Weather Underground Forecast for Saturday, April 28, 2012.
Thunderstorm activity was expected to spread from the Plains to the Eastern Valleys on Saturday, as a low pressure system slid eastward through the nation. The system was stretching from the Northern Plains and over the Mid-Mississippi River Valley, creating an anticipated warm front that would extend from the Upper Mississippi River Valley and up the Ohio River Valley, into the Mid-Atlantic States. This system would obtain moisture and energy from the Gulf of Mexico, allowing for scattered showers and thunderstorms to develop throughout the day. There was a slight chance that these storms would turn severe as they have a history of producing strong winds, heavy rainfall, and large hail. Tornado development was not anticipated. Along this frontal boundary, rainfall totals were expected to range from 1 to 2 inches, over 2 inches likely in areas of severe thunderstorm development.
East of this system, a strong low pressure system was finally pulling northeastward and away from the extreme Northeast. This was to allow for rain and snow showers to diminish, but cool temperatures were likely to persist. Frost and freeze advisories remained in effect for parts of the Northeast as overnight lows were likely to range in the mid-20s to mid-30s, and daytime highs in the 40s and lower 50s.
In the West, a trough of low pressure was to dip into the Pacific Northwest from a low pressure system in the Gulf of Alaska. This was expected to kick up a few scattered rain and high elevation snow showers over the Pacific Northwest, but significant precipitation was not expected. Meanwhile, the California and the Southwest were likely to remain sunny and dry as high pressure dominated.