Alert archive / Florida / Special Weather Statements in 2021

Special Weather Statement, NWS Miami, FL

August 15, 2021Miami-Dade County, Florida

NWS Miami, FL issued this special weather statement at Aug 15, 2021, 4:02 PM EDT for Miami-Dade County, Florida. It was in force for 43 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
Aug 15, 2021, 4:02 PM EDT (20:02 UTC)
Expired
Aug 15, 2021, 4:45 PM EDT
In force
43 min
Issued by
NWS Miami, FL
Hail
0.00 in
Wind
40
Spout
Possible

County Miami-Dade County, FL

The radar

The Miami radar (KAMX), 51 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 77 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 2021-08-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 755 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 2021-08-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 49 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
755 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
977 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
49 m²/s²
0-3 km storm-relative helicity
67 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

177 
WWUS82 KMFL 152002
SPSMFL

Special Weather Statement
National Weather Service Miami FL
402 PM EDT Sun Aug 15 2021
 
FLZ174-152045-
Far South Miami-Dade County FL-
402 PM EDT Sun Aug 15 2021

...A strong thunderstorm will impact portions of southern Miami-Dade
County through 445 PM EDT...

At 400 PM EDT, National Weather Service meteorologists were tracking 
a strong thunderstorm capable of producing a waterspout over Florida 
Bay, 11 miles west of Key Largo, moving north at 10 mph.

HAZARD...Waterspouts and winds in excess of 40 mph.

SOURCE...Radar indicated.

IMPACT...Waterspouts can easily overturn boats and create locally 
         hazardous waters. Gusty winds could knock down tree limbs 
         and blow around unsecured objects.

Locations impacted include...
Mahogany Hammock.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Funnel clouds can touch down and produce waterspouts. Although
typically weak and short lived, a landfalling waterspout can cause
property damage and serious injury.

Persons participating in outdoor activities should seek sturdy
shelter until this storm passes. Open shelters found in parks,
beaches, or golf courses offer no protection from the dangers of
lightning.

&&

LAT...LON 2517 8067 2514 8070 2516 8074 2514 8074
      2534 8085 2538 8057 2521 8053 2521 8057
      2524 8055 2524 8057 2518 8061 2518 8062
      2519 8061 2520 8061 2518 8066 2518 8063
      2514 8065
TIME...MOT...LOC 2000Z 162DEG 10KT 2512 8061 

WATERSPOUT...POSSIBLE
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

$$

Hadi/RAG

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 14, 8:04 PM EDTSpecial Marine WarningMFL41 min
Aug 14, 8:06 PM EDTSpecial Weather StatementMFLCollier39 min
Aug 14, 8:18 PM EDTSpecial Weather StatementMFLMonroe42 min
Aug 14, 8:34 PM EDTAreal Flood AdvisoryMFLMiami-Dade3 hr
Aug 14, 8:54 PM EDTSpecial Weather StatementMFLMonroe51 min
Aug 14, 8:58 PM EDTAreal Flood AdvisoryMFLCollier3 hr
Aug 14, 9:02 PM EDTSpecial Weather StatementMFLMiami-Dade43 min
Aug 14, 9:03 PM EDTSpecial Marine WarningMFL42 min
Aug 14, 9:30 PM EDTSpecial Marine WarningMFL45 min
Aug 14, 9:39 PM EDTSpecial Weather StatementMFLBroward, Collier51 min
Aug 14, 9:42 PM EDTSpecial Marine WarningMFL63 min
Aug 14, 9:51 PM EDTSpecial Weather StatementMFLMiami-Dade39 min
Aug 14, 9:58 PM EDTSpecial Marine WarningMFL32 min
Aug 14, 10:07 PM EDTSpecial Marine WarningMFL38 min
Aug 14, 10:26 PM EDTSpecial Weather StatementMFLHendry, Palm Beach49 min
Aug 14, 11:22 PM EDTSpecial Weather StatementMFLGlades38 min
Aug 14, 11:38 PM EDTSpecial Marine WarningMFL52 min
Aug 15, 1:13 AM EDTSpecial Marine WarningMFL47 min
Aug 15, 1:16 AM EDTSpecial Marine WarningMFL44 min
Aug 15, 1:17 AM EDTSpecial Weather StatementMFLMiami-Dade28 min
Aug 15, 1:19 AM EDTSpecial Marine WarningMFL56 min
Aug 15, 1:21 AM EDTSpecial Weather StatementMFLMiami-Dade39 min
Aug 15, 1:49 AM EDTSpecial Weather StatementMFLMiami-Dade41 min
Aug 15, 3:06 AM EDTSpecial Weather StatementMFLCollier24 min
Aug 15, 4:29 AM EDTSpecial Marine WarningMFL46 min
Aug 15, 7:26 AM EDTSpecial Weather StatementMFLMiami-Dade34 min
Aug 15, 3:35 PM EDTSpecial Marine WarningMFL55 min
Aug 15, 4:25 PM EDTSpecial Marine WarningMFL65 min
Aug 15, 5:10 PM EDTSpecial Weather StatementMFLMiami-Dade50 min
Aug 15, 5:25 PM EDTSpecial Marine WarningMFL65 min
Aug 15, 6:34 PM EDTSpecial Marine WarningMFL56 min
Aug 15, 7:28 PM EDTSpecial Marine WarningMFL2 hr

Nearby

Special Weather Statements in Florida, 2021Every special weather statement in 2021

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.