Alert archive / Florida / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 8, NWS Miami, FL

April 11, 2021Palm Beach County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Apr 11, 2021, 2:39 PM EDT for Palm Beach County, Florida. It was in force for 66 min. 11 reports 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, 2:39 PM EDT (18:39 UTC)
Expired: Apr 11, 2021, 3:45 PM EDT
In force: 66 min
Issued by: NWS Miami, FL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 70.0 mph

County Palm Beach County, FL

The radar

The Melbourne radar (KMLB), 138 km from the middle of the area, began a volume at 18:40 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, 2:58 PM EDT	TSTM WND DMG	Tequesta, FL	DELAYED REPORT. MULTIPLE REPORTS FROM THE TEQUESTA AREA INCLUDING DOWNED TREES AND POWER LINES AND DAMAGE TO A RAILROAD CROSSING GATE. FROM SOCIAL MEDIA REPORTS AND PICTURES. TIME ESTIMATED FROM RADAR.
Apr 11, 3:00 PM EDT	TSTM WND DMG	2 Nne Lion Country Safa, FL	TRAINED SPOTTER CALLED IN AND REPORTED SEVERAL DOWNED TREE BRANCHES. BRANCHES WERE ESTIMATED TO BE APPROXIMATELY 5 TO 6 INCHES IN GIRTH.
Apr 11, 3:00 PM EDT	TSTM WND DMG	2 Ssw Philo Farms, FL	DELAYED REPORT. SMALL HARDWOOD TREE DOWNED IN JUPITER FARMS. SOCIAL MEDIA REPORT. TIME ESTIMATED FROM RADAR.
Apr 11, 3:02 PM EDT	TSTM WND GST 48	1 Nne Lion Country Safa, FL	PEAK GUST SO FAR. MESONET STATION FW4571 LOXAHATCHEE.
Apr 11, 3:02 PM EDT	MARINE TSTM WIND 56	2 Se Jupiter, FL	DELAYED REPORT. A MARINE THUNDERSTORM WIND GUST OF 56 MPH / 49 KNOTS WAS RECORDED AT MESONET STATION XOAK OAKES SUBSTATION.
Apr 11, 3:05 PM EDT	MARINE TSTM WIND 63	1 N Juno Beach, FL	DELAYED REPORT. A MARINE THUNDERSTORM WIND GUST OF 63 MPH / 55 KNOTS WAS RECORDED BY MESONET STATION XJUP JUNO BEACH PIER.
Apr 11, 3:05 PM EDT	TSTM WND GST 63	1 N Juno Beach, FL	MESONET STATION XJUP JUNO BEACH PIER RECORDED A 63 MPH (55 KT) WIND GUST ASSOCIATED WITH A SEVERE THUNDERSTORM OVER PALM BEACH COUNTY. STATION ELEVATION: 20 FT.
Apr 11, 3:05 PM EDT	MARINE TSTM WIND 63	1 N Juno Beach, FL	DELAYED REPORT. A MARINE THUNDERSTORM WIND GUST OF 63 MPH / 55 KNOTS WAS RECORDED BY MESONET STATION XJUP JUNO BEACH PIER.
Apr 11, 3:08 PM EDT	HAIL 0.25	1 Sw Philo Farms, FL	TRAINED SPOTTER CALLED IN AND REPORTED PEA-SIZED HAIL BETWEEN JUPITER FARMS RD AND W INDIANTOWN RD.
Apr 11, 3:15 PM EDT	TSTM WND DMG	2 Se Belle Glade, FL	CALLER REPORTED ROOF DAMAGE AT RESIDENCE LOCATED AT SE AVE K PL ASSOCIATED WITH A SEVERE THUNDERSTORM.
Apr 11, 3:45 PM EDT	MARINE TSTM WIND 39	7 W Pahokee, FL	DELAYED REPORT. A MARINE THUNDERSTORM WIND GUST OF 39 MPH / 34 KNOTS WAS RECORDED BY THE SFWMD MESONET SITE L006 LOCATED OVER THE SOUTHERN END 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

Miami, FL (KMFL), launched 12:00Z, 6.7 hours before the alert went out and 119 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: 1240 J/kg
Mixed-layer CIN: -44 J/kg
Mixed-layer LCL: 856 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 100 m²/s²
0-3 km storm-relative helicity: 132 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.8

Open this sounding in Storm Lab

The text

As transmitted.

691 
WUUS52 KMFL 111839
SVRMFL
FLC099-111945-
/O.NEW.KMFL.SV.W.0008.210411T1839Z-210411T1945Z/

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

The National Weather Service in Miami has issued a

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

* Until 345 PM EDT.

* At 239 PM EDT, severe thunderstorms were located along a line
  extending from Jensen Beach to 6 miles west of Pahokee, moving
  southeast at 30 mph.

  HAZARD...70 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect considerable 
           tree damage. Wind damage is also likely to mobile homes, 
           roofs, and outbuildings.

* Locations impacted include...
  West Palm Beach, Jupiter, Palm Beach Gardens, Belle Glade and
  Pahokee.

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 2687 8003 2651 8054 2681 8090 2684 8087
      2679 8082 2691 8070 2698 8069 2702 8064
      2696 8061 2696 8014 2697 8014 2697 8003
TIME...MOT...LOC 1839Z 298DEG 24KT 2725 8024 2682 8077 

HAIL...1.00IN
WIND...70MPH
 
$$

Weinman

1 follow-up statement

481 
WWUS52 KMFL 111919
SVSMFL

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

FLC099-111945-
/O.CON.KMFL.SV.W.0008.000000T0000Z-210411T1945Z/
Palm Beach FL-
319 PM EDT Sun Apr 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM EDT
FOR NORTHERN PALM BEACH COUNTY...

At 319 PM EDT, severe thunderstorms were located along a line
extending from near Jupiter to near Lion Country Safari Park to near
Belle Glade, moving east at 25 mph.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
West Palm Beach, Jupiter, Palm Beach Gardens, Belle Glade and
Pahokee.

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 2687 8003 2651 8054 2681 8090 2684 8087
      2679 8082 2691 8070 2698 8069 2702 8064
      2696 8061 2696 8014 2697 8014 2697 8003
TIME...MOT...LOC 1919Z 256DEG 22KT 2695 8016 2675 8037 2670 8062 

HAIL...1.00IN
WIND...70MPH
 
$$

Weinman

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, 2:25 PM EDT	Severe Thunderstorm Warning	MFL	Glades	35 min
Apr 11, 2:33 PM EDT	Special Weather Statement	MFL	Palm Beach	57 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.