Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 29, NWS Miami, FL

May 18, 2012Broward County, Palm Beach County, Florida

NWS Miami, FL issued this severe thunderstorm warning at May 18, 2012, 1:49 PM EDT for Broward County, Palm Beach County, Florida. It was in force for 26 min. 2 reports 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, 1:49 PM EDT (17:49 UTC)
Expired: May 18, 2012, 2:15 PM EDT
In force: 26 min
Issued by: NWS Miami, FL
Area: Storm-based polygon

Counties Broward County, FL, Palm Beach County, FL

The radar

The Miami radar (KAMX), 103 km from the middle of the area, began a volume at 17:52 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, 2:14 PM EDT	HAIL 1	Lighthouse Point, FL	SPOTTER REPORTED QUARTER SIZED HAIL TO ALMOST HALF DOLLAR SIZE, WITH 35-45 MPH WIND GUSTS.
May 18, 2:14 PM EDT	HAIL 1.25	Lighthouse Point, FL	SPOTTER REPORTED QUARTER SIZED HAIL TO ALMOST HALF DOLLAR SIZE, WITH 35-45 MPH WIND GUSTS.

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, 5.8 hours before the alert went out and 77 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.

665 
WUUS52 KMFL 181749
SVRMFL
FLC011-099-181815-
/O.NEW.KMFL.SV.W.0029.120518T1749Z-120518T1815Z/

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

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN BROWARD COUNTY IN SOUTH FLORIDA.
  SOUTHEASTERN PALM BEACH COUNTY IN SOUTH FLORIDA.

* UNTIL 215 PM EDT

* AT 147 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
  BOCA RATON...AND MOVING EAST AT 15 MPH. AN ADDITIONAL STRENGTHENING
  STORM WAS OVER DELRAY BEACH WHICH COULD PRODUCE STRONG WINDS AND
  HAIL.

* THE STORM WILL AFFECT...
  BOCA RATON...
  DELRAY BEACH...
  OCEAN RIDGE...
  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 2655 8004 2640 8006 2637 8006 2627 8007
      2627 8016 2656 8020 2660 8005 2660 8004
      2659 8003 2655 8003
TIME...MOT...LOC 1749Z 264DEG 11KT 2635 8011

$$

GREGORIA

1 follow-up statement

310 
WWUS52 KMFL 181801
SVSMFL

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

FLC011-099-181815-
/O.CON.KMFL.SV.W.0029.000000T0000Z-120518T1815Z/
BROWARD FL-PALM BEACH FL-
201 PM EDT FRI MAY 18 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 215 PM EDT
FOR SOUTHEASTERN PALM BEACH AND NORTHEASTERN BROWARD COUNTIES...

AT 157 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING LARGE HAIL...AND
DAMAGING WINDS TO 60 MPH. THIS STORM WAS LOCATED OVER BOCA
RATON...MOVING EAST AT 15 MPH. AN ADDITIONAL STORM CAPABLE OF 
HIGH WINDS AND HAIL WAS LOCATED OVER VILLAGE OF GOLF.

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 2655 8004 2640 8006 2637 8006 2627 8007
      2627 8015 2657 8016 2660 8005 2660 8004
      2659 8003 2655 8003
TIME...MOT...LOC 1800Z 264DEG 11KT 2634 8008

$$

GREGORIA

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, 1:52 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, 2:28 PM EDT	Severe Thunderstorm Warning	MFL	Broward, Miami-Dade	26 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.