Thursday, July20, 2017 L-36.com


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 6:46AMSunset 8:26PM Thursday July 20, 2017 6:37 PM EDT (22:37 UTC) Moonrise 2:57AMMoonset 4:47PM Illumination 8% 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- 252 Pm Edt Thu Jul 20 2017
Tonight..West winds around 5 knots then becoming south in the late evening and overnight. Seas 2 feet or less. Bay and inland waters smooth. Isolated Thunderstorms.
Friday..South winds around 5 knots then becoming southwest in the afternoon. Seas 2 feet or less. Bay and inland waters smooth. Scattered Thunderstorms in the morning, then isolated Thunderstorms in the afternoon.
Friday night..South winds around 5 knots. Seas 2 feet or less. Bay and inland waters smooth. Isolated Thunderstorms after midnight.
Saturday..Southwest winds around 5 knots. Seas 2 feet or less. Bay and inland waters smooth. Scattered Thunderstorms in the morning, then isolated Thunderstorms in the afternoon.
Saturday night..Southwest winds around 10 knots diminishing to around 5 knots after midnight. Seas 2 feet or less. Bay and inland waters a light chop. Isolated Thunderstorms.
Sunday..Southwest winds around 5 knots. Seas 2 feet or less. Bay and inland waters smooth. Scattered Thunderstorms.
Sunday night..Southwest winds around 5 knots. Seas 2 feet or less. Bay and inland waters smooth. Isolated Thunderstorms.
Monday..Southwest winds around 5 knots. Seas 2 feet or less. Bay and inland waters smooth. Scattered Thunderstorms.
Monday night..West winds around 5 knots then becoming northwest toward morning. Seas 2 feet or less. Bay and inland waters smooth. Isolated Thunderstorms.
Tuesday..North winds around 5 knots then becoming west in the afternoon. Seas 2 feet or less. Bay and inland waters smooth. Isolated Thunderstorms in the morning, then scattered Thunderstorms in the afternoon.
GMZ800 Synopsis For The Coastal Waters From Bonita Beach To Suwannee River- 252 Pm Edt Thu Jul 20 2017
Synopsis..Surface high pressure will meander about the south central florida peninsula and eastern gulf through early next week. A weak pressure pattern will keep winds generally less than 10 knots and seas less than 2 feet through the period. Wind and seas will be higher in the vicinity of Thunderstorms each day during the late night and early morning hours, otherwise no marine headlines are expected.

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 201831
afdtbw
area forecast discussion
national weather service tampa bay ruskin fl
231 pm edt Thu jul 20 2017

Short term (tonight - Friday)
Ample moisture and instability combined with the sea breeze
and outflow boundary interactions will continue to support
shower and thunderstorm development across the forecast
area the reminder of the afternoon. As mentioned in the
morning discussion cooling mid level temperatures associated
with a mid level cut-off low offshore the southeast u.S.

Coast may lead to a few strong to low end severe storms with
some strong downburst winds and hail possible. Frequent
lightning strikes and locally heavy rains will also
accompany the storms. The showers and storms will move to
the east and northeast toward inland locations within the
weak southwest to west steering flow where the greatest
storm coverage is expected, but with such a light flow can
not rule out some storms redeveloping back toward the coast
along outflow boundaries during the late afternoon and early
evening hours as well. The showers and storms will
gradually wind down by mid evening as boundary interactions
weaken and loss of daytime heating occurs with mainly dry
conditions expected overnight with the convective debris
cloudiness thinning with skies becoming partly cloudy toward
morning.

On Friday the mid level cut-off low off will retrograde
west southwest across the northern florida peninsula and
panhandle during the day. As this feature moves to the west
southwest surface high pressure from the atlantic extending
west across the southern peninsula will remain in place with
a light southwest to west wind flow continuing across the
forecast area. This flow regime will continue to favor late
night and early morning showers and storm over the coastal
waters that will move onshore during Friday morning into
early afternoon, with additional showers and storms then
developing along the sea breeze circulations over inland
locations during the afternoon and early evening hours where
the highest rain chances and greatest storm coverage is
again expected. Similar to today locally heavy rains, strong
gusty winds, frequent lightning strikes, and some hail will
be possible with the storms. Temperatures will continue to
run a few degrees above normal with lows tonight in the mid
70s inland areas, and upper 70s to around 80 along the
coast, with highs on Friday in the lower to mid 90s.

Long term (Friday night - Thursday)
The western periphery of high pressure aloft over the western
atlantic will remain over the florida peninsula through the
weekend and into next week. At the surface, the ridge axis
will remain generally across the central florida peninsula,
keeping a mainly light and variable flow across the region
until the sea breeze initiates each afternoon. This overall
pattern suggests morning and early afternoon showers and
thunderstorms over the coastal waters (with some moving over
land), with activity then shifting inland later in the
afternoon and into the evening and likely increasing in
coverage as the east coast sea breeze meets its counterpart.

As with other light flow days, some of these showers and
storms are likely to move back toward the west coast as
outflow boundaries spark additional convection. Overall, the
next week will be a continuation of summer.

