Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 33, NWS Miami, FL

May 18, 2012Broward County, Miami-Dade County, Florida

NWS Miami, FL issued this severe thunderstorm warning at May 18, 2012, 2:28 PM EDT for Broward County, Miami-Dade County, Florida. It was in force for 26 min. 1 report 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: May 18, 2012, 2:28 PM EDT (18:28 UTC)
Expired: May 18, 2012, 2:54 PM EDT
In force: 26 min
Issued by: NWS Miami, FL
Area: Storm-based polygon

Counties Broward County, FL, Miami-Dade County, FL

The radar

The Miami radar (KAMX), 42 km from the middle of the area, began a volume at 18:30 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

Time	Report	Where	Remark
May 18, 2:33 PM EDT	TSTM WND GST 45	Medley, FL	A THUNDERSTORM PRODUCED A WIND GUST ESTIMATED BETWEEN 40 AND 50 MPH IN MEDLEY.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Miami, FL (KMFL), launched 12:00Z, 6.5 hours before the alert went out and 16 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1355 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 572 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 71 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

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

831 
WUUS52 KMFL 181828
SVRMFL
FLC011-086-181915-
/O.NEW.KMFL.SV.W.0033.120518T1828Z-120518T1915Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIAMI FL
228 PM EDT FRI MAY 18 2012

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN BROWARD COUNTY IN SOUTH FLORIDA.
  NORTHEASTERN MIAMI-DADE COUNTY IN SOUTH FLORIDA.

* UNTIL 315 PM EDT

* AT 225 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
  HIALEAH GARDENS...AND MOVING NORTHEAST AT 20 MPH.

* THE STORM WILL AFFECT...
  HIALEAH GARDENS...
  MIAMI LAKES...
  OPA-LOCKA...
  CAROL CITY...
  SUN LIFE STADIUM...
  NORTH MIAMI...
  AND SURROUNDING COMMUNITIES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 2589 8011 2587 8011 2585 8015 2588 8015
      2585 8016 2579 8035 2595 8042 2609 8014
      2603 8011 2591 8011 2591 8010 2590 8010
TIME...MOT...LOC 1828Z 242DEG 17KT 2588 8032

$$

MJB

2 follow-up statements

338 
WWUS52 KMFL 181848
SVSMFL

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
248 PM EDT FRI MAY 18 2012

FLC011-086-181915-
/O.CON.KMFL.SV.W.0033.000000T0000Z-120518T1915Z/
BROWARD FL-MIAMI-DADE FL-
248 PM EDT FRI MAY 18 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM EDT
FOR NORTHEASTERN MIAMI-DADE AND SOUTHEASTERN BROWARD COUNTIES...

AT 244 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING HAIL...AND 
DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR SAINT
THOMAS UNIVERSITY...MOVING NORTHEAST AT 20 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 2589 8011 2587 8011 2585 8015 2588 8015
      2585 8016 2583 8025 2599 8035 2609 8014
      2603 8011 2591 8011 2591 8010 2590 8010
TIME...MOT...LOC 1848Z 242DEG 17KT 2592 8023

$$

MJB

987 
WWUS52 KMFL 181854
SVSMFL

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
254 PM EDT FRI MAY 18 2012

FLC011-086-181902-
/O.CAN.KMFL.SV.W.0033.000000T0000Z-120518T1915Z/
BROWARD FL-MIAMI-DADE FL-
254 PM EDT FRI MAY 18 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN MIAMI-DADE AND
SOUTHEASTERN BROWARD COUNTIES IS CANCELLED...

THE THUNDERSTORM THAT PROMPTED THE WARNING HAS WEAKENED CONSIDERABLY 
AND IS NO LONGER SEVERE. HOWEVER, GUSTY WINDS TO AROUND 40 MPH AND 
HEAVY DOWNPOURS ARE STILL POSSIBLE.

