(UPDATED)
Here is a screenshot of the National Weather Service hydrograph for Lambertville and New Hope as of 10:45 AM, September 10, 2011.
We have now clearly passed the "second" crest for this storm (Lee), which "secondary" peak reading was 15.1 inches at 8:00 AM on Friday morning (09/09/11). The highest reading for this storm was recorded early on Thursday morning -- 16.14 feet at 7:00 AM EDT.
The graph above shows the "real time" and "projected" flood level readings of the Delaware River at the free bridge in town, as they were at that specific time earlier Saturday morning.
The dark blue line represents the actual observed readings, and the current forecast readings are represented by the dotted green line. (To enlarge, right click on the image, and open in a new tab.)
The actual on-line version of this is a dynamic graph. You may want to "favorite" it for future reference.
It changes somewhat frequently, based on the latest readings and on the changing forecast from the National Weather Service, including for Lambertville. The latest data set records that a second "crest" of 15.1 feet for this storm appears to have been reached at 8:00 AM yesterday morning (09/09), and that the river level is now dropping. Just past midnight, it began dropping below the 13-foot flood stage, and by mid-afternoon at 2 PM (09/10), the 10.5 foot point will be reached, where, as was announced earlier by the City, the fire company can begin pumping out basements in the flood zone.
On Thursday, the projected "second crest" was for 15.2 feet, which prediction was down from 16.7 feet, as had forecast several hours earlier, at 11:45 that morning. And, the data set indicated that it had been forecast to occur later in the day -- at 2:00 PM EDT in the afternoon (18:00 UTC), rather than at 2:00 AM as had been previously forecast. An earlier forecast was for the "secondary crest" to be even higher, but fortunately that did not happen.
The prior actual "crest" of 16.14 feet, reached at 7:00 AM EDT on Thursday (09/08) as a result of the intense rains on Wednesday, had abated somewhat, down to a trough of 14.35 feet on Thursday evening, when it began to climb up again as a result of flood waters from north of here reaching our area.
As you can see, forecasts change, and sometimes quickly. So, be sure to check for updates frequently at the link! If you click over to the actual tabular data sheets, keep in mind that the times on the "tabs" are recorded in UTC, or "Coordinated Universal Time" and are therefore four hours ahead of Eastern Daylight Time (EDT), and five hours ahead of Eastern Standard Time (EST). It is also a "24" hour clock, like military time. For example, if a time recorded there reads "09/10 18:00" subtract 4 to get 14:00, which is "09/10 at 2:00 PM."
Again, to see the current on-line hydrograph for Lambertville/New Hope, click here.
For our local Lambertville weather forecast, click here.
To view the broader regional hydrograph map for NJ/PA/NYC/DE, click here. If you are traveling or have relatives or friends in an area in the region that you want to check on, this map is useful. Just click on any of the small colored buttons for up-to-the-date hydrographic information any specified area.
To read the City of Lambertville official updated emergency management bulletins and other important information, click here.
Be safe! Remember, part of being safe is keeping up with the latest available information.
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To illustrate how the hydrograph can significantly change over a relatively short time period, below are nine comparative screenshots of the Lambertville/New Hope hydrograph, taken over time. The latest one was as of 9:45 AM Saturday morning (09/10); one as of 6:45 PM Friday evening (09/09); one as of 5:45 PM Friday evening (09/09); the next one as of 8:45 AM Friday morning; one as of 8:45 pm Thursday night (09/08); one as of 3:45 pm Thursday afternoon; another one as of 2:45 pm Thursday afternoon; the eighth as of 1:45 pm Thursday afternoon; and the ninth as of 11:45 am Thursday morning.
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