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Marine Weather and Tides Union, WV Version 3.4

What's New / NOTES 10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome. 10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

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Sunrise 7:06AM

Sunset 6:04PM

Sunday February 17, 2019 11:14 PM EST (04:14 UTC)

Moonrise 3:51PM

Moonset 5:38AM

Illumination 98%

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.

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7 Day Forecast for Marine Location Near Union, WV

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Area Discussion for - Blacksburg, VA

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Fxus61 krnk 180233 afdrnk area forecast discussion national weather service blacksburg va 933 pm est Sun feb 17 2019 Synopsis An area of low pressure will progress into and across the area tonight with its associated frontal boundary crossing the carolinas. After a brief break in teh wet weather Monday night into early Tuesday, the forecast turns very soggy for the remainder of the week. Tuesday night into Wednesday, enough colder air will be over the region for the strong potential for a significant winter event. Near term through Monday As of 930 pm est Sunday... low pressure was heading eastward through central kentucky, associated with a large swath of rain across the mid-atlantic. Rain is expect for much of the overnight until the low clears the area early Monday morning. In advance of the low, a wedge of high pressure on the east side of the appalachians was maintaining a cold airmass near the surface. This was primarily resulting in a cold rain with some icing near the blue ridge parkway and across the highlands of va wv. At 9pm, temperatures were still flirting with 32 degrees in some of these locations which is allowing the ice accretion on the trees to persist. Temperatures are expected to warm a few degrees overnight, so little or no additional icing is expected. The evening rnk sounding was +8 deg c just above 850 mb... Which equates to 46 degrees f. The higher mountain ridges may actually warm into the lower 40s overnight as this warm air lowers in altitude just ahead of the approaching low pressure. The actual temperature of the rain also gets modified a few degrees before reaching the surface, so the more it rains, the warmer it should get overnight. Overall precipitation amounts ranged from a quarter to three quarters of an inch Sunday. There were even reports of thunder during the afternoon, some of which resulted in isolated rain amounts of up to 1 inch. Additional rain overnight is expected to remain under a half inch. That said, not out of the question for a few locations to see 24 hour amounts (ending 7am Monday) to range from 1.0 to 1.5. Give the localized nature of the heaviest rain, flooding is not expected. Never the less, ponding of water is a high likelihood with some poor drainage issues. Overall, the current rainfall increases the sensitivity of the streams and creeks to future runoff from rain later in the week, but nothing of the life threatening variety at the moment. On Monday, we will be on the back side of the departing system, and winds will shift northwest and become gusty. Gusts of 30 to 40 mph will be common across the highest terrain along and west of the crest of the blue ridge. Gusts of 15 to 25 mph will be common across the piedmont region. These same northwest winds will allow for drier air to erode cloud cover across the piedmont. However, clouds will be slower to erode across the mountains thanks to an upslope component. Light precipitation in the form of light rain drizzle or light freezing rain drizzle will be possible across western greenbrier county heading into the afternoon. A few flakes of snow are possible as the top of the shallow moisture layer cools to about -10c late in the day. High temperatures tomorrow will range from the low to mid 40s across the mountains with low to mid 50s across the piedmont. Short term Monday night through Wednesday night As of 400 pm est Sunday... very active and unsettled pattern to continue through the period with significant potential for a winter storm, with both significant ice and snow accumulations possible, followed by an extended period of moderate to heavy rain events. Areal flooding and river flooding seem almost certain as we move into the mid part of the week and the weekend. The culprit will be a very active southwest flow as deep troughing remains anchored across the southwest u.S. With an endless series of vigorous embedded short waves tracking from the southwest u.S. Into the south central u.S. Then moving east-northeast to northeast toward the mid-atlantic. In essence the main storm track will be right across our area through the entire time frame. This will supply persistent cloud cover and numerous rounds of precipitation. Flooding from excessive rainfall and saturated ground will clearly be the main concern, especially as the week progresses continuing into the long term periods. Unfortunately, with a canadian air mass lingering just to our north and meandering oscillating back forth across our latitude, there will be a definite concern for winter weather. That concern has solidified considerably from yesterday as the depth of cold air appears more certain and further south than indicated yesterday, which is consistent with a deeper wedge developing in response to the slow deepening trough in the south central u.S. As the warm nose from a strong southwesterly jet works its way over the shallow cold air mass later in the night Wednesday morning, the precipitation will transition to sleet and then freezing rain. Model signals are strong for significant snow, sleet, and ice accumulations, and this could well be the most significant winter storm in terms of total accumulation since the mid-december event. With good collaboration via wpc and neighboring offices this afternoon, we concurred on the potential for winter weather with this event and have followed their snow and ice accumulations closely, namely winter storm warning criteria ice of .25 to .50 inch and snow accumulations of 4-8 inches across the north with 1-3 inches in the south. Given that this is 72+ hours out, no headlines have been issued yet, but will strongly highlight the

