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USNA News Center

High pressure will dominate this week (14 SEP 2015)

  POSTED ON: Monday, September 14, 2015 9:33 AM by A.R. Davies

Last week 3.54 inches of rain officially fell at the weather station on Hospital Point (KNAK) over a three day period spanning Thursday to Saturday.  For comparison, the three day rainfall today is greater than the total monthly rainfall in both July (3.49”) and August (2.46”) at BWI Airport.  Fortunately, the tumultuous weather from late last week will be replaced by clam conditions this week.

The dominant weather feature will be an area of high pressure centered over southwest Virginia/northeast Tennessee as of 0400 EDT on 14 September.  With high pressure situated southwest of Annapolis on Monday morning, expect breezy northwest winds with seasonably cool conditions (the normal high temperatures at BWI airport spans 77-79 oF this week).  Note: wind flows clock-wise around high pressure systems in the northern hemisphere.

Throughout the week, the ridge of high pressure will strength and slowly slide east. As shown in the Figure below, by Wednesday evening the high pressure will be centered nearly directly over Annapolis, MD. On Thursday and Friday, the area of high pressure will be offshore, resulting in southwest winds and seasonably warm conditions for the end of the work week.   The next chance for rain (30% chance) may not arrive until Sunday night or early next week as a weak cold front approaches from the west.

MSLP Anomaly (hPA) at 1900 on 16 Sep from ECMWF EPS Ensemble Mean


Disclaimer: This is not an official U.S. Navy weather forecast and should not be confused with the official Navy weather forecast provided by the Fleet Weather Center in Norfolk, VA.  Furthermore, the official U.S. Government forecast for the greater Annapolis area is issued by the National Weather Service Baltimore/Washington Forecast Office in Sterling, VA. Please read the full disclaimer here.

Category: General Interest


Alexander R. Davies
Oceanography Department