Saturday, August19, 2017

Marine Weather and Tides
Siesta Key, FL

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 7:02AMSunset 8:04PM Saturday August 19, 2017 2:40 PM EDT (18:40 UTC) Moonrise 3:43AMMoonset 5:32PM Illumination 7% Phase: Waning Crescent; Moon at 27 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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GMZ853 Coastal Waters From Englewood To Tarpon Springs Fl Out 20 Nm- 956 Am Edt Sat Aug 19 2017
This afternoon..North winds around 5 knots then becoming northwest around 10 knots in the afternoon. Seas 2 feet or less. Bay and inland waters a light chop. Isolated Thunderstorms.
Tonight..Northwest winds around 10 knots then becoming northeast after midnight. Seas 2 feet or less. Bay and inland waters a light chop.
Sunday..East winds around 10 knots. Seas 2 feet or less. Bay and inland waters a light chop. Isolated Thunderstorms.
Sunday night..East winds around 10 knots. Seas 2 feet or less. Bay and inland waters a light chop. Scattered Thunderstorms.
Monday..East winds around 10 knots. Seas 2 feet. Bay and inland waters a light chop. Isolated Thunderstorms.
Monday night..East winds around 15 knots. Seas 2 to 3 feet. Bay and inland waters a moderate chop. Isolated Thunderstorms.
Tuesday..Northeast winds around 10 knots. Seas 2 feet. Bay and inland waters a light chop. Isolated Thunderstorms.
Tuesday night..Northeast winds around 10 knots then becoming east after midnight. Seas 2 feet or less. Bay and inland waters a light chop. Isolated Thunderstorms.
Wednesday..Northeast winds around 10 knots. Seas 2 feet or less. Bay and inland waters a light chop. Scattered Thunderstorms.
GMZ800 Synopsis For The Coastal Waters From Bonita Beach To Suwannee River- 956 Am Edt Sat Aug 19 2017
Synopsis..Surface high pressure will remain across the region through the weekend with light winds and slight seas. Winds are expected to increase some with easterly surges early next week as the pressure gradient tightens a bit between low pressure to the south and high pressure to the north. Otherwise, the primary marine concern will be daily scattered Thunderstorms which may produce dangerous lightning, locally stronger winds, and choppy seas.

7 Day Forecast for Marine Location Near Siesta Key, FL
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location: 27.3, -82.57     debug

Area Discussion for - Tampa Bay, FL
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Fxus62 ktbw 191829
area forecast discussion
national weather service tampa bay ruskin fl
229 pm edt Sat aug 19 2017

Short term (tonight - Sunday)
In the mid upper levels, an upper level low over the eastern gulf of
mexico will continue moving westward toward texas through the
weekend. Mid-level ridging near bermuda extends west-southwest over
eastern florida. On the surface, subtropical high pressure near
bermuda ridges west-southwest over florida and into the gulf of
mexico. This will produce a predominant easterly wind flow over the
florida peninsula on Sunday. This will favor the development of
thunderstorms early in the afternoon along the east coast and late
evening along the west coast of florida as the storms move westward.

Temperatures will remain around seasonal averages with daytime highs
in the low 90's and overnight lows in the mid to upper 70's.

Long term (Sunday night - Saturday)
A tropical wave will be exiting to the west into the gulf of mexico
early on Monday. Lingering moisture associated with the wave along
with the sea breezes will support scattered showers and storms over
the region on Monday with pops in the 20 to 40 percent range.

Thereafter models show drier air over the atlantic advecting in over
the forecast area during Monday night and Tuesday in the wake of the
wave which will result in lower rain chances (pops 20 to 30 percent)
across the forecast area on Tuesday, especially across central zones
where the driest air will be most prevalent. Another tropical wave
will approach and move across the region and into the gulf during
Tuesday night into Wednesday. Increasing moisture (pw's increasing
to 2+ inches) associated with this wave will again increase rain
chances across the area during Wednesday and Thursday with scattered
to numerous showers and storms expected each day. The high moisture
content combined with slow moving storms will favor locally heavy
rainfall amounts in some locations.

During Thursday night into Friday an upper level trough and
attendant cold front to the north will push the surface ridge axis
to the south to lie across the southern peninsula. With ample
moisture remaining in place along with the sea breeze and troughing
aloft scattered to numerous showers and storms will continue through
the period. The onshore flow will favor late night and early morning
showers and storms along the coast with the convection then moving
to inland areas during the afternoon.

On Saturday the upper level trough axis will shift east into the
atlantic as upper level ridging noses in from the northwest as the
surface ridge axis lifts back to the north some with scattered to
numerous diurnal sea breeze driven showers and storms expected
during the afternoon. It will remain very warm and muggy with
temperatures running some 3 to 5 degrees above normal through the
period. Overnight low temperatures will range from the mid 70s
inland areas, to the upper 70s to around 80s along the coast, while
daytime highs will climb into the lower 90s along the coast, and mid
to upper 90s inland with the high humidity levels supporting heat
indices in the 100 to 105 degree range each afternoon.

Vfr conditions can be expected through much of the day with drier
mid to upper levels. Will cover any isolated storms with vcts this
afternoon with localized and brief restrictions possible from 18z-
21z. No other aviation impacts expected.

