Alert archive / Florida / Special Weather Statements in 2013

Special Weather Statement, NWS Miami, FL

April 20, 2013Miami-Dade County, Florida

NWS Miami, FL issued this special weather statement at Apr 20, 2013, 12:37 PM EDT for Miami-Dade County, Florida. It was in force for 23 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
Apr 20, 2013, 12:37 PM EDT (16:37 UTC)
Expired
Apr 20, 2013, 1:00 PM EDT
In force
23 min
Issued by
NWS Miami, FL

County Miami-Dade County, FL

The radar

The Miami radar (KAMX), 18 km from the middle of the area, began a volume at 16:38 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, 4.6 hours before the alert went out and 40 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 2013-04-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1124 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 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 2013-04-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 25 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
1124 J/kg
Mixed-layer CIN
-17 J/kg
Mixed-layer LCL
825 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
25 m²/s²
0-3 km storm-relative helicity
21 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.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Miami, FL wrote its last area forecast discussion before this special weather statement went out at Apr 20, 9:47 AM EDT, 2 hours 50 minutes earlier.

Area forecast discussion, Apr 20, 9:47 AM EDT, 2 hours 50 minutes before
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Hazardous weather outlook, Apr 20, 4:18 AM EDT, 8 hours 19 minutes before
HAZARDOUS WEATHER OUTLOOK FOR SOUTH FLORIDA
NATIONAL WEATHER SERVICE MIAMI FL
418 AM EDT SAT APR 20 2013

AMZ610-630-650-651-670-671-FLZ063-066>075-168-172>174-GMZ656-657-676-
202330-
LAKE OKEECHOBEE-BISCAYNE BAY-
COASTAL WATERS FROM JUPITER INLET TO DEERFIELD BEACH, FL OUT 20 NM-
COASTAL WATERS FROM DEERFIELD BEACH TO OCEAN REEF, FL OUT 20 NM-
WATERS FROM JUPITER INLET TO DEERFIELD BEACH, FL EXTENDING FROM
20 NM TO 60 NM-
WATERS FROM DEERFIELD BEACH TO OCEAN REEF, FL EXTENDING FROM 20 NM
TO THE TERRITORIAL WATERS OF THE BAHAMAS-GLADES-HENDRY-
INLAND PALM BEACH-METRO PALM BEACH-COASTAL COLLIER-INLAND COLLIER-
INLAND BROWARD-METRO BROWARD-INLAND MIAMI DADE-METRO MIAMI DADE-
MAINLAND MONROE-COASTAL PALM BEACH-COASTAL BROWARD-
COASTAL MIAMI DADE-FAR SOUTH MIAMI DADE-
COASTAL WATERS FROM CHOKOLOSKEE TO BONITA BEACH, FL OUT 20 NM-
COASTAL WATERS FROM EAST CAPE SABLE TO CHOKOLOSKEE, FL OUT 20 NM-
GULF WATERS FROM CHOKOLOSKEE TO BONITA BEACH, FL EXTENDING FROM
20 TO 60 NM-
418 AM EDT SAT APR 20 2013

...SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS THIS AFTERNOON...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH FLORIDA.

.DAY ONE...TODAY AND TONIGHT

THUNDERSTORMS: SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS
ARE EXPECTED BY THIS AFTERNOON. THE BEST CHANCE WILL BE NORTH OF
TAMIAMI TRAIL WITH THE STRONGEST STORMS CAPABLE OF PRODUCING
FREQUENT LIGHTNING STRIKES ALONG WITH BRIEF HEAVY DOWNPOURS AND
GUSTY WINDS.

WIND: SOME OF THE STORMS MAY PRODUCE WIND GUSTS OF 40-50 MPH.

FLOODING: THE STORMS WILL CONTAIN BRIEF HEAVY DOWNPOURS AND THIS
COULD LEAD TO SOME MINOR URBAN STREET FLOODING MAINLY ACROSS THE
EAST COAST METROPOLITAN REGION.

RIP CURRENTS: A SOUTH TO SOUTHEAST WIND OF AROUND 10 MPH ALONG THE
ATLANTIC COAST AND A SOUTHWEST WIND OF 5 TO 10 MPH ALONG THE GULF
COAST WILL RESULT IN A SLIGHT RISK OF RIP CURRENTS AT THE BEACHES.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

STRONG THUNDERSTORMS WILL REMAIN POSSIBLE THROUGH SUNDAY AND
MONDAY AS A WEAKENING STATIONARY FRONT REMAINS OVER THE AREA. THE MAIN
IMPACTS WITH ANY STORM THAT DOES DEVELOP WILL BE LIGHTNING...HAIL
AND STRONG WIND GUSTS. ADDITIONALLY, ANY ACTIVITY THAT BECOMES
CONCENTRATED IN ONE AREA COULD LEAD TO LOCALIZED FLOODING.

.SPOTTER INFORMATION STATEMENT...

WIDESPREAD SPOTTER ACTIVATION IS NOT ANTICIPATED, HOWEVER
INDIVIDUAL SPOTTERS ARE ENCOURAGED TO REPORT HIGH WIND, HAIL AND
FLOODING TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN
MIAMI.

FOR MORE INFORMATION...VISIT THE NATIONAL WEATHER SERVICE IN
MIAMI WEBSITE AT WWW.WEATHER.GOV/MIAMI.

In the hours before

Special weather statement, Apr 20, 12:37 PM EDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Apr 20, 1:31 PM EDTSpecial Weather StatementMFLMiami-Dade44 min
Apr 20, 1:57 PM EDTSpecial Marine WarningMFL63 min
Apr 20, 2:40 PM EDTSpecial Weather StatementMFLMiami-Dade50 min
Apr 20, 2:56 PM EDTSpecial Marine WarningMFL64 min
Apr 20, 3:22 PM EDTSpecial Weather StatementMFLPalm Beach38 min
Apr 20, 4:16 PM EDTSpecial Weather StatementMFLBroward29 min
Apr 20, 4:36 PM EDTSpecial Weather StatementMFLGlades24 min
Apr 20, 4:42 PM EDTSpecial Marine WarningMFL63 min
Apr 20, 4:49 PM EDTSpecial Weather StatementMFLBroward41 min
Apr 20, 4:57 PM EDTTornado WarningMFLBroward18 min
Apr 20, 5:06 PM EDTSevere Thunderstorm WarningMFLBroward, Miami-Dade24 min
Apr 20, 5:20 PM EDTAreal Flood AdvisoryMFLBroward115 min
Apr 20, 5:23 PM EDTSpecial Marine WarningMFL67 min
Apr 20, 5:28 PM EDTSpecial Marine WarningMFL62 min
Apr 20, 5:28 PM EDTSpecial Weather StatementMFLBroward62 min
Apr 20, 6:23 PM EDTSpecial Marine WarningMFL67 min
Apr 20, 7:19 PM EDTAreal Flood AdvisoryMFLCollier116 min

Nearby

Special Weather Statements in Florida, 2013Every special weather statement in 2013

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.