At 7pm the wind should be still good for flight.. see http://forecast.weather.gov/MapClick.php?w0=t&w3=sfcwind&w3u=2&w4=sky&w7=thunder&w8=rain&AheadHour=25&Submit=Submit&FcstType=graphical&textField1=40.66000&textField2=-73.78000&site=okx&unit=0&dd=0&bw=0
Anything abowe 60 km/hour (40mph) might be reason to flight cancellation.
At 7pm the wind should be