High pressure in the gulf of mexico will influence the weather over
the coastal waters tonight and into early Sunday. Winds will remain
light out of the north tonight, then veering to the east on Sunday
afternoon as high pressure near bermuda ridges west over the region.

This will be the dominant weather feature through the period. With
the easterly flow, showers and storms will be more common later
evening and into the early morning hours each day. The main hazard
will be dangerous lightning, locally higher winds and choppy seas
near thunderstorms.

Fire weather
Abundant moisture combined with daily rain chances will keep
humidity levels above critical levels through early next week with
no fire weather issues expected.

Preliminary point temps pops
Tpa 80 93 78 93 10 50 20 30
fmy 77 90 77 95 10 60 30 20
gif 76 92 76 94 20 50 20 30
srq 77 92 77 93 10 60 30 20
bkv 74 93 76 94 10 50 20 30
spg 80 92 79 93 10 60 20 30

Tbw watches warnings advisories
Fl... None.

Gulf waters... None.

Short term aviation marine fire weather... 74 wynn
mid term long term decision support... 57 mcmichael

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
VENF1 - Venice, FL 17 mi40 min WNW 8.9 G 9.9 87°F 90°F1015.8 hPa (-0.7)75°F
42013 - C10 - Navy-2 21 mi70 min ENE 1.9 G 3.9 90°F
PMAF1 23 mi40 min 86°F 93°F1015.2 hPa (-0.5)
MTBF1 25 mi40 min WNW 6 G 7 86°F 1016 hPa (-0.7)
42098 28 mi70 min 91°F1 ft
CLBF1 31 mi106 min WSW 6 G 8 87°F 1015.3 hPa
SAPF1 - 8726520 - St. Petersburg, FL 32 mi40 min SE 2.9 G 5.1 89°F 89°F1016.2 hPa (-0.6)
OPTF1 - 8726607 - Old Port Tampa, FL 39 mi40 min W 5.1 G 6 87°F 89°F1016 hPa (-0.6)
MCYF1 43 mi40 min 89°F
TSHF1 - 8726667 - East Bay Causeway, FL 44 mi46 min WSW 5.1 G 8
TPAF1 - 8726694 - TPA Cruise Terminal 2, Tampa, FL 44 mi52 min WSW 4.1 G 7
CWBF1 - 8726724 - Clearwater Beach, FL 49 mi40 min NNW 8 G 9.9 86°F 89°F1016.2 hPa (-0.3)

Wind History for C-Cut, FL
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1 day
2 days

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Sarasota / Bradenton, Sarasota-Bradenton International Airport, FL7 mi47 minWNW 810.00 miMostly Cloudy90°F75°F62%1015.2 hPa
Venice Municipal Airport, FL17 mi45 minWNW 1110.00 miA Few Clouds90°F75°F63%1015.9 hPa

Wind History from SRQ (wind in knots)
Last 24hrW8NW5NW10NW12N8N5N9S9E3CalmSE7SE5SE3CalmSE5CalmCalmCalmE3Calm4W5W8W8
1 day agoE14W4NW5NW7NW4NE4E7E10SE7CalmE6CalmSE4CalmSE3SE3E3E4E3Calm4S4SW9W9
2 days agoNE8NW6W6N6N4N3CalmE4SE5SE5E3SE4SE3SE3E4CalmE4CalmSE3NE3Calm4W9NW14

Tide / Current Tables for Sarasota, Sarasota Bay, Florida
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Sat -- 12:49 AM EDT     1.53 feet High Tide
Sat -- 04:42 AM EDT     Moonrise
Sat -- 04:49 AM EDT     1.34 feet Low Tide
Sat -- 07:03 AM EDT     Sunrise
Sat -- 10:43 AM EDT     2.54 feet High Tide
Sat -- 06:31 PM EDT     Moonset
Sat -- 07:08 PM EDT     -0.00 feet Low Tide
Sat -- 08:03 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Tide / Current Tables for Tampa Bay (Sunshine Skyway Bridge), Florida Current
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Tampa Bay (Sunshine Skyway Bridge)
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Sat -- 03:37 AM EDT     -0.00 knots Slack
Sat -- 04:42 AM EDT     Moonrise
Sat -- 04:44 AM EDT     -0.15 knots Max Ebb
Sat -- 05:54 AM EDT     0.00 knots Slack
Sat -- 07:03 AM EDT     Sunrise
Sat -- 09:59 AM EDT     1.23 knots Max Flood
Sat -- 12:59 PM EDT     -0.00 knots Slack
Sat -- 05:10 PM EDT     -1.84 knots Max Ebb
Sat -- 06:32 PM EDT     Moonset
Sat -- 08:04 PM EDT     Sunset
Sat -- 08:54 PM EDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Weather Map and Satellite Images
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Weather Map
IR Satellite Image from GEOS

GOES Local Image of Southeast    EDIT

Wind Forecast for Tampa Bay, FL (14,3,4,5)
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Ground Weather Radar Station Tampa Bay Area, FL
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weather_mapweather_map weather_map

Gulf Stream Current

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The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerious of sources and is presented automatically. It is not checked for accuracy either by anyone at or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.