Area Inland Whanganui and Manawatu north of Marton, also Taihape Expect 120 to 170 mm of rain. Peak rates of 10 to 20 mm/h Sunday night and Monday morning. Impact: Streams and rivers may rise rapidly. Surface flooding, slips, and difficult driving conditions possible. Chance of upgrading to a Red Warning: Moderate. Changes: The chance of upgrade for this Orange Warning has been increased to Moderate. Rainfall totals increased.