Marine Weather and Tides
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.
|Sunrise 5:44AM||Sunset 7:42PM||Thursday July 29, 2021 2:38 PM MST (21:38 UTC)||Moonrise 11:21PM||Moonset 11:23AM||Illumination 70%|
7 Day Forecast for Marine Location Near Lake Havasu City, AZHourly EDIT Help
Area Discussion for - Las Vegas, NV  (on/off)  Help NOTE: mouseover dotted underlined text for definition
FXUS65 KVEF 291721 CCA AFDVEF
Area Forecast Discussion National Weather Service Las Vegas NV 1022 AM PDT Thu Jul 29 2021
SYNOPSIS. Monsoonal moisture will spread back into our region tonight and Friday leading to an increasing threat of thunderstorms with heavy rain this weekend. A dry southwest flow developing late Sunday and Monday will push the moisture away and provide a dry pattern much of next week.
MORNING UPDATE. Forecast grids capture the latest 12Z HREF areas and timing for convection today. PWATs are climbing as expected across southern Arizona and into the Colorado River Valley with a well defined swath of moisture evident on mid-level WV imagery. Expected CI to take place very soon after 18Z primarily over high terrain areas first then evolving as the afternoon progresses. DCAPE values this morning are 1200+ J/KG for southern Nevada and northwest Arizona so strong outflow winds looks like the main concern, as well as isolated flash flooding with any slow moving storms.
SHORT TERM. Today through Saturday.
A substantial moisture increase is still on the way across our entire region Friday and Saturday ahead of an easterly wave working its way from west Texas to southwest Arizona by early Friday morning. The 00Z HREF indicates convection will develop over the high terrain of central Arizona this afternoon then move to the west- northwest into Mohave County this evening. Scattered showers and isolated thunderstorms will then push into eastern San Bernardino County along with Clark and southern Lincoln counties late tonight and Friday morning. Precipitable water values of 1.5-1.75" and surface dewpoints will spread back into areas from Clark County southward and values of 1.25-1.5" will work there way up across Inyo County and central Nevada . providing plenty of fuel for showers and thunderstorms across most of our forecast area. A persistent southeast to southerly flow will remain over our area through Saturday between high pressure over the central plains and a trough off the California Coast. There will be considerable cloud cover Friday and Saturday which limit surface heating and it is a little unclear how much upward forcing the easterly wave will provide as it loses definition as it is entrained in the channeled flow and pulled over our area. It may be that Saturday ends up being the more active day as the California Coast trough begins moving inland and increases mid level convergence. In any case, the abundant moisture will resulting in scattered to numerous showers and thunderstorms and the potential for heavy rain with some storms. While details are still unclear on timing and potential areas of heavy rainfall, the threat will be increasing across much of the region Friday and Saturday. High temperatures will also be dropping about 10 degrees after today with the moisture increase and additional cloud cover.
LONG TERM. Next Week. A chance in pattern over the long term looks to be on the horizon as a reprieve from anomalous moisture takes shape in the long range ensembles. PWAT anomalies actually swing to below average, in both the EC and GEFS by early next week with high pressure solidly in place over southern California. This would allow for temperatures to rise back to around normal values and give a break to the region that has seen an extended period of monsoonal thunderstorms. However, moisture gradually increases late week and by next weekend, precip chances may return to the CWA.
AVIATION. For McCarran . Scattered convection is possible this afternoon through at least the late evening. Expecting more coverage than yesterday, with potential thunderstorms around the terminals by around 20Z. There is a slight chance for storms to enter the valley, especially after 03Z tonight. CIGs down to 8000ft are possible with any precipitation. Sudden and erratic winds are possible with any nearby storms as well, especially this evening and early tonight. At least scattered showers and/or thunderstorms may last through the night, but low confidence on any precipitation past 09Z at this time.
Outside of any convective influence, expecting light diurnal winds through the period. Low confidence in the wind forecast after 09Z as wind direction and speed may depend on how thunderstorms impact the valley. Looking ahead, periods of storms are expected Friday into Saturday with heavy rain, CIGs around 7000ft, and sudden gusty winds possible at times.
For the rest of southern Nevada, northwest Arizona and southeast California . There is a chance for scattered convection this afternoon across the area, with more storms expected than yesterday. Best chance for storms to impact a TAF site will again be BIH this afternoon through early this evening, with CIGs down to 7000ft if storms move over the terminal. Thunderstorms this afternoon could contain sudden gusty outflow winds. Low confidence that a outflow will impact the Colorado River Valley sometime 00Z-06Z, including EED and IFP, likely out of the east or southeast.
Expecting typical typical wind patterns across the region outside of any convective influence. Occasional CIGS 10kft-20kft are expected, with increasing clouds late this afternoon and overnight. Thunderstorm chances increase across the region again Friday through Saturday, with convective impacts possible including heavy rain, low CIGs down to 5000-7000ft, and sudden strong winds.
SPOTTER INFORMATION STATEMENT. Spotters are encouraged to report any significant weather or impacts according to standard operating procedures.
SHORT TERM . Adair UPDATE/LONG TERM . TB3 AVIATION . Nickerson
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|Needles, Needles Airport, CA||25 mi||43 min||ENE 5||10.00 mi||Mostly Cloudy||108°F||51°F||15%||1004 hPa|
Link to 5 minute data for KEED
Wind History from EED (wind in knots)
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|2 days ago||SE||S|
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