Alert archive / Florida / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 10, NWS Melbourne, FL
NWS Melbourne, FL issued this severe thunderstorm warning at Apr 11, 2021, 2:17 PM EDT for 4 counties in Florida. It was in force for 58 min. 16 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, 2:17 PM EDT (18:17 UTC)
- Expired
- Apr 11, 2021, 3:15 PM EDT
- In force
- 58 min
- Issued by
- NWS Melbourne, FL
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 70.0 mph
Counties Indian River County, FL, Martin County, FL, Okeechobee County, FL, Saint Lucie County, FL
The radar
The Melbourne radar (KMLB), 102 km from the middle of the area, began a volume at 18:18 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, 2:43 PM EDT | TSTM WND GST 60 | 4 Nnw Saint Lucie Nucle, FL | WEATHERFLOW SITE XSTL AT THE ST. LUCIE NPP MEASURED A PEAK WIND GUST OF 60MPH OR 52KT. A SECOND WIND GUST OF 50KT/58MPH WAS MEASURED AT 248 PM. |
| Apr 11, 2:45 PM EDT | TSTM WND DMG | 1 Nw Indiantown, FL | OFF-DUTY NWS METEOROLOGIST REPORTED A METAL AWNING RIPPED OFF A CLUBHOUSE NEAR INDIANWOOD GULF CLUB. OTHER MINOR DAMAGE OCCURRED TO SIGNS NEARBY. |
| Apr 11, 2:45 PM EDT | TSTM WND GST 47 | 7 Nne Indiantown, FL | SFWMD MESONET IN ALLAPATTAH FLATS MEASURED A PEAK WIND GUST OF 47 MPH. |
| Apr 11, 2:50 PM EDT | TSTM WND GST 63 | Witham Field, FL | THE AWOS AT STUART WITHAM FIELD MEASURED A PEAK WIND GUST OF 55KT/63MPH FROM THE NW. |
| Apr 11, 2:51 PM EDT | TSTM WND GST 71 | 2 Sw Hobe Sound, FL | WEATHERFLOW SITE XHOB AT HOBE SOUND MEASURED A PEAK WIND GUST OF 71MPH/62KT. A SECOND PEAK GUST OF 64MPH/56KT WAS OBSERVED AT 256PM. |
| Apr 11, 2:52 PM EDT | TSTM WND DMG | 5 Sse Jensen Beach, FL | LOCAL BROADCAST MEDIA REPORTED A VERY LARGE TREE WAS KNOCKED DOWN ON A PROPERTY NEAR SE ST. LUCIE BLVD IN STUART, JUST SOUTH OF THE AIRPORT AND GOLF COURSE. TIME IS ESTIMATED FROM RADAR. |
| Apr 11, 2:52 PM EDT | TSTM WND DMG | 5 Sse Jensen Beach, FL | A TRAINED SPOTTER REPORTED NUMEROUS DOWNED BRANCHES THAT WERE 4-5 INCHES IN DIAMETER, NEAR SEWALL POINT. |
| Apr 11, 2:54 PM EDT | TSTM WND DMG | 1 Se Jensen Beach, FL | PUBLIC REPORTS DAMAGE IN SOUTH JENSEN BEACH, WHICH CONSISTED OF DOWNED TREE LIMBS, BACKYARD ITEMS THROWN AROUND, AND A COVERED PORCH THAT WAS LIFTED AND DROPPED A FEW FEET AWAY. |
| Apr 11, 2:54 PM EDT | TSTM WND GST 68 | 6 Sse Jensen Beach, FL | TRAINED SPOTTER MEASURED A PEAK WIND GUST OF 68MPH/59KT AT ROCKY POINT NEAR STUART. PEAK SUSTAINED WIND WAS 38MPH. |
| Apr 11, 2:56 PM EDT | TSTM WND DMG | 2 Sse Hobe Sound, FL | LOCAL MEDIA REPORTS A LARGE TREE WAS DOWNED ACROSS SE DUNCAN STREET AND SE FLAMINGO DRIVE IN HOBE SOUND, BLOCKING THE ROAD. |
| Apr 11, 2:57 PM EDT | HAIL 0.7 | 2 Wsw Jensen Beach, FL | TRAINED SPOTTER REPORTS DIME SIZED HAIL IN JENSEN BEACH. |
| Apr 11, 3:03 PM EDT | HAIL 1.75 | 1 S Hobe Sound, FL | LOCAL BROADCAST MEDIA REPORTS GOLF BALL SIZED HAIL IN HOBE SOUND. |
| Apr 11, 3:04 PM EDT | TSTM WND GST 48 | 1 Nw Tequesta, FL | PEAK GUST SO FAR. MESONET STATION CW8019 JUPITER. |
