Alert archive / Florida / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 29, NWS Miami, FL

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

NWS Miami, FL issued this severe thunderstorm warning at Jun 20, 2021, 4:20 PM EDT for Broward County, Palm Beach County, Florida. It was in force for 25 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
Jun 20, 2021, 4:20 PM EDT (20:20 UTC)
Expired
Jun 20, 2021, 4:45 PM EDT
In force
25 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), 83 km from the middle of the area, began a volume at 20:25 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, 8.3 hours before the alert went out and 60 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.

344 
WUUS52 KMFL 202020
SVRMFL
FLC011-099-202045-
/O.NEW.KMFL.SV.W.0029.210620T2020Z-210620T2045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Miami FL
420 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 445 PM EDT.

* At 420 PM EDT, a severe thunderstorm was located 7 miles northwest
  of Coral Springs, 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, Coral Springs, Pompano Beach, Sunrise and Boca
  Raton.

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 2652 8038 2641 8009 2616 8016 2616 8035
      2637 8060
TIME...MOT...LOC 2020Z 281DEG 11KT 2632 8036 

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

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, 4:26 PM EDTSpecial Weather StatementMFLPalm Beach49 min
Jun 20, 4:41 PM EDTSevere Thunderstorm WarningMFLBroward, Palm 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.