potential in the hwo ehwo. Current indications are that the winter weather event will transition into a flooding event through the day Wednesday and Wednesday night. Current QPF projections are in the 2-4 inch range for the tue-thu time frame, which is in addition to all the rain we have received over the weekend and early this week. Wpc has noted that there are numerous models with strong signals for flooding across a large portion of the southeastern u.S., tn valley, and into the southern appalachians. Again, being that this is over 72 hours out, no headlines have been issued at this time, but areal flooding and river flooding appears likely. Please plan accordingly. Temperatures will average near normal during this period as we oscillate between the colder canadian air mass present just to our north and the much milder air to our south. Thus, there will be some fluctuations above and below normal through the time period. Wednesday will remain below normal, but much above normal temperatures are expected as the week progresses. Confidence in forecast parameters temperatures - moderate to high, precipitation probabilities - high, winter weather potential - moderate, flooding potential - moderate to high, winds - moderate to high. Long term Thursday through Sunday As of 430 pm est Sunday... very wet and unsettled weather continues with a positively tilted mean trough in the western u.S. And a broad subtropical ridge remaining anchored off the southeast u.S. Coast. This will keep a conveyor belt of deep moisture anchored over the area along with an active baroclinic zone. Temperatures will start out below normal on Wednesday, then creep to above normal levels by the end of the week as the baroclinic zone is nudged a tad further north thanks to the peristent subtropical ridge off the southeast u.S. Coast. Indications are that the baroclinic zone will slip south of the area briefly as high pressure builds to our north on Thursday, to provide a small opportunity for the heavier rain to shift south of our area. However, another significant wave emanating from the southwest u.S. Trough is progged to push the baroclinic zone back north into our area Saturday with more heavy rain and flooding possible at that time. At any rate, temperatures will finally warm enough with southwest flow to erode the returning wedge, that the main focus through this period will be flooding, not winter weather. Wpc days 1-7 precip outlook currently highlights areas exceeding 4" mainly in western nc, eastern tn, and southwest va. Areawide, expect at least 2-3", with local amounts of 4-5 inches likely. Please remain abreast of the threat of flooding and river flooding with later forecasts as their is an increasing threat for areal flooding and river flooding, especially during the later half of the week. As noted above, with the region increasingly in the warm sector during this period, temperatures will average above normal and remain mostly above freezing. Aviation 01z Monday through Friday As of 930 pm est Sunday... ifr lifr a high likelihood overnight. Rain is expected for most of the overnight with low stratus and fog. The area of low pressure responsible for the poor flight conditions is forecast to move east of the area early Monday. This will begin a period of clearing with improvement back into theVFR range from Monday afternoon into early Tuesday. The only exception with be the western side of the appalachians from the eastern oh valley into pa WV where low level strato-cu will persist promoting MVFR. In the wake of this storm system, winds will shift northwest and trend gusty. Winds gusts of 15 to 25 kts will be common Monday and early Monday night. Forecast confidence in the above scenario is moderate. Extended aviation discussion... lingering mountain cloudiness is expected to maintain MVFR cigs across the mountains through Monday night. Brief break in the wet weather is expected Tuesday, conditions primarilyVFR. Tuesday night and Wednesday another low pressure system will bring sub-vfr conditions as well as providing another opportunity for winter precipitation. A frontal boundary will remain close to the region Thursday into Friday keeping precipitation and the potential for sub-vfr conditions in the forecast. Rnk watches warnings advisories Va... None. Nc... None. Wv... None. Synopsis... Ds near term... Ds pm short term... Rab long term... Rab aviation... Ds pm

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Weather Reporting Stations

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Airport Reports

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Airport	Dist	Age	Wind kt	Visibility	Sky/Weather	Temp	DewPt	Humidity	Pressure
Lewisburg / Greenbrier, WV	18 mi	79 min	S 5	4.00 mi	Light Rain	36°F	35°F	99%	1009.1 hPa

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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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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.
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Wind Forecast for Blacksburg, VA (23,6,7,8)

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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 numerious 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.