Alert archive / Florida / Tornado Warnings in 2017

Tornado Warning 12, NWS Melbourne, FL

April 6, 2017Indian River County, Florida

NWS Melbourne, FL issued this tornado warning at Apr 6, 2017, 9:52 AM EDT for Indian River 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 6, 2017, 9:52 AM EDT (13:52 UTC)
Expired: Apr 6, 2017, 10:15 AM EDT
In force: 23 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

County Indian River County, FL

The radar

The Melbourne radar (KMLB), 55 km from the middle of the area, began a volume at 13:51 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 12:00Z, 1.9 hours before the alert went out and 95 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: 1944 J/kg
Mixed-layer CIN: -25 J/kg
Mixed-layer LCL: 765 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 269 m²/s²
0-3 km storm-relative helicity: 267 m²/s²
Significant tornado parameter: 3.1
Supercell composite: 14.3

Open this sounding in Storm Lab

The text

As transmitted.

081 
WFUS52 KMLB 061352
TORMLB
FLC061-061415-
/O.NEW.KMLB.TO.W.0012.170406T1352Z-170406T1415Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Melbourne FL
952 AM EDT THU APR 6 2017

The National Weather Service in Melbourne has issued a

* Tornado Warning for...
  Southern Indian River County in east central Florida...

* Until 1015 AM EDT
    
* At 952 AM EDT, a severe thunderstorm capable of producing a tornado
  was located near Fort Drum, moving east at 20 mph.

  HAZARD...Tornado and quarter size hail. 

  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 Indian River County, including the following locations:
  Vero Beach Airport.

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 outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

Motorists should not take shelter under highway overpasses. If you
cannot safely drive away from the tornado, as a last resort, either
park your vehicle and stay put, or abandon your vehicle and lie down
in a low lying area and protect yourself from flying debris.

&&

LAT...LON 2756 8036 2756 8078 2764 8078 2764 8085
      2770 8087 2774 8041 2754 8035
TIME...MOT...LOC 1352Z 265DEG 8KT 2761 8085 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

Johnson

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 6, 3:55 AM EDT	Fire Weather Watch	MLB	Lake, Okeechobee, Orange, Osceola, Seminole, Volusia	14 hr
Apr 6, 3:55 AM EDT	Red Flag Warning	MLB	Lake, Orange, Osceola, Seminole, Volusia	14 hr
Apr 6, 4:31 AM EDT	Special Weather Statement	MLB	Lake	59 min
Apr 6, 5:48 AM EDT	Special Weather Statement	MLB	Volusia	42 min
Apr 6, 6:00 AM EDT	Special Marine Warning	MLB		90 min
Apr 6, 7:54 AM EDT	Special Weather Statement	MLB	Osceola	51 min
Apr 6, 8:36 AM EDT	Special Weather Statement	MLB	Okeechobee	54 min
Apr 6, 9:09 AM EDT	Severe Thunderstorm Warning	MLB	Osceola	66 min
Apr 6, 9:22 AM EDT	Severe Thunderstorm Warning	MLB	Okeechobee	53 min
Apr 6, 9:31 AM EDT	Tornado Warning	MLB	Okeechobee	44 min
Apr 6, 10:13 AM EDT	Tornado Warning	MLB	Indian River	32 min
Apr 6, 10:21 AM EDT	Special Marine Warning	MLB		84 min
Apr 6, 10:50 AM EDT	Special Weather Statement	MLB	Indian River	40 min
Apr 6, 11:44 AM EDT	Special Marine Warning	MLB		91 min
Apr 6, 6:11 PM EDT	Red Flag Warning	MLB	Lake, Okeechobee, Orange, Osceola, Seminole, Volusia	26 hr

Nearby

Tornado Warnings in Florida, 2017 Every tornado warning in 2017 Tornadoes in 2017

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.