Alert archive / Florida / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 13, NWS Miami, FL

April 20, 2021Miami-Dade County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Apr 20, 2021, 2:32 AM EDT for Miami-Dade County, Florida. It was in force for 58 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, 2021, 2:32 AM EDT (06:32 UTC)
Expired
Apr 20, 2021, 3:30 AM EDT
In force
58 min
Issued by
NWS Miami, FL
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Miami-Dade County, FL

The radar

The Miami radar (KAMX), 50 km from the middle of the area, began a volume at 06:35 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 00:00Z, 6.5 hours before the alert went out and 76 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 00:00Z on 2021-04-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1822 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 00:00Z on 2021-04-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 42 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
1822 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
975 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
42 m²/s²
0-3 km storm-relative helicity
116 m²/s²
Significant tornado parameter
0.6
Supercell composite
3.6

Open this sounding in Storm Lab

The text

As transmitted.

002 
WUUS52 KMFL 200632
SVRMFL
FLC086-200730-
/O.NEW.KMFL.SV.W.0013.210420T0632Z-210420T0730Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Miami FL
232 AM EDT Tue Apr 20 2021

The National Weather Service in Miami has issued a

* Severe Thunderstorm Warning for...
  Southern Miami-Dade County in southeastern Florida...

* Until 330 AM EDT.

* At 231 AM EDT, a severe thunderstorm was located 12 miles south of
  Royal Palm Ranger, or 16 miles northwest of Key Largo, moving
  northeast at 35 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Homestead, Turkey Point, Homestead General Airport, Homestead Miami
  Speedway and The Redland.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in Miami. You can also share your report with NWS Miami on
Facebook and Twitter.

&&

LAT...LON 2515 8077 2518 8080 2518 8085 2521 8079
      2522 8083 2563 8063 2542 8024 2524 8043
      2521 8054 2524 8057 2518 8061 2518 8062
      2519 8061 2519 8065 2514 8065 2514 8067
      2515 8066 2514 8078
TIME...MOT...LOC 0631Z 215DEG 31KT 2521 8067 

HAIL...1.00IN
WIND...60MPH
 
$$

Weinman
3 follow-up statements
685 
WWUS52 KMFL 200651
SVSMFL

Severe Weather Statement
National Weather Service Miami FL
251 AM EDT Tue Apr 20 2021

FLC086-200730-
/O.CON.KMFL.SV.W.0013.000000T0000Z-210420T0730Z/
Miami-Dade FL-
251 AM EDT Tue Apr 20 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 AM EDT
FOR SOUTHERN MIAMI-DADE COUNTY...

At 251 AM EDT, a severe thunderstorm was located near Florida City,
or near Homestead, moving northeast at 45 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Homestead, Turkey Point, Homestead General Airport, Homestead Miami
Speedway and The Redland.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Miami. You can also share your report with NWS Miami on Facebook and
Twitter.

&&

LAT...LON 2515 8077 2518 8080 2518 8085 2521 8079
      2522 8083 2563 8063 2542 8024 2524 8043
      2521 8054 2524 8057 2518 8061 2518 8062
      2519 8061 2519 8065 2514 8065 2514 8067
      2515 8066 2514 8078
TIME...MOT...LOC 0651Z 213DEG 40KT 2541 8052 

HAIL...1.00IN
WIND...60MPH
 
$$

Weinman
533 
WWUS52 KMFL 200657
SVSMFL

Severe Weather Statement
National Weather Service Miami FL
257 AM EDT Tue Apr 20 2021

FLC086-200730-
/O.CON.KMFL.SV.W.0013.000000T0000Z-210420T0730Z/
Miami-Dade FL-
257 AM EDT Tue Apr 20 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 AM EDT
FOR SOUTHERN MIAMI-DADE COUNTY...

At 256 AM EDT, a severe thunderstorm was located over Florida City,
or over Homestead, moving northeast at 35 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Homestead, Turkey Point, Homestead General Airport, Homestead Miami
Speedway and The Redland.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Miami. You can also share your report with NWS Miami on Facebook and
Twitter.

