Alert archive / Florida / Areal Flood Advisories in 2021
Areal Flood Advisory 52, NWS Melbourne, FL
NWS Melbourne, FL issued this areal flood advisory at Aug 14, 2021, 4:03 PM EDT for Lake County, Florida. It was in force for 117 min.
The area
The counties it named.
The facts
- Issued
- Aug 14, 2021, 4:03 PM EDT (20:03 UTC)
- Expired
- Aug 14, 2021, 6:00 PM EDT
- In force
- 117 min
- Issued by
- NWS Melbourne, FL
- Area
- Storm-based polygon
County Lake County, FL
The radar
The Melbourne radar (KMLB), 126 km from the middle of the area, began a volume at 20:04 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.
The nearest sounding before it
Cape Canaveral, FL (KXMR), launched 12:00Z, 8.1 hours before the alert went out and 123 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
- 1264 J/kg
- Mixed-layer CIN
- -11 J/kg
- Mixed-layer LCL
- 800 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 83 m²/s²
- 0-3 km storm-relative helicity
- 53 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.8
What forecasters said that day
The local office's own words before this areal flood advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Melbourne, FL wrote its last area forecast discussion before this areal flood advisory went out at Aug 14, 4:00 PM EDT, 3 minutes earlier.
Area forecast discussion, Aug 14, 4:00 PM EDT, 3 minutes before
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</html>Hazardous weather outlook, Aug 14, 10:58 AM EDT, 5 hours 5 minutes before
Hazardous Weather Outlook National Weather Service Melbourne FL 1058 AM EDT Sat Aug 14 2021 AMZ550-552-555-570-572-575-FLZ041-044>047-053-054-058-059-064-141- 144-147-150000- Flagler Beach to Volusia-Brevard County Line 0-20 nm-Volusia- Brevard County Line to Sebastian Inlet 0-20 nm- Sebastian Inlet to Jupiter Inlet 0-20 nm-Flagler Beach to Volusia- Brevard County Line 20-60 nm-Volusia- Brevard County Line to Sebastian Inlet 20-60 nm- Sebastian Inlet to Jupiter Inlet 20-60 nm-Inland Volusia- Northern Lake-Orange-Seminole-Southern Brevard-Osceola- Indian River-Okeechobee-St. Lucie-Martin-Coastal Volusia- Southern Lake-Northern Brevard- 1058 AM EDT Sat Aug 14 2021 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL FLORIDA. .DAY ONE...TODAY AND TONIGHT. .THUNDERSTORM IMPACT... Scattered lightning storms will occur today into tonight. By early afternoon additional activity will develop, with highest coverage expected across the interior including the Space and Treasure Coast. Gusty winds over 40 mph, frequent cloud to ground lightning, and heavy downpours will be possible in any strong storm which develops. Even though the threat for tornadoes remains very low today, we cannot rule out a brief, weak spin up, especially as strong thunderstorms over the Atlantic push onshore through this evening. .FLOOD IMPACT... Numerous showers and lightning storms will result in some locations receiving 2 to 3 inches of rainfall, especially for those who see multiple rounds of heavy rain. The highest potential will be across Martin, Saint Lucie, Indian River, and Brevard counties. Standing water in low spots may create a driving hazard on low spots along roadways. A Flood Watch remains in effect for the Treasure Coast. The most sensitive area is in northeast Martin County, between Stuart, Palm City, North River Shores, and Jensen Beach where 6 to 8 inches of rain has fallen in the last 24 hours. Additional heavy rainfall in these areas could worsen any ongoing flood issues. .RIP CURRENT IMPACT... There is a moderate threat for life-threatening rip currents at all Central Florida Atlantic beaches today. Remember to always swim at a life guarded beach and never enter the surf alone. .MARINE THUNDERSTORM GUST IMPACT... Scattered lightning storms will continue over the local Atlantic waters today and tonight, with the strongest storms capable of producing wind gusts in excess of 35 knots and frequent lightning strikes. .WATERSPOUT IMPACT... Even though the threat is low, cannot rule out a brief waterspout developing over the Atlantic waters and along the coast into this evening. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY. The remnants of Fred will track northward over the eastern Gulf of Mexico Sunday into Monday. Despite Fred moving further from the region, scattered to numerous lightning storms containing locally heavy rainfall remain possible across the much of the area next week. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed today and tonight. Spotters are encouraged to report any rainfall amounts over 3 inches and any localized flooding impact to the National Weather Service in Melbourne. Rodriguez
In the hours before
Special weather statement, Aug 14, 3:27 PM EDT, 36 minutes before
Special Weather Statement
National Weather Service Melbourne FL
327 PM EDT Sat Aug 14 2021
FLZ044-144-142000-
Northern Lake County FL-Southern Lake County FL-
327 PM EDT Sat Aug 14 2021
...A strong thunderstorm will impact portions of west
central and southwestern Lake County through 400 PM EDT...
