tag:blogger.com,1999:blog-33386160.post2845889754553387954..comments2024-02-25T19:29:38.176-06:00Comments on Rob's Blog: Lake effect rainbands affecting Winnipeg and areaUnknownnoreply@blogger.comBlogger3125tag:blogger.com,1999:blog-33386160.post-19585065583428873792007-09-15T00:18:00.000-05:002007-09-15T00:18:00.000-05:00Note also that the station at East St Paul dropped...Note also that the station at East St Paul dropped to -0.9C last night.. so the Winnipeg airport is probably fairly representative for areas outside the perimeter especially to the north. Inside the perimeter, it's a different story, and the urban heat island effect makes a big difference to temperatures inside the city core which is well sampled by the EC station at the Forks. Everyone else in Winnipeg is usually in between those two extremes (downtown and airport). So you're right Daniel, just taking values from the Winnipeg airport doesn't tell the true story for Winnipeg area minimum temperatures as clearly demonstrated by our growing mesonet of personal weather stations in the area. <BR/><BR/>I've also noted that in light southerly flows, my station in Charleswood will be a degree or two colder than the airport because of open fields just to my south. So open rural fields have a large impact on minimum temperatures depending on the wind direction.robhttps://www.blogger.com/profile/01577519556216420480noreply@blogger.comtag:blogger.com,1999:blog-33386160.post-38250781216542787892007-09-14T19:08:00.000-05:002007-09-14T19:08:00.000-05:00Hi Daniel, I agree that often the Winnipeg airport...Hi Daniel, I agree that often the Winnipeg airport temp isn't very representative of the actual temperature in the area especially on nights with good radiational cooling as the airport seems to get a good few degrees cooler than most other wx stations around Winnipeg.<BR/><BR/>I live just northeast of Winnipeg in St. Andrews and I have a VP1 wx station (not online) and I am always comparing my temp readings to the other local stations. My station usually is very similar however last night I dropped to -0.4C while most others only dropped to around 1.5C. I found that kind of odd because if anything my station is usually on the warm side for overnight lows.Anonymoushttps://www.blogger.com/profile/03050793070697382867noreply@blogger.comtag:blogger.com,1999:blog-33386160.post-8354536271117218892007-09-14T12:16:00.000-05:002007-09-14T12:16:00.000-05:00The below freezing temperature at Winnipeg airport...The below freezing temperature at Winnipeg airport overnight should be taken with a large grain of salt... It appears that it was the only environment canada weather station to drop below freezing in the red river valley and interlake. <BR/><BR/>The station cleared out only briefly and yet quickly plunged due to cold air drainage effects. Most other stations likely would not have dropped below zero so quickly in that situation . <BR/><BR/>I believe the recording station should be moved to somewhere a lot more representative of what is going in the general area... maybe closer to the terminal building or where there is better cold air drainage. Does 'NavCanada' have guidelines/regulations etc that would make that difficult?<BR/><BR/>There are obvious agricultural and horticultural impacts on where the recording station is located. The growing season maybe underestimated for all ares surrounding Winnipeg and the mean annual minimum temperatures may be too low. The latter is used to determine what trees can be planted by the city along streets etc.<BR/><BR/>It should also be noted that cities like Ottawa, have their 'official' recording station heavily influenced by urban effects. Therefore, how can one compare climate data between Winnipeg and Ottawa objectively?<BR/><BR/>Anyways looks like tonite we should escape sub zero temperatures as a return southerly flow gets going ... unless we quickly spike down in the early evening with a lingering northwest flow.<BR/><BR/>DanielAnonymousnoreply@blogger.com