Severe Thunderstorms over the Plains, Heavy Rain Threat Continues over Portions of the Mississippi Valley
Heavy rainfall with localized flooding will remain possible over portions of the Mississippi Valley and the Plains through midweek. In addition, severe thunderstorms will be possible over the southern and central Plains. Some of the storms could contain damaging winds and large hail.
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Gridded Flash Flood Guidance (GFFG) provides a general indication of the amount of rainfall necessary to cause small streams to overflow their natural banks. During heavy rainfall, usage of this guidance must involve combination of rainfall that has already occurred plus any additional rainfall that is expected to fall over the same location, not to exceed the guidance duration (example: 1-hr or 3-hr). It should be noted that these GFFG values are based upon estimates of average soil moisture and stream flow conditions over 4km x 4km grids. GFFG values also assume that the rainfall event will be evenly distributed over the guidance duration. Flooding may occur with less rainfall than indicated in areas of very high rainfall intensities, impervious surfaces (urban areas), or steep slopes.