(updated at 1:30 p.m.)
Rain continues steadily but should be more intermittent in the early-to-mid afternoon. Enough rain has fallen well to our northwest to prompt flood warnings for the upper Potomac River from Harpers Ferry to Point of Rocks, and for the Monocacy River around Frederick. A flood warning is also in effect to our southwest for the Rappahannock River at Remington (affecting Fauquier and Culpeper counties) and around Fredericksburg. See the full list of flood warnings.
In addition to the inland river flooding, strong flow from the southeast has caused tidal waters to rise, prompting the National Weather Service to issue a Coastal Flood Warning through 3 a.m. tonight.
Here is some of the key information from the warning:
* TIDAL ANOMALY...2 TO 3 FEET ABOVE NORMAL.
* TIMING...NEAR TIMES OF HIGH TIDE THROUGH TONIGHT.
* EXPECTED IMPACTS...MODERATE TIDAL FLOODING DURING TIMES OF HIGH TIDE.
The NWS warning includes a listing of area coastal water high tides encompassing the tidal Potomac and Chesapeake Bay.
Rainfall totals so far have generally been around 0.5-1.0”, with some higher totals over 1” south, east and southeast of the District. For the most part, I haven’t seen reports of street flooding and creek/stream flooding in the immediate metro region, but that is possible later.
The action becomes more intermittent late this morning and into the early-to-mid afternoon, but more heavy rains and thunderstorms (some of which may be severe especially south of town) are possible later this afternoon into the evening.
Total rainfall potential remains in the 1.5-2.5” range (with some locally higher amounts), but for the immediate metro region, the lower end of that range may be more likely based on the latest model data.