Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 30, NWS Melbourne, FL

May 17, 2012Volusia County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at May 17, 2012, 7:14 PM EDT for Volusia County, Florida. It was in force for 61 min. 2 reports 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: May 17, 2012, 7:14 PM EDT (23:14 UTC)
Expired: May 17, 2012, 8:15 PM EDT
In force: 61 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon

County Volusia County, FL

The radar

The Melbourne radar (KMLB), 98 km from the middle of the area, began a volume at 23:16 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
May 17, 7:42 PM EDT	HAIL 0.88	4 Sse Deltona, FL
May 17, 7:45 PM EDT	HAIL 1.75	5 Ne Lake Ashby, FL	GOLF BALL SIZED HAIL AND ESTIMATED 60 MPH WINDS 3 MILES SE OF INTERSECTION OF SR-415 AND SR-44

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, 11.2 hours before the alert went out and 77 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: 74 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 866 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 25 m²/s²
0-3 km storm-relative helicity: 65 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.

266 
WUUS52 KMLB 172314
SVRMLB
FLC127-180015-
/O.NEW.KMLB.SV.W.0030.120517T2314Z-120518T0015Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
714 PM EDT THU MAY 17 2012

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN VOLUSIA COUNTY IN FLORIDA

* UNTIL 815 PM EDT.

* AT 711 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
  LAKE HELEN...AND MOVING SOUTHEAST AT 10 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO... 
  DELTONA...OSTEEN...NEW SMYRNA BEACH AND EDGEWATER.

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.

&&

LAT...LON 2903 8088 2899 8086 2876 8101 2877 8106
      2881 8107 2883 8112 2880 8113 2884 8126
      2889 8136 2889 8135 2895 8135 2910 8117
TIME...MOT...LOC 2314Z 296DEG 10KT 2902 8116

$$


KELLY

1 follow-up statement

792 
WWUS52 KMLB 172333
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
733 PM EDT THU MAY 17 2012

FLC127-180015-
/O.CON.KMLB.SV.W.0030.000000T0000Z-120518T0015Z/
VOLUSIA-
733 PM EDT THU MAY 17 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM EDT 
FOR SOUTHERN VOLUSIA COUNTY...

AT 725 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
DETECT A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR LAKE ASHBY...OR 6 MILES EAST OF LAKE HELEN...MOVING 
SOUTHEAST AT 20 MPH. 

ANOTHER STRONG TO SEVERE STORM NEAR ORANGE CITY WILL ALSO PUSH 
TOWARD THE EAST TO SOUTHEAST TOWARD DELTONA AND OSTEEN.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO 
DELTONA...OSTEEN...LAKE ASHBY...NEW SMYRNA BEACH AND EDGEWATER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

NATIONAL WEATHER SERVICE METEOROLOGISTS ALSO DETECTED 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.

&&

LAT...LON 2903 8088 2899 8086 2876 8101 2877 8106
      2881 8107 2883 8112 2880 8113 2884 8126
      2889 8136 2889 8135 2895 8135 2910 8117
TIME...MOT...LOC 2330Z 295DEG 16KT 2897 8111

$$


KELLY

The office that day

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

Issued	Product	Office	Counties	Lasted
May 17, 1:45 AM EDT	Tornado Warning	MLB	Martin, Saint Lucie	27 min
May 17, 2:34 AM EDT	Tornado Warning	MLB	Martin	41 min
May 17, 2:47 AM EDT	Special Marine Warning	MLB		58 min
May 17, 4:27 PM EDT	Special Marine Warning	MLB		63 min
May 17, 4:27 PM EDT	Special Weather Statement	MLB	Indian River	48 min
May 17, 5:37 PM EDT	Special Weather Statement	MLB	Indian River	38 min
May 17, 5:53 PM EDT	Special Weather Statement	MLB	Seminole	52 min
May 17, 5:55 PM EDT	Special Weather Statement	MLB	Martin	50 min
May 17, 5:59 PM EDT	Special Weather Statement	MLB	Volusia	46 min
May 17, 6:14 PM EDT	Severe Thunderstorm Warning	MLB	Lake, Volusia	61 min
May 17, 6:27 PM EDT	Severe Thunderstorm Warning	MLB	Brevard	63 min
May 17, 6:30 PM EDT	Special Marine Warning	MLB		2 hr
May 17, 6:47 PM EDT	Special Weather Statement	MLB	Volusia	43 min
May 17, 6:53 PM EDT	Severe Thunderstorm Warning	MLB	Lake, Volusia	37 min
May 17, 7:32 PM EDT	Special Weather Statement	MLB	Brevard	43 min
May 17, 7:39 PM EDT	Severe Thunderstorm Warning	MLB	Brevard	51 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.