Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 50, NWS Melbourne, FL

June 10, 2012Lake County, Seminole County, Volusia County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Jun 10, 2012, 7:29 PM EDT for Lake County, Seminole County, Volusia County, Florida. It was in force for 61 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: Jun 10, 2012, 7:29 PM EDT (23:29 UTC)
Expired: Jun 10, 2012, 8:30 PM EDT
In force: 61 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon

Counties Lake County, FL, Seminole County, FL, Volusia County, FL

The radar

The Melbourne radar (KMLB), 110 km from the middle of the area, began a volume at 23:30 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
Jun 10, 8:05 PM EDT	TSTM WND DMG	5 N Lake Mary, FL	TWO TREES DOWN. TIME ESTIMATED BY RADAR.

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 12:00Z, 11.5 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: 741 J/kg
Mixed-layer CIN: -41 J/kg
Mixed-layer LCL: 953 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 89 m²/s²
0-3 km storm-relative helicity: 115 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.9

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

469 
WUUS52 KMLB 102329
SVRMLB
FLC069-117-127-110030-
/O.NEW.KMLB.SV.W.0050.120610T2329Z-120611T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
729 PM EDT SUN JUN 10 2012

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL LAKE COUNTY IN FLORIDA
  NORTHERN SEMINOLE COUNTY IN FLORIDA
  SOUTHERN VOLUSIA COUNTY IN FLORIDA

* UNTIL 830 PM EDT.

* AT 725 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  CASSIA...AND MOVING SOUTHEAST AT 15 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...
  ORANGE CITY...DE BARY...DEBARY...LAKE MONROE...LAKE MARY...        
  DELTONA...SANFORD AND LAKE JESSUP.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS IN EXCESS OF 58 MILES AN
HOUR AND OR LARGE DESTRUCTIVE HAIL. FREQUENT TO EXCESSIVE LIGHTNING
AND VERY HEAVY RAIN WILL ALSO BE POSSIBLE. IF THE STORM APPROACHES
YOU...SEEK SHELTER IN AN ENCLOSED BUILDING ON THE LOWEST FLOOR. KEEP
AWAY FROM WINDOWS.

NATIONAL WEATHER SERVICE METEOROLOGISTS ALSO DETECTED SOME WEAK
ROTATION WITHIN THIS STORM. WHILE NOT IMMEDIATELY LIKELY...A TORNADO
MAY STILL DEVELOP. IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO
A PLACE OF SAFETY IN A STURDY STRUCTURE...SUCH AS A SMALL INTERIOR
ROOM.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

&&

LAT...LON 2907 8145 2890 8108 2868 8124 2877 8141
      2878 8142 2879 8145 2886 8158
TIME...MOT...LOC 2328Z 301DEG 14KT 2891 8142

$$


KELLY

2 follow-up statements

217 
WWUS52 KMLB 102345
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
745 PM EDT SUN JUN 10 2012

FLC069-117-127-110030-
/O.CON.KMLB.SV.W.0050.000000T0000Z-120611T0030Z/
SEMINOLE-LAKE-VOLUSIA-
745 PM EDT SUN JUN 10 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM EDT
FOR SOUTHWEST VOLUSIA...EAST CENTRAL LAKE AND NORTHWESTERN
SEMINOLE COUNTIES...

AT 739 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
DETECT A SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL...
AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR 
HIGH BANKS...MOVING SOUTHEAST AT 20 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
VALDEZ...CENTRAL FLORIDA ZOO...ENTERPRISE...DELTONA...LAKE 
MONROE...LAKE MARY...SANFORD...SANFORD AIRPORT AND LAKE JESSUP.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

&&

LAT...LON 2896 8136 2890 8108 2868 8124 2877 8141
      2878 8142 2879 8146 2881 8148
TIME...MOT...LOC 2345Z 315DEG 16KT 2884 8136

$$


KELLY

125 
WWUS52 KMLB 110029
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
829 PM EDT SUN JUN 10 2012

FLC069-117-127-110037-
/O.EXP.KMLB.SV.W.0050.000000T0000Z-120611T0030Z/
SEMINOLE-LAKE-VOLUSIA-
829 PM EDT SUN JUN 10 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL VOLUSIA...EAST
CENTRAL LAKE AND NORTHWESTERN SEMINOLE COUNTIES WILL EXPIRE AT 830 PM
EDT...

THE SEVERE STORM THAT PROMPTED THE WARNING HAD WEAKENED AND EXITED 
THE WARNING AREA...THUS THE WARNING WILL BE ALLOWED TO EXPIRE. 
HOWEVER...GUSTY WINDS...DANGEROUS LIGHTNING AND VERY HEAVY RAIN WILL 
AFFECT SOUTHWEST VOLUSIA COUNTY THROUGH 9 PM.

LAT...LON 2896 8136 2890 8108 2868 8124 2877 8141
      2878 8142 2879 8146 2881 8148
TIME...MOT...LOC 0027Z 315DEG 16KT 2871 8121

$$


KELLY

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 9, 8:11 PM EDT	Special Weather Statement	MLB	Osceola	49 min
Jun 10, 3:39 PM EDT	Areal Flood Advisory	MLB	Volusia	51 min
Jun 10, 4:39 PM EDT	Severe Thunderstorm Warning	MLB	Volusia	66 min
Jun 10, 5:55 PM EDT	Special Weather Statement	MLB	Volusia	65 min
Jun 10, 6:26 PM EDT	Severe Thunderstorm Warning	MLB	Lake, Volusia	64 min
Jun 10, 7:23 PM EDT	Special Weather Statement	MLB	Seminole	37 min
Jun 10, 7:48 PM EDT	Special Weather Statement	MLB	Lake	42 min
Jun 10, 7:52 PM EDT	Special Weather Statement	MLB	Volusia	38 min

Nearby

Severe Thunderstorm Warnings in Florida, 2012 Every severe thunderstorm warning in 2012

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.