Alert archive / Florida / Tornado Warnings in 2017

Tornado Warning 15, NWS Melbourne, FL

July 7, 2017Osceola County, Florida

NWS Melbourne, FL issued this tornado warning at Jul 7, 2017, 8:27 PM EDT for Osceola County, Florida. It was in force for 18 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 7, 2017, 8:27 PM EDT (00:27 UTC)
Expired: Jul 7, 2017, 8:45 PM EDT
In force: 18 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Osceola County, FL

The radar

The Melbourne radar (KMLB), 83 km from the middle of the area, began a volume at 00:30 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.

What was reported inside it

Time	Report	Where	Remark
Jul 7, 8:30 PM EDT	TORNADO	Buena Ventura Lakes, FL	EMERGENCY MANAGER REPORTS A BRIEF TOUCHDOWN OF A TORNADO

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Cape Canaveral, FL (KXMR), launched 00:00Z, 0.5 hours before the alert went out and 97 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: 735 J/kg
Mixed-layer CIN: -89 J/kg
Mixed-layer LCL: 1381 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 42 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

066 
WFUS52 KMLB 080027
TORMLB
FLC097-080045-
/O.NEW.KMLB.TO.W.0015.170708T0027Z-170708T0045Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Melbourne FL
827 PM EDT FRI JUL 7 2017

The National Weather Service in Melbourne has issued a

* Tornado Warning for...
  Northwestern Osceola County in east central Florida...

* Until 845 PM EDT
    
* At 827 PM EDT, a severe thunderstorm capable of producing a tornado
  was located over Hunters Creek, or over Kissimmee, moving north at
  70 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
  northwestern Osceola County, including the following locations:
  Kissimmee 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.

&&

LAT...LON 2835 8153 2835 8132 2822 8135 2825 8155
      2826 8156
TIME...MOT...LOC 0027Z 176DEG 61KT 2834 8141 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

Johnson

1 follow-up statement

621 
WWUS52 KMLB 080037
SVSMLB

Severe Weather Statement
National Weather Service Melbourne FL
837 PM EDT FRI JUL 7 2017

FLC097-080045-
/O.EXP.KMLB.TO.W.0015.000000T0000Z-170708T0045Z/
Osceola FL-
837 PM EDT FRI JUL 7 2017

...THE TORNADO WARNING FOR NORTHWESTERN OSCEOLA COUNTY WILL EXPIRE AT
845 PM EDT...

...The tornadic thunderstorm which prompted continues. Moving was 
northeast at 10 mph.

LAT...LON 2835 8153 2835 8132 2822 8135 2825 8155
      2826 8156
TIME...MOT...LOC 0035Z 176DEG 61KT 2847 8142 

$$

Johnson

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 7, 8:10 PM EDT	Special Weather Statement	MLB	Orange	65 min
Jul 7, 8:24 PM EDT	Tornado Warning	MLB	Orange	38 min
Jul 7, 9:14 PM EDT	Special Weather Statement	MLB	Seminole	61 min
Jul 8, 12:48 PM EDT	Special Weather Statement	MLB	Lake	27 min
Jul 8, 1:21 PM EDT	Special Weather Statement	MLB	Orange	24 min
Jul 8, 1:56 PM EDT	Special Weather Statement	MLB	Seminole, Volusia	49 min
Jul 8, 3:07 PM EDT	Areal Flood Advisory	MLB	Brevard, Orange, Volusia	83 min
Jul 8, 3:12 PM EDT	Special Weather Statement	MLB	Seminole	33 min
Jul 8, 3:18 PM EDT	Special Marine Warning	MLB		42 min
Jul 8, 3:23 PM EDT	Special Weather Statement	MLB	Seminole	22 min
Jul 8, 3:34 PM EDT	Severe Thunderstorm Warning	MLB	Brevard, Orange, Osceola	56 min
Jul 8, 3:46 PM EDT	Special Weather Statement	MLB	Osceola	59 min
Jul 8, 4:16 PM EDT	Special Marine Warning	MLB		44 min
Jul 8, 4:18 PM EDT	Special Weather Statement	MLB	Brevard	42 min
Jul 8, 4:46 PM EDT	Special Weather Statement	MLB	Osceola	44 min

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.