LAT...LON 2589 8011 2587 8011 2585 8015 2588 8015
      2585 8016 2583 8025 2599 8035 2609 8014
      2603 8011 2591 8011 2591 8010 2590 8010
TIME...MOT...LOC 1852Z 242DEG 17KT 2593 8021

$$

MJB

The office that day

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

Issued	Product	Office	Counties	Lasted
May 17, 8:02 PM EDT	Special Weather Statement	MFL	Palm Beach	28 min
May 17, 8:52 PM EDT	Special Weather Statement	MFL	Palm Beach	38 min
May 17, 9:14 PM EDT	Special Marine Warning	MFL		61 min
May 17, 9:20 PM EDT	Areal Flood Advisory	MFL	Palm Beach	76 min
May 17, 9:30 PM EDT	Special Weather Statement	MFL	Palm Beach	30 min
May 18, 1:16 PM EDT	Special Weather Statement	MFL	Broward	29 min
May 18, 1:26 PM EDT	Special Weather Statement	MFL	Miami-Dade	49 min
May 18, 1:29 PM EDT	Special Marine Warning	MFL		61 min
May 18, 1:45 PM EDT	Special Marine Warning	MFL		60 min
May 18, 1:46 PM EDT	Special Weather Statement	MFL	Palm Beach	29 min
May 18, 1:49 PM EDT	Severe Thunderstorm Warning	MFL	Broward, Palm Beach	26 min
May 18, 1:52 PM EDT	Severe Thunderstorm Warning	MFL	Miami-Dade	38 min
May 18, 2:07 PM EDT	Severe Thunderstorm Warning	MFL	Broward, Palm Beach	23 min
May 18, 2:08 PM EDT	Severe Thunderstorm Warning	MFL	Miami-Dade	37 min
May 18, 2:18 PM EDT	Special Weather Statement	MFL	Palm Beach	12 min
May 18, 2:25 PM EDT	Special Marine Warning	MFL		95 min
May 18, 2:36 PM EDT	Special Marine Warning	MFL		54 min
May 18, 2:40 PM EDT	Special Weather Statement	MFL	Miami-Dade	35 min
May 18, 2:44 PM EDT	Special Weather Statement	MFL	Broward	46 min
May 18, 2:53 PM EDT	Special Weather Statement	MFL	Broward	37 min
May 18, 3:23 PM EDT	Areal Flood Advisory	MFL	Broward	112 min
May 18, 3:28 PM EDT	Special Weather Statement	MFL	Broward	32 min
May 18, 3:33 PM EDT	Special Marine Warning	MFL		87 min
May 18, 3:39 PM EDT	Special Weather Statement	MFL	Broward	51 min
May 18, 3:43 PM EDT	Special Weather Statement	MFL	Palm Beach	47 min
May 18, 3:58 PM EDT	Severe Thunderstorm Warning	MFL	Broward	18 min
May 18, 4:05 PM EDT	Special Weather Statement	MFL	Hendry	40 min
May 18, 4:14 PM EDT	Special Marine Warning	MFL		91 min
May 18, 4:14 PM EDT	Severe Thunderstorm Warning	MFL	Hendry, Palm Beach	46 min
May 18, 4:18 PM EDT	Special Weather Statement	MFL	Broward	42 min
May 18, 4:39 PM EDT	Special Marine Warning	MFL		81 min
May 18, 5:02 PM EDT	Special Weather Statement	MFL	Miami-Dade	28 min
May 18, 5:09 PM EDT	Special Marine Warning	MFL		81 min
May 18, 5:32 PM EDT	Special Weather Statement	MFL	Hendry	28 min
May 18, 5:58 PM EDT	Special Marine Warning	MFL		62 min
May 18, 6:17 PM EDT	Special Marine Warning	MFL		58 min
May 18, 6:31 PM EDT	Special Weather Statement	MFL	Miami-Dade	29 min

Nearby

Severe Thunderstorm Warnings in Florida, 2012 Every 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.