Tuesday, August4, 2020
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Marine Weather and Tides
Roanoke, VA

Version 3.4
NOTICE
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 6:26AMSunset 8:25PM Tuesday August 4, 2020 12:57 AM EDT (04:57 UTC) Moonrise 8:27PMMoonset 6:10AM Illumination 100% Phase: Full Moon; Moon at 15 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 Roanoke, VA
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location: 37.28, -79.96     debug


Area Discussion for - Blacksburg, VA
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FXUS61 KRNK 040035 AFDRNK

Area Forecast Discussion National Weather Service Blacksburg VA 835 PM EDT Mon Aug 3 2020

SYNOPSIS. Tropical Storm Isaias will track northward through the eastern Mid-Atlantic tonight and early Tuesday, before exiting the region later in the day Tuesday. As a result, expect widespread rain, heavy at times, especially along and east of the Blue Ridge. After the tropical storm clears the area, we will transition into a more typical summertime pattern with a daily threat for scattered afternoon and evening thunderstorms.

NEAR TERM /THROUGH TUESDAY/. As of 830 PM EDT Monday .

Bands of moderate to heavy rain will primarily fall across the piedmont overnight. With this in mind, we have canceled the Flash Flood Watch west of the Blue Ridge to include the Roanoke and southern Shenandoah Valleys.

As of 720 PM EDT Monday .

A brief break in the rain early this evening, but will see northern bands of Isaias edge into the piedmont for the rest of the evening. For the most part, showers should remain relatively light, then pick up in intensity towards midnight as the tropical system gains latitude. The western edge of Isaias is expected to bring 2-5 inches of rain to the piedmont and 1-3 inches to the foothills and eastern slopes of the Blue Ridge overnight. We will continue to monitor this event and may cancel portions of the Flash Flood Watch west of the Blue Ridge later this evening.

As of 400 PM EDT Monday .

Primary concern through tonight is potential for excessive rainfall. Isaias is gradually gaining latitude over the eastern Carolinas with bands of heavy rain extending north into Virginia. Heavy rain in advance of this tropical system is expected to impact much of the eastern Mid-Atlantic Region tonight and early Tuesday with the heaviest rain favoring areas east of the Blue Ridge. What will have to be watched is how Isaias begins to interact with a strong upper level trough which extends from the western Great Lakes into the Mid-MS valley. The interaction between this trough and the tropical cyclone will favor a swath of heavy rain just northwest of the tropical cyclone track which may impact our eastern CWA . areas east of Highway 29. The other caveat is the highly sheared environment which may lead to embedded severe thunderstorms . albeit isolated in terms of the overall threat compared to the excessive rain potential. At the very least, momentum mix down will result in gusty surface winds at times, especially within the bands of heavier rain.

The storm is expected to clear our forecast area by noon Tuesday with partial clearing for the afternoon. In its wake expect increasing pressure rises and a gusty winds . shifting from northeast to the northwest with time.

Given the overcast conditions, temperatures will fluctuate very little tonight with lows in the 60s mountains to the lower 70s in the piedmont. High temperatures Tuesday are expected to recover into the 80s once the sun pops out in the afternoon . mid 70s in the mountains.

SHORT TERM /TUESDAY NIGHT THROUGH THURSDAY NIGHT/. As of 400 PM EDT Monday .

Dry air in the mid/upper levels will quickly overspread the region by Tuesday night resulting in a period of drying. A cold front associated with the upper trough will also cross the area helping to scour some of the low level moisture resulting in clearing for Tuesday night.

For mid week and beyond, the expectation is for a return to a more normal summertime pattern with respect to both temperature and precipitation . the rain threat primarily diurnally driven with hit and miss afternoon and evening showers and thundershowers.

LONG TERM /FRIDAY THROUGH MONDAY/. As of 400 PM EDT Monday .

High pressure is expected to gradually build aloft for the weekend . temperatures warming. This will favor temperatures to trend to the warmer side of normal with highs testing the lower 90s east of the Blue Ridge and 80s for the mountain valleys. Precipitation chances still appear to be limited to the peak heating of the day induced showers/thundershowers but will little or no organization.

AVIATION /01Z TUESDAY THROUGH SATURDAY/. As of 740 PM EDT Monday .

Variable weather conditions anticipated through Tuesday as Isaias tracks north. The lowest flight categories are anticipated tonight along and east of the Appalachian Divide and toward to coast due to the impacts of the tropical cyclone. Once the storm gains latitude and starts moving away from the area Tuesday, expect clearing in its wake as northwest downslope winds develop.

Extended Aviation Discussion .

Conditions are expected to improve to VFR on Wednesday and generally remain this way through Friday, but some early morning patchy fog and scattered afternoon showers and thunderstorms could temporarily restrict flight conditions during this time.

HYDROLOGY. Flood Watch is in effect for much of the forecast area and will remain in effect until Tropical Storm Isaias clears the region. Rain, heavy at times tonight and early Tuesday is expected to impact the eastern Carolinas and into eastern VA. Rain bands may occasionally drift into the mountains but the primary threat for excessive rainfall is anticipated along the northwest track of the cyclone which may brush southside Virginia and NC Piedmont . SE of Danville. Due to the dry antecedent conditions, flooding concerns are limited to the smaller streams as opposed to the larger rivers.

RNK WATCHES/WARNINGS/ADVISORIES. VA . Flash Flood Watch through Tuesday evening for VAZ022>024- 032>035-043>047-058-059. NC . Flash Flood Watch through Tuesday evening for NCZ004>006. WV . None.

SYNOPSIS . PM NEAR TERM . PM/RCS SHORT TERM . PM LONG TERM . PM AVIATION . RCS HYDROLOGY . PM


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Roanoke, Roanoke Regional Airport, VA3 mi63 minE 510.00 miOvercast71°F66°F87%1015.3 hPa
Virginia Tech Airport, VA24 mi62 minN 010.00 miMostly Cloudy67°F67°F100%1017.9 hPa

Link to 5 minute data for KROA

Wind History from ROA (wind in knots)
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Last 24hrCalmCalmCalmCalmW3CalmCalmNW333SE3SE5W6W54CalmE8SE9S5SE6SE4E8E5E5
1 day agoCalmE3CalmCalmCalmCalmCalmW5SW5SW10SW7
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2 days agoCalmE5CalmCalmCalmCalmW4W3SW3SW3Calm3SE8SE6SE9E7SE11SE12S11S6CalmE4SE4Calm

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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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 Blacksburg, VA (0,6,7,8)
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Ground Weather Radar Station Blacksburg, VA
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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 numerous 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.