GOES-10 Science Test
Weather Synopsis - 01 April/12UTC to 02 April/12UTC 1998
A closed upper level low moved from northeastern Iowa toward the Great Lakes region; a lobe of vorticity ahead of this low was lifting northeastward across Michigan. Another low over California migrated eastward across Nevada and Utah; a cold pool aloft contributed to steep lapse rates beneath this system. A strong (130 to 160 knot) jet continued from northern Mexico across the Gulf coast states.
At the surface, an occluded low over Minnesota/Wisconsin drifted slowly northeastward, with an occluded/stationary front stretching eastward across the Great Lakes into New England; an associated cold front moved eastward across the Appalachians toward the East Coast. A moist air mass continued ahead of the cold front, with dew points from 60-70 F and precipitable water values exceeding 1.0 inches. In the West, a low and it's attendant cold front moved eastward across the Southwest and Intermountain region.
Strong convection developed along and ahead of the cold front as it approached the East Coast. Several tornadoes were reported in Virginia (2 fatalities), North Carolina, and Pennsylvania. Hail up to 1.75 inches in diameter, wind damage, and minor flooding also accompanied these storms from North Carolina to New Jersey.
Low-topped convection across Michigan and Indiana produced reports of wind damage in those states.
With the eastern U.S. system, rainfall was observed across much of the Great Lakes and Ohio Valley regions, and along much of the East Coast. Up to 1-2 inches of rain were recorded in parts of the mid-Atlantic region and New England. Newark, New Jersey received 1.65 inches of rain, a record for the date (01 April). Some light snow (1-5 inch totals) fell across eastern South Dakota, southern Minnesota, and the upper peninsula of Michigan.
The western U.S. system produced rainfall across the Southwest and Intermountain region, with 0.5 - 1.0 inch totals along the California coast. Tucson, Arizona reported 0.35 inches of rain, a record for the date (02 April). Snow was reported in the higher elevations of the Sierras, and across the southern and central Rockies (amounts less than 12 inches).