Alert archive / Florida / Tornado Warnings in 2017

Tornado Warning 65, NWS Melbourne, FL

September 10, 2017Lake County, Volusia County, Florida

NWS Melbourne, FL issued this tornado warning at Sep 10, 2017, 9:34 PM EDT for Lake County, Volusia 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
Sep 10, 2017, 9:34 PM EDT (01:34 UTC)
Expired
Sep 10, 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 Lake County, FL, Volusia County, FL

The radar

The Melbourne radar (KMLB), 131 km from the middle of the area, began a volume at 01:37 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Sep 10, 12:02 PM EDTTornado WatchSPC13 hr

The nearest sounding before it

Jacksonville, FL (KJAX), launched 00:00Z, 1.6 hours before the alert went out and 160 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-pSkew-T log-p diagram, Jacksonville, FL at 00:00Z on 2017-09-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 270 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Jacksonville, FL at 00:00Z on 2017-09-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 282 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
270 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
514 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
282 m²/s²
0-3 km storm-relative helicity
319 m²/s²
Significant tornado parameter
0.4
Supercell composite
2.9

Open this sounding in Storm Lab

The text

As transmitted.

385 
WFUS52 KMLB 110134
TORMLB
FLC069-127-110200-
/O.NEW.KMLB.TO.W.0065.170911T0134Z-170911T0200Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Melbourne FL
934 PM EDT SUN SEP 10 2017

The National Weather Service in Melbourne has issued a

* Tornado Warning for...
  Northeastern Lake County in east central Florida...
  Central Volusia 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 southwest of Daytona International Speedway, or
  9 miles northeast of Lake Helen, moving west at 60 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. 

* Locations impacted include...
  DeLand, DeLeon Springs, Pittman, DeLand Airport and West DeLand. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2912 8109 2903 8110 2899 8166 2905 8166
      2905 8164 2922 8164
TIME...MOT...LOC 0133Z 093DEG 51KT 2909 8115 

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

$$

JCG

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 10, 8:09 PM EDTSpecial Weather StatementMLBBrevard, Indian River, Orange, Osceola51 min
Sep 10, 8:40 PM EDTTornado WarningMLBBrevard35 min
Sep 10, 8:51 PM EDTTornado WarningMLBLake, Seminole, Volusia24 min
Sep 10, 9:01 PM EDTTornado WarningMLBBrevard14 min
Sep 10, 9:06 PM EDTSpecial Weather StatementMLBBrevard, Lake, Orange, Seminole, Volusia54 min
Sep 10, 9:19 PM EDTTornado WarningMLBVolusia26 min
Sep 10, 9:45 PM EDTTornado WarningMLBBrevard15 min
Sep 10, 9:58 PM EDTFlash Flood WarningMLBBrevard, Orange, Seminole, Volusia107 min
Sep 10, 10:10 PM EDTRiver Flood WarningMLBBrevard53 days
Sep 10, 10:10 PM EDTRiver Flood WarningMLBLake, Volusia60 days
Sep 10, 10:21 PM EDTTornado WarningMLBBrevard, Orange24 min
Sep 10, 10:35 PM EDTTornado WarningMLBVolusia25 min
Sep 10, 10:51 PM EDTTornado WarningMLBBrevard, Volusia9 min
Sep 10, 11:27 PM EDTSpecial Weather StatementMLBLake33 min
Sep 11, 12:01 AM EDTSpecial Weather StatementMLBLake, Orange, Osceola89 min
Sep 11, 1:33 AM EDTSpecial Weather StatementMLBLake, Orange87 min
Sep 11, 3:00 AM EDTSpecial Weather StatementMLBLake90 min
Sep 11, 5:34 AM EDTTropical Storm WarningMLBLake, Okeechobee, Orange, Osceola, Seminole, Volusia10 hr
Sep 11, 11:21 AM EDTWind AdvisoryMLBLake, Okeechobee, Orange, Osceola, Seminole, Volusia7 hr
Sep 11, 11:29 AM EDTCoastal Flood StatementMLBVolusia17 hr
Sep 11, 3:59 PM EDTSmall Craft AdvisoryMLB18 hr

Nearby

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