Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 20, NWS Melbourne, FL

May 8, 2012Martin County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at May 8, 2012, 4:53 PM EDT for Martin County, Florida. It was in force for 38 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
May 8, 2012, 4:53 PM EDT (20:53 UTC)
Expired
May 8, 2012, 5:31 PM EDT
In force
38 min
Issued by
NWS Melbourne, FL
Area
Storm-based polygon

County Martin County, FL

The radar

The Melbourne radar (KMLB), 120 km from the middle of the area, began a volume at 20:54 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.

The nearest sounding before it

Miami, FL (KMFL), launched 12:00Z, 8.9 hours before the alert went out and 137 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, Miami, FL at 12:00Z on 2012-05-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 33 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, Miami, FL at 12:00Z on 2012-05-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 22 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
33 J/kg
Mixed-layer CIN
-74 J/kg
Mixed-layer LCL
1310 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
22 m²/s²
0-3 km storm-relative helicity
92 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

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

296 
WUUS52 KMLB 082053
SVRMLB
FLC085-082145-
/O.NEW.KMLB.SV.W.0020.120508T2053Z-120508T2145Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
453 PM EDT TUE MAY 8 2012

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL MARTIN COUNTY IN FLORIDA

* UNTIL 545 PM EDT.

* AT 450 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 6 MILES
  NORTH OF INDIANTOWN...AND MOVING SOUTHWEST AT 15 MPH.

* OTHER AREAS IN THE WARNING INCLUDE...STATE ROUTE 710...STATE ROUTE 
  76...STATE ROUTE 714...AND INTERSTATE 95 BETWEEN MILE MARKERS      
  100 AND 115.

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 2708 8059 2719 8041 2704 8025 2695 8029
      2695 8046
TIME...MOT...LOC 2052Z 038DEG 11KT 2710 8045

$$


MOSES
2 follow-up statements
868 
WWUS52 KMLB 082117
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
517 PM EDT TUE MAY 8 2012

FLC085-082145-
/O.CON.KMLB.SV.W.0020.000000T0000Z-120508T2145Z/
MARTIN-
517 PM EDT TUE MAY 8 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR CENTRAL MARTIN COUNTY...

AT 513 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 7 MILES NORTHEAST OF INDIANTOWN...MOVING SOUTHEAST AT 10 MPH.

ADDITIONAL STRONG STORMS ARE DEVELOPING IN THE WARNING AREA AND MAY 
ALSO BECOME SEVERE. 

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 2708 8059 2719 8041 2704 8025 2695 8029
      2695 8046
TIME...MOT...LOC 2116Z 319DEG 7KT 2708 8038

$$


MOSES
194 
WWUS52 KMLB 082131
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
531 PM EDT TUE MAY 8 2012

FLC085-082141-
/O.CAN.KMLB.SV.W.0020.000000T0000Z-120508T2145Z/
MARTIN-
531 PM EDT TUE MAY 8 2012

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL MARTIN COUNTY IS
CANCELLED...

THE SEVERE STORM THAT PROMPTED THE WARNING HAD WEAKENED AND WAS NO
LONGER CAPABLE OF PRODUCING LARGE HAIL OR DAMAGING WINDS. AS A
RESULT...THE WARNING HAS BEEN CANCELLED. HOWEVER...HEAVY RAIN AND
DANGEROUS LIGHTNING STRIKES WILL CONTINUE TO BE POSSIBLE.

LAT...LON 2708 8059 2719 8041 2704 8025 2695 8029
      2695 8046
TIME...MOT...LOC 2131Z 319DEG 7KT 2706 8036

$$


MOSES

The office that day

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

IssuedProductOfficeCountiesLasted
May 8, 2:30 PM EDTSpecial Weather StatementMLBMartin45 min
May 8, 2:45 PM EDTSpecial Marine WarningMLB2 hr
May 8, 3:09 PM EDTSpecial Weather StatementMLBSaint Lucie66 min
May 8, 3:35 PM EDTSevere Thunderstorm WarningMLBMartin, Saint Lucie21 min
May 8, 4:47 PM EDTSpecial Weather StatementMLBMartin58 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.