Alert archive / Florida / Tornado Warnings in 2011

Tornado Warning 3, NWS Miami, FL

October 18, 2011Palm Beach County, Florida

NWS Miami, FL issued this tornado warning at Oct 18, 2011, 8:29 AM EDT for Palm Beach County, Florida. It was in force for 16 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
Oct 18, 2011, 8:29 AM EDT (12:29 UTC)
Expired
Oct 18, 2011, 8:45 AM EDT
In force
16 min
Issued by
NWS Miami, FL
Area
Storm-based polygon

County Palm Beach County, FL

The radar

The Miami radar (KAMX), 119 km from the middle of the area, began a volume at 12:32 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, 0.5 hours before the alert went out and 94 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 2011-10-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2448 joules per kilogram.LCLEL10008507005003002001001 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 2011-10-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 68 square meters per square second.193958Sfc1 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
2448 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
448 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
68 m²/s²
0-3 km storm-relative helicity
112 m²/s²
Significant tornado parameter
1.0
Supercell composite
5.6

Open this sounding in Storm Lab

The text

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

492 
WFUS52 KMFL 181229
TORMFL
FLC099-181300-
/O.NEW.KMFL.TO.W.0003.111018T1229Z-111018T1300Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE MIAMI FL
829 AM EDT TUE OCT 18 2011

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

* TORNADO WARNING FOR...
  EAST CENTRAL PALM BEACH COUNTY IN SOUTHEAST FLORIDA...
  THIS INCLUDES THE CITIES OF...WEST PALM BEACH...LAKE WORTH...
  AND ATLANTIS...

* UNTIL 900 AM EDT

* AT 828 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR LAKE
  WORTH...MOVING NORTH AT 10 MPH.


* THE TORNADO WILL BE NEAR...
  ATLANTIS...
  LAKE WORTH...
  GREENACRES CITY...
  AND SURROUNDING COMMUNITIES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEEK SHELTER INSIDE A STURDY BUILDING ON THE LOWEST FLOOR...AWAY FROM
EXTERIOR WALLS AND WINDOWS. GET UNDER A WORKBENCH OR OTHER PIECE OF
STURDY FURNITURE. USE BLANKETS OR PILLOWS TO COVER YOUR BODY.

&&

LAT...LON 2654 8006 2652 8013 2673 8023 2677 8003
      2676 8003
TIME...MOT...LOC 1229Z 163DEG 10KT 2656 8009

$$

GREGORIA
2 follow-up statements
424 
WWUS52 KMFL 181236
SVSMFL

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
836 AM EDT TUE OCT 18 2011

FLC099-181300-
/O.CON.KMFL.TO.W.0003.000000T0000Z-111018T1300Z/
PALM BEACH FL-
836 AM EDT TUE OCT 18 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 900 AM EDT FOR EAST
CENTRAL PALM BEACH COUNTY...

AT 832 AM EDT...WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A
A POSSIBLE TORNADO APPROACHING INTERSTATE 95 AT ATLANTIS. THIS STORM 
WAS MOVING NORTH AT 10 MPH.

IF YOU ARE NEAR THE PATH OF A TORNADO...SEEK SHELTER IN A STURDY
BUILDING ON THE LOWEST FLOOR...AWAY FROM OUTSIDE WALLS AND WINDOWS.
GET UNDER A WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. USE
BLANKETS OR PILLOWS TO COVER YOUR BODY AND STAY AWAY FROM WINDOWS.

LAT...LON 2654 8006 2652 8013 2673 8023 2677 8003
      2676 8003
TIME...MOT...LOC 1235Z 163DEG 10KT 2658 8010

$$

GREGORIA
719 
WWUS52 KMFL 181245
SVSMFL

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
845 AM EDT TUE OCT 18 2011

FLC099-181254-
/O.CAN.KMFL.TO.W.0003.000000T0000Z-111018T1300Z/
PALM BEACH FL-
845 AM EDT TUE OCT 18 2011

...THE TORNADO WARNING FOR EAST CENTRAL PALM BEACH COUNTY IS
CANCELLED...

NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THAT THE ROTATION 
HAS WEAKENED NEAR ATLANTIS...SO A TORNADO IS NO LONGER APPARENT. 
THUS...THE TORNADO WARNING HAS BEEN CANCELLED.

LAT...LON 2654 8006 2652 8013 2673 8023 2677 8003
      2676 8003
TIME...MOT...LOC 1244Z 163DEG 10KT 2660 8011

$$

GREGORIA

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 18, 4:44 AM EDTGale WatchMFL11 hr
Oct 18, 5:20 AM EDTSpecial Weather StatementMFLBroward40 min
Oct 18, 8:19 AM EDTSpecial Weather StatementMFLPalm Beach26 min
Oct 18, 11:33 AM EDTSpecial Marine WarningMFL57 min
Oct 18, 12:29 PM EDTSpecial Marine WarningMFL2 hr
Oct 18, 2:24 PM EDTSpecial Marine WarningMFL2 hr
Oct 18, 2:49 PM EDTFlood WatchMFLBroward, Collier, Glades, Hendry, Miami-Dade, Monroe and 1 more7 hr
Oct 18, 3:35 PM EDTSpecial Marine WarningMFL115 min
Oct 18, 3:40 PM EDTGale WarningMFL21 hr
Oct 18, 3:50 PM EDTSmall Craft AdvisoryMFL36 hr
Oct 18, 5:13 PM EDTSpecial Weather StatementMFLLee32 min
Oct 18, 5:24 PM EDTSpecial Marine WarningMFL66 min
Oct 18, 5:48 PM EDTSpecial Weather StatementMFLCollier27 min
Oct 18, 6:10 PM EDTSpecial Marine WarningMFL95 min
Oct 18, 6:50 PM EDTSpecial Marine WarningMFL85 min
Oct 18, 7:06 PM EDTTornado WarningMFLGlades28 min
Oct 18, 7:40 PM EDTTornado WarningMFLGlades33 min

Nearby

Tornado Warnings in Florida, 2011Every tornado warning in 2011Tornadoes in 2011

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.