Alert archive / Florida / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 33, NWS Melbourne, FL

May 13, 2011Brevard County, Seminole County, Volusia County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at May 13, 2011, 7:32 PM EDT for Brevard County, Seminole County, Volusia County, Florida. It was in force for 43 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: May 13, 2011, 7:32 PM EDT (23:32 UTC)
Expired: May 13, 2011, 8:15 PM EDT
In force: 43 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), 80 km from the middle of the area, began a volume at 23:33 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 13, 7:39 PM EDT	HAIL 0	Oviedo, FL	CENTRAL FLORIDA NEWS 13 REPORTED PENNY SIZE HAIL.
May 13, 7:39 PM EDT	HAIL 0.25	Oviedo, FL	CENTRAL FLORIDA NEWS 13 REPORTED PEA SIZE HAIL
May 13, 7:39 PM EDT	HAIL 0.75	Oviedo, FL	CENTRAL FLORIDA NEWS 13 REPORTED PENNY SIZE HAIL. CORRECTED FROM PREVIOUS REPORT TO INCLUDE SIZE.
May 13, 7:58 PM EDT	HAIL 0.88	2 Nw Chuluota, FL	NICKEL SIZE HAIL OCCURRED FOR 15 MINUTES.

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, 11.5 hours before the alert went out and 51 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: 53 J/kg
Mixed-layer CIN: -288 J/kg
Mixed-layer LCL: 1251 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 98 m²/s²
0-3 km storm-relative helicity: 129 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.

453 
WUUS52 KMLB 132332
SVRMLB
FLC009-117-127-140015-
/O.NEW.KMLB.SV.W.0033.110513T2332Z-110514T0015Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
732 PM EDT FRI MAY 13 2011

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 815 PM EDT.

* AT 729 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED NEAR GENEVA...AND MOVING
  NORTHEAST AT 10 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...
  OSTEEN...OAK HILL...KLONDIKE BEACH...ELDORA...SCOTTSMOOR...
  MAYTOWN...HAULOVER CANAL...EDGEWATER AND APOLLO 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 2886 8083 2889 8081 2895 8084 2873 8069
      2875 8073 2887 8080 2886 8082 2883 8081
      2872 8073 2871 8075 2879 8084 2869 8083
      2864 8121 2877 8130 2901 8091
TIME...MOT...LOC 2332Z 238DEG 8KT 2874 8115

$$



BRAGAW

The office that day

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

Issued	Product	Office	Counties	Lasted
May 13, 6:04 PM EDT	Severe Thunderstorm Warning	MLB	Lake, Orange	28 min
May 13, 6:35 PM EDT	Special Weather Statement	MLB	Volusia	40 min
May 13, 6:53 PM EDT	Severe Thunderstorm Warning	MLB	Orange, Osceola	52 min
May 13, 7:45 PM EDT	Severe Thunderstorm Warning	MLB	Orange, Seminole	45 min
May 13, 7:53 PM EDT	Severe Thunderstorm Warning	MLB	Seminole, Volusia	37 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.