Thursday, April26, 2018

Marine Weather and Tides
Lake Havasu City, AZ

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
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.

Sunrise 5:51AMSunset 7:18PM Wednesday April 25, 2018 11:02 PM MST (06:02 UTC) Moonrise 3:06PMMoonset 3:35AM Illumination 83% Phase: Waxing Gibbous; Moon at 11 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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7 Day Forecast for Marine Location Near Lake Havasu City, AZ
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location: 34.48, -114.34     debug

Area Discussion for - Las Vegas, NV
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Fxus65 kvef 252224 cca
area forecast discussion
national weather service las vegas nv
322 pm pdt Wed apr 25 2018

Synopsis Dry and unseasonably warm weather will continue across
the area through Friday. An area of low pressure is expected to
bring increasing winds and cooler temperatures to the region heading
into the weekend with high temperatures around normal forecast by

Short term Through Friday night...

a ridge over the western us will keep temperatures well above normal
through Friday. Forecast temperatures suggest Thursday will be the
warmest so far this year and many observing sites will flirt with
record high temps (see climate section below). It's worth noting
that las vegas has never recorded a triple digit temperature in
april; the best chance to hit the 100 degree mark will be
Thursday, though chances are slim. Temperatures will drop 3-6
degrees on Friday as a slow moving cutoff upper low moves inland
into norcal and heights aloft fall.

Most areas will remain dry through Friday, the exception will be the
south sierra. On Thursday, the cutoff in the eastern pacific will
begin to track east, which will put the sierra will be under
diffluent flow aloft. Low level moisture and diurnal heating
should lead to destabilization during the afternoon. Instability
along with synoptic lift should promote a few thunderstorms along
the western sierra; some of these tstorms may drift over the
ridge and make it to the eastern sierra slopes during the
afternoon Thursday. Have increased pops and added thunderstorm
chances along the south sierra to account for this. Forcing will
slack off over the sierra Friday and dry conditions are
anticipated areawide.

Winds will be generally light until Friday when the incoming low
will begin tighten surface gradients enough to promote breezy to
windy south winds across the region, especially the western mojave
desert where gusts between 30-40 mph are likely.

Long term Saturday through Wednesday.

A change to increasing winds and a cooling trend is still on track
this weekend through early next week as a broad pacific closed low
moves inland Saturday with its center over northern california and
northern nevada. The medium range models still indicate it will be a
generally minor impact system for our area with considerable
differences in details especially Monday through the middle of next
week. There is good agreement that a shortwave rounding the base of
the low will brush central southern nevada Saturday stirring up
southwest winds with widespread gusts of 25-35 mph by Saturday
afternoon. A typical enhanced belt of west to southwest winds across
san bernardino county up through southern clark and mohave counties
could result in fairly extensive gusts over 40 mph Saturday
afternoon. Northwest winds then push down through the region
Saturday night and Sunday morning behind the ejecting shortwave.

This will lead to temperatures pulling back near normal by Sunday
with winds generally less than 20 mph across much of the region.

Model agreement after Sunday is low with the GFS depicting a
shortwave dropping down from western canada and spinning up a closed
low over our region Monday and Tuesday then lifting it over the four
corners Wednesday. The ECMWF indicates a generally zonal flow for
our forecast area Monday and Tuesday with the low over the northern
intermountain region then spins a closed low up over southern nevada
for the middle of next week. In either case, the most noticeable
effect will be near or slightly below normal temperatures. Any
precipitation chances will be favored over the southern sierra and
central nevada.

Fire weather Calm conditions are expected to continue until
Friday. An incoming low pressure system will enhance winds across
the southern great basin and mojave desert on Friday and through the
weekend. Wind gusts of 25-35 mph, minimum rh values below 10
percent, and critical fuels will combine to create critical fire
weather conditions over the weekend.

Climate Very warm temperatures are expected Thursday (april 26)
and many observing sites will approach record values. The record
high temperature, the most recent year that it occurred, and the
forecast high for las vegas, bishop, kingman and death valley are
listed below.

**site** **record year** **fcst high**
las vegas 97 1996 96
bishop 90 2000 87
kingman 94 1927 92
death valley 110 1996 107

Aviation For mccarran... Light easterly winds expected through the
remainder of the afternoon with winds turning more southwest after
sunset. Speeds will generally remain 7 kts or less. Light northeast
winds are expected once again after 18z Thursday with speeds
remaining under 7 kts. Only few-sct high clouds through Thursday

For the rest of southern nevada, northwest arizona and southeast
california... Generally light winds under 10 knots across the area
through mid day Thursday with occasional high clouds. South to
southwest winds will increase to around 10-15 kts over mainly san
bernardino county Thursday afternoon.

Spotter information statement Spotters are encouraged to report
any significant weather or impacts according to standard operating

Short term fire weather climate... Boothe
long term... Adair
aviation... Gorelow
for more forecast information... See us on our webpage:
http: weather.Gov lasvegas or follow us on facebook and twitter

Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Needles, Needles Airport, CA25 mi67 minWSW 1310.00 miFair92°F16°F6%1006.9 hPa

Wind History from EED (wind in knots)
Last 24hrSW11W5SW6W8NW7NW8N4CalmW5N4N9
1 day agoSW8NE4W7CalmW11W43CalmW5NW3NE3NE5N3NE7333
2 days agoSW10CalmNW7SW10S4W7W3W5W6NE3CalmE3CalmSE9S8

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map and Satellite Images
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GOES Local Image of Southwest    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Las Vegas, NV (2,6,7,8)
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Ground Weather Radar Station Las Vegas, NV
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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.