Thundery showers are set to be around Aintree Racecourse in Liverpool, England, on Saturday afternoon after a mostly dry Ladies Day.
After rain and gusty winds on Friday night, Saturday will yield mix of cloud and sun for Grand National Day on Saturday.
The day will start dry, but a couple of thundery showers will develop in the afternoon. Spectators and racers will want to seek shelter as soon as thunder is heard to avoid being struck by lightning.
A thundery shower threatens to be around Aintree Racecourse for the start of the Grand National at 17:15 BST. Otherwise, sunny intervals are expected.
"Since the rain into Saturday will not be heavy, the racing surface should not be extremely soggy," AccuWeather Senior Meteorologist Kristina Pydynowski said. "However, it can be soft for the Grand National, especially if a thundery shower occurs immediately before or during the race."
The temperature at the start of the race will be near 9 C (48 F). Winds will average 6-12 mph (10-20 km/h).
"Aintree Racecourse will host over 150,000 racegoers [Thursday to Saturday], while an estimated worldwide audience of 600 million people will tune in to see the Grand National live on television on Saturday," stated the Grand National official website.
The prospects of a thundery shower on Saturday come after a mostly dry day graced Ladies Day.
Aside from an odd shower in the morning and a little rain toward day's end, Friday featured sunny intervals, comfortable temperatures and a breeze at times. Spectators did not have to worry about accessorizing their fashionable outfits for Ladies Day with umbrellas, heavier jackets or wellies.
The ladies entering out Style Award are looking very glamorous! #FabulousFriday gallery: https://t.co/PZk2k1Rfc9 pic.twitter.com/OwqWS8ZvsM— Aintree Racecourse (@AintreeRaces) April 8, 2016
Lets win some money!!!!! #Aintree #FabulousFriday #LadiesDay pic.twitter.com/VEu475fkdA— Michael Griffiths (@M__Griffiths) April 8, 2016
Friday's weather was in stark contrast to the stiff winds and frequent showers that dominated Grand Opening Day. Regardless, a record crowd of 35,581 still packed Aintree Racecourse on Thursday, according to the Crabbie's Grand National website. The previous record was 34,752 from 2015.
Temperatures on Friday rose only slightly above Thursday's high. However, the sunny spells and lack of wind made the day feel even milder.
Sunshine will replace the chance for thundery showers around Liverpool to end the weekend on Sunday. The dry spell will not last long with showers set to make a nearly daily appearance next week.