Alert archive / Florida / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 60, NWS Miami, FL

August 25, 2021Broward County, Palm Beach County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Aug 25, 2021, 9:04 PM EDT for Broward County, Palm Beach County, Florida. It was in force for 41 min. 3 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
Aug 25, 2021, 9:04 PM EDT (01:04 UTC)
Expired
Aug 25, 2021, 9:45 PM EDT
In force
41 min
Issued by
NWS Miami, FL
Area
Storm-based polygon
Tornado
Possible
Hail
0.75 in
Wind
60.0 mph

Counties Broward County, FL, Palm Beach County, FL

The radar

The Miami radar (KAMX), 130 km from the middle of the area, began a volume at 01:03 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
Aug 25, 9:11 PM EDTMARINE TSTM WIND 451 N Juno Beach, FLA MARINE THUNDERSTORM WIND GUST OF 39 KT / 45 MPH WAS RECORDED BY MESONET STATION XJUP JUNO BEACH PIER.
Aug 25, 9:12 PM EDTMARINE TSTM WIND 471 Ne Boca Raton, FLA MARINE THUNDERSTORM WIND GUST OF 41 KT / 47 MPH WAS RECORDED BY THE MESONET STATION XBOC BOCA RATON.
Aug 25, 9:15 PM EDTTSTM WND GST 453 Nnw Boynton Beach, FLA THUNDERSTORM WIND GUST OF 45 MPH WAS RECORDED BY MESONET STATION AR978 BOYNTON BEACH.

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 00:00Z, 1.1 hours before the alert went out and 105 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 2021-08-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 458 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 2021-08-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -62 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
458 J/kg
Mixed-layer CIN
-28 J/kg
Mixed-layer LCL
927 m above ground
0-6 km bulk shear
6 kt
0-1 km storm-relative helicity
-62 m²/s²
0-3 km storm-relative helicity
-54 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

433 
WUUS52 KMFL 260104
SVRMFL
FLC011-099-260145-
/O.NEW.KMFL.SV.W.0060.210826T0104Z-210826T0145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Miami FL
904 PM EDT Wed Aug 25 2021

The National Weather Service in Miami has issued a

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

* Until 945 PM EDT.

* At 903 PM EDT, severe thunderstorms were located along a line
  extending from 11 miles northeast of Juno Beach to 10 miles
  southeast of Hillsboro Beach, moving west at 40 to 45 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Coral Springs, West Palm Beach, Pompano Beach, Boca Raton and
  Deerfield Beach.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2697 8003 2622 8003 2625 8045 2696 8039
      2696 8014 2697 8014
TIME...MOT...LOC 0103Z 068DEG 41KT 2697 7991 2622 7993 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

BAXTER
1 follow-up statement
157 
WWUS52 KMFL 260136
SVSMFL

Severe Weather Statement
National Weather Service Miami FL
936 PM EDT Wed Aug 25 2021

FLC011-099-260145-
/O.EXP.KMFL.SV.W.0060.000000T0000Z-210826T0145Z/
Broward FL-Palm Beach FL-
936 PM EDT Wed Aug 25 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN BROWARD AND EASTERN
PALM BEACH COUNTIES WILL EXPIRE AT 945 PM EDT...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty
winds are still possible with these thunderstorms.

LAT...LON 2697 8003 2622 8003 2625 8045 2696 8039
      2696 8014 2697 8014
TIME...MOT...LOC 0135Z 068DEG 41KT 2684 8026 2609 8028 

$$

BAXTER

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 25, 8:01 PM EDTSpecial Marine WarningMFL89 min
Aug 25, 8:39 PM EDTSpecial Weather StatementMFLPalm Beach66 min
Aug 25, 9:42 PM EDTSpecial Weather StatementMFLPalm Beach48 min
Aug 25, 9:45 PM EDTSpecial Marine WarningMFL90 min
Aug 25, 9:50 PM EDTSpecial Weather StatementMFLMiami-Dade40 min
Aug 25, 9:51 PM EDTSpecial Marine WarningMFL84 min
Aug 25, 10:52 PM EDTSpecial Weather StatementMFLGlades53 min
Aug 25, 11:27 PM EDTSpecial Weather StatementMFLBroward33 min
Aug 26, 12:04 AM EDTSpecial Weather StatementMFLPalm Beach41 min
Aug 26, 12:07 AM EDTSpecial Marine WarningMFL53 min
Aug 26, 12:42 AM EDTSpecial Weather StatementMFLBroward33 min
Aug 26, 1:27 AM EDTSpecial Weather StatementMFLPalm Beach63 min
Aug 26, 1:58 AM EDTSpecial Weather StatementMFLMartin32 min
Aug 26, 2:00 AM EDTSpecial Marine WarningMFL30 min
Aug 26, 2:23 AM EDTSpecial Weather StatementMFLPalm Beach67 min
Aug 26, 2:55 AM EDTSpecial Marine WarningMFL65 min
Aug 26, 3:13 AM EDTSpecial Weather StatementMFLMonroe47 min
Aug 26, 3:25 AM EDTSpecial Weather StatementMFLMiami-Dade50 min
Aug 26, 4:17 AM EDTSpecial Marine WarningMFL58 min
Aug 26, 4:19 AM EDTSpecial Weather StatementMFLMiami-Dade56 min
Aug 26, 4:30 AM EDTSpecial Weather StatementMFLPalm Beach60 min
Aug 26, 5:10 AM EDTSpecial Weather StatementMFLMiami-Dade50 min
Aug 26, 6:23 AM EDTSpecial Weather StatementMFLCollier52 min
Aug 26, 6:41 AM EDTSpecial Weather StatementMFLBroward49 min
Aug 26, 7:37 AM EDTSpecial Marine WarningMFL23 min
Aug 26, 7:38 AM EDTSpecial Weather StatementMFLPalm Beach37 min
Aug 26, 3:11 PM EDTSpecial Weather StatementMFLGlades64 min
Aug 26, 3:36 PM EDTSpecial Marine WarningMFL24 min
Aug 26, 5:40 PM EDTSpecial Marine WarningMFL35 min
Aug 26, 5:40 PM EDTSpecial Weather StatementMFLCollier35 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.