Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 31, NWS Miami, FL

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

NWS Miami, FL issued this severe thunderstorm warning at May 18, 2012, 2:07 PM EDT for Broward County, Palm Beach County, Florida. It was in force for 23 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, 2:07 PM EDT (18:07 UTC)
Expired
May 18, 2012, 2:30 PM EDT
In force
23 min
Issued by
NWS Miami, FL
Area
Storm-based polygon

Counties Broward County, FL, Palm Beach County, FL

The radar

The Miami radar (KAMX), 83 km from the middle of the area, began a volume at 18:11 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

TimeReportWhereRemark
May 18, 2:14 PM EDTHAIL 1Lighthouse Point, FLSPOTTER REPORTED QUARTER SIZED HAIL TO ALMOST HALF DOLLAR SIZE, WITH 35-45 MPH WIND GUSTS.
May 18, 2:14 PM EDTHAIL 1.25Lighthouse Point, FLSPOTTER 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, 6.1 hours before the alert went out and 57 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 2012-05-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1355 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 2012-05-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 16 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
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.

403 
WUUS52 KMFL 181807
SVRMFL
FLC011-099-181830-
/O.NEW.KMFL.SV.W.0031.120518T1807Z-120518T1830Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIAMI FL
207 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 230 PM EDT

* AT 206 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 OVER
  POMPANO BEACH...AND MOVING NORTHEAST AT 10 MPH.

* THE STORM WILL AFFECT...
  LIGHTHOUSE POINT...
  HILLSBORO BEACH...
  BOCA RATON...
  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 2633 8006 2633 8007 2626 8007 2624 8008
      2619 8009 2618 8014 2632 8018 2640 8006
      2637 8006
TIME...MOT...LOC 1807Z 241DEG 9KT 2627 8010

$$

GREGORIA
3 follow-up statements
447 
WWUS52 KMFL 181814 RRA
SVSMFL

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

FLC099-181824-
/O.CAN.KMFL.SV.W.0031.000000T0000Z-120518T1830Z/
PALM BEACH FL-
214 PM EDT FRI MAY 18 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN PALM BEACH COUNTY
IS CANCELLED...

LAT...LON 2626 8007 2624 8008 2619 8009 2618 8014
      2633 8015 2633 8010 2632 8009 2632 8007
TIME...MOT...LOC 1814Z 301DEG 6KT 2625 8011

$$

FLC011-181830-
/O.CON.KMFL.SV.W.0031.000000T0000Z-120518T1830Z/
BROWARD FL-
214 PM EDT FRI MAY 18 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 230 PM EDT
FOR NORTHEASTERN BROWARD COUNTY...

AT 211 PM EDT...A SEVERE THUNDERSTORM WAS LOCATED OVER HILLSBORO
AND POMPANO BEACH. LARGE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 
MPH ARE POSSIBLE. THIS STORM WAS LOCATED NEAR POMPANO BEACH 
AIRPORT...MOVING SOUTHEAST AT 5 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.

SEVERE THUNDERSTORMS CAN ALSO PRODUCE TORNADOES WITH LITTLE OR NO
ADVANCE WARNING. PREPARE TO MOVE TO A PLACE OF SAFETY IN AN INTERIOR
ROOM IN THE LOWEST FLOOR OF YOUR HOUSE OR BUSINESS IF A TORNADO IS
SPOTTED.

LAT...LON 2626 8007 2624 8008 2619 8009 2618 8014
      2633 8015 2633 8010 2632 8009 2632 8007
TIME...MOT...LOC 1814Z 301DEG 6KT 2625 8011

$$

GREGORIA
928 
WWUS52 KMFL 181821
SVSMFL

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

FLC011-181830-
/O.CON.KMFL.SV.W.0031.000000T0000Z-120518T1830Z/
BROWARD FL-
221 PM EDT FRI MAY 18 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 230 PM EDT
FOR EXTREME NORTHEASTERN BROWARD COUNTY...

