Overnight Storms

A few showers and storms have recently developed in southwest Iowa. The outlined area is where more showers/storms are forecast to develop and move east tonight. Heavy rain and gusty wind can be expected with any of the storms.

The map below is a surface map showing the position of the warm front, in the SW corner of Iowa. It is forecast to move northeast overnight.

The low level jet is starting to get stronger and will help feed the storms.

The low level jet stronger later tonight according to the map below. The winds are from the southwest.

The map below shows the storms in SW Iowa developing and moving into central and eastern Iowa later tonight. The map below shows what the radar might look like around 2 AM Saturday.

Hopefully the storms stay below severe limits (58 mph). The storms are forecast to move out of the area as the sun comes up. A few showers might linger until noon. More storms could redevelop across eastern in the afternoon and evening. Again, heavy rain will be the primary concern.

There is a 70% chance of storms across our area for the rest of the night.


Posted under Update

This post was written by Schnack on August 31, 2018

Dry air over eastern Iowa

The sounding in eastern Iowa shows a lot of dry air in place. The rain in central Iowa is drying up as it moves into the dry air.

The humidity level increases Thursday evening and is humid Friday through the weekend.



Posted under Update

This post was written by Schnack on June 13, 2018

Winter Storm Update

Quiet weather tonight with a partly cloudy sky and a light wind. The wind increases from the east Friday as we wait for the winter storm to arrive late in the day. Temperatures warm into the upper 40s in the afternoon. Rain arrives late in the afternoon southwest of I-380. As the moisture spreads northeast the temperatures will begin to drop with a changeover to snow by midnight for areas north of Iowa City. A strong east wind will have gusts to 35 mph Friday night and Saturday morning.

Snow continues Saturday morning and begins to taper off early in the afternoon. Snow accumulations across much of eastern Iowa will be 4-7”. Isolated higher amounts (8” or 9”) are possible in a narrow band from New Hampton to Oelwein to Monticello. Areas south of Iowa City, snow amounts are less than 2”.

Travel will be hazardous late Friday night through early Saturday afternoon. Heavy snow and reduced visibility due to the blowing snow. Allow extra time to get to your destination if you must travel. It will be a heavy wet snow. Use caution when shoveling it.

Sunday is dry and breezy with highs in the 30s.

We are tracking another storm forecast to bring rain to the area Monday afternoon through Tuesday morning. Temperatures are forecast to remain warm enough to keep this mostly rain. There is a slight chance light snow might get mixed in late Monday night. No snow accumulations is expected at this time.


Posted under Update, Winter Weather

This post was written by Schnack on March 22, 2018

Snow to start the weekend

We are tracking a storm forecast to bring heavy, wet snow to eastern Iowa Friday night into Saturday. In addition to the snow it will be windy with an east wind gusting to 30 or 35 mph. It will start as a rain snow mix Friday evening and quickly change over to snow by midnight. Snow continues through the night and into Saturday before tapering off by noon Saturday. Winter Storm Watches are posted for parts of Minnesota and northwest. Winter storm watches are likely to be issued as early as Thursday morning to extend southeast into eastern Iowa.

The map below shows the snow potential of 4″ or more across northeast Iowa pretty high for Friday night and Saturday morning.


Posted under Update, Winter Weather

This post was written by Schnack on March 21, 2018

High Clouds

High clouds to our west move into Iowa later tonight and Friday morning.

The sunny sky today and clear sky this evening is associated with the high pressure system over Iowa. The higher clouds are in association with the warm to our west.




Posted under Update

This post was written by Schnack on March 8, 2018

Scattered Snow Showers

Scattered snow showers continue tonight across eastern Iowa. The wind is light overnight as temperatures drop into the upper 20s. Roads will be slick. Remember, many locations had freezing rain before the snow started to accumulate. So when shoveling remember there might be ice under the snow.

