Alert archive / Florida / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 22, NWS Miami, FL

May 31, 2021Collier County, Florida

NWS Miami, FL issued this severe thunderstorm warning at May 31, 2021, 4:29 PM EDT for Collier County, Florida. It was in force for 31 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: May 31, 2021, 4:29 PM EDT (20:29 UTC)
Expired: May 31, 2021, 5:00 PM EDT
In force: 31 min
Issued by: NWS Miami, FL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Collier County, FL

The radar

The Miami radar (KAMX), 138 km from the middle of the area, began a volume at 20:29 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

Time	Report	Where	Remark
May 31, 4:40 PM EDT	TSTM WND GST 60	1 Ene Lely, FL	STORM SPOTTER REPORTED PEA SIZE HAIL AND WIND GUSTS 60 MPH AT 951 AND RATTLESNAKE HAMMOCK.

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, 8.5 hours before the alert went out and 143 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: 1852 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 869 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -4 m²/s²
0-3 km storm-relative helicity: 10 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

751 
WUUS52 KMFL 312029
SVRMFL
FLC021-312100-
/O.NEW.KMFL.SV.W.0022.210531T2029Z-210531T2100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Miami FL
429 PM EDT Mon May 31 2021

The National Weather Service in Miami has issued a

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

* Until 500 PM EDT.

* At 429 PM EDT, severe thunderstorms were located along a line
  extending from Golden Gate to near Royal Palm Hammock, moving west
  at 20 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Naples, Marco Island, Golden Gate Estates, Cape Romano and Belle
  Meade.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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.

&&

LAT...LON 2612 8185 2618 8185 2624 8167 2601 8149
      2583 8144 2585 8176
TIME...MOT...LOC 2029Z 108DEG 16KT 2618 8167 2592 8155 

HAIL...1.00IN
WIND...60MPH
 
$$

CWC

The office that day

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

Issued	Product	Office	Counties	Lasted
May 31, 12:33 PM EDT	Special Weather Statement	MFL	Monroe	57 min
May 31, 1:15 PM EDT	Special Weather Statement	MFL	Broward	45 min
May 31, 3:33 PM EDT	Special Weather Statement	MFL	Hendry	42 min
May 31, 3:49 PM EDT	Special Weather Statement	MFL	Collier	41 min
May 31, 4:08 PM EDT	Special Marine Warning	MFL		67 min
May 31, 4:13 PM EDT	Special Weather Statement	MFL	Collier	47 min
May 31, 4:40 PM EDT	Special Marine Warning	MFL		35 min
May 31, 4:59 PM EDT	Severe Thunderstorm Warning	MFL	Collier	31 min
May 31, 5:13 PM EDT	Special Marine Warning	MFL		47 min

Nearby

Severe Thunderstorm Warnings in Florida, 2021 Every 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.