The risk of torrential downpours is in the offing for Churchill Downs as we move closer to the 138th Annual Kentucky Derby.
The Louisville area remained in a zone of midsummer warmth much of this week with high temperatures well into the 80s to near 90.
However, it appears drenching downpours and locally gusty thunderstorms are about to make their move with the potential for muddy conditions at race time.
The warmth and humidity have made the atmosphere ripe and capable of unleashing torrential downpours.
**During the middle of the afternoon, severe thunderstorms were approaching Louisville, prior to the start of the Kentucky Oaks.**
This is the current radar, centered on Louisville, Ky.
Around Louisville, the greatest risk of repeating downpours and locally gusty thunderstorms with hail and frequent lightning will come late today into Saturday midday as one or more disturbances roll in from the Plains along a southward sagging front.
While rainfall with summer weather showers and thunderstorms is often chaotic, there is the potential for 1 to 3 inches of rain at the local level during this period.
Essentially, if the Louisville gets under the "sweet spot" of the storms, it can be clobbered with flooding downpours.
According to the Louisville National Weather Service, it has rained on 63 of the 137 Derby Days (46 percent). The wettest day was May 11, 1918, when 2.31 inches of rain fell.
Indications are that the core of the rainfall will tend to shift to the south of the area during the afternoon and evening Saturday. However, there can still be stray storms and downpours left behind the main mess.
Because of the extent of the clouds, showers and thunderstorms around during the first part of the day Saturday and breaks of sun later in the afternoon, we expect temperatures to rebound into the middle 80s for the run for the roses.
The position of the front and the zone of showers and thunderstorms will be critical for timing the rain in the Louisville area and throughout the Ohio Valley. Keep checking in at AccuWeather.com for the latest forecast and radar.
This story was originally published at 10:00 a.m. CDT Thursday, May 3, 2012, and has been updated.
Ahead of an approaching storm system, unseasonable warmth will overspread much of the United Kingdom on Sunday and Monday.
With no exact details on where Malaysia Airlines Flight 370 went missing, Indian Ocean currents may have swept one piece of the complicated puzzle to shores on Reunion Island.
The stream of moisture into the Southwest is drying out some, so this weekend may not be as wet as the previous few days.
Life-threatening heavy rainfall will continue to focus on northeastern India, Bangladesh and western Myanmar into Monday before a drier weather pattern sets in.
Heat and humidity remained in control over the much of the country during the last week of July.
The air felt like an exceptional 163 F in Bandar Mahshahr, Iran, on Friday and similar or worse conditions will follow.
1,178 "reported" tornadoes with 120 killed so far this year. Number of "actual" tornadoes probably less, but this is still one of the most active years ever (nearly half of the fatalities occurred in the Carolina outbreak of March 28th).
Los Angeles, CA (1991)
New July rainfall record of 0.17" established. The previous record was 0.15" set in July 1969.
Mansfield, OH (1992)
13.23" of rain in July -- wettest month on record.