Alert archive / Florida / Special Weather Statements in 2021

Special Weather Statement, NWS Miami, FL

December 21, 2021Collier County, Florida

NWS Miami, FL issued this special weather statement at Dec 21, 2021, 5:41 AM EST for Collier County, Florida. It was in force for 49 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: Dec 21, 2021, 5:41 AM EST (10:41 UTC)
Expired: Dec 21, 2021, 6:30 AM EST
In force: 49 min
Issued by: NWS Miami, FL
Hail: 0.88 in
Wind: 55

County Collier County, FL

The radar

The Miami radar (KAMX), 153 km from the middle of the area, began a volume at 10:42 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, 10.7 hours before the alert went out and 153 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 578 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 809 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: -13 m²/s²
0-3 km storm-relative helicity: 32 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Miami, FL wrote its last area forecast discussion before this special weather statement went out at Dec 21, 3:09 AM EST, 2 hours 32 minutes earlier.

Area forecast discussion, Dec 21, 3:09 AM EST, 2 hours 32 minutes before

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Hazardous weather outlook, Dec 21, 4:20 AM EST, 1 hour 21 minutes before

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In the hours before

Special weather statement, Dec 21, 5:41 AM EST, 0 minutes before

Special Weather Statement
National Weather Service Miami FL
541 AM EST Tue Dec 21 2021

FLZ069-070-211130-
Coastal Collier County FL-Inland Collier County FL-
541 AM EST Tue Dec 21 2021

...A strong thunderstorm will impact portions of northwestern Collier
County through 630 AM EST...

At 541 AM EST, National Weather Service meteorologists were tracking
a strong thunderstorm capable of producing a funnel cloud 12 miles
southwest of Lovers Key State Park, or 14 miles west of Bonita
Springs, moving northeast at 50 mph.

HAZARD...Funnel clouds, wind gusts of 50 to 55 mph, and nickel size
         hail.

SOURCE...Radar indicated.

IMPACT...Funnel clouds occasionally touch down and produce tornadoes
         or waterspouts. Gusty winds could knock down tree limbs and
         blow around unsecured objects.

Locations impacted include...
Naples, Immokalee, Golden Gate Estates, Naples Park, Orangetree,
Golden Gate, Big Corkscrew Island, Vineyards, North Naples, East
Naples, Pelican Bay, Corkscrew Swamp Sanctuary, Quail Creek Estate
and Lake Trafford.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These winds can down small tree limbs and branches, and blow around
unsecured small objects. Seek shelter in a safe building until the
storm passes.

This activity was also developing in an environment favorable for the
formation of funnel clouds. Stay tuned to NOAA weather radio and
local media for additional updates and possible warnings.

A Tornado Watch remains in effect until 1000 AM EST for southwestern
Florida.

&&

LAT...LON 2633 8185 2633 8182 2632 8182 2632 8166
      2642 8166 2642 8157 2651 8156 2639 8142
      2611 8180 2611 8185
TIME...MOT...LOC 1041Z 233DEG 43KT 2628 8201

FUNNEL CLOUD...POSSIBLE
MAX HAIL SIZE...0.88 IN
MAX WIND GUST...55 MPH

Kelly

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 20, 7:22 PM EST	Rip Current Statement	MFL	Broward, Collier, Miami-Dade, Palm Beach	48 hr
Dec 21, 1:34 AM EST	Gale Warning	MFL		20 hr
Dec 21, 1:34 AM EST	Small Craft Advisory	MFL		8 hr
Dec 21, 1:34 AM EST	Small Craft Advisory	MFL		44 hr
Dec 21, 3:28 AM EST	Special Marine Warning	MFL		62 min
Dec 21, 3:34 AM EST	Wind Advisory	MFL	Collier, Glades, Hendry, Palm Beach	14 hr
Dec 21, 4:06 AM EST	Special Marine Warning	MFL		39 min
Dec 21, 4:38 AM EST	Special Marine Warning	MFL		52 min
Dec 21, 5:18 AM EST	Special Marine Warning	MFL		57 min
Dec 21, 7:45 AM EST	Special Marine Warning	MFL		30 min
Dec 21, 7:57 AM EST	Special Weather Statement	MFL	Palm Beach	33 min
Dec 21, 8:06 AM EST	Special Marine Warning	MFL		39 min
Dec 21, 8:27 AM EST	Special Weather Statement	MFL	Collier	48 min
Dec 21, 8:59 AM EST	Special Weather Statement	MFL	Broward	46 min
Dec 21, 9:45 AM EST	Special Weather Statement	MFL	Miami-Dade	45 min
Dec 21, 10:25 AM EST	Special Weather Statement	MFL	Miami-Dade	50 min
Dec 21, 10:28 AM EST	Special Marine Warning	MFL		92 min
Dec 21, 11:08 AM EST	Severe Thunderstorm Warning	MFL	Miami-Dade	22 min

Nearby

Special Weather Statements in Florida, 2021 Every special weather statement 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.