Alert archive / Florida / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 30, NWS Miami, FL

June 20, 2021Broward County, Palm Beach County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Jun 20, 2021, 4:41 PM EDT for Broward County, Palm Beach County, Florida. It was in force for 49 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
Jun 20, 2021, 4:41 PM EDT (20:41 UTC)
Expired
Jun 20, 2021, 5:30 PM EDT
In force
49 min
Issued by
NWS Miami, FL
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Broward County, FL, Palm Beach County, FL

The radar

The Miami radar (KAMX), 74 km from the middle of the area, began a volume at 20:43 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

TimeReportWhereRemark
Jun 20, 4:57 PM EDTTSTM WND DMG1 Ssw Coconut Creek, FLPHOTO VIA SOCIAL MEDIA OF LARGE DOWNED TREE ON THE SOUTHERN SIDE OF THE INTERSECTION OF BANKS ROAD AND WEST COPANS ROAD. TIME ESTIMATED FROM RADAR.
Jun 20, 4:58 PM EDTTSTM WND DMGCoral Springs, FLVERY LARGE HARDWOOD TREE BRANCHES DOWNED WITHIN THE CITY OF CORAL SPRINGS. VIDEO SHARED VIA SOCIAL MEDIA BY THE CITY. RADAR ESTIMATED WINDS WERE AROUND 50 KT / 58 MPH DURING THE ESTIMATED TIME WHEN DAMAGE OCCURRED.

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

The nearest sounding before it

Miami, FL (KMFL), launched 12:00Z, 8.7 hours before the alert went out and 51 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 2021-06-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2018 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 12:00Z on 2021-06-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -6 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
2018 J/kg
Mixed-layer CIN
-24 J/kg
Mixed-layer LCL
893 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
-6 m²/s²
0-3 km storm-relative helicity
-12 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

464 
WUUS52 KMFL 202041
SVRMFL
FLC011-099-202130-
/O.NEW.KMFL.SV.W.0030.210620T2041Z-210620T2130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Miami FL
441 PM EDT Sun Jun 20 2021

The National Weather Service in Miami has issued a

* Severe Thunderstorm Warning for...
  Northern Broward County in southeastern Florida...
  Southeastern Palm Beach County in southeastern Florida...

* Until 530 PM EDT.

* At 441 PM EDT, severe thunderstorms were located along a line
  extending from 6 miles west of Coral Springs to Margate, moving
  south at 5 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, Coral Springs, Pompano Beach, Davie and
  Plantation.

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 2631 8055 2604 8028 2607 8019 2639 8006
      2653 8028
TIME...MOT...LOC 2041Z 001DEG 5KT 2629 8036 2624 8022 

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

HVN
1 follow-up statement
710 
WWUS52 KMFL 202123
SVSMFL

Severe Weather Statement
National Weather Service Miami FL
523 PM EDT Sun Jun 20 2021

FLC011-099-202132-
/O.EXP.KMFL.SV.W.0030.000000T0000Z-210620T2130Z/
Broward FL-Palm Beach FL-
523 PM EDT Sun Jun 20 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN BROWARD AND
SOUTHEASTERN PALM BEACH COUNTIES WILL EXPIRE AT 530 PM EDT...
    
The storms which prompted the warning have weakened below severe
limits, and have exited the warned area. Therefore, the warning will 
be allowed to expire. However gusty winds are still possible with 
these thunderstorms.

LAT...LON 2631 8055 2604 8028 2607 8019 2639 8006
      2653 8028
TIME...MOT...LOC 2122Z 001DEG 5KT 2616 8036 2611 8022 

$$

HVN

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 20, 2:46 PM EDTSpecial Weather StatementMFLBroward44 min
Jun 20, 3:16 PM EDTSpecial Weather StatementMFLPalm Beach44 min
Jun 20, 3:27 PM EDTSpecial Weather StatementMFLBroward48 min
Jun 20, 3:28 PM EDTSpecial Weather StatementMFLPalm Beach47 min
Jun 20, 3:45 PM EDTSpecial Weather StatementMFLBroward45 min
Jun 20, 3:56 PM EDTSpecial Weather StatementMFLBroward19 min
Jun 20, 4:11 PM EDTSevere Thunderstorm WarningMFLBroward, Miami-Dade49 min
Jun 20, 4:14 PM EDTSpecial Weather StatementMFLBroward61 min
Jun 20, 4:17 PM EDTSpecial Weather StatementMFLMiami-Dade58 min
Jun 20, 4:20 PM EDTSevere Thunderstorm WarningMFLBroward, Palm Beach25 min
Jun 20, 4:26 PM EDTSpecial Weather StatementMFLPalm Beach49 min
Jun 20, 4:47 PM EDTSpecial Weather StatementMFLMiami-Dade43 min
Jun 20, 4:56 PM EDTSpecial Marine WarningMFL66 min
Jun 20, 5:00 PM EDTSpecial Weather StatementMFLBroward30 min
Jun 20, 5:07 PM EDTAreal Flood AdvisoryMFLBroward, Palm Beach3 hr
Jun 20, 5:15 PM EDTSpecial Weather StatementMFLPalm Beach45 min
Jun 20, 5:15 PM EDTSpecial Weather StatementMFLMiami-Dade45 min
Jun 20, 5:26 PM EDTSpecial Weather StatementMFLBroward49 min
Jun 20, 5:28 PM EDTSpecial Marine WarningMFL47 min
Jun 20, 5:28 PM EDTSpecial Weather StatementMFLPalm Beach47 min
Jun 20, 5:48 PM EDTSpecial Marine WarningMFL57 min
Jun 20, 5:50 PM EDTSpecial Weather StatementMFLPalm Beach55 min
Jun 20, 5:59 PM EDTSpecial Weather StatementMFLMiami-Dade46 min
Jun 20, 6:02 PM EDTAreal Flood AdvisoryMFLMiami-Dade3 hr
Jun 20, 6:40 PM EDTSpecial Weather StatementMFLHendry50 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.