Alert archive / Florida / Tornado Warnings in 2015

Tornado Warning 1, NWS Melbourne, FL

April 11, 2015Osceola County, Florida

NWS Melbourne, FL issued this tornado warning at Apr 11, 2015, 8:22 PM EDT for Osceola County, Florida. It was in force for 23 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 11, 2015, 8:22 PM EDT (00:22 UTC)
Expired: Apr 11, 2015, 8:45 PM EDT
In force: 23 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon

County Osceola County, FL

The radar

The Melbourne radar (KMLB), 65 km from the middle of the area, began a volume at 00:21 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 00:00Z, 0.4 hours before the alert went out and 89 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: 601 J/kg
Mixed-layer CIN: -64 J/kg
Mixed-layer LCL: 1045 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: -28 m²/s²
0-3 km storm-relative helicity: 56 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

366 
WFUS52 KMLB 120022
TORMLB
FLC097-120045-
/O.NEW.KMLB.TO.W.0001.150412T0022Z-150412T0045Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
822 PM EDT SAT APR 11 2015

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* TORNADO WARNING FOR...
  NORTH CENTRAL OSCEOLA COUNTY IN EAST CENTRAL FLORIDA...

* UNTIL 845 PM EDT
    
* AT 822 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED 7
  MILES SOUTHEAST OF WEST LAKE TOHO...AND MOVING EAST AT 5 TO 10 MPH.

* LOCATIONS IMPACTED INCLUDE...
  ALLIGATOR LAKE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO A BASEMENT OR AN INTERIOR ROOM ON THE LOWEST
FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF YOU ARE IN A MOBILE
HOME OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND
PROTECT YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 2823 8121 2811 8114 2805 8136 2807 8137
      2807 8135 2808 8135 2808 8137 2809 8138
      2812 8139
TIME...MOT...LOC 0022Z 247DEG 6KT 2812 8134 

$$

15

2 follow-up statements

760 
WWUS52 KMLB 120032
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
832 PM EDT SAT APR 11 2015

FLC097-120045-
/O.CON.KMLB.TO.W.0001.000000T0000Z-150412T0045Z/
OSCEOLA FL-
832 PM EDT SAT APR 11 2015

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 845 PM EDT FOR NORTH
CENTRAL OSCEOLA COUNTY...
    
AT 831 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 
CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED 8 
MILES SOUTHEAST OF SAINT CLOUD...MOVING EAST AT 5 TO 10 MPH. 

LOCATIONS IMPACTED INCLUDE... 
LAKE GENTRY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO A BASEMENT OR AN INTERIOR ROOM ON THE LOWEST
FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF YOU ARE IN A MOBILE
HOME OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND
PROTECT YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 2823 8121 2811 8114 2805 8136 2807 8137
      2807 8135 2808 8135 2808 8137 2809 8138
      2812 8139
TIME...MOT...LOC 0031Z 248DEG 5KT 2813 8124 

$$

15

771 
WWUS52 KMLB 120045
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
845 PM EDT SAT APR 11 2015

FLC097-120053-
/O.EXP.KMLB.TO.W.0001.000000T0000Z-150412T0045Z/
OSCEOLA FL-
845 PM EDT SAT APR 11 2015

...THE TORNADO WARNING FOR OSCEOLA COUNTY WILL EXPIRE
AT 845 PM EDT...
    
THE TORNADO THREAT HAS DIMINISHED...THEREFORE THE TORNADO WARNING 
HAS BEEN CANCELLED. HOWEVER...DAMAGING WINDS REMAIN LIKELY AND A 
SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR THE AREA. 

REMEMBER...A SEVERE THUNDERSTORM WARNING STILL REMAINS IN EFFECT FOR
PORTIONS OF OSCEOLA COUNTY UNTIL 930 PM.

LAT...LON 2823 8121 2811 8114 2805 8136 2807 8137
      2807 8135 2808 8135 2808 8137 2809 8138
      2812 8139
TIME...MOT...LOC 0042Z 247DEG 6KT 2813 8124 

$$

15

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 11, 8:35 PM EDT	Severe Thunderstorm Warning	MLB	Osceola	40 min
Apr 11, 9:13 PM EDT	Areal Flood Advisory	MLB	Osceola	2 hr
Apr 12, 3:54 PM EDT	Special Weather Statement	MLB	Indian River	51 min
Apr 12, 4:22 PM EDT	Special Weather Statement	MLB	Brevard	38 min
Apr 12, 4:57 PM EDT	Areal Flood Advisory	MLB	Brevard, Volusia	2 hr
Apr 12, 6:43 PM EDT	Areal Flood Advisory	MLB	Volusia	2 hr

Nearby

Tornado Warnings in Florida, 2015 Every tornado warning in 2015 Tornadoes in 2015

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.