Onshore flow and shallow moisture produced several convergent bands of cumulus clouds over the near shore coastal waters. One land produced a narrow waterspout, undetectable by NWS Dopper Radar.
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The episode as NWS JAX wrote it up.
Onshore flow and shallow moisture produced several convergent bands of cumulus clouds over the near shore coastal waters. One land produced a narrow waterspout, undetectable by NWS Dopper Radar. The waterspout was first observed east of Neptune Beach, then it was observed well south of Mayport as a funnel cloud about 5 minutes.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Jacksonville, FL wrote its last area forecast discussion before the first event at Sep 16, 8:50 AM EST, 3 hours 40 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE JACKSONVILLE FL 950 AM EDT THU SEP 16 2010 .UPDATE... LOCAL JAX 12Z SOUNDING SHOWED A SLIGHT INCREASE IN MOISTURE WITH PRECIP WATER AMOUNTS CLOSE TO 1.32 INCHES AND A FAIRLY SATURATED PROFILE BELOW 800 MB. WITH ISOLD SHOWERS ALREADY OVER THE COASTAL WATERS IN EASTERLY STEERING FLOW...EXPECT SOME OF THOSE TO MOVE ONSHORE THIS MORNING AND TRANSLATE INLAND THIS AFTERNOON. LIFTED INDICES TO REMAIN POSITIVE SO DONT EXPECT ANY TSTM ACTIVITY BUT NOT OUT OF THE QUESTION LATE THIS AFTERNOON OR EVENING AS IT BUMPS UP AGAINST STATIONARY GOMEX SBRZ WEST OF I-75. MAX TEMPS IN THE MID/UPPER 80S ALONG THE COAST...TO THE LOWER 90S WELL INLAND AND ALONG THE I-75 CORRIDOR. FOR TONIGHT...FAIR SKIES WITH JUST THE SILENT 10% CHANCE OF A COASTAL SHOWER IN LINGERING ONSHORE FLOW. LIGHT WINDS AND LOW LEVEL MOISTURE FROM ONSHORE FLOW SHOULD PROMOTE SHALLOW FOG FORMATION OVER INLAND AREAS...WITH SOME PATCHY DENSE FOG POSSIBLE OVER INLAND SERN GA. && .AVIATION... VFR CONDITIONS TODAY WITH OCCASIONAL CEILINGS AROUND 4K FEET. ISOLATED COASTAL SHOWERS EXPECTED TODAY BUT NOT ENOUGH COVERAGE TO WARRANT PLACING IN THE TAFS AT THIS TIME. && .MARINE... ONSHORE FLOW WILL CONTINUE AS LONG PERIOD SWELLS FROM IGOR INCREASE OVER THE COASTAL WATERS TO 4 TO 6 FEET TODAY THEN INTO THE 5 TO 7 FEET RANGE TONIGHT...AND WILL LIKELY NEED TO RAISE SMALL CRAFT ADVISORY FLAGS WITH THE AFTERNOON PACKAGE...FOR NOW WILL KEEP SMALL CRAFT EXERCISE CAUTION CRITERIA AS EAST WINDS WILL CONTINUE AROUND 15 MPH WITH THE BUILDING SEAS. && .PRELIMINARY POINT TEMPS/POPS... AMG 91 67 92 67 / 10 0 0 10 SSI 86 73 86 73 / 10 0 0 10 JAX 87 69 88 69 / 20 10 0 10 SGJ 86 72 86 74 / 20 10 0 10 GNV 90 68 91 67 / 20 10 10 10 OCF 91 68 91 68 / 20 10 10 10 && .JAX WATCHES/WARNINGS/ADVISORIES... FL...NONE. GA...NONE. AM...NONE. && HESS/ENYEDI/WALKER
HAZARDOUS WEATHER OUTLOOK...CORRECTION NATIONAL WEATHER SERVICE JACKSONVILLE FL 454 AM EDT THU SEP 16 2010 FLZ020>025-030>033-035>038-040-GAZ132>136-149>154-162>166-171000- ALACHUA-APPLING-ATKINSON-BACON-BAKER-BRADFORD-BRANTLEY- CAMDEN (COASTAL)-CAMDEN (INLAND)-CHARLTON-CLAY-CLINCH-COFFEE- COLUMBIA-DUVAL-ECHOLS-FLAGLER-GILCHRIST-GLYNN (COASTAL)- GLYNN (INLAND)-HAMILTON-JEFF DAVIS-MARION-NASSAU-PIERCE-PUTNAM- ST JOHNS-SUWANNEE-UNION-WARE-WAYNE- 454 AM EDT THU SEP 16 2010 THIS OUTLOOK IS FOR NORTHEAST FLORIDA AND SOUTHEAST GEORGIA. .DAY ONE...TODAY AND TONIGHT... ...MODERATE RISK OF RIP CURRENTS AT AREA BEACHES... A PERSISTENT ONSHORE FLOW AND A DEVELOPING LONG PERIOD SWELL FROM DISTANT HURRICANE IGOR WILL BRING A MODERATE RISK OF RIP CURRENT AT AREA BEACHES. ADDITIONAL INFORMATION CAN BE FOUND IN THE SURF ZONE FORECAST PRODUCT. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY... ...RISK OF DANGEROUS RIP CURRENTS WILL INCREASE THROUGH THE WEEKEND AS HURRICANE IGOR PASSES WELL TO OUR EAST... A PERSISTENT ONSHORE FLOW AND INCREASING SWELLS GENERATED FROM DISTANT HURRICANE IGOR WILL BRING AN INCREASING RISK OF DANGEROUS RIP CURRENTS. BREAKER HEIGHTS NEAR 7 FEET WILL BE POSSIBLE THIS WEEKEND. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED AT THIS TIME. FOR ADDITIONAL INFORMATION...VISIT THE NATIONAL WEATHER SERVICE IN JACKSONVILLE WEBSITE ON THE INTERNET AT WEATHER.GOV/JAX. ECZ
The Jacksonville radar (KJAX), 39 km away, was scanning. The volume nearest the first event began at 17:28 UTC.
1 funnel cloud. Local standard time, as filed.
A funnel cloud was reported 10 miles south of Mayport by a military forecaster.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Florida in 2010Every state in 2010This day in weather historyWarnings in Florida, September 2010
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 254654.