z on 2018-12-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 326 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Cape Canaveral, FL at 12:00Z on 2018-12-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 174 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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.

506 
WFUS52 KMLB 201323
TORMLB
FLC069-095-201345-
/O.NEW.KMLB.TO.W.0011.181220T1323Z-181220T1345Z/

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

The National Weather Service in Melbourne has issued a

* Tornado Warning for...
  Southern Lake County in east central Florida...
  Northwestern Orange County in east central Florida...

* Until 845 AM EST.

* At 822 AM EST, severe thunderstorms capable of producing both 
  tornadoes and straight line wind damage were located over 
  Groveland, moving northeast at 45 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...
  Ferndale around 830 AM EST.
  Lake Apopka around 840 AM EST.

Other locations impacted by this tornadic thunderstorm include
Minneola.

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 2892 8155 2876 8141 2872 8143 2871 8144
      2871 8146 2866 8146 2845 8183 2859 8195
TIME...MOT...LOC 1322Z 232DEG 37KT 2857 8183 

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

$$

Cristaldi
2 follow-up statements
102 
WWUS52 KMLB 201335
SVSMLB

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

FLC069-095-201345-
/O.CON.KMLB.TO.W.0011.000000T0000Z-181220T1345Z/
Lake FL-Orange FL-
835 AM EST THU DEC 20 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 845 AM EST FOR SOUTHERN
LAKE AND NORTHWESTERN ORANGE COUNTIES...

At 833 AM EST, a squall line capable of producing brief tornadoes 
and straight line wind damage was located over Ferndale, moving 
northeast at 45 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.

This tornadic thunderstorm will remain over mainly rural areas of
southern Lake and northwestern Orange Counties, including the
following locations... Minneola and Lake Apopka.

Other storms slightly farther south are showing signs of rotation.
Additional warnings are likely.

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.

If a tornado or other severe weather is spotted, report it to the
National Weather Service or your local nearest law enforcement agency
who will send your report. This act may save lives of others in the
path of dangerous weather.

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 2892 8155 2876 8141 2872 8143 2871 8144
      2871 8146 2866 8146 2845 8183 2867 8184
TIME...MOT...LOC 1333Z 232DEG 37KT 2865 8172 

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

$$

Cristaldi
387 
WWUS52 KMLB 201344
SVSMLB

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

FLC069-095-201352-
/O.EXP.KMLB.TO.W.0011.000000T0000Z-181220T1345Z/
Lake FL-Orange FL-
844 AM EST THU DEC 20 2018

...THE TORNADO WARNING FOR SOUTHERN LAKE AND NORTHWESTERN ORANGE
COUNTIES WILL EXPIRE AT 845 AM EST...
    
The tornadic thunderstorm which prompted the warning has weakened 
for now, therefore, the warning will be allowed to expire. However 
gusty winds are still possible with the squall line that is moving 
through the area, and embedded storms could rapidly acquire 
rotation. Don't let your guard down today!

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

LAT...LON 2892 8155 2876 8141 2872 8143 2871 8144
      2871 8146 2866 8146 2845 8183 2867 8184
TIME...MOT...LOC 1342Z 232DEG 37KT 2871 8164 

$$

Cristaldi

The office that day

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

IssuedProductOfficeCountiesLasted
Dec 20, 3:46 AM ESTGale WarningMLB48 hr
Dec 20, 4:12 AM ESTBeach Hazards StatementMLBVolusia14 hr
Dec 20, 4:15 AM ESTLake Wind AdvisoryMLBOkeechobee, Orange, Osceola, Seminole, Volusia14 hr
Dec 20, 8:17 AM ESTSpecial Weather StatementMLBLake58 min
Dec 20, 9:14 AM ESTSpecial Weather StatementMLBOrange, Seminole, Volusia61 min
Dec 20, 9:25 AM ESTTornado WarningMLBOrange35 min
Dec 20, 9:37 AM ESTSpecial Marine WarningMLB3 hr
Dec 20, 10:00 AM ESTAreal Flood AdvisoryMLBLake, Orange, Osceola, Seminole, Volusia2 hr
Dec 20, 10:18 AM ESTSpecial Weather StatementMLBOrange, Seminole, Volusia57 min
Dec 20, 10:46 AM ESTTornado WarningMLBSeminole, Volusia29 min
Dec 20, 11:01 AM ESTTornado WarningMLBVolusia29 min
Dec 20, 11:24 AM ESTTornado WarningMLBVolusia19 min
Dec 20, 11:35 AM ESTSevere Thunderstorm WarningMLBBrevard, Orange, Osceola, Seminole, Volusia55 min
Dec 20, 12:02 PM ESTTornado WarningMLBBrevard, Seminole, Volusia28 min
Dec 20, 12:21 PM ESTAreal Flood AdvisoryMLBBrevard, Lake, Orange, Osceola, Seminole, Volusia3 hr
Dec 20, 12:25 PM ESTSpecial Marine WarningMLB110 min
Dec 20, 12:33 PM ESTSevere Thunderstorm WarningMLBBrevard, Seminole, Volusia27 min
Dec 20, 12:57 PM ESTSevere Thunderstorm WarningMLBBrevard, Orange, Osceola63 min
Dec 20, 1:42 PM ESTSpecial Weather StatementMLBOkeechobee48 min
Dec 20, 2:02 PM ESTSpecial Marine WarningMLB3 hr
Dec 20, 2:05 PM ESTSpecial Weather StatementMLBBrevard25 min
Dec 20, 2:19 PM ESTSpecial Marine WarningMLB3 hr
Dec 20, 2:25 PM ESTSevere Thunderstorm WarningMLBBrevard27 min
Dec 20, 2:59 PM ESTSpecial Weather StatementMLBIndian River, Martin, Saint Lucie61 min

Nearby

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