Alert archive / Florida / Special Weather Statements in 2012

Special Weather Statement, NWS Miami, FL

April 20, 2012Hendry County, Florida

NWS Miami, FL issued this special weather statement at Apr 20, 2012, 2:48 PM EDT for Hendry County, Florida. It was in force for 27 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
Apr 20, 2012, 2:48 PM EDT (18:48 UTC)
Expired
Apr 20, 2012, 3:15 PM EDT
In force
27 min
Issued by
NWS Miami, FL

County Hendry County, FL

The radar

The Miami radar (KAMX), 146 km from the middle of the area, began a volume at 18:51 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, 6.8 hours before the alert went out and 142 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 2012-04-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 467 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 2012-04-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 12 square meters per square second.19395878Sfc1 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
467 J/kg
Mixed-layer CIN
-28 J/kg
Mixed-layer LCL
954 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
12 m²/s²
0-3 km storm-relative helicity
12 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.

568 
WWUS82 KMFL 201848
SPSMFL

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
248 PM EDT FRI APR 20 2012

FLZ066-070-201915-
HENDRY FL INLAND COLLIER COUNTY FL 
248 PM EDT FRI APR 20 2012

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

* SIGNIFICANT WEATHER ADVISORY FOR...
  WEST CENTRAL HENDRY COUNTY 
  NORTH CENTRAL COLLIER COUNTY 

* UNTIL 315 PM EDT

* AT 246 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  STRONG THUNDERSTORM 9 MILES EAST OF INTERSECTION ALLIGATOR ALLEY   
AND SR 29. THIS STORM WAS MOVING NORTHEAST AT 10 MPH.

FREQUENT TO EXCESSIVE LIGHTNING...GUSTY WINDS UP TO 45 MPH...UP TO 
NICKEL-SIZED HAIL...TORRENTIAL DOWNPOURS...OR A COMBINATION OF THESE 
ARE POSSIBLE. LIGHTNING IS THE NUMBER ONE WEATHER RELATED KILLER IN 
FLORIDA. TREES AND OPEN SHELTERS OFFER NO PROTECTION. THESE WINDS 
CAN DOWN SMALL TREE LIMBS AND BRANCHES...AND BLOW AROUND UNSECURED 
SMALL OBJECTS. SEEK SHELTER IN A SAFE BUILDING UNTIL THE STORM 
PASSES.

LAT...LON 2643 8159 2643 8157 2650 8157 2668 8151
      2657 8121 2632 8146 2641 8160
TIME...MOT...LOC 1848Z 180DEG 0KT 2615 8120

$$

AK

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 20, 3:25 PM EDTSpecial Weather StatementMFLHendry35 min
Apr 20, 4:06 PM EDTSpecial Weather StatementMFLGlades24 min
Apr 20, 4:12 PM EDTSpecial Weather StatementMFLMiami-Dade33 min
Apr 20, 4:39 PM EDTSpecial Weather StatementMFLBroward36 min
Apr 20, 4:44 PM EDTSpecial Weather StatementMFLMartin31 min
Apr 20, 4:49 PM EDTSpecial Marine WarningMFL56 min
Apr 20, 4:58 PM EDTSpecial Weather StatementMFLMartin32 min
Apr 20, 5:36 PM EDTSpecial Weather StatementMFLPalm Beach39 min
Apr 20, 5:40 PM EDTSpecial Marine WarningMFL2 hr
Apr 20, 6:27 PM EDTSpecial Weather StatementMFLBroward48 min
Apr 20, 6:36 PM EDTSpecial Weather StatementMFLPalm Beach24 min
Apr 20, 7:03 PM EDTSpecial Weather StatementMFLPalm Beach27 min
Apr 20, 7:10 PM EDTSpecial Marine WarningMFL65 min
Apr 20, 7:14 PM EDTSpecial Weather StatementMFLBroward31 min
Apr 20, 7:19 PM EDTSevere Thunderstorm WarningMFLBroward19 min
Apr 20, 7:42 PM EDTSpecial Weather StatementMFLBroward33 min

Nearby

Special Weather Statements in Florida, 2012Every special weather statement 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.