Weather Report for April 13, 2013

Like last night, there was plenty of cloud cover to contend with from the same weak weather system, especially during the first half of the night. Only during the last two hours did the sky completely clear. Nonetheless, it was another good night for nearly continuous monitoring of Mrk421 during its incredible VHE outburst. The clouds were rarely too thick to prevent accurate polarimetry of this object and nearly the entire night was spent observing Mrk421. The seeing varied between 1.3-2 arcsec.