Alert archive / Florida / Tornado Warnings in 2018

Tornado Warning 7, NWS Melbourne, FL

April 24, 2018Martin County, Florida

NWS Melbourne, FL issued this tornado warning at Apr 24, 2018, 2:16 PM EDT for Martin County, Florida. It was in force for 29 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 24, 2018, 2:16 PM EDT (18:16 UTC)
Expired: Apr 24, 2018, 2:45 PM EDT
In force: 29 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

County Martin County, FL

The radar

The Melbourne radar (KMLB), 118 km from the middle of the area, began a volume at 18:17 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

Miami, FL (KMFL), launched 12:00Z, 6.3 hours before the alert went out and 140 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: 694 J/kg
Mixed-layer CIN: -35 J/kg
Mixed-layer LCL: 910 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 48 m²/s²
0-3 km storm-relative helicity: 115 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.0

Open this sounding in Storm Lab

The text

As transmitted.

218 
WFUS52 KMLB 241816
TORMLB
FLC085-241845-
/O.NEW.KMLB.TO.W.0007.180424T1816Z-180424T1845Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Melbourne FL
216 PM EDT TUE APR 24 2018

The National Weather Service in Melbourne has issued a

* Tornado Warning for...
  Western Martin County in east central Florida...

* Until 245 PM EDT
    
* At 216 PM EDT, a severe thunderstorm capable of producing a tornado
  was located over Indiantown, 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 dangerous storm will be near...
  Indiantown around 230 PM EDT. 

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.

&&

LAT...LON 2698 8054 2708 8058 2721 8031 2721 8030
      2697 8027
TIME...MOT...LOC 1816Z 251DEG 16KT 2702 8051 

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

$$

DWS

1 follow-up statement

601 
WWUS52 KMLB 241840
SVSMLB

Severe Weather Statement
National Weather Service Melbourne FL
240 PM EDT TUE APR 24 2018

FLC085-241849-
/O.EXP.KMLB.TO.W.0007.000000T0000Z-180424T1845Z/
Martin FL-
240 PM EDT TUE APR 24 2018

...THE TORNADO WARNING FOR WESTERN MARTIN COUNTY WILL EXPIRE AT 245
PM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore the warning will be allowed to expire.  However gusty winds
and small hail are possible with the thunderstorms.

LAT...LON 2698 8054 2708 8058 2721 8031 2721 8030
      2697 8027
TIME...MOT...LOC 1839Z 251DEG 16KT 2705 8043 

$$

Pendergrast

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 24, 12:01 PM EDT	Special Weather Statement	MLB	Martin, Saint Lucie	59 min
Apr 24, 12:26 PM EDT	Special Marine Warning	MLB		64 min
Apr 24, 12:36 PM EDT	Severe Thunderstorm Warning	MLB	Saint Lucie	27 min
Apr 24, 12:47 PM EDT	Special Marine Warning	MLB		43 min
Apr 24, 1:00 PM EDT	Special Weather Statement	MLB	Martin, Saint Lucie	45 min
Apr 24, 1:31 PM EDT	Severe Thunderstorm Warning	MLB	Martin, Saint Lucie	59 min
Apr 24, 1:34 PM EDT	Special Marine Warning	MLB		56 min
Apr 24, 1:49 PM EDT	Special Weather Statement	MLB	Martin	41 min
Apr 24, 1:55 PM EDT	Severe Thunderstorm Warning	MLB	Martin	50 min
Apr 24, 1:57 PM EDT	Special Marine Warning	MLB		63 min
Apr 24, 2:08 PM EDT	Severe Thunderstorm Warning	MLB	Saint Lucie	52 min
Apr 24, 2:12 PM EDT	Severe Thunderstorm Warning	MLB	Martin, Saint Lucie	34 min
Apr 24, 2:25 PM EDT	Special Marine Warning	MLB		2 hr
Apr 24, 2:40 PM EDT	Severe Thunderstorm Warning	MLB	Martin	50 min
Apr 24, 5:49 PM EDT	Special Weather Statement	MLB	Martin	41 min

Nearby

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