&&

LAT...LON 2526 8044 2525 8044 2543 8072 2563 8063
      2542 8024 2529 8038 2530 8039 2529 8039
      2529 8040 2528 8040 2527 8041 2527 8040
      2526 8043 2524 8043
TIME...MOT...LOC 0656Z 215DEG 31KT 2545 8049 

HAIL...1.00IN
WIND...60MPH
 
$$

Weinman
752 
WWUS52 KMFL 200720
SVSMFL

Severe Weather Statement
National Weather Service Miami FL
320 AM EDT Tue Apr 20 2021

FLC086-200730-
/O.EXP.KMFL.SV.W.0013.000000T0000Z-210420T0730Z/
Miami-Dade FL-
320 AM EDT Tue Apr 20 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN MIAMI-DADE COUNTY
WILL EXPIRE AT 330 AM EDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

LAT...LON 2526 8044 2525 8044 2543 8072 2563 8063
      2542 8024 2529 8038 2530 8039 2529 8039
      2529 8040 2528 8040 2527 8041 2527 8040
      2526 8043 2524 8043
TIME...MOT...LOC 0720Z 215DEG 31KT 2561 8037 

$$

Weinman

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 19, 9:25 PM EDTSpecial Weather StatementMFLMiami-Dade50 min
Apr 19, 9:38 PM EDTSpecial Marine WarningMFL97 min
Apr 19, 9:41 PM EDTSpecial Weather StatementMFLMiami-Dade34 min
Apr 19, 10:00 PM EDTSpecial Weather StatementMFLMiami-Dade45 min
Apr 19, 10:03 PM EDTSpecial Marine WarningMFL87 min
Apr 19, 10:11 PM EDTSpecial Weather StatementMFLMonroe64 min
Apr 19, 10:44 PM EDTSpecial Weather StatementMFLBroward46 min
Apr 19, 11:01 PM EDTSpecial Weather StatementMFLMiami-Dade44 min
Apr 19, 11:04 PM EDTSpecial Marine WarningMFL56 min
Apr 19, 11:25 PM EDTSpecial Marine WarningMFL65 min
Apr 19, 11:41 PM EDTSpecial Marine WarningMFL64 min
Apr 19, 11:50 PM EDTSpecial Weather StatementMFLMiami-Dade40 min
Apr 19, 11:56 PM EDTSpecial Marine WarningMFL94 min
Apr 20, 12:18 AM EDTSpecial Weather StatementMFLMiami-Dade42 min
Apr 20, 12:24 AM EDTAreal Flood AdvisoryMFLBroward, Miami-Dade4 hr
Apr 20, 12:26 AM EDTSpecial Marine WarningMFL45 min
Apr 20, 1:28 AM EDTSpecial Marine WarningMFL92 min
Apr 20, 1:32 AM EDTSpecial Weather StatementMFLMonroe58 min
Apr 20, 2:19 AM EDTAreal Flood AdvisoryMFLMiami-Dade3 hr
Apr 20, 2:25 AM EDTFlash Flood WarningMFLMiami-Dade3 hr
Apr 20, 2:34 AM EDTSpecial Weather StatementMFLMiami-Dade56 min
Apr 20, 2:36 AM EDTSpecial Weather StatementMFLCollier39 min
Apr 20, 2:37 AM EDTSpecial Marine WarningMFL83 min
Apr 20, 2:55 AM EDTSpecial Weather StatementMFLMiami-Dade50 min
Apr 20, 3:02 AM EDTSpecial Marine WarningMFL58 min
Apr 20, 3:03 AM EDTSpecial Weather StatementMFLBroward57 min
Apr 20, 5:42 AM EDTSpecial Weather StatementMFLPalm Beach48 min
Apr 20, 7:42 AM EDTSpecial Marine WarningMFL63 min
Apr 20, 8:34 AM EDTSpecial Marine WarningMFL26 min

Nearby

Severe Thunderstorm Warnings in Florida, 2021Every severe thunderstorm warning 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.