tag:blogger.com,1999:blog-33386160.post435284209358935240..comments2024-02-25T19:29:38.176-06:00Comments on Rob's Blog: Risk of freezing rain overnight in Winnipeg/Red River valleyUnknownnoreply@blogger.comBlogger10125tag:blogger.com,1999:blog-33386160.post-53243364854078837222011-02-04T12:41:41.847-06:002011-02-04T12:41:41.847-06:00Ignore the precipitation readings from my weather ...Ignore the precipitation readings from my weather station today.. that's just snowmelt from left over snow in the gauge. One of the side effects from our springlike temperatures!robhttps://www.blogger.com/profile/01577519556216420480noreply@blogger.comtag:blogger.com,1999:blog-33386160.post-63546503443153592772011-02-04T11:46:10.397-06:002011-02-04T11:46:10.397-06:002.5mm of rain/freezing rain/snow in Steinbach. Roa...2.5mm of rain/freezing rain/snow in Steinbach. Roads in town aren't bad at all, but highways are probably not that great.Scotthttps://www.blogger.com/profile/10378918135776009197noreply@blogger.comtag:blogger.com,1999:blog-33386160.post-55007521252161698952011-02-04T07:57:06.739-06:002011-02-04T07:57:06.739-06:00Picked up 1.6 mm of freezing rain overnight. Very ...Picked up 1.6 mm of freezing rain overnight. Very slippery out there this morning on walkways and untreated surfaces. Several highway closures this morning due to ice including Trans Canada to Virden and Hwy 75 right to the US border..robhttps://www.blogger.com/profile/01577519556216420480noreply@blogger.comtag:blogger.com,1999:blog-33386160.post-13560501678699002952011-02-03T23:49:22.870-06:002011-02-03T23:49:22.870-06:00Very heavy radar returns heading toward Winnipeg! ...Very heavy radar returns heading toward Winnipeg! Will be interesting to see what falls but looking at the temperature well below freezing could be a heavy freezing rain for a bit!daniel Pnoreply@blogger.comtag:blogger.com,1999:blog-33386160.post-86635794762696154212011-02-03T23:25:38.353-06:002011-02-03T23:25:38.353-06:00Freezing rain at Brandon as of 11 pm.. and suppos...Freezing rain at Brandon as of 11 pm.. and supposedly at Winnipeg as well, although nothing is falling here that I can see, and radar shows nothing over us at the moment.robhttps://www.blogger.com/profile/01577519556216420480noreply@blogger.comtag:blogger.com,1999:blog-33386160.post-77276460408007156162011-02-03T23:19:04.465-06:002011-02-03T23:19:04.465-06:00Click on the link see the RUC upper air sounding f...Click on the link see the RUC upper air sounding for Winnipeg valid for midnight. Note the extensive above freezing layer from just above the surface to 800 mb. That would support freezing rain.. or ice pellets if the cold air near the ground is deep enough, which the RUC also shows as a possibility over the next few hours. There's also a chance that the above freezing layer will shrink (go to freezing) with the onset of pcpn, which could change the pcpn to snow. <br /><br />Will be interesting to see what form the pcpn comes in for Winnipeg. Could be a messy mix of all three at one point or another..06z YWG soundinghttp://www.twisterdata.com/data/tmp/scratch/models/processing/RUC_255_2011020404_F02_50.0000N_97.0000W.pngnoreply@blogger.comtag:blogger.com,1999:blog-33386160.post-16912786042495193292011-02-03T22:56:39.513-06:002011-02-03T22:56:39.513-06:00daniel..
It has to do with the temperature profil...daniel..<br /><br />It has to do with the temperature profile in the lower layers of the atmosphere. First of all, you need a layer of above freezing air aloft to get rain to start falling towards the surface. If the air is above freezing all the way to the ground, then the pcpn will fall as rain. If the air near the surface is near or below freezing, then that rain will freeze on contact resulting in freezing rain. If the layer of cold air near the surface is deep enough (below freezing) the the rain drops will freeze into ice pellets (sleet) before they reach the ground. So the depth of the cold air near the surface under a layer of warm air aloft will determine whether you get rain, freezing rain or ice pellets (sleet). <br /><br />Wet snow is the opposite of freezing rain. With wet snow, there is no layer of above freezing air aloft, so the pcpn falls as snow. However, if the surface temperature is above freezing, then the snow will fall as melting snow. So in this case, the warm air is near the ground, while it's colder aloft. <br /><br />Hope that's not too confusing for you.. If so, google "freezing rain" and I'm sure you'll find some good info with diagrams to explain things a little clearer.robhttps://www.blogger.com/profile/01577519556216420480noreply@blogger.comtag:blogger.com,1999:blog-33386160.post-26449785920868441302011-02-03T22:34:44.738-06:002011-02-03T22:34:44.738-06:00Can someone explain what will determine if the pre...Can someone explain what will determine if the precip. is freezing rain as opposed to sleet or wet flurries???daniel Pnoreply@blogger.comtag:blogger.com,1999:blog-33386160.post-30438560762314556422011-02-03T22:34:17.738-06:002011-02-03T22:34:17.738-06:00Yes indeed.. in fact, some brighter returns alread...Yes indeed.. in fact, some brighter returns already showing up west of Lake Manitoba west to Roblin into eastern SK. Currently raining in Dauphin and Yorkton, and moving quickly southeast towards Winnipeg. Should be here by midnight or so.. with a couple mm of freezing rain possible before our temps rise above zero.robhttps://www.blogger.com/profile/01577519556216420480noreply@blogger.comtag:blogger.com,1999:blog-33386160.post-43828251982241750572011-02-03T22:11:14.169-06:002011-02-03T22:11:14.169-06:00This weather system is really moving along a good ...This weather system is really moving along a good clip!<br />Now that we are in snow mode will rain show up as very "bright" returns on the radar???daniel Pnoreply@blogger.com