Aviation
Scattered showers and thunderstorms may bring brief MVFR ifr
conditions to the terminal sites through 02z tonight and
have handled with vcts and brief tempo groups, otherwiseVFR
will prevail. Developing shra tsra over the gulf waters
late tonight may again bring some additional brief MVFR ifr
conditions to the coastal sites after 13z Friday morning
otherwiseVFR will continue. Southwest to west wind in the 5
to 10 knot range this afternoon with higher gusts in the
vicinity of tsra will become light and variable after 02z
tonight. Southwest winds at 5 to 7 knots are expected after
15z on Friday as the bay and sea breeze redevelops.

Marine
Surface high pressure will meander about the south-central
florida peninsula tonight through early next week with
light winds and slight seas continuing over the gulf waters
with a weak pressure pattern supporting an onshore sea
breeze component developing along the coast each afternoon.

The main marine hazards will be higher wind and seas in the
vicinity of the thunderstorms each day, otherwise no marine
headlines are anticipated.

Fire weather
Ample low level moisture and daily rain chances will keep
humidity values well above critical levels through the
upcoming weekend with no fire weather issues expected.

Preliminary point temps pops
Tpa 78 91 79 90 30 30 20 40
fmy 76 93 76 91 20 30 10 40
gif 75 93 75 92 30 60 20 50
srq 77 90 77 89 30 20 20 30
bkv 73 92 74 91 30 50 20 40
spg 79 90 79 90 30 20 20 30

Tbw watches warnings advisories
Fl... None.

Gulf waters... None.

Short term aviation marine fire weather... 57 mcmichael
long term decision support... 05 carlisle


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
VENF1 - Venice, FL 17 mi38 min WSW 6 G 7 88°F 91°F1016.6 hPa (-1.9)77°F
42013 - C10 - Navy-2 21 mi68 min NW 5.8 G 7.8 88°F
PMAF1 23 mi50 min 86°F 92°F1015.7 hPa
MTBF1 25 mi50 min WNW 7 G 8.9 86°F 1016.6 hPa
CLBF1 31 mi104 min W 8 G 9.9 87°F 1016 hPa
SAPF1 - 8726520 - St. Petersburg, FL 32 mi56 min WSW 6 G 8.9 88°F 88°F1016.6 hPa
OPTF1 - 8726607 - Old Port Tampa, FL 39 mi50 min NW 4.1 G 6 84°F 88°F1016.6 hPa
MCYF1 43 mi50 min 91°F
TSHF1 - 8726667 - East Bay Causeway, FL 44 mi56 min N 7 G 9.9
TPAF1 - 8726694 - TPA Cruise Terminal 2, Tampa, FL 44 mi62 min N 4.1 G 8
CWBF1 - 8726724 - Clearwater Beach, FL 49 mi50 min WNW 6 G 8 87°F 89°F1016.8 hPa

Wind History for C-Cut, FL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Sarasota / Bradenton, Sarasota-Bradenton International Airport, FL7 mi45 minW 1010.00 miThunderstorm in Vicinity89°F75°F63%1015.7 hPa
Venice Municipal Airport, FL17 mi43 minVar 410.00 miFair90°F77°F67%1016.6 hPa

Wind History from SRQ (wind in knots)
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Last 24hrE4CalmE3E7E6SE5SE6SE4E4E5E5SE3CalmCalmCalmSW33S3SW3N9W5SW6W7W10
1 day agoE8E3SE4SE5SE6SE4E4SE4E3E4E5E3CalmE3E3SE3SW5W5SW6SW76W7W8SE12
G18
2 days agoCalmE4E6E5E8E5SE6SE6SE6SE4SE5--CalmSE5SE8SE6W8NE5S4N3N3W3W5W6

Tide / Current Tables for Sarasota, Sarasota Bay, Florida
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Sarasota
Click for Map
Thu -- 03:51 AM EDT     1.18 feet Low Tide
Thu -- 03:56 AM EDT     Moonrise
Thu -- 06:47 AM EDT     Sunrise
Thu -- 09:49 AM EDT     2.44 feet High Tide
Thu -- 05:47 PM EDT     Moonset
Thu -- 06:29 PM EDT     -0.12 feet Low Tide
Thu -- 08:25 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.41.31.31.21.21.31.51.82.12.42.42.32.11.71.30.80.40.1-0.1-0.10.10.50.81.1

Tide / Current Tables for Tampa Bay (Sunshine Skyway Bridge), Florida Current
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Tampa Bay (Sunshine Skyway Bridge)
Click for Map
Thu -- 03:02 AM EDT     -0.00 knots Slack
Thu -- 03:44 AM EDT     -0.06 knots Max Ebb
Thu -- 03:56 AM EDT     Moonrise
Thu -- 04:27 AM EDT     0.00 knots Slack
Thu -- 06:47 AM EDT     Sunrise
Thu -- 09:00 AM EDT     1.26 knots Max Flood
Thu -- 12:07 PM EDT     -0.00 knots Slack
Thu -- 04:17 PM EDT     -1.81 knots Max Ebb
Thu -- 05:48 PM EDT     Moonset
Thu -- 08:20 PM EDT     0.00 knots Slack
Thu -- 08:26 PM EDT     Sunset
Thu -- 11:31 PM EDT     1.56 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.10.70.30-00.10.40.81.11.31.10.70.1-0.6-1.2-1.6-1.8-1.8-1.5-1-0.30.51.11.5

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

GOES Local Image of Southeast    EDIT
Geos

Wind Forecast for Tampa Bay, FL (18,4,5,8)
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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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Disclaimer:
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 L-36.com. 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 L-36.com 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.