Heat Wave
July 20th-23rd, 2011

Bermuda high pressure dominated the region with broad southwest flow aloft. This flow ushered in hot and humid air. Temperatures across much of east central New York and adjacent western New England warmed well into the 90s with some locations reaching the century mark in the mid Hudson Valley and northwestern Connecticut. On Friday July 22nd in Dutchess County, Rhinebeck reached 104 degrees, Dutchess County Airport in Poughkeepsie reached 102 degrees and Mills Norre State Park came in with 100 degrees. In Columbia County, 101 degrees was reported in Hudson at the Columbia County Airport. In Litchfield County, the Thomaston Dam reported a high of 100 degrees.

The most oppressive day was Thursday, July 21st, due to very high dew points in the 70s. The high humidity, combined with temperatures in the 90s, resulted in heat indices of 105 to 110 degrees up the Hudson River Valley and across adjacent western New England.

A weak boundary marked by a shift in winds and lower dew points moved southward across east central New York on Friday, July 22nd. Dew points dropped into the 50s in the wake of the boundary. However, the boundary did not reach the mid Hudson Valley and northwestern Connecticut until late in the day, and this was too late to bring any relief to the oppressive heat and humidity.

The boundary dissipated across the area Friday evening. On Saturday July 23rd, temperatures warmed in the 90s, and with dew points in the upper 60s and lower 70s, resulted in heat indices of 100 to 104 degrees across the Capital District, mid Hudson Valley, southern Taconics, southeastern Catskills and southern Litchfield County.

Public Information Statement with temperatures

Surface Map 8 pm July 20, 2011
Surface Map 8 pm EDT July 20, 2011
500 mb Map 8 am July 20, 2011
500 mb Map 8 am EDT July 20, 2011
Surface Map 8 pm July 21, 2011
Surface Map 8 pm EDT July 21, 2011
500 mb Map 8 am July 21, 2011
500 mb Map 8 am EDT July 21, 2011
Surface Map 8 pm July 22, 2011
Surface Map 8 pm EDT July 22, 2011
500 mb Map 8 am July 22, 2011
500 mb Map 8 am EDT July 22, 2011
Surface Map 8 pm July 23, 2011
Surface Map 8 pm EDT July 23, 2011
500 mb Map 8 am July 23, 2011
500 mb Map 8 am EDT July 23, 2011
Surface Map 8 pm July 24, 2011
Surface Map 8 pm EDT July 24, 2011
500 mb Map 8 am July 24, 2011
500 mb Map 8 am EDT July 24, 2011