Alert archive / Florida / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 28, NWS Melbourne, FL

April 28, 2011Brevard County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Apr 28, 2011, 6:48 PM EDT for Brevard County, Florida. It was in force for 42 min. 4 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: Apr 28, 2011, 6:48 PM EDT (22:48 UTC)
Expired: Apr 28, 2011, 7:30 PM EDT
In force: 42 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon

County Brevard County, FL

The radar

The Melbourne radar (KMLB), 48 km from the middle of the area, began a volume at 22:48 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
Apr 28, 6:50 PM EDT	HAIL 0.88	Port Saint John, FL	NICKEL SIZE HAIL
Apr 28, 6:55 PM EDT	HAIL 1.75	Titusville, FL	ESTIMATED GOLF BALL SIZED HAIL.
Apr 28, 7:09 PM EDT	TSTM WND GST 62	Kennedy Space Center, FL
Apr 28, 7:34 PM EDT	HAIL 0.25	Titusville, FL	PEA SIZE HAIL IN THE TITUSVILLE AREA.

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, 10.8 hours before the alert went out and 23 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: 671 J/kg
Mixed-layer CIN: -81 J/kg
Mixed-layer LCL: 1082 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 46 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

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

619 
WUUS52 KMLB 282248
SVRMLB
FLC009-282330-
/O.NEW.KMLB.SV.W.0028.110428T2248Z-110428T2330Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
648 PM EDT THU APR 28 2011

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN BREVARD COUNTY IN FLORIDA

* UNTIL 730 PM EDT.

* AT 643 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED 
  A SEVERE THUNDERSTORM CAPABLE OF PRODUCING LARGE HAIL AND DAMAGING 
  WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR TITUSVILLE
  AIRPORT...AND MOVING NORTHEAST AT 25 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...
  MIMS...KENNEDY SPACE CENTER...MERRITT ISLAND WILDLIFE REFUGE...
  KLONDIKE BEACH AND PLAYALINDA BEACH

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.

&&

LAT...LON 2842 8062 2858 8061 2840 8066 2838 8072
      2849 8074 2837 8073 2833 8084 2863 8097
      2869 8083 2849 8076 2849 8075 2860 8073
      2862 8079 2869 8079 2873 8074 2866 8067
      2875 8070 2846 8052
TIME...MOT...LOC 2246Z 239DEG 20KT 2853 8079

$$
RL

2 follow-up statements

767 
WWUS52 KMLB 282311
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
711 PM EDT THU APR 28 2011

FLC009-282330-
/O.CON.KMLB.SV.W.0028.000000T0000Z-110428T2330Z/
BREVARD-
711 PM EDT THU APR 28 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM EDT
FOR NORTHERN BREVARD COUNTY...

AT 705 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
DETECT A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR MERRITT ISLAND
WILDLIFE REFUGE...OR NEAR PLAYALINDA BEACH...MOVING NORTHEAST AT 15
MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO 
KLONDIKE BEACH.

THE PUBLIC REPORTED QUARTER TO GOLF BALL SIZED HAIL AS THE STORM MOVED
ACROSS THE TITUSVILLE AREA ABOUT 655 PM.

LAT...LON 2842 8062 2858 8061 2840 8066 2838 8072
      2849 8074 2837 8073 2833 8084 2863 8097
      2869 8083 2849 8076 2849 8075 2860 8073
      2862 8079 2869 8079 2873 8074 2866 8067
      2875 8070 2846 8052
TIME...MOT...LOC 2310Z 239DEG 20KT 2860 8066

$$
RL

081 
WWUS52 KMLB 282341
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
741 PM EDT THU APR 28 2011

FLC009-282349-
/O.EXP.KMLB.SV.W.0028.000000T0000Z-110428T2330Z/
BREVARD-
741 PM EDT THU APR 28 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN BREVARD COUNTY HAS
EXPIRED...

THE SEVERE STORM THAT PROMPTED THE WARNING HAD WEAKENED AND EXITED 
THE WARNING AREA...THUS THE WARNING HAS BEEN ALLOWED TO EXPIRE. 
HEAVY RAIN AND GUSTY WINDS HAD PUSHED OFFSHORE THE CANAVERAL 
NATIONAL SEASHORE.

SEVERAL REPORTS OF GOLF BALL TO QUARTER SIZE HAIL WERE RECEIVED AS
THE STORM MOVED ACROSS TITUSVILLE AND THE NORTH SIDE OF CAPE 
CANAVERAL.

LAT...LON 2842 8062 2858 8061 2840 8066 2838 8072
      2849 8074 2837 8073 2833 8084 2863 8097
      2869 8083 2849 8076 2849 8075 2860 8073
      2862 8079 2869 8079 2873 8074 2866 8067
      2875 8070 2846 8052
TIME...MOT...LOC 2311Z 239DEG 20KT 2860 8065

$$
RL

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 28, 3:14 PM EDT	Special Weather Statement	MLB	Volusia	46 min
Apr 28, 3:30 PM EDT	Special Marine Warning	MLB		110 min
Apr 28, 4:11 PM EDT	Severe Thunderstorm Warning	MLB	Indian River, Saint Lucie	24 min
Apr 28, 5:44 PM EDT	Special Weather Statement	MLB	Okeechobee, Osceola	61 min
Apr 28, 6:18 PM EDT	Special Weather Statement	MLB	Brevard, Indian River	57 min
Apr 28, 6:37 PM EDT	Special Marine Warning	MLB		53 min
Apr 28, 6:54 PM EDT	Severe Thunderstorm Warning	MLB	Okeechobee	51 min
Apr 28, 7:52 PM EDT	Special Weather Statement	MLB	Saint Lucie	38 min

Nearby

Severe Thunderstorm Warnings in Florida, 2011 Every severe thunderstorm warning in 2011

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.