Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 49, NWS Miami, FL

May 27, 2012Broward County, Palm Beach County, Florida

NWS Miami, FL issued this severe thunderstorm warning at May 27, 2012, 4:59 PM EDT for Broward County, Palm Beach County, Florida. It was in force for 61 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 27, 2012, 4:59 PM EDT (20:59 UTC)
Expired: May 27, 2012, 6:00 PM EDT
In force: 61 min
Issued by: NWS Miami, FL
Area: Storm-based polygon

Counties Broward County, FL, Palm Beach County, FL

The radar

The Miami radar (KAMX), 114 km from the middle of the area, began a volume at 21:00 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, 9.0 hours before the alert went out and 88 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: 563 J/kg
Mixed-layer CIN: -47 J/kg
Mixed-layer LCL: 988 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 15 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.

031 
WUUS52 KMFL 272059
SVRMFL
FLC011-099-272200-
/O.NEW.KMFL.SV.W.0049.120527T2059Z-120527T2200Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIAMI FL
459 PM EDT SUN MAY 27 2012

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

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

* UNTIL 600 PM EDT

* AT 451 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A 
LINE OF SEVERE THUNDERSTORM CAPABLE OF PRODUCING ONE INCH SIZE  
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THE LINE IS MOVING 
NORTHEAST AT 15 MPH. HAIL REPORTS OF ONE INCH WERE REPORTED EARLIER 
IN THE MIRAMAR AREA. 

* THE STORM WILL AFFECT...
  POMPANO BEACH...
  WHISPER WALK...
  DEERFIELD BEACH...
  HILLSBORO BEACH...
  BOCA RATON...
  ROYAL PALM BEACH...
  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.

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.

FREQUENT LIGHTNING IS OCCURRING WITH THIS THUNDERSTORM. IF
OUTDOORS...STAY AWAY FROM ISOLATED HIGH OBJECTS SUCH AS TREES AND
AVOID WATER. MOVE INDOORS OR INSIDE A VEHICLE IF POSSIBLE. AVOID
USING THE TELEPHONE UNLESS IT IS AN EMERGENCY. TRY TO UNPLUG
UNNECESSARY ELECTRICAL APPLIANCES BEFORE THE THUNDERSTORM APPROACHES.

&&

LAT...LON 2655 8004 2622 8008 2613 8030 2627 8033
      2696 8019 2698 8008 2693 8006 2680 8003
      2663 8003 2660 8004 2659 8003 2655 8003
TIME...MOT...LOC 2056Z 247DEG 11KT 2632 8018

$$

JE

The office that day

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

Issued	Product	Office	Counties	Lasted
May 26, 9:04 PM EDT	Special Weather Statement	MFL	Monroe	56 min
May 27, 4:36 AM EDT	Rip Current Statement	MFL	Palm Beach	25 hr
May 27, 3:05 PM EDT	Special Weather Statement	MFL	Broward	55 min
May 27, 3:29 PM EDT	Special Weather Statement	MFL	Palm Beach	61 min
May 27, 3:49 PM EDT	Special Weather Statement	MFL	Miami-Dade	56 min
May 27, 4:29 PM EDT	Special Weather Statement	MFL	Broward	61 min
May 27, 4:42 PM EDT	Special Marine Warning	MFL		63 min
May 27, 4:47 PM EDT	Special Weather Statement	MFL	Palm Beach	28 min
May 27, 4:49 PM EDT	Severe Thunderstorm Warning	MFL	Broward, Miami-Dade	41 min
May 27, 5:08 PM EDT	Special Marine Warning	MFL		82 min
May 27, 5:24 PM EDT	Severe Thunderstorm Warning	MFL	Broward, Miami-Dade	51 min
May 27, 5:47 PM EDT	Special Marine Warning	MFL		58 min
May 27, 6:00 PM EDT	Special Weather Statement	MFL	Glades	60 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.