| Apr 11, 3:04 PM EDT | MARINE TSTM WIND 48 | 1 Nw Tequesta, FL | DELAYED REPORT. A MARINE THUNDERSTORM WIND GUST OF 48 MPH / 42 KNOTS WAS RECORDED BY MESONET STATION CW8019 JUPITER. |
| Apr 11, 3:06 PM EDT | HAIL 1 | 2 Nw Hobe Sound, FL | TRAINED SPOTTER REPORTS QUARTER SIZED HAIL IN HOBE SOUND. |
| Apr 11, 3:07 PM EDT | HAIL 0.7 | 2 Wsw Jensen Beach, FL | TRAINED SPOTTER REPORTS DIME SIZED HAIL IN JENSEN BEACH. |
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, 8:15 AM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
The nearest sounding before it
Cape Canaveral, FL (KXMR), launched 12:00Z, 6.3 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.
- Mixed-layer CAPE
- 449 J/kg
- Mixed-layer CIN
- -181 J/kg
- Mixed-layer LCL
- 1002 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 202 m²/s²
- 0-3 km storm-relative helicity
- 199 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.2
The text
As transmitted.
568
WUUS52 KMLB 111817
SVRMLB
FLC061-085-093-111-111915-
/O.NEW.KMLB.SV.W.0010.210411T1817Z-210411T1915Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Melbourne FL
217 PM EDT Sun Apr 11 2021
The National Weather Service in Melbourne has issued a
* Severe Thunderstorm Warning for...
St. Lucie County in east central Florida...
Okeechobee County in east central Florida...
Southeastern Indian River County in east central Florida...
Martin County in east central Florida...
* Until 315 PM EDT.
* At 217 PM EDT, a severe thunderstorm was located 10 miles west of
Treasure Coast Airport, or 11 miles southwest of Indrio, moving
southeast at 45 mph.
HAZARD...70 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect considerable tree damage. Damage is likely to
mobile homes, roofs, and outbuildings.
* Locations impacted include...
Port Saint Lucie, Jupiter, Walton, Fort Pierce and Stuart.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 2697 8008 2697 8014 2695 8015 2696 8061
2711 8066 2716 8071 2721 8081 2714 8087
2719 8091 2723 8099 2730 8100 2733 8105
2736 8103 2738 8107 2738 8111 2742 8114
2765 8033 2719 8013 2703 8008
TIME...MOT...LOC 1817Z 332DEG 38KT 2745 8052
HAIL...<.75IN
WIND...70MPH
$$
Smith2 follow-up statements
770
WWUS52 KMLB 111856
SVSMLB
Severe Weather Statement
National Weather Service Melbourne FL
256 PM EDT Sun Apr 11 2021
FLC061-111906-
/O.CAN.KMLB.SV.W.0010.000000T0000Z-210411T1915Z/
Indian River FL-
256 PM EDT Sun Apr 11 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN INDIAN RIVER
COUNTY IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 400 PM EDT for
east central Florida.
LAT...LON 2696 8061 2711 8066 2716 8071 2721 8081
2719 8084 2714 8087 2719 8091 2723 8098
2753 8029 2719 8013 2703 8008 2697 8008
2697 8014 2695 8015
TIME...MOT...LOC 1856Z 332DEG 38KT 2708 8030
$$
FLC085-093-111-111915-
/O.CON.KMLB.SV.W.0010.000000T0000Z-210411T1915Z/
St. Lucie FL-Okeechobee FL-Martin FL-
256 PM EDT Sun Apr 11 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM EDT
FOR ST. LUCIE...SOUTHEASTERN OKEECHOBEE AND MARTIN COUNTIES...