At 325 PM EDT, Doppler radar was tracking a strong thunderstorm near
Groveland, moving northwest at 15 mph.
HAZARD...Winds in excess of 40 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Locations impacted include...
Leesburg, Eustis, Tavares, Lady Lake and Mount Dora.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with this storm and may lead
to localized flooding. Frequent to excessive lightning is also
occurring with this storm. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 2896 8195 2896 8169 2880 8165 2851 8180
2857 8196
TIME...MOT...LOC 1925Z 131DEG 13KT 2863 8183
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH
SedlockLocal storm report, Aug 14, 3:44 PM EDT, 19 minutes before
PRELIMINARY LOCAL STORM REPORT
National Weather Service Melbourne FL
344 PM EDT SAT AUG 14 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0339 PM TSTM WND GST LEESBURG AIRPORT 28.82N 81.81W
08/14/2021 M41 MPH LAKE FL ASOS
GUST TO 36 KT/41 MPH FROM THE EAST AT KLEE.
&&
JCSpecial weather statement, Aug 14, 3:55 PM EDT, 8 minutes before
Special Weather Statement
National Weather Service Melbourne FL
355 PM EDT Sat Aug 14 2021
FLZ044-144-142030-
Northern Lake County FL-Southern Lake County FL-
355 PM EDT Sat Aug 14 2021
...Strong thunderstorms will impact portions of west central Lake
County through 430 PM EDT...
At 354 PM EDT, Doppler radar was tracking a strong thunderstorm over
Leesburg and another over Lake Yale, moving northwest at 15 mph.
HAZARD...Winds in excess of 40 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Locations impacted include...
Leesburg, Eustis, Lady Lake, Lake Griffin and Lisbon.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building. Torrential
downpours as well as frequent to excessive lightning were occurring
with both of these storms.
&&
LAT...LON 2896 8195 2896 8166 2900 8166 2896 8157
2872 8195
TIME...MOT...LOC 1954Z 126DEG 15KT 2882 8186
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH
SedlockThe office that day
Everything else NWS Melbourne, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 13, 8:19 PM EDT | Areal Flood Advisory | MLB | Martin | 116 min |
| Aug 13, 8:34 PM EDT | Special Marine Warning | MLB | 86 min | |
| Aug 13, 9:13 PM EDT | Areal Flood Warning | MLB | Martin, Saint Lucie | 3 hr |
| Aug 14, 3:24 PM EDT | Areal Flood Advisory | MLB | Lake, Volusia | 3 hr |
| Aug 14, 3:27 PM EDT | Special Weather Statement | MLB | Lake | 33 min |
| Aug 14, 3:55 PM EDT | Special Weather Statement | MLB | Lake | 35 min |
| Aug 14, 4:09 PM EDT | Areal Flood Advisory | MLB | Volusia | 3 hr |
Nearby
Areal Flood Advisories in Florida, 2021Every areal flood advisory 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.