Through the day on Friday April, 26th, a short wave upper level trough of low pressure slowly shifted eastward across the central plains. In response, a deepening surface low pressure center developed over the panhandles with an associated frontal boundary extending from the panhandles east/northeastward through Kansas into western Missouri. Through noon, this surface low began to sink southward, dragging the frontal boundary along with it. Ahead of this front, southerly surface winds continued to transport a decent amount of moisture into the region. As instability slowly increased, a well developed cumulus field formed along the eastern Texas panhandle into far southwestern Kansas.
Late in the afternoon, storms began to develop within the cumulus field and slowly moved eastward with the progression of the front into far western Oklahoma through 5 pm. For the next 8 hours, very strong to severe thunderstorms developed along this front as it pushed slowly southward across the state. These storms produced numerous reports of golf ball sized hail and winds of 60 mph. Late in the evening, storms entered the OKC metro, dropping not only golf ball or larger hail, but excessive amounts of pea to quarter sized hail, with reports of hail covering roadways. These storms also produced another amount of decent rainfall. With preliminary measurements of 1 inch in the OKC metro area, to near 2 inches across portions of south central Oklahoma, from Chickasha to Ada. With such a heavy burst of rainfall in Chickasha through the Metro, a few flash flood reports were reported with these storms.
There were also reports of significant wind damage within the town of Anadarko. A storm survey crew was able to determine that the damage was caused by 70 to 80 mph rear flank downdraft (RFD) winds. There were also reports of powerlines and large treelimbs down in the Stratford area as well, also caused by straight line winds. Click here or on the storm report map tab at the top for a detailed list of storm reports collected from the event.
Details are continuing to be sorted out and this page will continue to be updated over the coming days.
More weather information (storm reports, weather maps, soundings, etc.) about this day can be found at this link: http://www.spc.noaa.gov/exper/archive/event.php?date=20130426