Bradley Smith will lead the grid for the Estoril 125cc race, which will be formed on combined practice times due to the downpours at the Portuguese track forcing the cancellation of qualifying.
Aspar Aprilia rider Smith was one of many 125cc riders to crash in the three wet practice sessions - but he was also quickest in both practice one and practice three, with his Friday morning time giving him pole.
Smith got that lap in just before the rain increased, so finds himself with a vast 2.4-second pole margin over British countryman Danny Webb.
Second is Webb's best 125cc starting position yet, with his Cajasol Aprilia team-mate Alberto Moncayo also achieving a career high with third. The rookie was quickest of all on Friday afternoon.
All three championship contenders have had crashes during the build-up, and Marc Marquez's cautious approach to practice left the points leader with 11th place. His main rival Nico Terol will start fourth, while fellow title combatant Pol Espargaro is alongside Marquez in 12th.
Sandro Cortese, Marcel Schrotter, Tomoyoshi Koyama and Luis Salom fill row two, while Lorenzo Savadori takes his best qualifying position yet in ninth and Danny Kent gets the Lambretta into the top 10 for the first time in 10th, despite two practice crashes.