With only a few days left of June, thoughts are turning to the 4th of July holiday, getting those summer vacations taken care of before school starts back, and pre season football practice starting up.
June will finish as one of the wettest on record, and coming on the heels of a very dry May, we’re actually right where we should be from a year-to-date precipitation perspective.
Here are some highlights we’re focusing in on that’ll impact our July weather:
- Highly amplified MJO
- Very wet June through the Mid West/ Ohio Valley
- Warm water off the East Coast
- Persistent western ridging
June will finish as a top 5-10 wettest June on record for many communities throughout our immediate region. With the wet conditions, it’s very tough to get any sort of long-lasting truly hot weather and while we’re certain to have plenty of warm, humid days during the upcoming four weeks (it is July, after all), we don’t anticipate any sort of significant heat wave. We fully expect being able to save on cooling costs when compared to normal. 
We also note a highly amplified MJO, or Madden-Julian oscillation.
In July, phases 6-7 are cool signals for our region.
We note sea surface temperatures are quite warm off the eastern seaboard and in the Gulf of Mexico. While this doesn’t have a direct impact on our weather here in regards to temperature, it can suggest some southeast and eastern ridging at times. When we look at the upper air pattern below, we note the region will likely be in between predominant ridge positions east and west for July. The end result for our particular part of the country would be a cooler and continued unsettled time of things for the better part of July.
*As a side note, this sort of water profile does “raise an eyebrow” for potential tropical activity in the Gulf and potentially along the east coast, and that’s something that we’ll have to keep a close eye on as we progress into the heart of the season.
We sort through a variety of data to help build our weekly (client based) and monthly upper air charts. While we can’t share all of those forecast models here directly with you (due to licensing), a combination of GFS ensemble data, CFSv2, and European weeklies have helped us build this upper air pattern for July.
This would provide continued cooler than normal times (particularly daytime highs, considering the wet ground) and a busy time tracking cold fronts and individual disturbances that will ignite frequent showers and thunderstorms.
“Average” July weather for IND includes mid 80s for highs, mid 60s for lows, and 4.5″ of rainfall. In summary, we anticipate July 2015 to run 2-3 degrees below average and precipitation to run above normal by a couple inches. We think we just keep on rolling down the tracks from the wet and active regime put into place in June. Time will tell!