Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 32, NWS Melbourne, FL

May 17, 2012Brevard County, Seminole County, Volusia County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at May 17, 2012, 8:00 PM EDT for Brevard County, Seminole County, Volusia County, Florida. It was in force for 60 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, 8:00 PM EDT (00:00 UTC)
Expired: May 17, 2012, 9:00 PM EDT
In force: 60 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon

Counties Brevard County, FL, Seminole County, FL, Volusia County, FL

The radar

The Melbourne radar (KMLB), 79 km from the middle of the area, began a volume at 00:02 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, 8:32 PM EDT	HAIL 1.75	1 Nnw Scottsmoor, FL	QUARTER TO GOLF BALL SIZED HAIL
May 17, 8:45 PM EDT	TSTM WND GST 47	4 Nw Haulover Canal, FL	USAF 54 FT WIND TOWER NUMBER 421 MEASURED WIND GUST OF 41 KT/47 MPH

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Tampa Bay, FL (KTBW), launched 00:00Z, 0.0 hours before the alert went out and 196 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: 987 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 1110 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: -7 m²/s²
0-3 km storm-relative helicity: 21 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

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

268 
WUUS52 KMLB 180000
SVRMLB
FLC009-117-127-180100-
/O.NEW.KMLB.SV.W.0032.120518T0000Z-120518T0100Z/

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

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN BREVARD COUNTY IN FLORIDA
  EASTERN SEMINOLE COUNTY IN FLORIDA
  SOUTHEASTERN VOLUSIA COUNTY IN FLORIDA

* UNTIL 900 PM EDT.

* AT 758 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   
OSTEEN...AND MOVING SOUTHEAST AT 20 MPH. ANOTHER STRONG TO SEVERE 
STORM WILL APPROACH EDGEWATER AND OAK HILL FROM THE WEST.

* OTHER LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...
  GENEVA...EDGEWATER...MAYTOWN...OAK HILL...SCOTTSMOOR AND HAULOVER  
  CANAL.

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 2905 8090 2885 8080 2885 8081 2881 8078
      2883 8078 2880 8076 2880 8078 2873 8074
      2872 8076 2874 8078 2877 8084 2869 8082
      2861 8099 2880 8124
TIME...MOT...LOC 2359Z 303DEG 17KT 2882 8108

$$


KELLY

2 follow-up statements

071 
WWUS52 KMLB 180024
SVSMLB

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

FLC009-117-127-180100-
/O.CON.KMLB.SV.W.0032.000000T0000Z-120518T0100Z/
SEMINOLE-VOLUSIA-BREVARD-
824 PM EDT THU MAY 17 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM EDT
FOR NORTHWESTERN BREVARD...SOUTHEASTERN VOLUSIA AND EASTERN SEMINOLE
COUNTIES...

AT 821 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 SCOTTSMOOR...MOVING SOUTHEAST AT 25 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO 
AURANTIA...TURNBULL...SHILOH AND HAULOVER CANAL.

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 2905 8090 2885 8080 2885 8081 2881 8078
      2883 8078 2880 8076 2880 8078 2873 8074
      2872 8076 2874 8078 2877 8084 2869 8082
      2861 8099 2880 8124
TIME...MOT...LOC 0024Z 299DEG 21KT 2874 8089

$$


KELLY

184 
WWUS52 KMLB 180055
SVSMLB

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

FLC009-117-127-180103-
/O.EXP.KMLB.SV.W.0032.000000T0000Z-120518T0100Z/
SEMINOLE-VOLUSIA-BREVARD-
855 PM EDT THU MAY 17 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN BREVARD...
SOUTHEASTERN VOLUSIA AND EASTERN SEMINOLE COUNTIES WILL EXPIRE AT 900
PM EDT...

GUSTY WINDS...DANGEROUS LIGHTNING...SMALL HAIL AND VERY HEAVY RAIN 
WILL CONTINUE TO BE POSSIBLE THROUGH 930 PM.

LAT...LON 2905 8090 2885 8080 2885 8081 2881 8078
      2883 8078 2880 8076 2880 8078 2873 8074
      2872 8076 2874 8078 2877 8084 2869 8082
      2861 8099 2880 8124
TIME...MOT...LOC 0053Z 299DEG 21KT 2866 8072

$$


KELLY

The office that day

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

Issued	Product	Office	Counties	Lasted
May 17, 8:13 PM EDT	Special Marine Warning	MLB		2 hr
May 17, 8:16 PM EDT	Special Weather Statement	MLB	Orange, Seminole	44 min
May 17, 8:58 PM EDT	Special Weather Statement	MLB	Seminole	47 min
May 17, 9:29 PM EDT	Severe Thunderstorm Warning	MLB	Brevard, Orange	51 min
May 17, 9:43 PM EDT	Special Marine Warning	MLB		76 min
May 18, 4:50 PM EDT	Special Weather Statement	MLB	Brevard	40 min
May 18, 4:57 PM EDT	Severe Thunderstorm Warning	MLB	Orange, Osceola	35 min
May 18, 5:44 PM EDT	Special Weather Statement	MLB	Brevard	46 min
May 18, 6:03 PM EDT	Special Weather Statement	MLB	Okeechobee	42 min
May 18, 6:34 PM EDT	Severe Thunderstorm Warning	MLB	Okeechobee, Saint Lucie	42 min
May 18, 6:54 PM EDT	Special Weather Statement	MLB	Martin	66 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.