Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 18, NWS Melbourne, FL

May 7, 2012Volusia County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at May 7, 2012, 1:25 PM EDT for Volusia County, Florida. It was in force for 20 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: May 7, 2012, 1:25 PM EDT (17:25 UTC)
Expired: May 7, 2012, 1:45 PM EDT
In force: 20 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon

County Volusia County, FL

The radar

The Melbourne radar (KMLB), 93 km from the middle of the area, began a volume at 17:27 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, 5.4 hours before the alert went out and 71 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: 876 J/kg
Mixed-layer CIN: -60 J/kg
Mixed-layer LCL: 1085 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 37 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.

720 
WUUS52 KMLB 071725
SVRMLB
FLC127-071815-
/O.NEW.KMLB.SV.W.0018.120507T1725Z-120507T1815Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
125 PM EDT MON MAY 7 2012

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTH CENTRAL VOLUSIA COUNTY IN FLORIDA

* UNTIL 215 PM EDT.

* AT 122 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
  DELTONA...AND MOVING SOUTHEAST AT 10 MPH.

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

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 2882 8093 2882 8109 2883 8111 2882 8112
      2893 8123 2903 8106
TIME...MOT...LOC 1725Z 318DEG 11KT 2892 8111

$$


KELLY

1 follow-up statement

748 
WWUS52 KMLB 071745
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
145 PM EDT MON MAY 7 2012

FLC127-071755-
/O.CAN.KMLB.SV.W.0018.000000T0000Z-120507T1815Z/
VOLUSIA-
145 PM EDT MON MAY 7 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL VOLUSIA 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.

LAT...LON 2882 8093 2882 8109 2883 8111 2882 8112
      2893 8123 2903 8106
TIME...MOT...LOC 1745Z 318DEG 11KT 2887 8106

$$


KELLY

The office that day

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

Issued	Product	Office	Counties	Lasted
May 7, 12:47 PM EDT	Special Weather Statement	MLB	Volusia	43 min
May 7, 1:21 PM EDT	Special Weather Statement	MLB	Volusia	39 min
May 7, 2:13 PM EDT	Special Weather Statement	MLB	Seminole	47 min
May 7, 3:21 PM EDT	Special Marine Warning	MLB		114 min
May 7, 3:24 PM EDT	Special Weather Statement	MLB	Indian River	51 min
May 7, 3:35 PM EDT	Special Weather Statement	MLB	Lake, Orange	55 min
May 7, 4:05 PM EDT	Special Weather Statement	MLB	Brevard	55 min
May 7, 5:10 PM EDT	Special Marine Warning	MLB		2 hr
May 7, 6:17 PM EDT	Special Weather Statement	MLB	Martin	58 min
May 7, 7:17 PM EDT	Special Weather Statement	MLB	Martin	58 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.