NWS live web cam Tidal Basin:
http://www.nps.gov/common/commonspot/customcf/webcam/dsp_webcam_image.cfm?webCamURL=&refreshRate=30&title=7D9A9180BE87CF5D50DC2E948214FD&width=704&height=480&altText=7D9A9180BE87CF5D50DC2E948214FD484390E9559AA3&description=7093809BA3908E731CFE3C8B8159BC7142D2847396A1DEA796A352AAB815825A92D8D69F8B89825FEE9F181695919ADBB05FBB13741DC1C8D36AA093B27DB39BC729988588B1C6B1B98FCAEF989A9596449DD9BB9C97E9AD9ABEAFA13EA9AEC05A10BF78EBD18BD283A71C19A0B699F48FAFBABD5395AC82A4BC20B5
"The colder than average March and chilled start to April has slowed the emergence of [DC's] famed cherry blossoms. Peak bloom may not be achieved in the previously forecast April 3-7 window. Our revised window for peak bloom is April 6-10," the Capital Weather Gang stated.
As of Tuesday afternoon, the National Park Service had not revised its own estimate for the peak bloom, since it adjusted its prediction from late March to early April.
http://georgetown.patch.com/articles/cherry-blossom-peak-bloom-2013-date-revisedagain