Timing Ida’s Impacts on the Washington DC Region

Storms Develop Tuesday Evening

Tuesday will feature mostly cloudy skies and increasing humidity with highs near 86.  Scattered Thunderstorms are forecast to develop during the evening and overnight hours producing some heavy rainfall for parts of our area.


The steady/heavy rain is forecast to remain along/west of Interstate 81 and along/north of the Maryland/Pennsylvania border during the morning and early afternoon on Wednesday.  These locations will be close to the stalled out frontal boundary.

Severe Storms Possible Wednesday Afternoon 

The late afternoon and evening hours on Wednesday will be interesting when numerous thunderstorms are are forecast to develop while wind shear will be increasing in the atmosphere.  Some thunderstorms will have the potential to produce tornadoes and damaging winds (along with torrential rainfall in a  short amount of time).

Wednesday Night and Thursday Morning 

This will be the most dangerous time frame of Ida’s remnants as numerous thunderstorms with torrential rain likely prompt Flash Flood Warnings as the front approaches the Washington Area and Ida’s tropical moisture gets rung out across the metro area. Nighttime flooding is very dangerous and people in flood prone areas need to have a plan of action.

Potential Rainfall Totals

Most of the forecast models have been pretty consistent in forecasting between 2 and 4″ of rain in the immediate Washington Area with upwards of 6″ or more, well north and west of the Beltway, but the map below doesn’t take into account convective elements or areas where thunderstorms may “train” over the same areas.  Some spots even in metro DC could pick upwards of 5″ + of rain.

I fear Wednesday night will be a long night for everyone with weather radios/phones screeching “Flash Flood Warnings” and “Flash Flood Emergencies”.

Thursday through the Upcoming Holiday Weekend (The Good news)

The rain is forecast to pull out of the region on Thursday morning with breezy conditions and decreasing clouds during the afternoon. Highs on Thursday will feel quite refreshing with mid 70s and northerly winds helping to dry things out slowly.

The upcoming Labor Day Weekend is looking amazing with mostly sunny skies and pleasant temperatures in the lower to middle 80s!

Low temperatures will actually dip into the upper 50s in the suburbs Friday and Saturday night! How’s that for a refreshing change!