An upper level trough in north Florida started pushing through the state during the two day period. This helped to increase afternoon and evening thunderstorm activity resulting in flooding in some locations.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS TBW wrote it up.
An upper level trough in north Florida started pushing through the state during the two day period. This helped to increase afternoon and evening thunderstorm activity resulting in flooding in some locations.
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 Tampa Bay, FL wrote its last area forecast discussion before the first event at Sep 9, 12:56 PM EST, 3 hours 4 minutes earlier.
Area Forecast Discussion National Weather Service Tampa Bay Ruskin FL 156 PM EDT Wed Sep 9 2020 .DISCUSSION... A trough is currently over Florida. This trough is located from a line through St. Petersburg and crosses the state through St. Augustine. This trough will help to enhance the shower and storm activity we are already expecting for the area. Showers and storms are already starting to pop up in South Florida and in the Gulf of Mexico. As we go through the rest of the afternoon and evening showers and storms will mainly form inland before slowly heading towards the west coast in the late afternoon and evening hours. No major changes expected in the forecast through the end of the week and early part of the weekend. We will still have plenty of tropical moisture over the area with mainly easterly flow. This means our typical seabreeze activity will continue with storms forming inland in the afternoon before heading towards the west coast in the late afternoon and evening hours. By Sunday and early next week a weak upper level low or open wave looks to push over Florida and into the Gulf of Mexico. This could only help to produce even more shower and storms activity for Sunday and early next week. && .AVIATION... VFR conditions will prevail with onshore winds through the afternoon hours. Scattered showers and isolated storms can be expected this afternoon, so will hold VCTS after 18Z. No other aviation impacts expected. && .MARINE... High pressure to the north will keep light easterly winds in place for the next several days, with an onshore flow developing with the sea breeze each afternoon. Winds and seas will be higher near showers and thunderstorms, but no headlines are expected. && .FIRE WEATHER... Scattered to numerous showers and thunderstorms are expected each day. No fire weather concerns as relative humidity values will remain well above critical levels. No significant fog is expected. && .Preliminary Point Temps/PoPs... TPA 76 90 76 92 / 50 70 50 70 FMY 75 91 75 92 / 40 70 50 70 GIF 74 91 74 92 / 50 70 30 80 SRQ 75 91 75 92 / 40 70 60 60 BKV 73 91 74 92 / 60 70 50 70 SPG 76 90 76 92 / 50 70 60 60 && .TBW WATCHES/WARNINGS/ADVISORIES... FL...None. Gulf waters...None. && DISCUSSION/AVIATION/MARINE/FIRE WEATHER...27/Shiveley DECISION SUPPORT...24/Hubbard
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TAMPA BAY RUSKIN FL
215 PM EDT WED SEP 9 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0130 PM WATER SPOUT 6 ESE BOCA GRANDE 26.72N 82.17W
09/09/2020 GMZ836 FL BROADCAST MEDIA
BROADCAST MEDIA REPORTED A WATERSPOUT JUST
OFF OF BOKEELIA EARLIER THIS AFTERNOON.
&&The national radar mosaic for the moment the first event began.
6 flood. Local standard time, as filed.
Law Enforcement reports flooding on South Lois Ave between Morrison and Swan Ave.
Flooding on S Manhattan Ave between W Price Ave and W Gandy Blvd. Road is impassable.
Law Enforcement reports flooding on Sherwood Ave and West Paul Ave.
HAM operator reports street flooding in Bradenton area with 4 inches of rain in a short amount of time.
Traffic camera showing street flooding on US41 from downtown Bradenton to Cortez Ave.
Public works reports stream flooding that is causing some flooding on 37th street east.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Florida in 2020Every state in 2020This day in weather historyWarnings in Florida, September 2020
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: 913516, 913551, 913552, 914400, 913555, 914401.