Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 12, NWS Miami, FL

May 9, 2012Miami-Dade County, Florida

NWS Miami, FL issued this severe thunderstorm warning at May 9, 2012, 4:05 PM EDT for Miami-Dade County, Florida. It was in force for 40 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
May 9, 2012, 4:05 PM EDT (20:05 UTC)
Expired
May 9, 2012, 4:45 PM EDT
In force
40 min
Issued by
NWS Miami, FL
Area
Storm-based polygon

County Miami-Dade County, FL

The radar

The Miami radar (KAMX), 33 km from the middle of the area, began a volume at 20:07 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
May 9, 4:10 PM EDTHAIL 0.25Miami Beach, FLNWS EMPLOYEE REPORTED PEA SIZED HAIL NEAR BRICKELL.
May 9, 4:10 PM EDTHAIL 0.88Miami Beach, FLMEDIA REPORTED NICKEL SIZED HAIL NEAR BRICKELL AVENUE.
May 9, 4:10 PM EDTHAIL 1Miami Beach, FLMEDIA REPORTED ONE INCH HAIL NEAR MIAMI BEACH.

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, 8.1 hours before the alert went out and 15 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 2012-05-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 613 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 2012-05-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 15 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
613 J/kg
Mixed-layer CIN
-20 J/kg
Mixed-layer LCL
890 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
15 m²/s²
0-3 km storm-relative helicity
74 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.

611 
WUUS52 KMFL 092005
SVRMFL
FLC086-092045-
/O.NEW.KMFL.SV.W.0012.120509T2005Z-120509T2045Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIAMI FL
405 PM EDT WED MAY 9 2012

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME NORTHEASTERN MIAMI-DADE COUNTY IN SOUTH FLORIDA.

* UNTIL 445 PM EDT

* AT 403 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED NEAR MIAMI BEACH...AND MOVING
  EAST AT 15 MPH.

* THE STORM WILL AFFECT...
  MIAMI BEACH...
  AND SURROUNDING COMMUNITIES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2576 8013 2573 8014 2567 8015 2566 8016
      2568 8018 2573 8017 2574 8018 2577 8015
      2580 8015 2584 8014 2585 8016 2588 8015
      2588 8016 2590 8012 2585 8011
TIME...MOT...LOC 2005Z 263DEG 12KT 2581 8012

$$

60
2 follow-up statements
262 
WWUS52 KMFL 092019
SVSMFL

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
419 PM EDT WED MAY 9 2012

FLC086-092045-
/O.CON.KMFL.SV.W.0012.000000T0000Z-120509T2045Z/
MIAMI-DADE FL-
419 PM EDT WED MAY 9 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM EDT
FOR EXTREME NORTHEASTERN MIAMI-DADE COUNTY...

AT 416 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM PRODUCING THIS STORM WAS LOCATED NEAR
MIAMI BEACH...MOVING EAST AT 15 MPH.

REPORTS HAVE BEEN RECEIVED OF HAIL UP TO THREE QUARTERS OF AN INCH.

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

LAT...LON 2576 8013 2573 8014 2567 8015 2566 8016
      2568 8018 2573 8017 2574 8018 2577 8015
      2580 8015 2584 8014 2585 8016 2588 8015
      2588 8016 2590 8012 2585 8011
TIME...MOT...LOC 2019Z 263DEG 12KT 2582 8007

$$

60
860 
WWUS52 KMFL 092044
SVSMFL

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
444 PM EDT WED MAY 9 2012

FLC086-092052-
/O.EXP.KMFL.SV.W.0012.000000T0000Z-120509T2045Z/
MIAMI-DADE FL-
444 PM EDT WED MAY 9 2012

...THE SEVERE THUNDERSTORM WARNING FOR EXTREME NORTHEASTERN
MIAMI-DADE COUNTY WILL EXPIRE AT 445 PM EDT...

THE SEVERE THUNDERSTORM HAS LESSENED IN INTENSITY AND HAS BEEN 
ALLOWED TO EXPIRE. BUT RESIDENTS NEED TO CONTINUE TO EXERCISE 
CAUTION.

THUNDERSTORMS REMAIN IN THE AREA. FREQUENT LIGHTNING...GUSTY WINDS TO
40 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 2576 8013 2573 8014 2567 8015 2566 8016
      2568 8018 2573 8017 2574 8018 2577 8015
      2580 8015 2584 8014 2585 8016 2588 8015
      2588 8016 2590 8012 2585 8011
TIME...MOT...LOC 2042Z 263DEG 12KT 2583 7999

$$

60

The office that day

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

IssuedProductOfficeCountiesLasted
May 9, 2:03 PM EDTSpecial Weather StatementMFLPalm Beach42 min
May 9, 2:13 PM EDTSpecial Marine WarningMFL21 min
May 9, 2:54 PM EDTSpecial Marine WarningMFL51 min
May 9, 2:56 PM EDTSpecial Marine WarningMFL64 min
May 9, 3:07 PM EDTSpecial Weather StatementMFLPalm Beach38 min
May 9, 3:19 PM EDTSpecial Weather StatementMFLBroward41 min
May 9, 3:33 PM EDTSpecial Marine WarningMFL57 min
May 9, 3:45 PM EDTSpecial Weather StatementMFLMartin45 min
May 9, 3:49 PM EDTSpecial Weather StatementMFLMiami-Dade41 min
May 9, 3:54 PM EDTSpecial Weather StatementMFLMartin36 min
May 9, 3:57 PM EDTSpecial Marine WarningMFL63 min
May 9, 4:35 PM EDTAreal Flood AdvisoryMFLMiami-Dade115 min
May 9, 4:40 PM EDTSpecial Marine WarningMFL65 min
May 9, 5:03 PM EDTSpecial Weather StatementMFLMiami-Dade42 min
May 9, 5:11 PM EDTSevere Thunderstorm WarningMFLMiami-Dade54 min
May 9, 5:43 PM EDTSpecial Marine WarningMFL62 min
May 9, 6:29 PM EDTAreal Flood AdvisoryMFLMiami-Dade2 hr

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.