Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 6, NWS Melbourne, FL

April 4, 2012Osceola County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Apr 4, 2012, 7:05 PM EDT for Osceola 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 4, 2012, 7:05 PM EDT (23:05 UTC)
Expired: Apr 4, 2012, 7:34 PM EDT
In force: 29 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon

County Osceola County, FL

The radar

The Melbourne radar (KMLB), 59 km from the middle of the area, began a volume at 23:07 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 12:00Z, 11.1 hours before the alert went out and 90 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1678 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 48 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

095 
WUUS52 KMLB 042305
SVRMLB
FLC097-050000-
/O.NEW.KMLB.SV.W.0006.120404T2305Z-120405T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
705 PM EDT WED APR 4 2012

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  OSCEOLA COUNTY IN FLORIDA

* UNTIL 800 PM EDT.

* AT 702 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 6 MILES
  NORTH OF LAKE KISSIMMEE...AND MOVING NORTHEAST AT 15 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO... 
  HOLOPAW.

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 LIKELY. IF THE STORM APPROACHES
YOU...SEEK SHELTER IN AN ENCLOSED BUILDING ON THE LOWEST FLOOR. KEEP
AWAY FROM WINDOWS.

&&

LAT...LON 2830 8098 2794 8088 2784 8127 2785 8128
      2787 8131 2790 8132 2792 8132 2794 8135
      2795 8135 2798 8138 2801 8140
TIME...MOT...LOC 2304Z 245DEG 14KT 2801 8128

$$


KELLY

1 follow-up statement

461 
WWUS52 KMLB 042334
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
734 PM EDT WED APR 4 2012

FLC097-042343-
/O.CAN.KMLB.SV.W.0006.000000T0000Z-120405T0000Z/
OSCEOLA-
734 PM EDT WED APR 4 2012

...THE SEVERE THUNDERSTORM WARNING FOR OSCEOLA COUNTY IS CANCELLED...

THE SEVERE STORM THAT PROMPTED THE WARNING HAD WEAKENED AND WAS NO
LONGER CAPABLE OF PRODUCING LARGE HAIL OR DAMAGING WINDS. AS A
RESULT...THE WARNING HAS BEEN CANCELLED. HOWEVER...HEAVY RAIN AND 
DANGEROUS LIGHTNING STRIKES WILL CONTINUE TO BE POSSIBLE IN CENTRAL 
OSCEOLA COUNTY THROUGH 830 PM.

LAT...LON 2830 8098 2794 8088 2784 8127 2785 8128
      2787 8131 2790 8132 2792 8132 2794 8135
      2795 8135 2798 8138 2801 8140
TIME...MOT...LOC 2333Z 245DEG 14KT 2806 8116

$$


KELLY

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 4, 6:06 PM EDT	Special Marine Warning	MLB		62 min
Apr 4, 6:06 PM EDT	Special Weather Statement	MLB	Volusia	39 min
Apr 4, 6:41 PM EDT	Special Weather Statement	MLB	Osceola	64 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.