Public Information Statement
Issued by NWS Melbourne, FL

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NOUS42 KMLB 021955 CCA
PNSMLB
FLZ041-044>047-053-054-058-059-064-141-144-147-031200-

Public Information Statement
National Weather Service Melbourne FL
355 PM EDT Mon Oct 2 2017

...September 2017 Was One of the Wettest on Record Due to Rainfall
from Hurricane Irma...

September 2017 will be well known for major Hurricane Irma that
crossed the Florida Keys and then made landfall as a Category 3
hurricane along the southwest Florida coast during the afternoon of
the 10th. As Irma moved northward along the west side of the
peninsula through the early morning of the 11th it produced record
rainfall, significant flooding, widespread damaging winds, and
numerous tornadoes across east central Florida.

The widespread, very heavy precipitation from Irma largely
contributed to totals that were well above normal for the month,
with several sites ranking within the top five wettest on record for
September. The cloudy and wet conditions from Irma produced slightly
below normal temperatures, but otherwise daily average temperatures
were often above normal for the month.


...Temperatures...

With no cold frontal passages during September, temperatures
generally remained near to above normal most days. Highs along the
coast were often in the upper 80s to around 90 degrees and inland
locations typically reached the low 90s, with lows ranging from the
low to mid 70s. Increased cloud cover and heavy precipitation with
Hurricane Irma on the 10th produced the lowest high temperatures
during the month, with values only reaching the upper 70s to low 80s
across the region.

Much like the summer, average minimum temperatures for the month
showed a larger departure from normal than average highs, with
values ending up around one to two degrees above normal. Average
maximum temperatures for September were typically around a half of a
degree to a degree above normal. The overall result led to average
temperatures for the month that ranged from near normal at Orlando,
up to 1.8 degrees warmer than normal at Melbourne. In fact,
Melbourne tied its record for warmest September, previously reached
in 2007, with an average temperature of 82.4.


Daily Record Temperatures for the Month:

Daytona Beach:
- September 1st: Record high of 95 degrees. Previous record was 94
degrees last set in 2000.
- September 24th: Record warm low of 78 degrees. Previous record was
77 last set in 1998.

Sanford:
- September 24th: Tied a record warm low of 76 degrees, last set in
2002.

Melbourne:
- September 16th: Tied a record warm low of 80 degrees, last set in
2010.

Vero Beach:
- September 1st: Tied a record high of 94 degrees, last set in 1989.


Average temperature values for September 2017 at the six primary
climate sites across east central Florida are as follows (rankings
provided if in the top 10):

- Daytona Beach had a monthly average temperature of 80.8 degrees
Fahrenheit, which was 1.3 degrees above normal. This ties 2016,
2005, 1991, 1973, and 1931 for having the 7th warmest average
temperature for September on record for this site, with records
extending back to 1923.

- Sanford had a monthly average temperature of 81.6 degrees
Fahrenheit, which was 0.7 degrees above normal. This ties 2004 for
having the 5th warmest average temperature for September on record
for this site, with records extending back to 1948.

- Orlando had a monthly average temperature of 81.0 degrees
Fahrenheit, which was 0.1 degrees below normal.

- Melbourne had a monthly average temperature of 82.4 degrees
Fahrenheit, which was 1.8 degrees above normal. This ranks as the
warmest average temperature for the month of September, tying
September 2007, with records extending back to 1937.

- Vero Beach had a monthly average temperature of 81.2 degrees
Fahrenheit, which was 0.6 degrees above normal.

- Fort Pierce had a monthly average temperature of 81.2 degrees
Fahrenheit, which was 0.6 degrees above normal.


...Rainfall...

Scattered afternoon showers and storms, typical of the wet season,
occurred each day to begin September, with locally heavy rainfall
between 3 to 5 inches across Brevard County on the 2nd, leading to a
new daily rainfall record at Melbourne. A weak front moved into
Florida on the 7th and lingered across the area ahead of Hurricane
Irma, increasing shower and storm coverage across northern portions
of east central Florida on the 8th and 9th.

Heavy rain bands from Irma then covered the region into the 10th as
it lifted northward across the western Florida peninsula, producing
widespread torrential rainfall amounts through early on the 11th.
Total rain amounts from Irma were in the range of 7 to 12 inches for
most areas in east central Florida, with locally heavy rainfall
amounts up to 15 to 21 inches in the Fort Pierce area. The actual
highest observed rainfall total from Irma was 21.66 inches at the
Fort Pierce Water Plant. Daily rainfall records were easily smashed
at all primary climate sites on the 10th, and in fact Sanford,
Melbourne and Fort Pierce set new all-time daily maximum rainfall
records!

