Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 149, NWS Miami, FL

September 6, 2012Broward County, Palm Beach County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Sep 6, 2012, 4:36 PM EDT for Broward County, Palm Beach County, Florida. It was in force for 24 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
Sep 6, 2012, 4:36 PM EDT (20:36 UTC)
Expired
Sep 6, 2012, 5:00 PM EDT
In force
24 min
Issued by
NWS Miami, FL
Area
Storm-based polygon

Counties Broward County, FL, Palm Beach County, FL

The radar

The Miami radar (KAMX), 70 km from the middle of the area, began a volume at 20:39 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
Sep 6, 4:42 PM EDTTSTM WND GST 60Sunrise, FLA THUNDERSTORM PRODUCED A WIND GUST OF 60 MPH IN SUNRISE.
Sep 6, 4:43 PM EDTTSTM WND GST 59Sunrise, FLA THUNDERSTORM PRODUCED A WIND GUST OF 59 MPH AT THE BROWARD COUNTY SCHOOL TECH AND SUPPORT.
Sep 6, 5:00 PM EDTTSTM WND GST 50Pompano Beach, FLA WEATHERBUG SITE RECORDED A WIND GUST OF 50 MPH AT MONARCH HIGH SCHOOL.

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, 8.6 hours before the alert went out and 45 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.

217 
WUUS52 KMFL 062036
SVRMFL
FLC011-099-062100-
/O.NEW.KMFL.SV.W.0149.120906T2036Z-120906T2100Z/

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

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

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

* UNTIL 500 PM EDT

* AT 435 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 NEAR
  SAWGRASS MILLS MALL...AND MOVING NORTHEAST AT 10 MPH.

* THE STORM WILL AFFECT...
  SAWGRASS MILLS MALL...
  SUNRISE...
  LAUDERHILL...
  TAMARAC...
  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.

&&

LAT...LON 2636 8031 2625 8010 2604 8026 2612 8044
TIME...MOT...LOC 2037Z 211DEG 8KT 2615 8030

$$

AK
1 follow-up statement
125 
WWUS52 KMFL 062046
SVSMFL

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

FLC011-099-062100-
/O.CON.KMFL.SV.W.0149.000000T0000Z-120906T2100Z/
BROWARD FL-PALM BEACH FL-
446 PM EDT THU SEP 6 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM EDT
FOR EXTREME SOUTH CENTRAL PALM BEACH AND NORTHEASTERN BROWARD
COUNTIES...

AT 443 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING LARGE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR
TAMARAC...MOVING NORTH AT 10 MPH.

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. OR YOU CAN
ALSO CALL THE NATIONAL WEATHER SERVICE IN MIAMI DIRECTLY AT
305.229.4528 TO REPORT SEVERE WEATHER.

LAT...LON 2616 8042 2636 8031 2625 8010 2608 8023
TIME...MOT...LOC 2046Z 200DEG 10KT 2620 8028

$$

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, 4:01 PM EDTSevere Thunderstorm WarningMFLPalm Beach25 min
Sep 6, 4:10 PM EDTSpecial Weather StatementMFLBroward50 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.