Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 42, NWS Miami, FL

May 19, 2012Broward County, Collier County, Hendry County, Florida

NWS Miami, FL issued this severe thunderstorm warning at May 19, 2012, 6:03 PM EDT for Broward County, Collier County, Hendry County, Florida. It was in force for 42 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 19, 2012, 6:03 PM EDT (22:03 UTC)
Expired
May 19, 2012, 6:45 PM EDT
In force
42 min
Issued by
NWS Miami, FL
Area
Storm-based polygon

Counties Broward County, FL, Collier County, FL, Hendry County, FL

The radar

The Miami radar (KAMX), 96 km from the middle of the area, began a volume at 22:03 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, 10.1 hours before the alert went out and 91 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 2012-05-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1791 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 2012-05-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 2 square meters per square second.1939587897Sfc1 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
1791 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
625 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
2 m²/s²
0-3 km storm-relative helicity
51 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.9

Open this sounding in Storm Lab

The text

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

046 
WUUS52 KMFL 192203
SVRMFL
FLC011-021-051-192245-
/O.NEW.KMFL.SV.W.0042.120519T2203Z-120519T2245Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIAMI FL
603 PM EDT SAT MAY 19 2012

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  FAR NORTHWESTERN BROWARD COUNTY IN SOUTH FLORIDA.
  SOUTHEASTERN HENDRY COUNTY IN SOUTH FLORIDA.
  EASTERN COLLIER COUNTY IN SOUTH FLORIDA.

* UNTIL 645 PM EDT

* AT 559 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
  LOCATED ALONG A LINE EXTENDING FROM 9 MILES NORTHWEST OF BIG
  CYPRESS SEMINOLE INDIAN RESERVATION TO 5 MILES SOUTHWEST OF MILE
  MARKER 90 ON ALLIGATOR ALLEY...AND MOVING SOUTHEAST AT 25 MPH.

* THE LINE OF STORMS WILL AFFECT...
  INTERSECTION ALLIGATOR ALLEY AND SR 29...
  BIG CYPRESS SEMINOLE INDIAN RESERVATION...
  MILE MARKER 60 ON ALLIGATOR ALLEY...
  AND SURROUNDING COMMUNITIES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS IN EXCESS OF 58 MPH AND
OR LARGE HAIL. FREQUENT TO EXCESSIVE LIGHTNING AND HEAVY RAINFALL IS
ALSO POSSIBLE. IF THE STORM APPROACHES YOUR LOCATION, SEEK SHELTER IN
AN ENCLOSED BUILDING ON THE LOWEST FLOOR AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 2641 8098 2627 8079 2606 8100 2587 8126
      2615 8149 2646 8107
TIME...MOT...LOC 2203Z 300DEG 20KT 2641 8101 2610 8138

$$

MJB
2 follow-up statements
050 
WWUS52 KMFL 192221
SVSMFL

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
621 PM EDT SAT MAY 19 2012

FLC011-021-051-192245-
/O.CON.KMFL.SV.W.0042.000000T0000Z-120519T2245Z/
HENDRY FL-BROWARD FL-COLLIER FL-
621 PM EDT SAT MAY 19 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM EDT
FOR EASTERN COLLIER...NORTHWESTERN BROWARD AND SOUTHEASTERN HENDRY
COUNTIES...

AT 621 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING LARGE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM BIG CYPRESS SEMINOLE INDIAN
RESERVATION TO DEEP LAKE...MOVING SOUTHEAST AT 25 MPH.

SEVERE THUNDERSTORMS CAN PRODUCE VERY STRONG WINDS IN EXCESS OF 58
MPH...LARGE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAINFALL. STAY
INSIDE AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.

LAT...LON 2641 8098 2627 8079 2606 8100 2587 8126
      2615 8149 2646 8107
TIME...MOT...LOC 2222Z 300DEG 20KT 2634 8092 2607 8135

$$

MJB
021 
WWUS52 KMFL 192244
SVSMFL

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
644 PM EDT SAT MAY 19 2012

FLC011-021-051-192249-
/O.EXP.KMFL.SV.W.0042.000000T0000Z-120519T2245Z/
HENDRY FL-BROWARD FL-COLLIER FL-
644 PM EDT SAT MAY 19 2012

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN COLLIER...NORTHWESTERN
BROWARD AND SOUTHEASTERN HENDRY COUNTIES WILL EXPIRE AT 645 PM EDT...

NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATES THE LINE OF 
THUNDERSTORMS HAS WEAKENED. THUS THE THUNDERSTORM WARNING WILL 
EXPIRE AT 645 PM EDT. HOWEVER, VERY HEAVY RAINFALL, GUSTY WINDS OF 
40 TO 50 MPH, SMALL HAIL, AND LIGHTNING STRIKES ARE STILL 
POSSIBLE AS THESE STORMS MOVE SOUTHEAST.

LAT...LON 2641 8098 2627 8079 2606 8100 2587 8126
      2615 8149 2646 8107
TIME...MOT...LOC 2239Z 300DEG 20KT 2629 8083 2602 8126

$$

MJB

The office that day

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

IssuedProductOfficeCountiesLasted
May 19, 12:37 PM EDTAreal Flood AdvisoryMFLBroward, Miami-Dade2 hr
May 19, 2:02 PM EDTSpecial Weather StatementMFLPalm Beach43 min
May 19, 2:04 PM EDTSpecial Weather StatementMFLBroward26 min
May 19, 2:10 PM EDTSevere Thunderstorm WarningMFLPalm Beach22 min
May 19, 2:11 PM EDTSpecial Weather StatementMFLPalm Beach34 min
May 19, 2:43 PM EDTSpecial Weather StatementMFLPalm Beach47 min
May 19, 2:45 PM EDTSpecial Weather StatementMFLBroward30 min
May 19, 3:04 PM EDTSpecial Weather StatementMFLBroward56 min
May 19, 3:12 PM EDTSpecial Weather StatementMFLPalm Beach48 min
May 19, 3:16 PM EDTSevere Thunderstorm WarningMFLPalm Beach44 min
May 19, 3:35 PM EDTSpecial Marine WarningMFL43 min
May 19, 3:47 PM EDTSevere Thunderstorm WarningMFLPalm Beach16 min
May 19, 3:54 PM EDTSpecial Weather StatementMFLMonroe36 min
May 19, 4:29 PM EDTSpecial Weather StatementMFLMonroe61 min
May 19, 4:31 PM EDTSpecial Weather StatementMFLMiami-Dade44 min
May 19, 4:32 PM EDTSpecial Weather StatementMFLBroward43 min
May 19, 4:34 PM EDTSpecial Marine WarningMFL86 min
May 19, 4:34 PM EDTSpecial Weather StatementMFLHendry41 min
May 19, 4:39 PM EDTSevere Thunderstorm WarningMFLGlades, Hendry39 min
May 19, 4:40 PM EDTSpecial Weather StatementMFLHendry50 min
May 19, 4:52 PM EDTSevere Thunderstorm WarningMFLCollier, Hendry18 min
May 19, 5:23 PM EDTSpecial Weather StatementMFLHendry52 min
May 19, 5:32 PM EDTSevere Thunderstorm WarningMFLCollier, Hendry43 min
May 19, 5:39 PM EDTSpecial Weather StatementMFLGlades51 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.