Satellite Pictures Assist in Quick Detection of Rapid Severe Weather Development

At 1630Z some thought was given to updating a forecast, released earlier at 1500Z, by removing the mention of any precipitation. It was noticed, however, that the upper air trough was still approaching from the west and the 1600Z satellite picture (Figure 2A) did show convective clouds to the west over New Jersey and northeast Pennsylvania, By comparison with earlier pictures it could be seen that these clouds were increasing both in size and coverage. It was decided to delay any amendment to the forecast.