Alert archive / Florida / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 66, NWS Miami, FL

October 28, 2021Collier County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Oct 28, 2021, 8:36 PM EDT for Collier County, Florida. It was in force for 39 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
Oct 28, 2021, 8:36 PM EDT (00:36 UTC)
Expired
Oct 28, 2021, 9:15 PM EDT
In force
39 min
Issued by
NWS Miami, FL
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

County Collier County, FL

The radar

The Miami radar (KAMX), 149 km from the middle of the area, began a volume at 00:39 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 00:00Z, 0.6 hours before the alert went out and 151 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 2021-10-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1336 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 2021-10-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 111 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
1336 J/kg
Mixed-layer CIN
-15 J/kg
Mixed-layer LCL
891 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
111 m²/s²
0-3 km storm-relative helicity
117 m²/s²
Significant tornado parameter
0.6
Supercell composite
3.2

Open this sounding in Storm Lab

The text

As transmitted.

132 
WUUS52 KMFL 290036
SVRMFL
FLC021-290115-
/O.NEW.KMFL.SV.W.0066.211029T0036Z-211029T0115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Miami FL
836 PM EDT Thu Oct 28 2021

The National Weather Service in Miami has issued a

* Severe Thunderstorm Warning for...
  Northwestern Collier County in southwestern Florida...

* Until 915 PM EDT.

* At 835 PM EDT, a severe thunderstorm was located near Naples,
  moving northeast at 35 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Naples, Golden Gate Estates, Naples Park, Belle Meade and Marco
  Island Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2633 8184 2633 8182 2632 8182 2632 8166
      2636 8166 2637 8157 2603 8144 2597 8175
      2611 8181 2622 8182
TIME...MOT...LOC 0035Z 241DEG 32KT 2615 8185 

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

$$

AR
1 follow-up statement
728 
WWUS52 KMFL 290106
SVSMFL

Severe Weather Statement
National Weather Service Miami FL
906 PM EDT Thu Oct 28 2021

FLC021-290116-
/O.EXP.KMFL.SV.W.0066.000000T0000Z-211029T0115Z/
Collier FL-
906 PM EDT Thu Oct 28 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN COLLIER COUNTY
WILL EXPIRE AT 915 PM EDT...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.

LAT...LON 2633 8184 2633 8182 2632 8182 2632 8166
      2636 8166 2637 8157 2603 8144 2597 8175
      2611 8181 2622 8182
TIME...MOT...LOC 0106Z 241DEG 32KT 2628 8159 

$$

AR

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 28, 8:06 PM EDTSpecial Weather StatementMFLHendry39 min
Oct 28, 8:10 PM EDTSpecial Weather StatementMFLCollier50 min
Oct 28, 8:42 PM EDTSpecial Marine WarningMFL33 min
Oct 28, 8:48 PM EDTSpecial Weather StatementMFLPalm Beach27 min
Oct 28, 8:52 PM EDTSpecial Marine WarningMFL23 min
Oct 28, 8:53 PM EDTSpecial Weather StatementMFLCollier, Hendry67 min
Oct 28, 9:16 PM EDTSpecial Weather StatementMFLPalm Beach29 min
Oct 28, 9:42 PM EDTSpecial Marine WarningMFL63 min
Oct 28, 10:32 PM EDTSpecial Marine WarningMFL58 min
Oct 28, 10:45 PM EDTSpecial Marine WarningMFL60 min
Oct 28, 11:02 PM EDTSpecial Weather StatementMFLBroward28 min
Oct 29, 12:00 AM EDTSpecial Weather StatementMFLMiami-Dade45 min
Oct 29, 12:17 AM EDTSpecial Weather StatementMFLBroward43 min
Oct 29, 12:25 AM EDTSpecial Marine WarningMFL65 min
Oct 29, 1:01 AM EDTSpecial Marine WarningMFL59 min
Oct 29, 2:31 AM EDTSpecial Marine WarningMFL44 min
Oct 29, 3:39 AM EDTHigh Surf AdvisoryMFLCollier40 hr
Oct 29, 5:42 AM EDTSpecial Marine WarningMFL63 min
Oct 29, 3:36 PM EDTCoastal Flood StatementMFLCollier20 hr

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.