November Record Rainfall After Record High Temperatures

November 12 2020

One extreme often breeds another in the world of weather.  The recent rain event, still underway as I write this report, produced record rain and flooding in and around central Maryland. This was from a cold front and moisture well ahead of Tropical Storm Eta.

This also came after a full week of unusually warm temperatures with two record highs. The purpose of this report is to document them both.

Record Weather Reports

The heavy rain on Veterans Day produced numerous flooding.

If you followed my forecast reports, the NAM 3 Km Model did the best job in this storm. It had looked like it was overestimating the rain, but it was close to on target!

 

 

Rainfall Records: November 11

Baltimore at BWI:

1.91″ fell, breaking the old record of 1.34″ set in 1983

 

Washington at National

2.02″ fell, breaking the old record of 1.46″ in 1987

 

Washington at Dulles

1.21″ fell, breaking the old record of 1.16″ in 1995

 

Rainfall Around The Region

Doppler Radar Estimates (pinch to zoom in closer)

Central Maryland

• The heavy rain appears to have been lined up along and east of I-95. That was the 2 inch cut off.
• Less fell north and west.  More fell south and east.
• Annapolis: Your bubble was evident and I highlighted it here with more rain falling all ‘around’ the capital.
• Delmarva including Cecil County was mostly in the  to 4 inch range.

 

Southern Maryland

• The region had widespread  inches or higher.  Note, more rain will be added to this total as the storm is not done yet.
• Souther Maryland and southeast Virginia has the most rain will 4 to 6 inches.

 

St. Mary’s River Flooding

Widespread flooding was reported around Great Mills and along the river.  This peaked within 2 Feet of Record High levels.

The good news is that the water level appeared to be dropping since early this morning.

 

 

Record Heat This Month

High temperatures should be in the lower 60s in early November at Baltimore’s BWI.  Instead, eight days were 70ºF or higher!  Two records were tied or set.

 

 

• On Nov 7th, that tied the record set in 1938 AND 1975.
• On Nov 10th, that broke the old record of 75ºF set in 1999.