Sunday, July25, 2021
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Marine Weather and Tides
Myrtle Beach, SC

Version 3.4
NOTICE
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 6:21AMSunset 8:22PM Sunday July 25, 2021 12:59 PM EDT (16:59 UTC) Moonrise 8:58PMMoonset 6:48AM Illumination 98% Phase: Waning Gibbous; Moon at 16 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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AMZ254 Coastal Waters From Little River Inlet To Murrells Inlet Sc Out 20 Nm- 954 Am Edt Sun Jul 25 2021
Rest of today..SE winds 5 to 10 kt. Seas 2 to 3 ft.
Tonight..S winds 5 to 10 kt. Seas 2 to 3 ft.
Mon..S winds 5 kt, increasing to 10 kt in the afternoon. Seas 2 to 3 ft.
Mon night..SW winds 10 kt. Seas 2 to 3 ft. A slight chance of showers and tstms.
Tue..SW winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers and tstms.
Tue night..SW winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers and tstms.
Wed..SW winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers and tstms through the day.
Thu..SW winds 5 to 10 kt, increasing to 10 to 15 kt. Seas 2 to 3 ft. Winds and seas higher in and near tstms.
AMZ200 954 Am Edt Sun Jul 25 2021
Synopsis for coastal waters from surf city north carolina to south santee river south carolina out to 20 nautical miles.. Low pressure off the florida east coast will maintain onshore winds across the carolinas through tonight. Bermuda high pressure and the approach of a front will turn winds southwesterly by Monday, along with an increasing potential for showers and Thunderstorms Monday night into Tuesday.


7 Day Forecast for Marine Location Near Myrtle Beach, SC
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location: 33.68, -78.89     debug


Area Discussion for - Wilmington, NC
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FXUS62 KILM 251351 AFDILM

Area Forecast Discussion National Weather Service Wilmington NC 951 AM EDT Sun Jul 25 2021

SYNOPSIS. Dry weather will continue Sunday with pleasant temperatures. Unsettled weather returns Monday night through early Wednesday. Dry and warm end of the week before rain chances return for the start of next weekend.

UPDATE. 12Z CHS/MHX soundings show dry air above an inversion around 900 mb, therefore rain chances today will remain very low. If any drops do fall, it would most likely be along the Georgetown- Horry county sea breeze front, which is already showing up in visible satellite imagery. Generally clear skies this morning will begin to fill in with shallow, low-topped cumulus by noon, and have tweaked sky cover grids accordingly. Also made just minor tweaks to the hourly temps to line up with morning diurnal trends. Resulting max temps forecast still a degree or so below MOS consensus most areas, per previous discussion.

Over the coastal waters, light flow continues due to surface ridge axis across the interior Carolinas. This, combined with the low pressure off the east coast of Florida, will result in an onshore trajectory, with seas averaging 2-3 ft.

NEAR TERM /THROUGH MONDAY/. Upper level northwest flow that has covered the Carolinas for the past several days will weaken today as ridging centered over Texas builds eastward. 500 mb temps will soar to almost -3C, just about as warm as it can get around here outside of a mature tropical system. Warm conditions aloft plus considerable dry air lurking just above the surface should give us another day with near-zero precip chances. MOS highs have been running 1-3 degrees too warm the last few days, but with the surface flow veering southeasterly today this effect may begin to wane. My forecast highs range from the mid 80s on the beaches to the around 90 inland.

A tropical disturbance about 150 miles east of the Florida east coast has struggled to organize due to wind shear and very dry air aloft. As the system moves westward toward Florida and a cold front begins to approach North Carolina from the north on Monday, our wind directions should veer southerly. A potent upper level disturbance diving southeastward across North Carolina late Monday afternoon should be accompanied by thunderstorms, potentially organized into a southward moving squall line. At this time it appears the convection should wait until after dark to reach our portion of the Carolinas, so I'll keep forecast PoPs low (10-20 percent) Monday afternoon. Highs Monday should reach the lower 90s inland with upper 80s on the coast. Heat index values will reach 100 degrees in many locations.

SHORT TERM /MONDAY NIGHT THROUGH TUESDAY NIGHT/. Unsettled weather in store for the short term period as low level southerly winds advect increased moisture to the area. Precipitable water values increase to near 2.3 inches in spots Monday night through Tuesday night, which is above the 90th percentile this time of year. Forcing however doesn't look too impressive for widespread coverage. A weak surface front approaches from the north Tuesday, before either stalling or washing out by Wednesday. Several waves of upper level impulses move across Monday night and Tuesday which will aid scattered convection. Most of the area away from the coast has a marginal risk of excessive rainfall Tuesday from WPC. Although forcing isn't strong, high PWs, decent instability, and slow storm motions could lead to localized flooding with any deep storms. Temps near normal with highs around 90 Tuesday and lows in the low 70s Monday and Tuesday nights.

LONG TERM /WEDNESDAY THROUGH SATURDAY/. Could see rain chances linger into Wednesday, particularly along sea breeze, before very dry mid level air moves in Wednesday afternoon and lingers through Thursday. Another trough and attending surface front approaches from the north Friday into Saturday, with chance of rain forecasted for start of the weekend. Near normal temps Wednesday will increase to above normal for Thursday and Friday as 850 temps rise to about 22 deg C. Friday currently the warmest day of the week, with high temps around 95 aided by downslope flow. With increased humidity, heat indices are currently forecasted in the low 100s for both Thursday and Friday.

