Fast wickets hand Bears advantage
Three quick wickets gave Warwickshire the upper-hand as Lancashire finished the first day 188 for six in LV= County Championship Division One.
Alex Davies, 19, hit his second successive half-century in the Championship but the teenager was part of a middle-order collapse that saw Lancashire slip from 120 for two to 126 for five.
Warwickshire's Jeetan Patel took two of those wickets and closed the day with three for 52 before rain stopped play at Edgbaston with 14 overs still to be bowled.
Earlier in the day Lancashire had won the toss and elected to bat but the visitors suffered an early setback when opener Paul Horton (12) was caught behind off Chris Wright (two for 44).
Davies was joined at the crease by Andrea Agathangelou and the pair were able to add another 78 runs before another wicket fell.
Agathangelou was the man to be dismissed as he was caught by Varun Chopra off Patel for 31 but Davies, who scored 62 against Somerset last time out, continued to show maturity beyond his years.
Lancashire looked to be in a strong position in the 41st over with the score 120 for two but the visitors soon surrendered the ascendancy.
Ashwell Prince was caught for 12 by William Porterfield off Patel and the off-break soon had Davies too, clean bowling him for 59 to take the score to 125 for four.
England's Jos Buttler, fresh from his controversial run-out by Sri Lanka last week, was unable to steady the ship and fell in the next over for a duck when he found the gloves of Tim Ambrose off Wright.
Steven Croft (30) and Tom Smith were able to ease the pressure slightly, putting on 49 runs before Croft was superbly caught and bowled by Rikki Clarke (one for 33).
Warwickshire's Keith Barker and Boyd Rankin bowled 25 overs between them and while neither was able to take a wicket, their tight spells included ten maidens and gave away only 44 runs Smith and Glen Chapple provided late resilience and were both unbeaten on 21 and nine respectively when a heavy storm saw play ended early.