Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 148, NWS Miami, FL

September 6, 2012Palm Beach County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Sep 6, 2012, 4:01 PM EDT for Palm Beach County, Florida. It was in force for 25 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
Sep 6, 2012, 4:01 PM EDT (20:01 UTC)
Expired
Sep 6, 2012, 4:26 PM EDT
In force
25 min
Issued by
NWS Miami, FL
Area
Storm-based polygon

County Palm Beach County, FL

The radar

The Miami radar (KAMX), 103 km from the middle of the area, began a volume at 20:05 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, 8.0 hours before the alert went out and 81 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 2012-09-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2065 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Miami, FL at 12:00Z on 2012-09-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 1 square meters per square second.1939Sfc1 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
2065 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
806 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
1 m²/s²
0-3 km storm-relative helicity
9 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.

126 
WUUS52 KMFL 062001
SVRMFL
FLC099-062045-
/O.NEW.KMFL.SV.W.0148.120906T2001Z-120906T2045Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIAMI FL
401 PM EDT THU SEP 6 2012

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL PALM BEACH COUNTY IN SOUTH FLORIDA.

* UNTIL 445 PM EDT

* AT 356 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED 12 MILES SOUTHEAST OF BELLE
  GLADE...AND MOVING NORTHEAST AT 25 MPH.

* THE STORM WILL AFFECT...
  BELLE GLADE...
  LOXAHATCHEE NATIONAL WILDLIFE REFUGE...
  LION COUNTRY SAFARI...
  AND SURROUNDING COMMUNITIES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS CAN PRODUCE VERY STRONG WINDS IN EXCESS OF 58
MPH...DEADLY LIGHTNING...AND VERY HEAVY RAINFALL. STAY INSIDE AWAY
FROM WINDOWS UNTIL THE STORM HAS PASSED.

&&

LAT...LON 2648 8016 2633 8057 2635 8053 2669 8074
      2688 8040
TIME...MOT...LOC 2000Z 231DEG 20KT 2656 8055

$$

AK
2 follow-up statements
764 
WWUS52 KMFL 062021
SVSMFL

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
421 PM EDT THU SEP 6 2012

FLC099-062045-
/O.CON.KMFL.SV.W.0148.000000T0000Z-120906T2045Z/
PALM BEACH FL-
421 PM EDT THU SEP 6 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM EDT
FOR CENTRAL PALM BEACH COUNTY...

AT 417 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH. THIS STORM WAS LOCATED 9 MILES SOUTHWEST OF LION
COUNTRY SAFARI...MOVING NORTHEAST AT 20 MPH.

LAT...LON 2653 8019 2642 8044 2643 8049 2674 8065
      2688 8040
TIME...MOT...LOC 2021Z 231DEG 20KT 2663 8045

$$

AK
326 
WWUS52 KMFL 062026
SVSMFL

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
426 PM EDT THU SEP 6 2012

FLC099-062036-
/O.CAN.KMFL.SV.W.0148.000000T0000Z-120906T2045Z/
PALM BEACH FL-
426 PM EDT THU SEP 6 2012

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

THUNDERSTORMS REMAIN IN THE AREA. FREQUENT LIGHTNING...GUSTY WINDS TO
45 MPH AND VERY HEAVY RAINFALL ARE STILL POSSIBLE. STAY TUNED TO 
NOAA WEATHER RADIO OR LOCAL MEDIA FOR THE LATEST UPDATES.

LAT...LON 2653 8019 2642 8044 2643 8049 2674 8065
      2688 8040
TIME...MOT...LOC 2026Z 231DEG 20KT 2665 8043

$$

AK

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 6, 12:53 PM EDTSpecial Weather StatementMFLBroward52 min
Sep 6, 2:46 PM EDTAreal Flood AdvisoryMFLPalm Beach119 min
Sep 6, 2:58 PM EDTSpecial Marine WarningMFL92 min
Sep 6, 3:20 PM EDTSpecial Weather StatementMFLPalm Beach25 min
Sep 6, 3:32 PM EDTSevere Thunderstorm WarningMFLPalm Beach43 min
Sep 6, 3:40 PM EDTSpecial Weather StatementMFLBroward35 min
Sep 6, 4:10 PM EDTSpecial Weather StatementMFLBroward50 min
Sep 6, 4:36 PM EDTSevere Thunderstorm WarningMFLBroward, Palm Beach24 min
Sep 6, 4:52 PM EDTSevere Thunderstorm WarningMFLBroward, Palm Beach38 min
Sep 6, 5:33 PM EDTSpecial Marine WarningMFL36 min
Sep 6, 5:42 PM EDTAreal Flood AdvisoryMFLCollier2 hr
Sep 6, 5:47 PM EDTAreal Flood AdvisoryMFLGlades, Hendry118 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.