AVIATION /14Z SUNDAY THROUGH THURSDAY/. VFR conditions should prevail through the 12Z TAF period. However, a potential trouble spot will be along the SC coast this morning as lines of cumulus clouds will move onshore affecting CRE and MYR. There may be short-lived MVFR ceilings with cloud bases near 2500 feet AGL until 14Z. After 14Z, clouds should tend to diminish near the coast as the seabreeze circulation begins to develop. Inland and up at ILM, only scattered clouds are expected today into tonight. Will see an increase in low-level moisture tonight, so MVFR fog is possible before sunrise Monday morning, especially at KFLO and KLBT. However, confidence is a bit shaky here. Will reevaluate at 18Z TAF issuance.

Extended Outlook . No organized areas of MVFR/IFR conditions are expected. Thunderstorm coverage should increase by Tuesday with better potential for brief IFR visibility then.

MARINE. Through Monday . A tropical disturbance located about 150 miles east of the Florida east coast is creating modest east to southeast winds along the South and North Carolina coast this morning. This pattern should continue through the afternoon and into tonight with wind speeds remaining 10 knots or less. By Monday the tropical disturbance should move westward across Florida and a front will begin to approach North Carolina from the north. This combination should allow our wind directions to veer southerly with speeds during the afternoon increasing to 10-15 kt.

Sea heights are currently near 3 feet across the area, mainly in a 7 second southeast fresh swell. Little change is expected through Monday.

Monday night through Thursday . South-southwest winds around 10 kts dominate the coastal waters forecast Monday night through Thursday, with brief veering to westerlies Wednesday morning and Thursday morning. Scattered thunderstorms possible over the waters Monday night through Wednesday due to increased moisture and upper level forcing. Seas linger in the 2-3 ft range through Thursday, predominantly SE swell with a southerly wind chop mixed in.

TIDES/COASTAL FLOODING. Even though we're several days past this month's full moon tidal ranges remain elevated. Minor coastal flooding again appears likely to occur this evening. On the beaches high tide should occur around 9:30 pm, and around midnight on the Cape Fear River at downtown Wilmington. Modest southeast winds will help sustain the positive water level anomaly we've seen for several days averaging +0.6 feet at the beaches and +0.9 feet on the lower Cape Fear River.

ILM WATCHES/WARNINGS/ADVISORIES. SC . None. NC . None. MARINE . None.

SYNOPSIS . ILM UPDATE . CRM NEAR TERM . TRA SHORT TERM . VAO LONG TERM . VAO AVIATION . IGB MARINE . TRA/VAO TIDES/COASTAL FLOODING . TRA


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MROS1 - 8661070 - Springmaid Pier, SC 2 mi59 min 80°F
41024 - Sunset Nearshore (SUN 2) 24 mi51 min ESE 7.8 G 9.7 81°F 84°F1019 hPa
SSBN7 24 mi72 min 2 ft
NIWS1 - North Inlet-Winyah Bay Reserve, SC 28 mi74 min ENE 7 81°F 1017 hPa73°F
41108 46 mi59 min 82°F2 ft

Wind History for Springmaid Pier, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Myrtle Beach International Airport, SC2 mi63 minVar 510.00 miPartly Cloudy83°F73°F72%1018 hPa
North Myrtle Beach Grand Strand Airport, SC13 mi66 minVar 410.00 miFair84°F72°F67%1017.8 hPa
Conway Horry County Airport, SC16 mi64 minE 310.00 miFair84°F70°F62%1017.9 hPa

Link to 5 minute data for KMYR

Wind History from MYR (wind in knots)
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Last 24hrE8E8E10
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E7E10E76E8E7E4E46SE5E5CalmN4CalmN3CalmN43E5E65
1 day agoE10
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E8E7E7E8E6E6E7E5E6E3N4CalmN4N45NE8NE7E7
2 days agoS8S8S12S11S10S10SW64W4CalmCalmNW3CalmCalmCalmCalmN3CalmN4N5N6N64NE7
G15

Tide / Current Tables for Myrtle Beach, South Carolina
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Myrtle Beach
Click for Map
Sun -- 03:13 AM EDT     -0.33 feet Low Tide
Sun -- 06:22 AM EDT     Sunrise
Sun -- 07:47 AM EDT     Moonset
Sun -- 09:09 AM EDT     5.44 feet High Tide
Sun -- 03:18 PM EDT     -0.23 feet Low Tide
Sun -- 08:20 PM EDT     Sunset
Sun -- 09:41 PM EDT     6.62 feet High Tide
Sun -- 09:58 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.41.70.3-0.3-0.10.92.43.955.45.24.331.60.4-0.2-00.92.44.15.56.46.65.9

Tide / Current Tables for Socastee Bridge, ICWW, South Carolina
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Socastee Bridge
Click for Map
Sun -- 12:57 AM EDT     2.53 feet High Tide
Sun -- 06:23 AM EDT     Sunrise
Sun -- 07:48 AM EDT     Moonset
Sun -- 08:31 AM EDT     -0.13 feet Low Tide
Sun -- 01:14 PM EDT     2.02 feet High Tide
Sun -- 08:21 PM EDT     Sunset
Sun -- 08:35 PM EDT     -0.18 feet Low Tide
Sun -- 09:58 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.32.52.42.11.71.10.60.2-0.1-0.10.41.11.7221.71.40.90.50.1-0.1-0.10.31.1

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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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