Tonight: Mostly clear, warm and humid. Low: 72-74. Wind: S 10-15 mph.
Wednesday: AM: Increasing clouds. PM: A 60% chance of showers/storms northwestern counties and 20% chance in the southeast counties. High: 80-90. Wind: SW 10-20 mph.
Wednesday Night: Mostly cloudy with a 60% chance of showers/storms. Low: 60-64. Wind: NW 5-10 mph.
Thursday: Mostly sunny and less humid. High: low 80s.
Friday: Mostly sunny. High: low 80s.
Saturday: Partly cloudy with a 20% chance of showers/storms. High: mid 80s.
Sunday: Partly cloudy with a 20% chance of showers/storms. High: mid 80s.
Monday: Partly cloudy. High: mid 80s.
Tuesday: Partly cloudy. High: mid 80s.
You can see the International Space Station (ISS) this evening…here is the viewing information:
Time: 9:18 PM
Duration: 3 min
Travel Path: N to NE (max elevation (18 degrees)
Time: 10:55 PM
Duration: 2 min
Travel Path: N to E (max elevation (56 degrees)
We will have one more night with lows in the 70s and it will remain humid. There is a cold front I am tracking and it will bring us some relief from the heat and humidity Thursday. It will also bring a chance of showers/storms to the area. At this point, it doesn’t look like there will be any severe storms. The front is forecast to slowly move across Iowa Wednesday. Model guidance has the showers/storms only making it into our northwestern counties during the afternoon while the southeastern counties will be dry. Here is location of the front Wednesday evening.
The front will cross eastern Iowa Wednesday night with a chance of showers/storms for all of eastern Iowa. The showers will end late Wednesday night. Here is the forecast rain amount possible with the front. The map, below left, is for Tuesday evening to Wednesday evening. The map, below right, is for Wednesday evening to Thursday evening.
There might be some clouds lingering into early Thursday morning otherwise we will have a mostly sunny day. It will be cooler and less humid with a lighter wind. These conditions are all due to high pressure moving across the Midwest Thursday and Friday.
Yesterday it was looking like temperatures might warm to near 90 degrees Saturday but, that does not seem to be the case today. Yesterday, model guidance was showing the ridge to be farther east than the data shows today. The upper level ridge is a little farther west and under the ridge is the heat. The 500 mb map below is for Saturday evening.
Also do to the shift in the upper level ridge position…the surface low will track more south this weekend. The more southern track would keep the warm front across the Iowa/Missouri state line and us on the cooler side of the low. So with that in mind, high temperatures Saturday will be more in the low-mid 80 range. The low will track to our south for the weekend and bring us a slight chance of showers/storms. The map below shows the position of the low and warm front Saturday morning.
Once the low moves east of Iowa, a large area of high pressure in central Canada will stretch south into the Midwest with dry conditions Monday and Tuesday.
Posted under Astronomy, Forecast Discussion
This post was written by Schnack on June 19, 2012