Area under flash flood watch through 6 p.m.

4 p.m. - Flash flood watch canceled

Radar shows rain associated with Florence’s remnants have pushed well southeast of the immediate D.C. area push through Southern Maryland and over the Delmarva. Washington can finally start to dry out.

Original post from midday...

Heavy show­ers and storms drenched the Washington re­gion Mon­day night, caus­ing some streams and creeks to over­flow. We’ve lost count of how many times we’ve seen this sce­nar­i­o play out since May.

Another round of show­ers and storms may lead to a re­peat this af­ter­noon.

Com­pared with Mon­day’s activity, today’s is likely to be less wide­spread and in­tense. The most nu­mer­ous show­ers and storms may fo­cus in our east­ern areas, es­pe­cial­ly to­ward southern Mar­y­land and over the Delmarva Peninsula.

How­ever, be­cause the ground is satu­rat­ed and water­ways are swol­len, it won’t take much to spur more flood­ing.

A flash flood watch is in effect until 6 p.m.

The rain so far


Estimated rainfall totals since Monday. (National Weather Service)

Since Florence’s rem­nants began affecting the re­gion, Washington has re­ceived 1.36 inch­es of rain, the bulk of it fall­ing in two rounds of storms, the first Mon­day eve­ning around 5 p.m. and the se­cond around mid­night Tues­day. Some lo­ca­tions just north of the District, in­clud­ing around Laurel, re­ceived up to 3 to 4 inch­es.

Link: List of rain­fall to­tals from National Weather Service

Mon­day marked the 18th day this year Washington has re­ceived at least an inch of rain, which ranks se­cond most on record year-to-date, behind 1886 (which had 19 through Sept. 17), according to Capital Weather Gang’s Ian Livingston.

The soak­ing pushed Washington’s 2018 rain­fall total over 47 inch­es, a­bout 19 inch­es above nor­mal, third-most on record year-to-date, behind 1886 and 1889.

Mon­day night’s rain spurred areas of flash flood­ing, in­clud­ing over North­west D.C., where a flood warn­ing was is­sued around Rock Creek Park.

“I’ve been run­ning this path head­ing to­ward P street in Rock Creek Park 5 to 6 times per week for 10 years and I’ve nev­er seen it this high in the morn­ing,” wrote Brit­ta­ny Meyer, in email.


High water along Rock Creek near P Street. (Brittany Meyer)

The over­night storms not only fea­tured heav­y rain but also deaf­en­ing thun­der that awakened many from their sleep.

“It was in­sane! Huge claps of thun­der right a­long­side the light­ning,” tweeted Capital Weather Gang Twit­ter fol­low­er Jess.

“Good lord, that was one of the loud­est thun­der claps I’ve ever heard,” add­ed Robert Lintott, tweeting from Mount Pleasant.

Tues­day’s rain po­ten­tial

Short-term mod­els show­ing wide­ly scat­tered show­ers and storms this af­ter­noon, most­ly fo­cused along and east of In­ter­state 95. The of­fi­cial National Weather Service fore­cast sug­gests 0.5 to 1.0 inch­es could fall in this eastern zone, al­though amounts will be high­ly var­i­a­ble de­pend­ing on where this hit-or-miss ac­tiv­i­ty ma­te­ri­al­iz­es.


Rainfall forecast from the National Weather Service on Tuesday.

Com­pared with Mon­day, when some storms were ro­tat­ing, trig­ger­ing tor­na­do warn­ings, we do not ex­pect a re­peat today.

Show­ers and storms should exit our eastern areas, in­clud­ing Southern Mar­y­land, by 6 p.m. or so but may con­tin­ue over the Delmarva Peninsula, push­ing west to east off the Atlantic Coast by about 10 p.m.