Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 133, NWS Miami, FL

August 17, 2012Broward County, Palm Beach County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Aug 17, 2012, 5:31 PM EDT for Broward County, Palm Beach County, Florida. It was in force for 44 min. 3 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: Aug 17, 2012, 5:31 PM EDT (21:31 UTC)
Expired: Aug 17, 2012, 6:15 PM EDT
In force: 44 min
Issued by: NWS Miami, FL
Area: Storm-based polygon

Counties Broward County, FL, Palm Beach County, FL

The radar

The Miami radar (KAMX), 78 km from the middle of the area, began a volume at 21:31 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
Aug 17, 5:41 PM EDT	TSTM WND GST 52	Coral Springs, FL	A WIND GUST OF 52 MPH WAS RECORDED AT SAWGRASS MIDDLE SCHOOL. REPORT RELAYED BY LOCAL MEDIA.
Aug 17, 5:50 PM EDT	HAIL 0.25	Margate, FL	SKYWARN SPOTTER REPORTED PEA SIZED HAIL AT THE INTERSECTION OF ATLANTIC BLVD AND BANKS RD IN MARGATE.
Aug 17, 6:00 PM EDT	TSTM WND GST 60	Margate, FL	SKYWARN SPOTTER ESTIMATED WINDS OF AROUND 60 MPH NEAR THE INTERSECTION OF ATLANTIC BLVD AND BANKS RD IN MARGATE. SOME TREE LIMBS DOWNED WITH AT LEAST ONE HITTING A CAR.

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, 9.5 hours before the alert went out and 53 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: 2048 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 784 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -23 m²/s²
0-3 km storm-relative helicity: -30 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.

150 
WUUS52 KMFL 172131
SVRMFL
FLC011-099-172215-
/O.NEW.KMFL.SV.W.0133.120817T2131Z-120817T2215Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIAMI FL
531 PM EDT FRI AUG 17 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 615 PM EDT

* AT 526 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 4 MILES
  NORTHWEST OF CORAL SPRINGS...AND MOVING EAST AT 5 MPH.

* THE STORM WILL AFFECT...
  CORAL SPRINGS...
  PARKLAND...
  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.

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.

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.

REPORT SEVERE WEATHER OR DAMAGE TO THE NEAREST LAW ENFORCEMENT AGENCY
OR YOUR COUNTY EMERGENCY MANAGEMENT. THEY WILL RELAY YOUR REPORT TO
THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN MIAMI.

&&

LAT...LON 2619 8009 2625 8039 2639 8038 2643 8006
TIME...MOT...LOC 2131Z 272DEG 5KT 2630 8032

$$

BAXTER

3 follow-up statements

903 
WWUS52 KMFL 172151
SVSMFL

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
551 PM EDT FRI AUG 17 2012

FLC099-172201-
/O.CAN.KMFL.SV.W.0133.000000T0000Z-120817T2215Z/
PALM BEACH FL-
551 PM EDT FRI AUG 17 2012

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

LAT...LON 2619 8009 2625 8039 2633 8038 2633 8010
      2632 8008
TIME...MOT...LOC 2151Z 296DEG 8KT 2627 8028

$$

FLC011-172215-
/O.CON.KMFL.SV.W.0133.000000T0000Z-120817T2215Z/
BROWARD FL-
551 PM EDT FRI AUG 17 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR NORTHEASTERN BROWARD COUNTY...

AT 548 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED
NEAR CORAL SPRINGS...MOVING SOUTHEAST AT 10 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
CORAL SPRINGS...
MARGATE...
  AND SURROUNDING COMMUNITIES.

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.

REPORT SEVERE WEATHER OR DAMAGE TO THE NEAREST LAW ENFORCEMENT AGENCY
OR YOUR COUNTY EMERGENCY MANAGEMENT. THEY WILL RELAY YOUR REPORT TO
THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN MIAMI.

LAT...LON 2619 8009 2625 8039 2633 8038 2633 8010
      2632 8008
TIME...MOT...LOC 2151Z 296DEG 8KT 2627 8028

$$

BAXTER

221 
WWUS52 KMFL 172200
SVSMFL

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
600 PM EDT FRI AUG 17 2012

FLC011-172215-
/O.CON.KMFL.SV.W.0133.000000T0000Z-120817T2215Z/
BROWARD FL-
600 PM EDT FRI AUG 17 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR NORTHEASTERN BROWARD COUNTY...

AT 557 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED
NEAR MARGATE...MOVING SOUTHEAST AT 10 TO 15 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  MARGATE...
  COCONUT CREEK...
  AND SURROUNDING COMMUNITIES.

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.

REPORT SEVERE WEATHER OR DAMAGE TO THE NEAREST LAW ENFORCEMENT AGENCY
OR YOUR COUNTY EMERGENCY MANAGEMENT. THEY WILL RELAY YOUR REPORT TO
THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN MIAMI.

LAT...LON 2630 8012 2630 8008 2619 8009 2624 8032
      2633 8027
TIME...MOT...LOC 2200Z 299DEG 12KT 2624 8023

$$

BAXTER

794 
WWUS52 KMFL 172207
SVSMFL

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
607 PM EDT FRI AUG 17 2012

FLC011-172217-
/O.EXP.KMFL.SV.W.0133.000000T0000Z-120817T2215Z/
BROWARD FL-
607 PM EDT FRI AUG 17 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN BROWARD COUNTY
WILL EXPIRE AT 615 PM EDT...

NATIONAL WEATHER SERVICE RADAR INDICATED THAT THE THUNDERSTORMS HAVE
WEAKENED BELOW SEVERE LIMITS. THUS THE THUNDERSTORM WARNING WILL EXPIRE
AT 615 PM EDT.

THUNDERSTORMS REMAIN IN THE AREA WHICH CAN STILL PRODUCE FREQUENT
LIGHTNING...GUSTY WINDS TO 40 MPH...VERY HEAVY RAINFALL AND SMALL HAIL.
STAY TUNED TO NOAA WEATHER RADIO OR LOCAL MEDIA FOR THE LATEST UPDATES.

LAT...LON 2630 8012 2630 8008 2619 8009 2624 8032
      2633 8027
TIME...MOT...LOC 2207Z 299DEG 12KT 2623 8021

$$

BAXTER

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 17, 2:17 PM EDT	Special Marine Warning	MFL		58 min
Aug 17, 2:39 PM EDT	Special Weather Statement	MFL	Glades	36 min
Aug 17, 3:08 PM EDT	Special Marine Warning	MFL		50 min
Aug 17, 3:45 PM EDT	Special Weather Statement	MFL	Miami-Dade	45 min
Aug 17, 5:10 PM EDT	Special Weather Statement	MFL	Palm Beach	50 min
Aug 17, 5:13 PM EDT	Special Marine Warning	MFL		62 min
Aug 17, 5:15 PM EDT	Special Weather Statement	MFL	Broward	45 min
Aug 17, 5:24 PM EDT	Special Weather Statement	MFL	Broward	51 min
Aug 17, 5:44 PM EDT	Special Marine Warning	MFL		61 min
Aug 17, 6:00 PM EDT	Areal Flood Advisory	MFL	Broward, Palm Beach	60 min
Aug 17, 6:12 PM EDT	Special Weather Statement	MFL	Broward	33 min
Aug 17, 6:40 PM EDT	Special Marine Warning	MFL		23 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.