UPDATED at 4:40 PM
Tonight: Areas along and north of a line from Charles City to Prairie du Chien, WI will have rain changing to freezing rain overnight. Areas south of that line will have rain. Low: 32-38. Wind: NE 15-25 mph.
Thursday: Cloudy with a 70% chance of rain/freezing rain north of the above mention line with rain south. Chance of rain expected for all of eastern Iowa during the afternoon. High: 36-45. Wind: NE 10-15 mph.
Thursday Night: Cloudy with rain changing to snow. Light accumulation trace-2″. Low: 29-31. Wind: NW 10-15 mph.
Friday: Cloudy with a snow showers in the morning. Any snow accumulation will be a trace to 2” with the 2” closer to the IA/MN state line. High: mid-upper 30s.
Saturday: Mostly cloudy. High: upper 40s.
Sunday: Mostly cloudy and windy (SE 15-25 mph) with a 60% chance of showers/storms. High: upper 50s.
Monday: Mostly cloudy with a 30% chance of showers. High: mid 50s.
Tuesday: Mostly cloudy with a 20% chance of showers. High: low 50s.
Wednesday: Mostly cloudy with at 20% chance of showers. High: near 50.
You probably will not like the forecast I am about to talk about since it does not include warm weather or any sunshine. Freezing rain and snow are not the most popular words this time of year.
The surface low is located near St. Louis with the upper level low is over Colorado and Nebraska (see map below).
Rain continues to stream northeast along the surface front. The position of the surface low will not move much tonight. Another 0.50 to 1.5” of rain is possible through Thursday. A FLASH FLOOD WATCH remains in effect through Thursday.
Areas along and north of a line from Charles City to Prairie du Chien, WI will see rain change to freezing rain late tonight into Thursday morning. Sleet may mix in at times. The roads will be slick with ice accumulation less than 0.10”. The map below shows the chance of 0.10” of ice or more tonight.
A FREEZING RAIN ADVISORY (purple) is in effect tonight through Thursday morning for our northern counties A WINTER WEATHER ADVISORY (tan color) is in effect tonight through Thursday morning. The dark purple color on the map is an Ice Storm Warning and the pink is a Winter Storm Warning.
As temperatures warm up above freezing, by mid to late morning Thursday, any precipitation that falls will transition back to light rain. Areas south of Highway 20 tonight through Thursday will be just rain.
The upper level low will move east and be over Iowa Thursday night cooling the upper atmosphere to the surface changing the light rain to light snow/flurries. There is a chance of light snow accumulation by mid morning Friday. Areas north of Highway 20 will see 0.5 to 1 or 2”. Areas south of Highway 20 will see less of 0.5” if any accumulation. Here is the snow forecast from the WSI RPM model.
Here is another look at the chance of 1”+ snow from the WPC for Thursday night.
High pressure will keep the weather dry Saturday, but there will be more clouds than sun. High temperatures will remain below normal as with readings only in the 40s.
We are tracking another area of low pressure to impact us with showers and thunderstorms Sunday. A strong southeast wind ahead of the low will push highs into the upper 50s during the afternoon.
Monday through Wednesday will remain mostly cloudy with chances of showers each day. High temperatures during this stretch will be in the low 50s.
Posted under Forecast Discussion
This post was written by Schnack on April 10, 2013