On Sunday, August 27th, the final rainfall event of the month occurred in the mid to late morning hours, as an upper level disturbance from the northwest pushed across the region. Localized areas received some heavy precipitation, especially, once again, in the KC Metro area. Lawrence received, on average, a bit more than half an inch.
An upper trough of low pressure (dashed line) swings through the local area Sunday morning. Tropical Storm Harvey was centered inland just north of Corpus Christi. Harvey had come to a standstill, the storm’s advance thwarted by an opposite northwesterly flow aloft. The northwest upper flow over our area was itself a response to a strong ridge of high pressure aloft centered over the inter-mountain west. The western ridge marked the beginning of yet another heat wave out west and intensifying fire weather conditions.
5:15 AM – System mostly over Nebraska, heading southeastward. Clouds from the circulation around Tropical Storm Harvey to the south.
Topeka Radar Precipitation Accumulation for the day.
Kansas City Radar Display for the day: A swath of heavy rain is confirmed across the core of the KC Metro from eastern Wyandotte County, KS into Clay County, MO. Key: Dark Blue 0.3+. Light Green 0.5+. Medium Green 0.8+. Dark Green 1.0+. Yellow 1.3+. Tan 1.5+. Brown 1.8+. Red 2.0+.
CoCoRaHS Precipitation Maps follow..
The 7-Station Lawrence average was 0.59 inches, as a bit of new convection developed over the area ahead of the dying nocturnal system. The Lawrence Airport came in with a low outlier amount of 0.28 inches. Extrapolation between the closest Lawrence CoCoRaHS site (0.51) and a CoCoRaHS site in Leavenworth County just north of the I-70 Lawrence Service Center (0.46), is 0.48 inches. Could the 0.28 inch reported amount at the airport be accurate? Yes, the NWS Kansas City radar precipitation estimate (magnified above) shows a hint of that possibility. However, given the recent history for the automated rain gauge at the airport, the ‘official Lawrence rainfall’ is once again rather suspect.
Topeka area amounts. Only 0.07 at the Topeka Airport. Forbes Field came in missing. It likely has the same type of automated gauge as the Lawrence Airport.
KCK – Johnson County Executive came with with 0.47 while Olathe New Century came in with 0.19 inches. Note the locally heavier amounts in Overland Park (arrow).
KC, MO – Local area of very heavy rain in southern Clay County. The downtown airport (MKC) came in with an impressive 2.04 inches, while KCI (MCI) came in with 0.54 inches.
9:51 AM – Raining in the neighborhood!
6:33 PM – At the Arboretum. The wild prairie grass appears invigorated.
7:09 PM – Last gasp clouds at sunset.