15″ from Woodbridge to Ft. Belvoir

Rainfall Totals from the Remnants of Tropical Storm Lee — Fifteen Inches or more (Areas in white)

Monday through Friday (September 5 - 9th 2011) Rainfall Totals from Lee

Rainfall Totals from the Remnants of Tropical Storm Lee — Twenty Inches or more (Areas in white)

30 Day Rainfall Totals — Includes Hurricane Irene and Remnants of Lee

Hurricane Irene and Tropical Storm Lee (30 Day Rainfall Totals)

600% of Normal Rainfall —  Last 30 Days — Unprecedented

Six Months of Rain Falls in 30 Days

The Latest on Powerful Hurricane Irene

  • Hurricane Irene’s exact track will make the difference between Hurricane force winds (74 mph +) or Tropical Storm conditions (39 to 73 mph) in the immediate Washington Area.  Obviously at this time the greatest concern for Hurricane conditions is across the Chesapeake Bay and the Beaches.  The western suburbs will likely see only tropical storm force winds (if Irene behaves and stays along the east coast vs. a more inland track).
  • Now would be a good time to at least be prepared for ***** winds sustained between 39 and 50 mph with possible gusts up to 70 mph (especially from I-95 towards the beaches).
  • Right now (Thursday @ 8PM) it appears that Irene’s strongest winds and heaviest rains will visit the Washington Area late Saturday night through Sunday Noon.  Conditions should improve Sunday during the mid to late afternoon.


A more inland track: Sunday 6 AM -- Worst case scenario for the immediate DC Area with hurricane force wind gusts and 5 to 10 inches of rain

A track offshore would bring at least tropical force storm wind gusts with 2 to 5" of rain in the immediate DC Area and 6 to 9" further east


  • If Hurricane Irene takes a more inland track we will have conditions very similar to what we experienced during Hurricane Isabel.
  • Make sure you have a full gas tank on Saturday in case Irene takes the more inland track on Sunday morning.

Taste of Fall … then Hurricane Irene?

  • A strong cold front will cross the Washington Region Sunday bringing with it more afternoon thunderstorms. Some storms will become severe with damaging winds and hail
  • Beautiful weather is in store for the entire Mid-Atlantic Monday and Tuesday.

Highs on Tuesday will struggle to reach 80 degrees in Washington

  • Lows on Tuesday morning will fall into the mid 50s in the Shenandoah Valley, upper 50s in the outer northern and western suburbs and mid 60s in Washington and Baltimore.  Highs will struggle to reach 80 from Washington to New York with upper 70s in the western suburbs of the big cities.


  • Global Forecast Models take Irene very near the southern Florida coast and then pull her up the eastern seaboard late next weekend.
  • The remains of tropical systems would end any remaining drought conditions across Northern Virginia, southern Maryland and parts of lower Delaware and would also bring flooding problems to parts of the area that have received excessive amounts of rain during the past two weeks.
  • If Irene does track close to the spine of the Appalachians, a tornado outbreak would be possible with extreme wind shear in the atmosphere… stay tuned!