A wintry mix of snow and sleet is expected on and off through Tuesday with snow accumulations from Monday night and Tuesday to be a trace to 2” across all of eastern Iowa (higher amounts north). The wind increases in the afternoon from the north at 10-20 mph. Tuesday night is mostly cloudy with the wind a bit stronger…NW 15-25 mph.

Wednesday remains breezy with a mix of sun and clouds. High only warm to near 30 degrees. Thursday is dry with a mostly sunny sky. There is a slight chance of light snow Friday and Saturday.


Posted under Update

This post was written by Schnack on March 5, 2018

Rain and some snow

We are tracking a storm forecast to move across Missouri Wednesday night. Rain develops across southern Iowa Wednesday evening and spreads north overnight. As the low moves east colder air wraps in and changes the some of the rain to light snow before it ends early Thursday morning. Little to no snow accumulation is expected. The sky becomes mostly sunny by the afternoon with a gusty northwest wind to 30 or 35 mph. Thursday will be the coldest day of the next seven with highs in the upper 30s. Highs return close to 50 this weekend.


Posted under Update

This post was written by Schnack on February 27, 2018

Freezing Rain, Dense Fog and Rain Tonight

There is a wide range of weather across eastern Iowa tonight and into Tuesday morning.

Here is a look at the road temperatures this evening. The temperatures in central Iowa are dropping. Watch out for slick conditions on elevated surfaces. They will freeze faster.

Northwest of a line from Tama to Elkader tonight and Tuesday:
Areas of fog will thin out as freezing rain develops after midnight. The freezing rain tapers off around 9 AM Tuesday. Ice accumulation will be 0.10-0.25”. Use caution walking and driving Tuesday morning due to the ice. Highs Tuesday remain below freezing so ice will not melt much.

Southeast of a line from Tama to Elkader tonight and Tuesday:
Areas of dense fog is expected through the night and into Tuesday morning. Rain becomes widespread after midnight. Temperatures are in the mid 30s, so no freezing rain is expected. Fog thins Tuesday morning with more rain possible until early afternoon. Highs are near 40 degrees.

Here is the timing of the rain/freezing rain tonight and Tuesday morning.

For all of eastern Iowa…
Tuesday night the wind increases from the northwest at 10-20 mph under a mostly cloudy sky. The sun comes back out Wednesday with highs in the 20s.

We are tracking some more active weather for Thursday through Saturday with scattered rain/snow chances each day.


Posted under Fog, Ice, Update, Winter Weather

This post was written by Schnack on February 19, 2018

Friday evening weather

We are tracking a cold front this evening crossing over the US/Canadian border as it moves southeast. The cold front will cross eastern Iowa Saturday morning with a chance for light snow. Any snow accumulation will be a trace to 1″.

The chart below shows the vertical profile of the atmosphere over eastern Iowa. The red line represents the temperature and the green line represents the dew point. When they are far apart, like they are in this chart this evening, it indicates a dry atmosphere. The atmosphere needs to become saturated before we get any snow. If it stays dry, the chance of snow and any snow accumulations would lower than the trace to 1″ forecast.

The map below is the temperatures Friday evening. I circled the area with the coldest temps across the lower 48 states. It just happens to be over Iowa, Illinois, Minnesota and Wisconsin. Warmer air moves into the area tomorrow and Sunday.


Posted under Update

This post was written by Schnack on February 16, 2018

Winter Storm Update


Snow tonight will be heavy at times. The roads will be slick tonight through Saturday morning. Slow down on snow covered roads if you travel. The wind increases late tonight from the northeast at 10-20 mph causing blowing and drifting snow through Friday. The wind diminishes Friday night.

Snow tapers off in the early Friday morning. A few light snow showers or flurries might linger to noon Friday. Snow total of 2-5” north of a line from Elkader to New Hampton. South of that line 5-8” are expected. Isolated higher amounts, near 10”, in east central Iowa.

Light snow or flurries are possible Friday night and Saturday with little to no additional accumulations. Saturday and Sunday are cold with highs in the teens and a light wind.


Posted under Update, Winter Weather

This post was written by Schnack on February 8, 2018