Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 43, NWS Miami, FL

May 20, 2012Broward County, Palm Beach County, Florida

NWS Miami, FL issued this severe thunderstorm warning at May 20, 2012, 5:33 PM EDT for Broward County, Palm Beach County, Florida. It was in force for 42 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 20, 2012, 5:33 PM EDT (21:33 UTC)
Expired
May 20, 2012, 6:15 PM EDT
In force
42 min
Issued by
NWS Miami, FL
Area
Storm-based polygon

Counties Broward County, FL, Palm Beach County, FL

The radar

The Miami radar (KAMX), 79 km from the middle of the area, began a volume at 21:36 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, 9.6 hours before the alert went out and 67 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 2012-05-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 982 joules per kilogram.LCLLFCEL10008507005003002001001 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 2012-05-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 15 square meters per square second.19395878Sfc1 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
982 J/kg
Mixed-layer CIN
-9 J/kg
Mixed-layer LCL
629 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
15 m²/s²
0-3 km storm-relative helicity
69 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

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

977 
WUUS52 KMFL 202133
SVRMFL
FLC011-099-202215-
/O.NEW.KMFL.SV.W.0043.120520T2133Z-120520T2215Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIAMI FL
533 PM EDT SUN MAY 20 2012

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN BROWARD COUNTY IN SOUTH FLORIDA.
  SOUTHWESTERN PALM BEACH COUNTY IN SOUTH FLORIDA.

* UNTIL 615 PM EDT

* AT 532 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 6 MILES
  NORTHEAST OF MICCOSUKEE SERVICE PLAZA...AND MOVING NORTHEAST AT 15
  MPH.

* THE STORM WILL AFFECT...
  HOLEY LAND WILDLIFE MANAGEMENT AREA...
  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 2612 8084 2620 8089 2630 8088 2655 8062
      2627 8038
TIME...MOT...LOC 2133Z 236DEG 14KT 2624 8078

$$

AK
2 follow-up statements
835 
WWUS52 KMFL 202147
SVSMFL

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
547 PM EDT SUN MAY 20 2012

FLC011-099-202215-
/O.CON.KMFL.SV.W.0043.000000T0000Z-120520T2215Z/
BROWARD FL-PALM BEACH FL-
547 PM EDT SUN MAY 20 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR SOUTHWESTERN PALM BEACH AND NORTHWESTERN BROWARD COUNTIES...

AT 545 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 8 MILES NORTHEAST OF
MICCOSUKEE SERVICE PLAZA...MOVING NORTHEAST AT 15 MPH.

LAT...LON 2615 8086 2618 8088 2620 8088 2630 8088
      2655 8062 2634 8044
TIME...MOT...LOC 2147Z 222DEG 12KT 2628 8078

$$

AK
834 
WWUS52 KMFL 202205
SVSMFL

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
605 PM EDT SUN MAY 20 2012

FLC011-099-202215-
/O.EXP.KMFL.SV.W.0043.000000T0000Z-120520T2215Z/
BROWARD FL-PALM BEACH FL-
605 PM EDT SUN MAY 20 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN PALM BEACH AND
NORTHWESTERN BROWARD COUNTIES WILL EXPIRE AT 615 PM EDT...

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

LAT...LON 2615 8086 2618 8088 2620 8088 2630 8088
      2655 8062 2634 8044
TIME...MOT...LOC 2205Z 222DEG 12KT 2632 8074

$$

AK

The office that day

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

IssuedProductOfficeCountiesLasted
May 20, 5:18 PM EDTSpecial Weather StatementMFLBroward42 min
May 20, 5:21 PM EDTSpecial Weather StatementMFLPalm Beach39 min
May 20, 5:38 PM EDTSevere Thunderstorm WarningMFLPalm Beach37 min
May 20, 5:56 PM EDTSpecial Weather StatementMFLBroward49 min
May 20, 6:03 PM EDTAreal Flood AdvisoryMFLBroward64 min
May 20, 6:30 PM EDTSpecial Weather StatementMFLMiami-Dade30 min
May 20, 6:49 PM EDTSpecial Marine WarningMFL86 min
May 20, 6:58 PM EDTSpecial Weather StatementMFLMiami-Dade62 min
May 20, 7:33 PM EDTSpecial Weather StatementMFLMiami-Dade57 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.