Periods of lower shower and storm coverage occurred with drier air
that built in behind Irma and in northerly flow well west of
Hurricane Maria later in the month. However, deeper moisture
associated with a weak frontal boundary on the 22nd and 23rd, as
well as with an inverted trough and weak low that moved northward
into central Florida at the end of the month, brought brief periods
of increased rainfall across the region.

The heavy precipitation from Irma alone accounted for 60 to 80
percent of rainfall for the month, and therefore was largely
responsible for totals that were well above normal. Observed amounts
across much of the region in September were around 10 to 15 inches,
with locally higher amounts of 20 to 25 inches in some spots. These
values were 5 to 8 inches above normal, or even higher in some
locations for the month. For several sites, rainfall totals reached
within their top 5 wettest for September. Most notable was Melbourne
which set their wettest September on record with 20.94 inches for
the month, and came in just 0.13 inches shy of setting their all
time monthly rainfall record, which still stands at 21.06 inches
from August of 2008.


Daily Record Rainfall for the Month:

Daytona Beach:
- September 10th: Record daily rainfall of 4.10 inches. Previous
record was 2.42 inches last set in 1964.

Sanford:
- September 10th: Record daily rainfall of 9.24 inches. Previous
record was 5.13 inches last set in 1964. This is also the all-time
daily maximum rainfall amount ever recorded for this site, with
records extending back to 1948.

Orlando:
- September 10th: Record daily rainfall of 6.61 inches. Previous
record was 3.63 inches last set in 1928.

Melbourne:
- September 2nd: Record daily rainfall of 4.62 inches. Previous
record was 2.35 inches last set in 1977.
- September 10th: Record daily rainfall of 10.23 inches. Previous
record was 1.23 inches last set in 1992. This is also the all-time
daily maximum rainfall amount ever recorded for this site, with
records extending back to 1937.

Vero Beach:
- September 10th: Record daily rainfall of 6.06 inches. Previous
record was 3.17 inches last set in 1966.

Fort Pierce:
- September 10th: Record daily rainfall of 13.08 inches. Previous
record was 1.63 inches last set in 1960. This is also the all-time
daily maximum rainfall amount ever recorded for this site, with
records extending back to 1901.


September 2017 rainfall totals for the six primary climate sites
across east central Florida are as follows (ranking provided if in
the top 10):

- Daytona Beach received 9.68 inches of rain for the month, which
was 2.72 inches above normal.

- Sanford received 11.81 inches of rain for the month, which was
5.63 inches above normal. This ranks as the 6th wettest September on
record for this site, with records going back to 1948.

- Orlando received 14.09 inches of rain for the month, which was
8.03 inches above normal. This ranks as the 4th wettest September on
record for this site, with records going back to 1892.

- Melbourne received 20.94 inches of rain for the month, which was
13.30 inches above normal. This ranks as the wettest September on
record, breaking the previous record of 19.68 inches set in
September of 1948. Records for this site go back to 1937.

- Vero Beach received 10.39 inches of rain for the month, which was
3.60 inches above normal.

- Fort Pierce received 17.86 inches of rain for the month, which was
10.56 inches above normal. This ranks as the 2nd wettest September
on record for this site, with records going back to 1901.


Co-operative Observer Station Rainfall Rankings:
- Clermont had 13.20 inches of rain for the month, which ranks as the
4th wettest September on record for this site, with records going
back to 1948.
- Titusville had 16.03 inches of rain for the month, which ties 1929
as the 6th wettest September on record for this site, with records
going back to 1901.
- Fort Pierce Water Plant had 25.71 inches of rain for the month,
which ranks as the wettest September on record for this site. This
breaks the previous record of 19.90 inches in September 1963, with
records going back to 1901.
- Stuart had 15.70 inches of rain for the month, which ranks as the
4th wettest September on record for this site, with records going
back to 1935.

Below is a list of observed precipitation totals and rainfall
statistics for select sites across east central Florida for September
2017:

Station      September 2017     Normal      Departure    Percent of
                Rainfall       Rainfall    From Normal     Normal

Daytona Beach     9.68"          6.96"       +2.72"         139%
(DAB)
Orlando          14.09"          6.06"       +8.03"         233%
(MCO)
Melbourne        20.94"          7.64"      +13.30"         274%
(MLB)
Vero Beach       10.39"          6.79"       +3.60"         153%
(VRB)
Clermont         13.20"          5.09"       +8.11"         259%
(CLRF1)
Leesburg         10.82"          6.15"       +4.67"         176%
(LEE)
Sanford          11.81"          6.18"       +5.63"         191%
(SFB)
Titusville       16.03"          7.07"       +8.96"         227%
(TITF1)
Fort Pierce      17.86"          7.30"      +10.56"         245%
(FPR)
Stuart           15.70"          8.91"       +6.79"         176%
(STRF1)

For more local climate information, please visit our web page at
http://weather.gov/mlb and click on the "Climate" icon toward the
bottom of the page.

$$

Weitlich


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