Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 85, NWS Melbourne, FL

August 21, 2012Brevard County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Aug 21, 2012, 2:53 PM EDT for Brevard County, Florida. It was in force for 37 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
Aug 21, 2012, 2:53 PM EDT (18:53 UTC)
Expired
Aug 21, 2012, 3:30 PM EDT
In force
37 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 18:56 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

TimeReportWhereRemark
Aug 21, 2:59 PM EDTTSTM WND GST 684 Sw Playalinda Beach, FLKTTS AT THE KENNEDY SPACE CENTER LANDING FACILITY MEASURED A 59 KT/68 MPH THUNDERSTORM WIND GUST.
Aug 21, 3:05 PM EDTTSTM WND GST 624 Sw Playalinda Beach, FLUSAF TOWER 511 30 FEET

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, 6.9 hours before the alert went out and 22 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-pSkew-T log-p diagram, Cape Canaveral, FL at 12:00Z on 2012-08-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 318 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Cape Canaveral, FL at 12:00Z on 2012-08-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 36 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
318 J/kg
Mixed-layer CIN
-106 J/kg
Mixed-layer LCL
1227 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
36 m²/s²
0-3 km storm-relative helicity
44 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.

299 
WUUS52 KMLB 211853
SVRMLB
FLC009-211930-
/O.NEW.KMLB.SV.W.0085.120821T1853Z-120821T1930Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
253 PM EDT TUE AUG 21 2012

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

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

* UNTIL 330 PM EDT.

* AT 251 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
  CAPE CANAVERAL...AND MOVING NORTHEAST AT 20 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...
  PORT CANAVERAL...KENNEDY SPACE CENTER...MERRITT ISLAND WILDLIFE
  REFUGE...HAULOVER CANAL...PLAYALINDA BEACH AND KLONDIKE 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 2832 8064 2838 8062 2840 8065 2832 8065
      2829 8071 2855 8079 2854 8074 2857 8072
      2862 8079 2857 8080 2864 8079 2873 8085
      2871 8075 2874 8077 2868 8066 2875 8071
      2875 8070 2859 8057 2845 8052
TIME...MOT...LOC 1853Z 231DEG 16KT 2843 8065

$$


WEITLICH
1 follow-up statement
509 
WWUS52 KMLB 211904
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
304 PM EDT TUE AUG 21 2012

FLC009-211930-
/O.CON.KMLB.SV.W.0085.000000T0000Z-120821T1930Z/
BREVARD-
304 PM EDT TUE AUG 21 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EDT
FOR NORTHEASTERN BREVARD COUNTY...

AT 300 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
DETECT A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN 
EXCESS OF 60 MPH. AN OBSERVATION AT THE SHUTTLE LANDING FACILITY 
REPORTED A WIND GUST OF 68 MPH. THIS STORM WAS LOCATED NEAR KENNEDY 
SPACE CENTER...OR 8 MILES NORTHWEST OF PORT CANAVERAL...MOVING 
NORTHEAST AT 20 MPH.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

&&

LAT...LON 2832 8064 2838 8062 2840 8065 2832 8065
      2829 8071 2855 8079 2854 8074 2857 8072
      2862 8079 2857 8080 2864 8079 2873 8085
      2871 8075 2874 8077 2868 8066 2875 8071
      2875 8070 2859 8057 2845 8052
TIME...MOT...LOC 1903Z 231DEG 16KT 2852 8063

$$


WEITLICH

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 20, 11:28 PM EDTSpecial Weather StatementMLBOrange47 min
Aug 21, 1:33 PM EDTSpecial Weather StatementMLBLake57 min
Aug 21, 2:39 PM EDTSpecial Marine WarningMLB66 min
Aug 21, 3:10 PM EDTSpecial Marine WarningMLB2 hr
Aug 21, 3:12 PM EDTAreal Flood AdvisoryMLBLake93 min
Aug 21, 3:15 PM EDTSevere Thunderstorm WarningMLBBrevard, Volusia45 min
Aug 21, 3:25 PM EDTSevere Thunderstorm WarningMLBLake, Orange, Seminole, Volusia31 min
Aug 21, 3:37 PM EDTSpecial Weather StatementMLBBrevard, Indian River, Lake, Martin, Okeechobee, Orange and 4 more53 min
Aug 21, 3:41 PM EDTSpecial Marine WarningMLB94 min
Aug 21, 3:54 PM EDTAreal Flood AdvisoryMLBLake, Orange, Seminole, Volusia81 min
Aug 21, 4:24 PM EDTSevere Thunderstorm WarningMLBOkeechobee45 min
Aug 21, 4:37 PM EDTSpecial Weather StatementMLBBrevard, Indian River, Martin, Okeechobee, Osceola, Saint Lucie53 min
Aug 21, 4:37 PM EDTSevere Thunderstorm WarningMLBBrevard38 min
Aug 21, 4:49 PM EDTSevere Thunderstorm WarningMLBMartin, Okeechobee, Saint Lucie34 min
Aug 21, 5:06 PM EDTSpecial Marine WarningMLB84 min
Aug 21, 5:06 PM EDTSevere Thunderstorm WarningMLBIndian River24 min
Aug 21, 5:08 PM EDTSpecial Marine WarningMLB82 min
Aug 21, 5:12 PM EDTSevere Thunderstorm WarningMLBBrevard, Osceola20 min

Nearby

Severe Thunderstorm Warnings in Florida, 2012Every 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.