Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 8, NWS Melbourne, FL

April 20, 2012Indian River County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Apr 20, 2012, 4:08 PM EDT for Indian River County, Florida. It was in force for 67 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
Apr 20, 2012, 4:08 PM EDT (20:08 UTC)
Expired
Apr 20, 2012, 5:15 PM EDT
In force
67 min
Issued by
NWS Melbourne, FL
Area
Storm-based polygon

County Indian River County, FL

The radar

The Melbourne radar (KMLB), 48 km from the middle of the area, began a volume at 20:10 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
Apr 20, 4:50 PM EDTHAIL 0.88Vero Beach, FLNORTH VERO BEACH INTERNET STORM REPORT PEA TO NICKEL HAIL
Apr 20, 5:06 PM EDTTSTM WND GST 43Vero Beach, FLKVRB ASOS REPORTED WIND GUST OF 37KT/ 43 MPH.

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, 8.1 hours before the alert went out and 83 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 2012-04-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 414 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Cape Canaveral, FL at 12:00Z on 2012-04-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 3 square meters per square second.193958Sfc1 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
414 J/kg
Mixed-layer CIN
-31 J/kg
Mixed-layer LCL
861 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
3 m²/s²
0-3 km storm-relative helicity
22 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.

005 
WUUS52 KMLB 202008
SVRMLB
FLC061-202115-
/O.NEW.KMLB.SV.W.0008.120420T2008Z-120420T2115Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
408 PM EDT FRI APR 20 2012

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN INDIAN RIVER COUNTY IN FLORIDA

* UNTIL 515 PM EDT.

* AT 405 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
  WABASSO...AND MOVING SOUTHEAST AT 5 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...
  WINTER BEACH...GIFFORD...VERO BEACH SOUTH...VERO BEACH...INDIAN
  RIVER SHORES...VERO BEACH HIGHLANDS AND SOUTH 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 2756 8056 2785 8049 2784 8047 2782 8045
      2783 8044 2785 8046 2786 8044 2775 8038
      2763 8034 2762 8033 2756 8032
TIME...MOT...LOC 2008Z 277DEG 6KT 2776 8045

$$

SEDLOCK
2 follow-up statements
014 
WWUS52 KMLB 202041
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
441 PM EDT FRI APR 20 2012

FLC061-202115-
/O.CON.KMLB.SV.W.0008.000000T0000Z-120420T2115Z/
INDIAN RIVER-
441 PM EDT FRI APR 20 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR EASTERN INDIAN RIVER COUNTY...

AT 437 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 VERO BEACH AIRPORT...OR NEAR GIFFORD...MOVING SOUTHEAST 
AT 5 TO 10 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO JAYCEE
PARK...JAYCEE BEACH...VERO BEACH...STEVENS PARK...VERO BEACH SOUTH...
GROVENOR ESTATES...DIXIE HEIGHTS...VERO BEACH HIGHLANDS...FLORALTON
BEACH...SOUTH BEACH AND MOORINGS OF VERO BEACH

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

&&

LAT...LON 2756 8056 2781 8050 2781 8046 2781 8043
      2780 8042 2777 8039 2775 8038 2763 8034
      2762 8033 2756 8032
TIME...MOT...LOC 2041Z 327DEG 9KT 2765 8040

$$

SEDLOCK
632 
WWUS52 KMLB 202112
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
512 PM EDT FRI APR 20 2012

FLC061-202121-
/O.EXP.KMLB.SV.W.0008.000000T0000Z-120420T2115Z/
INDIAN RIVER-
512 PM EDT FRI APR 20 2012

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN INDIAN RIVER COUNTY
WILL EXPIRE AT 515 PM EDT...

THIS CLUSTER OF STORMS STILL CONTAINS FREQUENT CLOUD TO GROUND 
LIGHTNING...TORRENTIAL DOWNPOURS...SMALL HAIL AND GUSTY WINDS AS IT 
CONTINUES ACROSS SOUTHEAST INDIAN RIVER COUNTY...THOUGH IT IS NO 
LONGER SEVERE.

LAT...LON 2756 8056 2781 8050 2781 8046 2781 8043
      2780 8042 2777 8039 2775 8038 2763 8034
      2762 8033 2756 8032
TIME...MOT...LOC 2111Z 327DEG 9KT 2759 8035

$$

SEDLOCK

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 20, 3:06 PM EDTSevere Thunderstorm WarningMLBLake, Orange38 min
Apr 20, 3:56 PM EDTSpecial Weather StatementMLBLake, Orange, Osceola, Seminole64 min
Apr 20, 4:09 PM EDTSevere Thunderstorm WarningMLBOrange, Osceola66 min
Apr 20, 4:15 PM EDTSpecial Marine WarningMLB2 hr
Apr 20, 4:19 PM EDTSpecial Weather StatementMLBMartin41 min
Apr 20, 4:22 PM EDTSevere Thunderstorm WarningMLBOsceola53 min
Apr 20, 4:29 PM EDTSpecial Weather StatementMLBVolusia61 min
Apr 20, 4:35 PM EDTSevere Thunderstorm WarningMLBVolusia55 min
Apr 20, 4:43 PM EDTSevere Thunderstorm WarningMLBOkeechobee62 min
Apr 20, 5:04 PM EDTSevere Thunderstorm WarningMLBLake, Volusia56 min
Apr 20, 5:20 PM EDTSpecial Weather StatementMLBIndian River40 min
Apr 20, 5:34 PM EDTSpecial Marine WarningMLB116 min
Apr 20, 5:34 PM EDTSevere Thunderstorm WarningMLBBrevard, Osceola56 min
Apr 20, 5:39 PM EDTSevere Thunderstorm WarningMLBIndian River, Saint Lucie66 min
Apr 20, 5:59 PM EDTSpecial Marine WarningMLB2 hr
Apr 20, 6:36 PM EDTSevere Thunderstorm WarningMLBBrevard, Orange, Seminole, Volusia54 min
Apr 20, 6:49 PM EDTSpecial Weather StatementMLBMartin56 min
Apr 20, 7:37 PM EDTSpecial Weather StatementMLBBrevard53 min
Apr 20, 7:49 PM EDTSpecial Marine WarningMLB41 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.