Commercial Fixed Wing
Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
Ground Event / Encounter Weather / Turbulence; Ground Event / Encounter Loss Of Aircraft Control; No Specific Anomaly Occurred Unwanted Situation
General Flight Cancelled / Delayed
Weather; Airport
We landed in ZZZ with a Code 2 braking report. DOT had done a superb job of plowing and sanding the runway resulting in an actual braking action of at least Medium. It continued to snow during our approximate 30 minute turn while DOT continued to plow the runway. DOT stopped plowing when we commenced deicing. After our deicing and engine starts we commenced taxiing. Upon turning onto the runway the jet slid sideways across the runway. After correcting the slide I made a second turn onto the center line; experiencing a second slide. I determined Braking Action to be Nil. I set the parking brake and called DOT informing them we needed a complete plow and sanding of the runway. This took approximately 20 minutes. After DOT completed their work and issued a Braking Action report; we departed safely without incident.Crews should remain vigilant and remember Braking action changes rapidly with heavy snow.
Air Carrier Captain reports runway braking action is nil prior to takeoff.