Alert archive / Florida / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 7, NWS Miami, FL

April 11, 2021Glades County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Apr 11, 2021, 2:25 PM EDT for Glades County, Florida. It was in force for 35 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: Apr 11, 2021, 2:25 PM EDT (18:25 UTC)
Expired: Apr 11, 2021, 3:00 PM EDT
In force: 35 min
Issued by: NWS Miami, FL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Glades County, FL

The radar

The Melbourne radar (KMLB), 119 km from the middle of the area, began a volume at 18:27 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
Apr 11, 2:34 PM EDT	MARINE TSTM WIND 43	1 S Buckhead Ridge, FL	DELAYED REPORT. A MARINE THUNDERSTORM WIND GUST OF 43 MPH / 37 KNOTS WAS RECORDED BY MESONET STATION EW1361 OKEECHOBEE, LOCATED ON THE NORTHWEST CORNER OF LAKE OKEECHOBEE.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 11, 2:03 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Tampa Bay, FL (KTBW), launched 12:00Z, 6.4 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: 1004 J/kg
Mixed-layer CIN: -131 J/kg
Mixed-layer LCL: 1005 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 288 m²/s²
0-3 km storm-relative helicity: 296 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

As transmitted.

251 
WUUS52 KMFL 111825
SVRMFL
FLC043-111900-
/O.NEW.KMFL.SV.W.0007.210411T1825Z-210411T1900Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Miami FL
225 PM EDT Sun Apr 11 2021

The National Weather Service in Miami has issued a

* Severe Thunderstorm Warning for...
  Eastern Glades County in southern Florida...

* Until 300 PM EDT.

* At 225 PM EDT, a severe thunderstorm was located near Buckhead
  Ridge, moving northeast at 40 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...
  Lakeport, Buckhead Ridge, Brighton Seminole Reservation and Indian
  Prairie Canal Mouth.

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 2719 8091 2717 8090 2717 8088 2714 8087
      2720 8083 2719 8081 2713 8079 2706 8085
      2700 8087 2695 8100 2693 8100 2685 8116
      2699 8129 2703 8130 2703 8127 2712 8127
      2712 8117 2721 8117 2721 8094
TIME...MOT...LOC 1825Z 244DEG 36KT 2715 8093 

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

CWC

1 follow-up statement

892 
WWUS52 KMFL 111841
SVSMFL

Severe Weather Statement
National Weather Service Miami FL
241 PM EDT Sun Apr 11 2021

FLC043-111900-
/O.CON.KMFL.SV.W.0007.000000T0000Z-210411T1900Z/
Glades FL-
241 PM EDT Sun Apr 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM EDT
FOR EASTERN GLADES COUNTY...

At 241 PM EDT, a severe thunderstorm was located over Treasure
Island, moving northeast at 40 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...
Lakeport, Buckhead Ridge, Brighton Seminole Reservation and Indian
Prairie Canal Mouth.

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 2719 8091 2717 8090 2717 8088 2714 8087
      2720 8083 2719 8081 2713 8079 2706 8085
      2700 8087 2695 8100 2693 8100 2685 8116
      2699 8129 2703 8130 2703 8127 2712 8127
      2712 8117 2721 8117 2721 8094
TIME...MOT...LOC 1841Z 244DEG 36KT 2722 8076 

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
Apr 10, 8:12 PM EDT	Severe Thunderstorm Warning	MFL	Palm Beach	33 min
Apr 10, 8:46 PM EDT	Special Marine Warning	MFL		44 min
Apr 10, 8:46 PM EDT	Special Weather Statement	MFL	Broward	44 min
Apr 10, 8:51 PM EDT	Special Weather Statement	MFL	Palm Beach	39 min
Apr 10, 8:55 PM EDT	Special Marine Warning	MFL		65 min
Apr 10, 9:16 PM EDT	Special Weather Statement	MFL	Palm Beach	44 min
Apr 11, 9:22 AM EDT	Small Craft Advisory	MFL		17 hr
Apr 11, 1:33 PM EDT	Special Weather Statement	MFL	Palm Beach	42 min
Apr 11, 1:58 PM EDT	Special Weather Statement	MFL	Glades	47 min
Apr 11, 2:05 PM EDT	Special Marine Warning	MFL		85 min
Apr 11, 2:33 PM EDT	Special Weather Statement	MFL	Palm Beach	57 min
Apr 11, 2:39 PM EDT	Severe Thunderstorm Warning	MFL	Palm Beach	66 min
Apr 11, 2:47 PM EDT	Special Weather Statement	MFL	Glades	43 min
Apr 11, 2:49 PM EDT	Special Marine Warning	MFL		86 min
Apr 11, 2:56 PM EDT	Severe Thunderstorm Warning	MFL	Palm Beach	64 min
Apr 11, 3:04 PM EDT	Special Weather Statement	MFL	Glades	41 min
Apr 11, 3:30 PM EDT	Special Weather Statement	MFL	Glades, Hendry	45 min
Apr 11, 3:30 PM EDT	Special Weather Statement	MFL	Broward	60 min
Apr 11, 3:32 PM EDT	Special Marine Warning	MFL		58 min
Apr 11, 3:39 PM EDT	Special Marine Warning	MFL		96 min
Apr 11, 3:50 PM EDT	Special Marine Warning	MFL		85 min
Apr 11, 4:08 PM EDT	Special Marine Warning	MFL		97 min
Apr 11, 4:12 PM EDT	Special Weather Statement	MFL	Hendry	48 min
Apr 11, 4:14 PM EDT	Special Weather Statement	MFL	Broward	61 min
Apr 11, 4:18 PM EDT	Severe Thunderstorm Warning	MFL	Broward	40 min
Apr 11, 4:35 PM EDT	Special Weather Statement	MFL	Broward	55 min
Apr 11, 4:56 PM EDT	Special Weather Statement	MFL	Collier	49 min
Apr 11, 5:06 PM EDT	Special Marine Warning	MFL		84 min
Apr 11, 5:15 PM EDT	Special Weather Statement	MFL	Miami-Dade	60 min
Apr 11, 5:16 PM EDT	Special Marine Warning	MFL		89 min
Apr 11, 5:24 PM EDT	Severe Thunderstorm Warning	MFL	Broward, Miami-Dade	36 min
Apr 11, 5:46 PM EDT	Special Marine Warning	MFL		89 min
Apr 11, 5:49 PM EDT	Special Weather Statement	MFL	Monroe	41 min
Apr 11, 6:09 PM EDT	Severe Thunderstorm Warning	MFL	Miami-Dade	36 min
Apr 11, 6:16 PM EDT	Special Weather Statement	MFL	Miami-Dade	44 min
Apr 11, 6:31 PM EDT	Special Weather Statement	MFL	Monroe	44 min
Apr 11, 6:35 PM EDT	Special Marine Warning	MFL		55 min
Apr 11, 6:38 PM EDT	Special Marine Warning	MFL		67 min
Apr 11, 7:00 PM EDT	Special Weather Statement	MFL	Miami-Dade	45 min
Apr 11, 7:31 PM EDT	Special Marine Warning	MFL		59 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.