Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 5, NWS Miami, FL

April 20, 2012Broward County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Apr 20, 2012, 7:19 PM EDT for Broward County, Florida. It was in force for 19 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, 7:19 PM EDT (23:19 UTC)
Expired
Apr 20, 2012, 7:38 PM EDT
In force
19 min
Issued by
NWS Miami, FL
Area
Storm-based polygon

County Broward County, FL

The radar

The Miami radar (KAMX), 66 km from the middle of the area, began a volume at 23:19 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, 11.3 hours before the alert went out and 41 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.

881 
WUUS52 KMFL 202319
SVRMFL
FLC011-210000-
/O.NEW.KMFL.SV.W.0005.120420T2319Z-120421T0000Z/

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

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN BROWARD METRO IN SOUTH FLORIDA.

* UNTIL 800 PM EDT

* AT 715 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
  SAWGRASS MILLS MALL...AND MOVING EAST AT 10 MPH.

* THE STORM WILL AFFECT...
  SAWGRASS MILLS MALL...
  DAVIE...
  SUNRISE...
  COOPER CITY...
  PLANTATION...
  AND SURROUNDING COMMUNITIES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS IN EXCESS OF 58 MPH AND
OR LARGE DESTRUCTIVE 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.

SEVERE THUNDERSTORMS CAN PRODUCE VERY STRONG WINDS IN EXCESS OF 60
MPH...LARGE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAINFALL. STAY
INSIDE AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.

&&

LAT...LON 2626 8015 2604 8024 2611 8044 2627 8039
TIME...MOT...LOC 2319Z 282DEG 8KT 2614 8034

$$

GREGORIA
1 follow-up statement
633 
WWUS52 KMFL 202338
SVSMFL

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
738 PM EDT FRI APR 20 2012

FLC011-202348-
/O.CAN.KMFL.SV.W.0005.000000T0000Z-120421T0000Z/
BROWARD FL-
738 PM EDT FRI APR 20 2012

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN BROWARD METRO IS
CANCELLED...

NATIONAL WEATHER SERVICE RADAR INDICATED THAT THE THUNDERSTORM HAS
WEAKENED BELOW SEVERE LEVELS. THEREFORE...THE SEVERE THUNDERSTORM 
WARNING HAS BEEN CANCELLED.

THUNDERSTORMS REMAIN IN THE AREA ALONG THE SAWGRASS EXPRESSWAY. 
FREQUENT LIGHTNING...GUSTY WINDS TO 45 MPH...VERY HEAVY RAINFALL AND 
SMALL HAIL ARE STILL POSSIBLE. STAY TUNED TO NOAA WEATHER RADIO OR 
LOCAL MEDIA FOR THE LATEST UPDATES.

LAT...LON 2626 8015 2604 8024 2611 8044 2627 8039
TIME...MOT...LOC 2338Z 282DEG 8KT 2613 8029

$$

GREGORIA

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 20, 2:48 PM EDTSpecial Weather StatementMFLHendry27 min
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, 7:42 PM EDTSpecial Weather StatementMFLBroward33 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.