Alert archive / Florida / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 64, NWS Miami, FL

October 8, 2021Palm Beach County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Oct 8, 2021, 9:59 PM EDT for Palm Beach County, Florida. It was in force for 46 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 8, 2021, 9:59 PM EDT (01:59 UTC)
Expired
Oct 8, 2021, 10:45 PM EDT
In force
46 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), 97 km from the middle of the area, began a volume at 02:04 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 8, 10:32 PM EDTTSTM WND GST 4915 Wnw Boca Raton Eques, FLMESONET STATION LOHF1 AT LOXAHATCHEE REPORTED A 49 MPH WIND GUST AT 10:32 PM.

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, 2.0 hours before the alert went out and 73 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 2021-10-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1997 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 2021-10-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 22 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
1997 J/kg
Mixed-layer CIN
-23 J/kg
Mixed-layer LCL
973 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
22 m²/s²
0-3 km storm-relative helicity
40 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

The text

As transmitted.

553 
WUUS52 KMFL 090159
SVRMFL
FLC099-090245-
/O.NEW.KMFL.SV.W.0064.211009T0159Z-211009T0245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Miami FL
959 PM EDT Fri Oct 8 2021

The National Weather Service in Miami has issued a

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

* Until 1045 PM EDT.

* At 959 PM EDT, severe thunderstorms were located along a line
  extending from 6 miles west of Loxahatchee NWR to 14 miles east of
  Holey Land Wildlife Refuge, moving east at 15 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Boca Raton, Boynton Beach, Delray Beach, Wellington and Ocean
  Ridge.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into a
small central room in a sturdy structure.

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.

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

&&

LAT...LON 2654 8003 2640 8015 2633 8025 2634 8063
      2650 8073 2668 8047
TIME...MOT...LOC 0159Z 285DEG 13KT 2654 8044 2649 8051 

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

$$

RAG

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, 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, 3:12 PM EDTSevere Thunderstorm WarningMFLPalm Beach33 min
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.