Alert archive / Florida / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 65, NWS Miami, FL

October 9, 2021Palm Beach County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Oct 9, 2021, 3:12 PM EDT for Palm Beach County, Florida. It was in force for 33 min. 1 report 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
Oct 9, 2021, 3:12 PM EDT (19:12 UTC)
Expired
Oct 9, 2021, 3:45 PM EDT
In force
33 min
Issued by
NWS Miami, FL
Area
Storm-based polygon
Tornado
Possible
Hail
0.75 in
Wind
60.0 mph

County Palm Beach County, FL

The radar

The Miami radar (KAMX), 138 km from the middle of the area, began a volume at 19:12 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
Oct 9, 3:31 PM EDTMARINE TSTM WIND 491 N Juno Beach, FLMESONET STATION XJUP JUNO BEACH PIER REPORTED A 49MPH WIND GUST AT 3:31PM AS A STRONG THUNDERSTORM MOVED OFFSHORE. SITE ELEVATION IS 20 FEET.

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, 7.2 hours before the alert went out and 112 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 2021-10-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 103 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Miami, FL at 12:00Z on 2021-10-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 9 square meters per square second.193958Sfc1 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
103 J/kg
Mixed-layer CIN
-279 J/kg
Mixed-layer LCL
1522 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
9 m²/s²
0-3 km storm-relative helicity
78 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

158 
WUUS52 KMFL 091912
SVRMFL
FLC099-091945-
/O.NEW.KMFL.SV.W.0065.211009T1912Z-211009T1945Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Miami FL
312 PM EDT Sat Oct 9 2021

The National Weather Service in Miami has issued a

* Severe Thunderstorm Warning for...
  Northeastern Palm Beach County in southeastern Florida...

* Until 345 PM EDT.

* At 312 PM EDT, severe thunderstorms were located along a line
  extending from near North County Airport to Golden Lakes, moving
  east at 40 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  West Palm Beach, Wellington, Jupiter, Palm Beach Gardens and Lake
  Worth.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 2681 8003 2669 8003 2660 8004 2660 8023
      2696 8038 2696 8014 2697 8014 2697 8006
TIME...MOT...LOC 1912Z 264DEG 36KT 2692 8025 2670 8016 

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

$$

AR
1 follow-up statement
682 
WWUS52 KMFL 091931
SVSMFL

Severe Weather Statement
National Weather Service Miami FL
331 PM EDT Sat Oct 9 2021

FLC099-091945-
/O.CON.KMFL.SV.W.0065.000000T0000Z-211009T1945Z/
Palm Beach FL-
331 PM EDT Sat Oct 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM EDT
FOR NORTHEASTERN PALM BEACH COUNTY...

At 330 PM EDT, severe thunderstorms were located along a line
extending from near Jupiter to near Palm Beach, moving east at 40
mph.

HAZARD...70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
West Palm Beach, Wellington, Jupiter, Palm Beach Gardens and Lake
Worth.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 2681 8003 2669 8003 2660 8004 2660 8023
      2696 8038 2696 8014 2697 8014 2697 8006
TIME...MOT...LOC 1930Z 270DEG 36KT 2693 8007 2671 7998 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

AR

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 8, 8:11 PM EDTSpecial Weather StatementMFLPalm Beach34 min
Oct 8, 8:28 PM EDTSpecial Weather StatementMFLPalm Beach47 min
Oct 8, 9:05 PM EDTSpecial Weather StatementMFLPalm Beach40 min
Oct 8, 9:24 PM EDTAreal Flood AdvisoryMFLPalm Beach2 hr
Oct 8, 9:39 PM EDTSpecial Weather StatementMFLPalm Beach51 min
Oct 8, 9:59 PM EDTSevere Thunderstorm WarningMFLPalm Beach46 min
Oct 8, 10:15 PM EDTSpecial Weather StatementMFLBroward30 min
Oct 8, 10:39 PM EDTSpecial Weather StatementMFLBroward36 min
Oct 9, 12:28 AM EDTSpecial Weather StatementMFLMiami-Dade32 min
Oct 9, 12:55 AM EDTSpecial Weather StatementMFLMiami-Dade35 min
Oct 9, 1:04 AM EDTAreal Flood AdvisoryMFLBroward, Miami-Dade116 min
Oct 9, 1:32 AM EDTSpecial Weather StatementMFLMiami-Dade, Monroe28 min
Oct 9, 1:39 AM EDTAreal Flood AdvisoryMFLMiami-Dade2 hr
Oct 9, 8:22 AM EDTCoastal Flood StatementMFLBroward, Miami-Dade, Palm Beach30 hr
Oct 9, 12:22 PM EDTSpecial Weather StatementMFLGlades53 min
Oct 9, 12:43 PM EDTSpecial Marine WarningMFL62 min
Oct 9, 12:53 PM EDTSpecial Marine WarningMFL67 min
Oct 9, 12:58 PM EDTSpecial Weather StatementMFLGlades32 min
Oct 9, 1:05 PM EDTSpecial Weather StatementMFLHendry40 min
Oct 9, 1:34 PM EDTSpecial Weather StatementMFLHendry41 min
Oct 9, 1:40 PM EDTSpecial Marine WarningMFL65 min
Oct 9, 1:45 PM EDTSpecial Weather StatementMFLBroward45 min
Oct 9, 1:48 PM EDTSpecial Marine WarningMFL27 min
Oct 9, 2:09 PM EDTSpecial Weather StatementMFLPalm Beach51 min
Oct 9, 2:13 PM EDTSpecial Marine WarningMFL2 hr
Oct 9, 2:34 PM EDTSpecial Weather StatementMFLBroward41 min
Oct 9, 2:36 PM EDTSpecial Marine WarningMFL84 min
Oct 9, 2:40 PM EDTSpecial Weather StatementMFLMartin65 min
Oct 9, 2:48 PM EDTAreal Flood AdvisoryMFLPalm Beach3 hr
Oct 9, 2:48 PM EDTAreal Flood AdvisoryMFLPalm Beach3 hr
Oct 9, 3:14 PM EDTSpecial Weather StatementMFLBroward31 min
Oct 9, 3:29 PM EDTSpecial Weather StatementMFLMonroe31 min
Oct 9, 3:44 PM EDTSpecial Weather StatementMFLMartin31 min
Oct 9, 4:06 PM EDTSpecial Marine WarningMFL54 min
Oct 9, 4:11 PM EDTSpecial Weather StatementMFLMiami-Dade34 min
Oct 9, 4:30 PM EDTSpecial Weather StatementMFLMonroe30 min
Oct 9, 6:20 PM EDTSpecial Weather StatementMFLCollier55 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.