Heavy Rain in Florida, September 9, 2020

Name: Heavy Rain in Florida, September 9, 2020
Start: 2020-09-09T17:45
End: 2020-09-09T19:30
Location: Florida

September 9, 2020 · NWS JAX · 1 event in 1 county or zone

Onshore flow over a moist airmass and weak ESE steering flow < 10 kts produced air mass storms with locally heavy rainfall.

Where it happened

Every event with a place to put it. Tap one for its entry below.

Tornadoes
Tropical storms and surge
Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

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The toll

Deaths: 0
Injuries: 0
Property damage: None recorded
Crop damage: None recorded
Events: 1

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.

What happened

The episode as NWS JAX wrote it up.

Onshore flow over a moist airmass and weak ESE steering flow < 10 kts produced air mass storms with locally heavy rainfall.

What forecasters said that day

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 9, 2:48 PM EST, 2 hours 57 minutes earlier.

Area forecast discussion, Sep 9, 2:48 PM EST, 2 hours 57 minutes before

Area Forecast Discussion
National Weather Service Jacksonville FL
348 PM EDT Wed Sep 9 2020

.NEAR TERM [Tonight through Thursday]...Inverted trough has moved
inland and winds have shifted to the southeast with the passage
of the trough axis now located near the Highway 301 corridor over
se Ga/ne Fl. Scattered to numerous showers with isolated
thunderstorms will continue to shift inland this afternoon and
then decrease this evening. Coastal showers will be possible again
late tonight and Thursday morning. Convection will push inland
and become numerous inland Thurday afternoon as deep tropical
moisture remains over the area.

.SHORT TERM [Thursday night through Saturday Night]...High
pressure to the north with inverted troughs moving west across
the area Friday and Saturday will continue the onshore flow
pattern. Scattered to numerous showers will persist along with
isolated thunderstorms as PWAT values remain high(~2 inches) in a
deep east to southeasterly flow. Temperatures will be a few
degrees above average levels.

.LONG TERM [Sunday Through Wednesday]...Onshore flow continues
with strong high pressure building over the ne U.S. Monday through
Wednesday. A surface cold front will push slowly south across the
area Tuesday into Wednesday which will bring stronger onshore
winds and increasing chances for showers and thunderstorms as
moisture and instability remain across the area. Above average
temperatures Sunday and Monday will become closer to average
Tuesday and Wednesday as clouds and precipitation increase.

&&

.MARINE...Winds will be more southeasterly over the waters tonight
as an inverted trough has moved inland. Weak low pressure to the
east of the waters will move to near the NC coast on Thursday and
then move inland. High pressure will remain to the north of the
region with a series of inverted troughs moving west across the
local waters. East to southeast winds with combined seas of wind
waves and swells will continue over the local waters the next
several days. Scattered to numerous showers with isolated
thunderstorms will also continue at times through the weekend.

Rip Currents: Moderate rip current risk as onshore winds persist.
Elevated risk expected through the weekend.

&&

.PRELIMINARY POINT TEMPS/POPS...

AMG  73  87  72  88  72 /  10  70  20  70  30
SSI  77  86  76  86  77 /  30  60  40  60  50
JAX  76  88  74  88  75 /  30  60  30  60  40
SGJ  76  88  75  88  75 /  30  40  30  60  40
GNV  73  89  73  90  73 /  50  60  20  70  20
OCF  73  89  73  90  73 /  60  70  30  70  20

&&

.JAX WATCHES/WARNINGS/ADVISORIES...
FL...None.
GA...None.
AM...None.
&&

In the hours before

Local storm report, Sep 9, 2:55 PM EST, 2 hours 50 minutes before

PRELIMINARY LOCAL STORM REPORT
National Weather Service Jacksonville FL
355 PM EDT WED SEP 9 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1015 AM     FUNNEL CLOUD     5 NNE FLAGLER BEACH     29.54N 81.10W
09/09/2020                   AMZ454             FL   EMERGENCY MNGR

            EMERGENCY MANAGER RELAYED A REPORT OF A BRIEF FUNNEL
            CLOUD EARLIER THIS MORNING ABOUT 5 TO 7 MILES NORTHEAST
            OF FLAGLER BEACH.

&&

RBRICKER

The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

1 heavy rain. Local standard time, as filed.

Heavy Rain, Alachua

When: September 9, 5:45 PM EST to 7:30 PM EST
Where: Alachua County, 2.4 mi W of Traxler
Reported by: Mesonet
Coordinates: 29.870, -82.570

A public weather station measured 3.69 inches from 6:45 pm to 8:30 pm.

What these are

Heavy Rain: Rainfall totals unusual for the place and season that did not produce a flood.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in Florida in 2020 Every state in 2020 This day in weather history Warnings in Florida, September 2020

Sources

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: 921546.