NYC SEA BREEZE EVENT William T. Thompson, Teddy Holt, and Julie Pullen Naval Research Laboratory Monterey, CA

NYC SEA BREEZE EVENT Results are shown for nest 5 Δx = 444 m Period is preceded by 5 days of data assimilation Urban canopy parameterization is used on nests 4 and 5 (more later) High resolution, time dependent SST from NYHOPS data on nests 4 and 5

NYC SEA BREEZE EVENT Animation* from 1200 UTC 9 August to 0000 UTC 10 August 2004, showing 2 m wind (m/s) and potential temperature (K) *hourly from 12-18; 15 min thereafter Wind turns onshore at ~1600 UTC or 1400 LT and slowly advances over Brooklyn and Queens Sea breeze front reaches Manhattan at ~1700 LT Front continues into New Jersey Wind over Manhattan Island remains light throughout the period

NYC SEA BREEZE EVENT Animated cross sections in the plane A-B from 1800 UTC to 0000 UTC 22 August 2004 Frames every 15 min A-B is 37.5 km from near the shore in Brooklyn, across lower Manhattan, and into New Jersey Potential temperature (K) is shown Note the cool, shallow layer propagating along the surface from B towards A (SE to NW) Note also the density current head-like structure at the leading edge at later hours

SEA BREEZE MAPS (FROM ANIMATION) (2 M WINDS (M/S) AND POTENTIAL TEMPERATURE (K))

1HR INTERVAL 15 MIN INTERVAL

SEA BREEZE CROSS SECTIONS (FROM ANIMATION) (POTENTIAL TEMPERATURE (K))

A B

A B