The eastern US may be dominated by below-normal temperatures for the next two weeks, according to forecasters.The U.S. Climate Prediction Center's eight to 14-day outlook says colder air east of the Mississippi is expected until at least April 4. Commodity Weather Group's 11 to 15-day forecast predicts the cooling will be mainly confined to the Eastern Seaboard.“The combination of significant cold air dropping southward from Canada and an aggressive series of storm systems over the next two weeks means that many areas of the Midwest and East could see late-season winter weather that would significantly diminish high temperatures,” according to CWG's daily outlook.Winter storm warnings and weather advisories stretch today from Idaho to Michigan and New York City may receive as much as an inch of snow tomorrow, according to the National Weather Service. A winter storm watch has been posted for parts of northern New Jersey.Yesterday's average temperature in New York's Central Park was 41 degrees Fahrenheit (five Celsius), or three degrees less than normal, according to the National Weather Service in Upton, New York. In Boston, the average temperature was 38, or two less than normal, and in Chicago it was 51, or 12 higher than normal, according to the weather service.In its six to ten day forecast, CWG restates its prediction that colder-than-normal temperatures are likely from the upper Midwest through Chicago to the Northeast. Warmer air may penetrate from Texas to Canada.The climate center's six to ten day forecast says the chances are greater than normal that the U.S. Northeast will be cooler than average, while the Southeast has higher-than-normal temperatures. The centre also says the Pacific Northwest has an above-average chance of cool weather.