Alert archive / Florida / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 18, NWS Miami, FL

May 6, 2021Miami-Dade County, Florida

NWS Miami, FL issued this severe thunderstorm warning at May 6, 2021, 7:52 PM EDT for Miami-Dade County, Florida. It was in force for 21 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 6, 2021, 7:52 PM EDT (23:52 UTC)
Expired: May 6, 2021, 8:13 PM EDT
In force: 21 min
Issued by: NWS Miami, FL
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

County Miami-Dade County, FL

The radar

The Miami radar (KAMX), 26 km from the middle of the area, began a volume at 23:55 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, 11.9 hours before the alert went out and 19 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 717 J/kg
Mixed-layer CIN: -52 J/kg
Mixed-layer LCL: 885 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 4 m²/s²
0-3 km storm-relative helicity: -15 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

195 
WUUS52 KMFL 062352
SVRMFL
FLC086-070045-
/O.NEW.KMFL.SV.W.0018.210506T2352Z-210507T0045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Miami FL
752 PM EDT Thu May 6 2021

The National Weather Service in Miami has issued a

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

* Until 845 PM EDT.

* At 751 PM EDT, a severe thunderstorm was located over Key Biscayne,
  moving southeast at 15 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...
  Miami and Key Biscayne. 

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 2566 8020 2575 8018 2574 8012 2565 8014
TIME...MOT...LOC 2351Z 297DEG 13KT 2570 8017 

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

Weinman

1 follow-up statement

297 
WWUS52 KMFL 070013
SVSMFL

Severe Weather Statement
National Weather Service Miami FL
813 PM EDT Thu May 6 2021

FLC086-070023-
/O.CAN.KMFL.SV.W.0018.000000T0000Z-210507T0045Z/
Miami-Dade FL-
813 PM EDT Thu May 6 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL MIAMI-DADE COUNTY IS
CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Miami.

LAT...LON 2566 8020 2575 8018 2574 8012 2565 8014
TIME...MOT...LOC 0012Z 297DEG 13KT 2566 8009 

$$

Weinman

The office that day

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

Issued	Product	Office	Counties	Lasted
May 5, 8:19 PM EDT	Special Marine Warning	MFL		56 min
May 5, 8:39 PM EDT	Special Weather Statement	MFL	Palm Beach	51 min
May 6, 12:35 PM EDT	Special Marine Warning	MFL		55 min
May 6, 1:22 PM EDT	Special Marine Warning	MFL		37 min
May 6, 2:34 PM EDT	Special Weather Statement	MFL	Palm Beach	41 min
May 6, 3:53 PM EDT	Special Marine Warning	MFL		97 min
May 6, 5:02 PM EDT	Special Weather Statement	MFL	Palm Beach	43 min
May 6, 5:23 PM EDT	Special Marine Warning	MFL		37 min
May 6, 5:24 PM EDT	Special Weather Statement	MFL	Palm Beach	81 min
May 6, 5:34 PM EDT	Severe Thunderstorm Warning	MFL	Palm Beach	26 min
May 6, 5:48 PM EDT	Special Weather Statement	MFL	Palm Beach	42 min
May 6, 5:51 PM EDT	Special Marine Warning	MFL		114 min
May 6, 5:53 PM EDT	Severe Thunderstorm Warning	MFL	Palm Beach	52 min
May 6, 5:56 PM EDT	Special Marine Warning	MFL		64 min
May 6, 6:01 PM EDT	Special Weather Statement	MFL	Palm Beach	59 min
May 6, 6:08 PM EDT	Special Weather Statement	MFL	Broward	52 min
May 6, 6:08 PM EDT	Severe Thunderstorm Warning	MFL	Palm Beach	67 min
May 6, 6:32 PM EDT	Severe Thunderstorm Warning	MFL	Palm Beach	58 min
May 6, 6:41 PM EDT	Special Marine Warning	MFL		94 min
May 6, 7:06 PM EDT	Special Marine Warning	MFL		84 min
May 6, 7:10 PM EDT	Special Weather Statement	MFL	Miami-Dade	50 min
May 6, 7:10 PM EDT	Special Weather Statement	MFL	Martin	50 min
May 6, 7:28 PM EDT	Special Weather Statement	MFL	Palm Beach	77 min
May 6, 7:34 PM EDT	Areal Flood Advisory	MFL	Miami-Dade	116 min
May 6, 7:41 PM EDT	Special Marine Warning	MFL		2 hr
May 6, 7:43 PM EDT	Areal Flood Advisory	MFL	Palm Beach	3 hr

Nearby

Severe Thunderstorm Warnings in Florida, 2021 Every 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.