From a press release issued by Mat Mladin Motorsports:

2003 AMA Chevy Trucks US Superbike Championship
Rounds 4 & 5 – Infineon Raceway, Sonoma, California, USA
Opening Qualifying Session Report


RAIN HALTS AMERICAN SUPERBIKE QUALIFYING AT INFINEON RACEWAY


Sonoma, California, USA – Continued rain showers throughout the day have forced race officials to call a halt to practice and qualifying sessions for the AMA Chevy Trucks US Superbike Championship round being held at Infineon Raceway (formerly known as Sears Point) today.

Rain fell periodically throughout the day, with only three classes being able to take to the circuit, (Formula Xtreme, Supersport and 250 Grand Prix) before more showers put an early end to each of those sessions.

Three-times American Superbike champion and current championship points leader Mat Mladin, did take to the circuit during the Formula Xtreme practice session aboard his Yoshimura Suzuki GSX-R1000, only doing enough laps to familiarise himself with the conditions. No Superbike practice or qualifying took place today.

Weather conditions are expected to remain the same tomorrow (Saturday), before clearing on Sunday and Monday.

The disruption to the program will mean that the Superbike competitors will only have tomorrow morning’s qualifying session to set their best times before the first of two 18-lap Superbike nationals are held later in the afternoon, weather permitting.

If conditions remain wet tomorrow, race officials will reschedule the events for Sunday, and possibly Monday.

Mladin arrived at this weekend’s round of the championship fresh from a double victory at the previous round at California Speedway and leads the points chase with a total of 100, eight points clear of Honda’s Miguel DuHamel.

Proposed Saturday Schedule

8:00-9:40 a.m., Practice (All classes)
9:45-10:05 a.m., Superstock Qualifying, Even #s
10:10-10:30 a.m., Superstock Qualifying, Odd #s
10:40-11:10 a.m., Superbike Qualifying
11:20-11:40 a.m., Supersport Qualifying, Even #s
11:50-12:10 a.m., Supersport Qualifying, Odd #s
12:10-12:40, Lunch
12:40-1:00 p.m., Superbike Practice
2:00 p.m., Superbike race, 18 laps,
followed by 250cc GP Qualifying, followed by Superstock race, 17 laps.

2003 AMA Chevy Trucks US Superbike Championship (points after 3 of 18
rounds)
1. M Mladin 100; 2. M DuHamel 92; 3. B Bostrom 87; 4. A Yates 86; 5. E
Bostrom 85; 6. K Roberts 81; 7. S Higbee 64; 8. A Deathridge 60; 9. V
Haskovec 55; 10. L Pegram 51.