Iowa Weather Report September 22nd 2013 – Iowa Weather Network Archives

[youtube=http://www.youtube.com/watch?v=xAXtnrJu_dQ&w=480&h=360]

BEGINNINGS OF FALL: Fall begins this afternoon with plenty of sunshine with readings in the upper 60s through the 70s. A storm system will clip the state late on Monday into early Tuesday with an isolated shower and thunderstorm chance mainly in the northwestern quarter to third of the state. The rest of the state remains quiet outside of a few more clouds around. Readings Monday remain in the 70s with a slow warming heading further into the work week ahead of another storm that approaches toward the end of the week.

NEXT SYSTEM: The next storm system to move into the state will be late Thursday night into Friday with a threat of showers and thunderstorms at that time. This run does move slower with the system however with Saturday looking very wet. Most of the heaviest rainfall looks to occur during the morning hours before lightening up through the day. The system looks to clear out during the evening hours with only some rain confined to the eastern counties during that time. Sunday will see plenty of sunshine (outside the morning clouds that may linger in the eastern counties) with temperatures cooling back down into the 60s and lower 70s for highs.

GETTING INTO OCTOBER: After the system moves through next weekend, the storm track shifts north again as a ridge builds across the western part of the country. This will keep the state dry for the first few days of the month. Then the GFS pulls a fast one with a cold front crashing through late on the 4th into the 5th of October. This run also shows the 540 line dropping almost to the Ohio River. This would bring MUCH colder weather especially on Saturday in the eastern half of the state, with the chance of a cold rain Friday night (the 4th) into Saturday morning (the 5th). Areas to our east could see a wintry mix during the morning before changing to all rain if this pans out. The system spins its way to the east and temperatures quickly moderate back to near seasonal levels at the end of the period. Since this is the first time we’ve seen this surprise, we’ll have to wait for other runs to verify this turn of events that could come for the first weekend of October. In other words, welcome to Fall in the Midwest.