AT 215 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A SEVERE THUNDERSTORM OVER LIGHTHOUSE POINT. A STORM
SPOTTER REPORTED QUARTER TO ALMOST HALF DOLLAR SIZE HAIL AT
LIGHTHOUSE POINT AND A 45 MPH WIND GUST WITH THIS STORM. THIS STORM 
WAS MOVING SOUTHEAST AT 5 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 2626 8007 2624 8008 2619 8009 2620 8013
      2630 8014 2632 8009 2632 8007
TIME...MOT...LOC 1821Z 301DEG 6KT 2624 8010

$$

GREGORIA
569 
WWUS52 KMFL 181826
SVSMFL

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

FLC011-181836-
/O.EXP.KMFL.SV.W.0031.000000T0000Z-120518T1830Z/
BROWARD FL-
226 PM EDT FRI MAY 18 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN BROWARD COUNTY
WILL EXPIRE AT 230 PM EDT...

NATIONAL WEATHER SERVICE RADAR INDICATED THAT THE SEVER THUNDERSTORM 
HAS MOVED OUT OF THE WARNED AREA. THUS THE THUNDERSTORM WARNING WILL
EXPIRE AT 230 PM EDT.

LAT...LON 2626 8007 2624 8008 2619 8009 2620 8013
      2630 8014 2632 8009 2632 8007
TIME...MOT...LOC 1826Z 301DEG 6KT 2624 8009

$$

GREGORIA

The office that day

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

IssuedProductOfficeCountiesLasted
May 17, 8:02 PM EDTSpecial Weather StatementMFLPalm Beach28 min
May 17, 8:52 PM EDTSpecial Weather StatementMFLPalm Beach38 min
May 17, 9:14 PM EDTSpecial Marine WarningMFL61 min
May 17, 9:20 PM EDTAreal Flood AdvisoryMFLPalm Beach76 min
May 17, 9:30 PM EDTSpecial Weather StatementMFLPalm Beach30 min
May 18, 1:16 PM EDTSpecial Weather StatementMFLBroward29 min
May 18, 1:26 PM EDTSpecial Weather StatementMFLMiami-Dade49 min
May 18, 1:29 PM EDTSpecial Marine WarningMFL61 min
May 18, 1:45 PM EDTSpecial Marine WarningMFL60 min
May 18, 1:46 PM EDTSpecial Weather StatementMFLPalm Beach29 min
May 18, 1:49 PM EDTSevere Thunderstorm WarningMFLBroward, Palm Beach26 min
May 18, 1:52 PM EDTSevere Thunderstorm WarningMFLMiami-Dade38 min
May 18, 2:08 PM EDTSevere Thunderstorm WarningMFLMiami-Dade37 min
May 18, 2:18 PM EDTSpecial Weather StatementMFLPalm Beach12 min
May 18, 2:25 PM EDTSpecial Marine WarningMFL95 min
May 18, 2:28 PM EDTSevere Thunderstorm WarningMFLBroward, Miami-Dade26 min
May 18, 2:36 PM EDTSpecial Marine WarningMFL54 min
May 18, 2:40 PM EDTSpecial Weather StatementMFLMiami-Dade35 min
May 18, 2:44 PM EDTSpecial Weather StatementMFLBroward46 min
May 18, 2:53 PM EDTSpecial Weather StatementMFLBroward37 min
May 18, 3:23 PM EDTAreal Flood AdvisoryMFLBroward112 min
May 18, 3:28 PM EDTSpecial Weather StatementMFLBroward32 min
May 18, 3:33 PM EDTSpecial Marine WarningMFL87 min
May 18, 3:39 PM EDTSpecial Weather StatementMFLBroward51 min
May 18, 3:43 PM EDTSpecial Weather StatementMFLPalm Beach47 min
May 18, 3:58 PM EDTSevere Thunderstorm WarningMFLBroward18 min
May 18, 4:05 PM EDTSpecial Weather StatementMFLHendry40 min
May 18, 4:14 PM EDTSpecial Marine WarningMFL91 min
May 18, 4:14 PM EDTSevere Thunderstorm WarningMFLHendry, Palm Beach46 min
May 18, 4:18 PM EDTSpecial Weather StatementMFLBroward42 min
May 18, 4:39 PM EDTSpecial Marine WarningMFL81 min
May 18, 5:02 PM EDTSpecial Weather StatementMFLMiami-Dade28 min
May 18, 5:09 PM EDTSpecial Marine WarningMFL81 min
May 18, 5:32 PM EDTSpecial Weather StatementMFLHendry28 min
May 18, 5:58 PM EDTSpecial Marine WarningMFL62 min
May 18, 6:17 PM EDTSpecial Marine WarningMFL58 min
May 18, 6:31 PM EDTSpecial Weather StatementMFLMiami-Dade29 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.