Alert archive / Florida / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 21, NWS Miami, FL
NWS Miami, FL issued this severe thunderstorm warning at Aug 9, 2018, 8:54 PM EDT for Palm Beach County, Florida. It was in force for 36 min. 4 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
- Aug 9, 2018, 8:54 PM EDT (00:54 UTC)
- Expired
- Aug 9, 2018, 9:30 PM EDT
- In force
- 36 min
- Issued by
- NWS Miami, FL
- Area
- Storm-based polygon
- Hail
- 0.88 in
- Wind
- 70.0 mph
County Palm Beach County, FL
The radar
The Melbourne radar (KMLB), 133 km from the middle of the area, began a volume at 00:56 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 |
|---|---|---|---|
| Aug 9, 8:55 PM EDT | TSTM WND GST 60 | Port Mayaca, FL | A TRAINED SPOTTER ESTIMATED WINDS GUSTING TO 60-65MPH IN PORT MAYACA AS A STORM MOVED ONSHORE FROM LAKE OKEECHOBEE. |
| Aug 9, 8:56 PM EDT | TSTM WND GST 48 | 4 Nne Canal Point, FL | MESONET SITE C10A S-271 RECORDED A GUST TO 42 KNOTS/48 MPH WITH A THUNDERSTORM. |
| Aug 9, 8:56 PM EDT | TSTM WND DMG | Se Port Mayaca, FL | ...DELAYED REPORT...PUBLIC REPORTS NUMEROUS LARGE TREES DOWN BETWEEN PORT MAYACA TO THE MARTIN/PALM BEACH COUNTY LINE. ANOTHER REPORT VIA SOCIAL MEDIA OF POWERLINES DOWN IN THE SAME AREA ON THE EASTERN SHORE OF LAKE OKEECHOBEE. |
| Aug 9, 9:03 PM EDT | TSTM WND DMG | 7 Nne Canal Point, FL | MEMBER OF PUBLIC, AN EMPLOYEE OF LOCAL BUSINESS, REPORTS NUMEROUS LARGE TREE BRANCHES DOWN, 6-INCHES IN DIAMETER. ALSO, THE TOP OF A PALM TREE WAS SNAPPED OFF. TIME ESTIMATED BASED ON DOPPLER RADAR. |
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 00:00Z, 0.9 hours before the alert went out and 127 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
- 974 J/kg
- Mixed-layer CIN
- -104 J/kg
- Mixed-layer LCL
- 1305 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- 29 m²/s²
- 0-3 km storm-relative helicity
- 79 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
015
WUUS52 KMFL 100054
SVRMFL
FLC099-100130-
/O.NEW.KMFL.SV.W.0021.180810T0054Z-180810T0130Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Miami FL
854 PM EDT THU AUG 9 2018
The National Weather Service in Miami has issued a
* Severe Thunderstorm Warning for...
Northwestern Palm Beach County in southeastern Florida...
* Until 930 PM EDT.
* At 854 PM EDT, a severe thunderstorm was located near Canal Point,
and is nearly stationary.
HAZARD...70 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Expect considerable tree damage. Damage is likely to
mobile homes, roofs, and outbuildings.
* Locations impacted include...
Pahokee, Canal Point and Fremd Village-Padgett Island.
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.
Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 2696 8061 2696 8043 2674 8044 2675 8074
2689 8072 2692 8070 2698 8069 2702 8065
2702 8063
TIME...MOT...LOC 0054Z 295DEG 1KT 2694 8064
HAIL...0.88IN
WIND...70MPH
$$
671 follow-up statement
258
WWUS52 KMFL 100112
SVSMFL
Severe Weather Statement
National Weather Service Miami FL
912 PM EDT THU AUG 9 2018
FLC099-100130-
/O.CON.KMFL.SV.W.0021.000000T0000Z-180810T0130Z/
Palm Beach FL-
912 PM EDT THU AUG 9 2018
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM EDT
FOR NORTHWESTERN PALM BEACH COUNTY...
At 912 PM EDT, a severe thunderstorm was located near Canal Point,
and is nearly stationary.
HAZARD...60 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Pahokee, Canal Point and Fremd Village-Padgett Island.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Miami. You can also share your report with NWS Miami on Facebook and
Twitter.
Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 2696 8061 2696 8043 2674 8044 2675 8074
2689 8072 2692 8070 2698 8069 2702 8065
2702 8063
TIME...MOT...LOC 0112Z 295DEG 1KT 2694 8063
HAIL...0.88IN
WIND...60MPH
$$
67The office that day
Everything else NWS Miami, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 9, 8:12 PM EDT | Special Marine Warning | MFL | 33 min | |
| Aug 9, 8:44 PM EDT | Special Marine Warning | MFL | 31 min | |
| Aug 9, 8:48 PM EDT | Special Weather Statement | MFL | Palm Beach | 42 min |
| Aug 9, 9:11 PM EDT | Special Marine Warning | MFL | 34 min | |
| Aug 9, 9:24 PM EDT | Special Weather Statement | MFL | Palm Beach | 51 min |
| Aug 9, 9:54 PM EDT | Special Weather Statement | MFL | Palm Beach | 51 min |
| Aug 10, 3:28 PM EDT | Special Weather Statement | MFL | Collier | 47 min |
| Aug 10, 3:39 PM EDT | Special Weather Statement | MFL | Miami-Dade | 51 min |
| Aug 10, 3:46 PM EDT | Special Weather Statement | MFL | Palm Beach | 44 min |
| Aug 10, 3:56 PM EDT | Special Marine Warning | MFL | 34 min | |
| Aug 10, 4:05 PM EDT | Special Weather Statement | MFL | Martin | 40 min |
| Aug 10, 4:26 PM EDT | Special Weather Statement | MFL | Collier | 49 min |
| Aug 10, 4:33 PM EDT | Special Marine Warning | MFL | 27 min | |
| Aug 10, 4:41 PM EDT | Special Weather Statement | MFL | Broward, Palm Beach | 79 min |
| Aug 10, 4:55 PM EDT | Special Marine Warning | MFL | 95 min | |
| Aug 10, 5:35 PM EDT | Severe Thunderstorm Warning | MFL | Miami-Dade | 25 min |
| Aug 10, 5:38 PM EDT | Special Marine Warning | MFL | 37 min | |
| Aug 10, 5:57 PM EDT | Special Weather Statement | MFL | Miami-Dade | 48 min |
| Aug 10, 6:15 PM EDT | Special Marine Warning | MFL | 90 min | |
| Aug 10, 7:55 PM EDT | Special Marine Warning | MFL | 35 min |
Nearby
Severe Thunderstorm Warnings in Florida, 2018Every severe thunderstorm warning in 2018
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.