Alert archive / Florida / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 10, NWS Miami, FL

April 11, 2021Broward County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Apr 11, 2021, 4:18 PM EDT for Broward County, Florida. It was in force for 40 min. 2 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: Apr 11, 2021, 4:18 PM EDT (20:18 UTC)
Expired: Apr 11, 2021, 4:58 PM EDT
In force: 40 min
Issued by: NWS Miami, FL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Broward County, FL

The radar

The Miami radar (KAMX), 57 km from the middle of the area, began a volume at 20:17 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

Time	Report	Where	Remark
Apr 11, 4:24 PM EDT	MARINE TSTM WIND 39	1 E Dania Beach, FL	DELAYED REPORT. A MARINE THUNDERSTORM WIND GUST OF 39 MPH / 34 KNOTS WAS RECORDED BY MESONET STATION XPES PORT EVERGLADES SOUTH.
Apr 11, 4:34 PM EDT	MARINE TSTM WIND 48	3 Se Fort Lauderdale, FL	DELAYED REPORT. A MARINE THUNDERSTORM WIND GUST OF 48 MPH / 42 KNOTS WAS RECORDED BY MESONET STATION AU497 FORT LAUDERDALE.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 11, 2:03 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Miami, FL (KMFL), launched 12:00Z, 8.3 hours before the alert went out and 31 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: 1240 J/kg
Mixed-layer CIN: -44 J/kg
Mixed-layer LCL: 856 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 100 m²/s²
0-3 km storm-relative helicity: 132 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.8

Open this sounding in Storm Lab

The text

As transmitted.

082 
WUUS52 KMFL 112018
SVRMFL
FLC011-112115-
/O.NEW.KMFL.SV.W.0010.210411T2018Z-210411T2115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Miami FL
418 PM EDT Sun Apr 11 2021

The National Weather Service in Miami has issued a

* Severe Thunderstorm Warning for...
  Southern Broward County in southeastern Florida...

* Until 515 PM EDT.

* At 418 PM EDT, a severe thunderstorm was located over Port
  Everglades, or over Fort Lauderdale, moving northeast at 10 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...
  Fort Lauderdale, Hollywood, Davie, Plantation and Sunrise. 

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 2601 8024 2617 8024 2616 8005 2601 8007
TIME...MOT...LOC 2018Z 232DEG 7KT 2610 8013 

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

Weinman

2 follow-up statements

824 
WWUS52 KMFL 112043
SVSMFL

Severe Weather Statement
National Weather Service Miami FL
443 PM EDT Sun Apr 11 2021

FLC011-112115-
/O.CON.KMFL.SV.W.0010.000000T0000Z-210411T2115Z/
Broward FL-
443 PM EDT Sun Apr 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR SOUTHERN BROWARD COUNTY...

At 443 PM EDT, a severe thunderstorm was located over Dania Beach, or
over Hollywood, moving east 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...
Fort Lauderdale, Hollywood, Davie, Plantation and Sunrise. 

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 2601 8024 2617 8024 2616 8005 2601 8007
TIME...MOT...LOC 2043Z 250DEG 15KT 2604 8013 

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

Weinman

419 
WWUS52 KMFL 112058
SVSMFL

Severe Weather Statement
National Weather Service Miami FL
458 PM EDT Sun Apr 11 2021

FLC011-112107-
/O.CAN.KMFL.SV.W.0010.000000T0000Z-210411T2115Z/
Broward FL-
458 PM EDT Sun Apr 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN BROWARD COUNTY IS
CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.  However gusty winds are
still possible with thunderstorms in the vicinity.

A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
southeastern Florida.

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

LAT...LON 2601 8024 2617 8024 2616 8005 2601 8007
TIME...MOT...LOC 2056Z 232DEG 7KT 2606 8011 

$$

Weinman

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 10, 8:12 PM EDT	Severe Thunderstorm Warning	MFL	Palm Beach	33 min
Apr 10, 8:46 PM EDT	Special Marine Warning	MFL		44 min
Apr 10, 8:46 PM EDT	Special Weather Statement	MFL	Broward	44 min
Apr 10, 8:51 PM EDT	Special Weather Statement	MFL	Palm Beach	39 min
Apr 10, 8:55 PM EDT	Special Marine Warning	MFL		65 min
Apr 10, 9:16 PM EDT	Special Weather Statement	MFL	Palm Beach	44 min
Apr 11, 9:22 AM EDT	Small Craft Advisory	MFL		17 hr
Apr 11, 1:33 PM EDT	Special Weather Statement	MFL	Palm Beach	42 min
Apr 11, 1:58 PM EDT	Special Weather Statement	MFL	Glades	47 min
Apr 11, 2:05 PM EDT	Special Marine Warning	MFL		85 min
Apr 11, 2:25 PM EDT	Severe Thunderstorm Warning	MFL	Glades	35 min
Apr 11, 2:33 PM EDT	Special Weather Statement	MFL	Palm Beach	57 min
Apr 11, 2:39 PM EDT	Severe Thunderstorm Warning	MFL	Palm Beach	66 min
Apr 11, 2:47 PM EDT	Special Weather Statement	MFL	Glades	43 min
Apr 11, 2:49 PM EDT	Special Marine Warning	MFL		86 min
Apr 11, 2:56 PM EDT	Severe Thunderstorm Warning	MFL	Palm Beach	64 min
Apr 11, 3:04 PM EDT	Special Weather Statement	MFL	Glades	41 min
Apr 11, 3:30 PM EDT	Special Weather Statement	MFL	Glades, Hendry	45 min
Apr 11, 3:30 PM EDT	Special Weather Statement	MFL	Broward	60 min
Apr 11, 3:32 PM EDT	Special Marine Warning	MFL		58 min
Apr 11, 3:39 PM EDT	Special Marine Warning	MFL		96 min
Apr 11, 3:50 PM EDT	Special Marine Warning	MFL		85 min
Apr 11, 4:08 PM EDT	Special Marine Warning	MFL		97 min
Apr 11, 4:12 PM EDT	Special Weather Statement	MFL	Hendry	48 min
Apr 11, 4:14 PM EDT	Special Weather Statement	MFL	Broward	61 min
Apr 11, 4:35 PM EDT	Special Weather Statement	MFL	Broward	55 min
Apr 11, 4:56 PM EDT	Special Weather Statement	MFL	Collier	49 min
Apr 11, 5:06 PM EDT	Special Marine Warning	MFL		84 min
Apr 11, 5:15 PM EDT	Special Weather Statement	MFL	Miami-Dade	60 min
Apr 11, 5:16 PM EDT	Special Marine Warning	MFL		89 min
Apr 11, 5:24 PM EDT	Severe Thunderstorm Warning	MFL	Broward, Miami-Dade	36 min
Apr 11, 5:46 PM EDT	Special Marine Warning	MFL		89 min
Apr 11, 5:49 PM EDT	Special Weather Statement	MFL	Monroe	41 min
Apr 11, 6:09 PM EDT	Severe Thunderstorm Warning	MFL	Miami-Dade	36 min
Apr 11, 6:16 PM EDT	Special Weather Statement	MFL	Miami-Dade	44 min
Apr 11, 6:31 PM EDT	Special Weather Statement	MFL	Monroe	44 min
Apr 11, 6:35 PM EDT	Special Marine Warning	MFL		55 min
Apr 11, 6:38 PM EDT	Special Marine Warning	MFL		67 min
Apr 11, 7:00 PM EDT	Special Weather Statement	MFL	Miami-Dade	45 min
Apr 11, 7:31 PM EDT	Special Marine Warning	MFL		59 min

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.