GOES-10 Science Test
Weather Synopsis - 12 April/12UTC to 13 April/12UTC 1998

Synoptic Situation:

A broad trough of low pressure aloft covered the western half of the US, with an embedded shortwave approaching the Pacific Northwest. A ridge of high pressure aloft was located over the Ohio Valley into the Great Lakes region, while a weakening trough persisted off the East Coast. The jet stream was located across the southern tier of states, with a 130-150 knot core over the Southwest.

At the surface, a well-developed low was moving from the eastern Dakotas into northern Minnesota. A trailing cold front stretched southward into a secondary low over Kansas. High pressure covered the Eastern US. A low was approaching the Pacific Northwest.

Weather Conditions:

Strong convection developed from the central Plains to the Great Lakes region. Large hail was reported in Iowa (up to 1.75 inch in diameter), Nebraska( up to 1.0 inch) and Missouri (up to 0.75 inch), while damaging winds were observed across parts of Iowa (gusts up to 59 knots), Nebraska (gusts to 52 knots) and Wisconsin.

Precipitation was widespread across the West Coast, Rockies, northern Plains, Mississippi Valley, and Great Lakes regions. Amounts were generally light, but some stations reported 0.25-0.50 inch in northern California, the Great Basin, and the northern Plains.