* Flood watch from 6 p.m. Thursday to 4 a.m. Friday *


The Capitol on Sept. 26, 2018. (Angela N. via Flickr)

Nearly 9 inches of rain have drenched Washington this month, the fourth-most on record for September. And we’re not done.

The same front that pushed a line of storms through the region Wednesday evening has stalled to our south, and an area of low pressure is set to form along it, sending another wave of rain north.

Weather models suggest that an inch of rain is likely to fall from Interstate 95 to the north and west. Toward the Interstate 81 corridor, 2 inches or so could fall. East of Interstate 95, amounts of 0.5 to 1 inches are most likely.


National Weather Service forecast rainfall through Friday midday. (WeatherBell.com)

Because the ground is saturated from all the recent rain and creeks and streams are full, flooding is possible as waves of moderate to heavy rain develop.

Models indicate rain will increase from southwest to northeast Thursday afternoon and evening. Steady rain arriving by the evening rush hour may cause some delays, although the heaviest rainfall may come through closer to midnight.

The rain should mostly slide off to the northeast by dawn Friday.


Simulated radar from HRRR model Thursday afternoon through Friday morning.

Given the additional rain in the forecast, Washington looks to move into at least the fifth-place spot for its wettest September. If it receives 1.44 inches or more, it would clinch a fourth-place or higher ranking.


Top 10 wettest Septembers, with four days remaining for 2018. (National Weather Service)

Washington’s total rainfall in 2018 is 48.93 inches and counting, 19.3 inches above normal, which ranks third-most on record year to date, behind 1886 and 1889, whose rainfall totals were 50.43 inches and 50.61 inches as of this date.

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