Marine Weather and Tides
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
|Sunrise 7:41AM||Sunset 5:54PM||Monday January 18, 2021 6:57 PM MST (01:57 UTC)||Moonrise 11:20AM||Moonset 11:33PM||Illumination 31%|
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 182055 AFDVEF
Area Forecast Discussion National Weather Service Las Vegas NV 1255 PM PST Mon Jan 18 2021
SYNOPSIS. Two weather systems coming together will spin up a large low pressure system off the southern California coast late this afternoon into Wednesday. This will produce gusty winds and chances for light precipitation south of the I-40 corridor. A potentially stronger, colder storm system could reach the area going into next weekend.
SHORT TERM. Today through Wednesday.
BOTTOM LINE UP FRONT: The weather pattern will become more unsettled across the southwest this week. The first set of weather systems moving through today-Tuesday will bring winds to the region, with only light precipitation and increased cloud cover mainly impacting areas south of the I-40 corridor.
SYNOPTIC PATTERN: The shortwave currently digging into Idaho and northeast NV will continue to deepen and dig south across the Great Basin today. Simultaneously, the shortwave currently off the southern CA coast will continue to dig further southwest off the northern Baja coast. Overnight tonight, the more potent shortwave digging into NV will close off over our region, bringing a stout NE-SW oriented upper-level jet across west-central NV and the central Sierra. The closed low overhead will continue to dig southwest Tuesday where it will interact and undergo the Fujiwhara effect with the aforementioned low off the CA Baja coast, becoming a singular closed low by Tuesday night. This low will continue to spin off the northern Baja coast (near 120W, 30N) and gradually weaken through Wednesday.
WHAT'S CHANGED: The drying tread continues with this early week system, resulting in further decreased chances for precipitation Tuesday for areas south of the I-40 corridor. Additionally, wind magnitudes seem to have decreased a tad from 24 hours ago for the NE winds Tuesday as well, further limiting wind impacts to only isolated NE wind-prone locations. Slight chances for light precipitation was extended through much of Wednesday for areas south of the I-40 corridor, but little to no impacts expected since precipitation will be very light.
EXPECTED IMPACTS: The weather system digging into NV today has pushed a surface cold front across the area, which has brought breezy to gusty northerly winds with gusts to 25-35 mph across much of the region. A weak piece of energy currently moving into southern NV will only bring some brief scattered mid-high clouds as it moves south this afternoon. Otherwise, expect mostly clear skies through this evening before clouds increase across the southern CWA early Tuesday morning.
As the trough closes off overhead tonight, the strong NE winds will only glance across far northern Inyo County, resulting in very isolated enhanced NE winds across the eastern Sierra overnight tonight. As this system evolves through Tuesday, surface pressure gradients will continue to tighten, resulting in enhanced winds remaining overnight across much of the region, with a slight increase in winds by late morning Tuesday compared to today's. As the trough moves southwest, the winds will swap to more of a NE to ENE orientation Tuesday, producing gusts to 30-40 mph with isolated areas seeing gusts as high was 45-50 mph across southwest Inyo and western San Bernardino counties, where reserve downslope winds are possible.
Besides winds, some limited moisture and forcing will allow for some scattered showers mainly impacting areas south of the I-40 corridor. Latest HREF guidance suggests a brief window early Tuesday afternoon for some light showers to develop in Clark County and eastern Mohave County, likely only producing a few sprinkles. The precipitation that does fall is expected to be very light, with storm total QPF values only 0.10"-0.25" for areas south of I-40 through Wednesday.
Temperatures will be the coolest Tuesday, with afternoon highs slightly below seasonal normals, even despite the enhanced winds. Temperatures will return to above seasonal normals by Wednesday.
LONG TERM. Thursday through next weekend.
By Thursday, the closed low off the CA Baja will continue to weaken and lift off to the northeast moving across Sonora and AZ. Ensembles are still uncertain on how much moisture will be left as the low lifts northeast. Current forecast keeps some slight chances across the far southeast edges of our CWA. Thereafter, another potent weather system is expected to dig across the southwest Friday- Saturday. WPC's Cluster Analysis indicates there's still decent variance regarding the timing, strength, and exact location of this trough. So the details of this system are still murky. Regardless, the potential for increased winds, moisture and cooler temperatures are increasing for next weekend.
AVIATION. For McCarran . Gusty north winds will continue through the TAF period, lingering into Tuesday evening. Gustiest conditions are expected during the daylight hours, though bursts of stronger winds will be possible overnight as well. Scattered high clouds through this evening will descend to lower altitudes late tonight, with SCT-BKN clouds in the 8-10kft AGL level with a chance of lower clouds to near 5K possible, mainly after daybreak Tuesday.
For the rest of southern Nevada, northwest Arizona and southeast California . Gusty north winds will continue through the TAF period, with strongest winds focused along the Colorado River Valley where gusts exceeding 30 knots are possible. High clouds through this evening will transition to SCT-BKN clouds AOA 10KFT Tuesday morning, with a chance of light showers and lower clouds to 5KFT AGL mainly south of I-40.
SPOTTER INFORMATION STATEMENT. Spotters are encouraged to report any significant weather or impacts according to standard operating procedures.
DISCUSSION . Kryston AVIATION . Outler
For more forecast information . see us on our webpage: https://weather.gov/lasvegas or follow us on Facebook and Twitter
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