At 256 PM EDT, a severe thunderstorm was located near Palm City,
moving southeast at 45 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...
Port Saint Lucie, Jupiter, Walton, Fort Pierce and Stuart.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 2696 8061 2711 8066 2716 8071 2721 8081
2719 8084 2714 8087 2719 8091 2723 8098
2753 8029 2719 8013 2703 8008 2697 8008
2697 8014 2695 8015
TIME...MOT...LOC 1856Z 332DEG 38KT 2708 8030
HAIL...1.00IN
WIND...70MPH
$$
Smith252
WWUS52 KMLB 111910
SVSMLB
Severe Weather Statement
National Weather Service Melbourne FL
310 PM EDT Sun Apr 11 2021
FLC085-093-111-111919-
/O.EXP.KMLB.SV.W.0010.000000T0000Z-210411T1915Z/
St. Lucie FL-Okeechobee FL-Martin FL-
310 PM EDT Sun Apr 11 2021
...THE SEVERE THUNDERSTORM WARNING FOR ST. LUCIE...SOUTHEASTERN
OKEECHOBEE AND MARTIN COUNTIES WILL EXPIRE AT 315 PM EDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire. However gusty
winds over 40 mph are still occurring with this thunderstorm.
A Severe Thunderstorm Watch remains in effect until 400 PM EDT for
east central Florida.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Melbourne.
LAT...LON 2696 8061 2711 8066 2716 8071 2721 8081
2719 8084 2714 8087 2719 8091 2723 8098
2753 8029 2719 8013 2703 8008 2697 8008
2697 8014 2695 8015
TIME...MOT...LOC 1909Z 332DEG 38KT 2698 8024
$$
SmithThe office that day
Everything else NWS Melbourne, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 11, 4:31 AM EDT | Special Weather Statement | MLB | Flagler | 44 min |
| Apr 11, 7:38 AM EDT | Special Marine Warning | MLB | 2 hr | |
| Apr 11, 7:43 AM EDT | Special Weather Statement | MLB | Volusia | 62 min |
| Apr 11, 8:45 AM EDT | Special Weather Statement | MLB | Volusia | 45 min |
| Apr 11, 9:19 AM EDT | Special Marine Warning | MLB | 26 min | |
| Apr 11, 9:45 AM EDT | Special Weather Statement | MLB | Lake | 60 min |
| Apr 11, 10:35 AM EDT | Severe Thunderstorm Warning | MLB | Orange, Seminole | 23 min |
| Apr 11, 10:56 AM EDT | Severe Thunderstorm Warning | MLB | Seminole, Volusia | 30 min |
| Apr 11, 11:01 AM EDT | Special Weather Statement | MLB | Lake | 44 min |
| Apr 11, 11:05 AM EDT | Special Weather Statement | MLB | Seminole | 10 min |
| Apr 11, 11:29 AM EDT | Special Marine Warning | MLB | 2 hr | |
| Apr 11, 11:31 AM EDT | Special Weather Statement | MLB | Seminole, Volusia | 44 min |
| Apr 11, 11:39 AM EDT | Special Weather Statement | MLB | Lake, Orange | 66 min |
| Apr 11, 11:45 AM EDT | Special Weather Statement | MLB | Volusia | 60 min |
| Apr 11, 12:23 PM EDT | Severe Thunderstorm Warning | MLB | Lake, Orange, Osceola | 52 min |
| Apr 11, 12:39 PM EDT | Special Weather Statement | MLB | Brevard, Osceola | 66 min |
| Apr 11, 1:04 PM EDT | Special Weather Statement | MLB | Seminole | 41 min |
| Apr 11, 1:08 PM EDT | Special Marine Warning | MLB | 3 hr | |
| Apr 11, 1:13 PM EDT | Special Weather Statement | MLB | Indian River, Okeechobee | 62 min |
| Apr 11, 1:55 PM EDT | Severe Thunderstorm Warning | MLB | Brevard, Indian River | 36 min |
| Apr 11, 2:11 PM EDT | Special Weather Statement | MLB | Indian River, Martin, Okeechobee, Saint Lucie | 94 min |
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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.