Alert archive / Florida / Tornado Warnings in 2017

Tornado Warning 17, NWS Melbourne, FL

July 31, 2017Martin County, Saint Lucie County, Florida

NWS Melbourne, FL issued this tornado warning at Jul 31, 2017, 9:34 PM EDT for Martin County, Saint Lucie County, Florida. It was in force for 26 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: Jul 31, 2017, 9:34 PM EDT (01:34 UTC)
Expired: Jul 31, 2017, 10:00 PM EDT
In force: 26 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

Counties Martin County, FL, Saint Lucie County, FL

The radar

The Melbourne radar (KMLB), 102 km from the middle of the area, began a volume at 01:35 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, 1.6 hours before the alert went out and 142 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: 441 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 727 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: -17 m²/s²
0-3 km storm-relative helicity: -19 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.5

Open this sounding in Storm Lab

The text

As transmitted.

042 
WFUS52 KMLB 010134
TORMLB
FLC085-111-010200-
/O.NEW.KMLB.TO.W.0017.170801T0134Z-170801T0200Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Melbourne FL
934 PM EDT MON JUL 31 2017

The National Weather Service in Melbourne has issued a

* Tornado Warning for...
  South central St. Lucie County in east central Florida...
  Northwestern Martin County in east central Florida...

* Until 1000 PM EDT
    
* At 933 PM EDT, a severe thunderstorm capable of producing a tornado
  was located 8 miles northeast of J And S Fish Camp, moving 
  northeast at 20 mph. Persistant rotation has been observed on 
  radar.

  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
  south central St. Lucie and northwestern Martin Counties.

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.

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

&&

LAT...LON 2718 8068 2720 8068 2729 8052 2721 8041
      2710 8054
TIME...MOT...LOC 0133Z 227DEG 19KT 2718 8057 

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

$$

Pendergrast

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 8:57 PM EDT	Tornado Warning	MLB	Martin	33 min
Aug 1, 4:26 AM EDT	Rip Current Statement	MLB	Volusia	15 hr
Aug 1, 6:42 PM EDT	Special Weather Statement	MLB	Volusia	48 min
Aug 1, 7:26 PM EDT	Special Weather Statement	MLB	Volusia	64 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.