Chicago Storm

It's looking increasingly possible that what once looked like a solid 6 day heat wave (Wed-Mon), could potentially end up just being one day (Fri) around here. Each day, outside of Friday, has some sort of fail potential. Tomorrow a lake breeze and associated showers and t'storms could prevent 90+. On Thursday, a weakening MCS is expected in the morning, and if it lingers could prevent 90+. Friday is a slam dunk 90+ day, and probably mid-upper 90's at that. Saturday has increasing potential to feature a frontal passage and t'storms at some point, which could also prevent 90+ potential. The much earlier frontal passage will also prevent 90+ on Sunday and Monday. The biggest change over the past several days is that guidance has really lost the decent ridge that was expected to develop and kick the jet stream north, and instead has a weaker ridge under a more zonal flow pattern. Guidance has also stepped back in the warmer UA temps being advected to the east as once advertised, which is not surprising given the first point.

92 at ORD, MDW and here today. .

94 at ORD and MDW yesterday, and 95 here. 91 at ORD, 90 MDW and 94 here today. MBY, and the western suburbs in general, have been consistently warmer that the immediate UHI the past month or so. Some days the lake has played a role, such as today, and other days not so much.

Yea, in 2012 ORD actually lead the pack many times. However, a few years ago the location of the OBS site was moved on the property. Additionally, they have finished some nearby construction, while starting other new nearby construction. Those changes are likely playing a role as well...

Per LOT.

The GFS and ECMWF are in a agreement on the potential for a string of around 90 to 90+ days starting tomorrow, through the following weekend. There are hints of some real heat late next week and the following weekend as well, with both models showing 100's as well.

There has been confirmation that the sensor is in good working order.

94 at ORD, 96 at MDW and 95 here today. Hottest temps of the year across the board.

91 at ORD and 92 at MDW today 91 here. The past week and a half will go down as a low end heat wave for portions of the area. ORD ended up with five 90+ days, and was 89'd three times. IMBY it hit 90+ all 10 days of the stretch...Being further away from the lake helped a few of the days. Day........ORD......MDW........Here 26th........89............90..............90 27th........89............90..............91 28th........90............91..............91 29th........87............87..............90 30th........91............89..............92 1st...........89............91..............90 2nd.........92............92..............94 3rd..........86............86..............90 4th..........91............91..............91 5th..........91............92..............91 ............................................................ 90+..........5..............7...............10

Hit 91 at ORD, MDW and here today. Hot and humid...Perfect 4th of July. .

92 at ORD and MDW today. 94 here, as we escaped the OFB's for a while longer. 7th consecutive 90+ day here as well.

ORD had a small storm move overhead earlier, thus the cooler temps at that point. Looks like peak temp of 91 there so far.

ORD 89'd today, while MDW hit 91. 90 here, making it the 6th consecutive 90+ day.

Decent hit today here with the first MCS. Ended up with some smaller tree branches down in the area, estimated winds up to around 60mph. Have been without power since the storms hit...Not due to the winds, but instead lighting. A tree was struck across the way, and took down a power pole and lines, and it all caught on fire. .

91 ORD and 89 MDW today. 92 here, making it the 5th consecutive 90+ day. .

87 at ORD and MDW today. The flow off the lake kept them a bit cooler. Hit 90 here, 4th 90+ day in a row. .

ORD hit 90 yesterday. Also 91 MDW and 91 here, making it the 3rd 90+ day in a row. It was a big comeback for the area after the MCS. ORD was “only” 80 at 2PM. .

No, it's definitely and issue with the sensor. It has been running behind on the warmer days recently. All OBS sites hit 90+ yesterday, except ORD.

It's not just the HRRR. All guidance has struggled badly, both yesterday and today.

89'd again today. Oh the horror.

Yep, 89'd again. MDW hit 90, and made it to 91 here.

What a day... Hit 90 for the first time this year here this afternoon. The lake breeze passed around 6PM, and combined with the fact that the developing storms were along I-88 and moving ESE, I didn’t think we’d see anything. One storm managed to push NE though, along outflow that was surging NE as well, from the main activity further south. The storm was high based, and had that good picturesque high based structure. A nice hail shaft was clearly visible too as it moved in. The storm ended up maxing out as it passed overhead. Ended up with a solid nearly 5-10 minute period of hail, with a few of the biggest stones up to 2.25”. Strong winds up to 55-60mph also accompanied the hail, making for a quality downburst. Trees were shredded with leaves flying everywhere, due to the hail/wind combo. The wind ended up bringing down a few small branches in the area as well. There was also widespread road flooding, mostly due to the combination heavy rains with the downburst and tree debris clogging storm drains. Following the storm was a double rainbow, some mammatus, and a quality backlit view of the storms departing at sunset. There is still hail up to nearly penny size on the ground at this time, nearly 3 hours post storm. Believe it or not, this was the first storm to produce severe criteria activity IMBY since 2011. .

Hit 90 here today, first 90+ day on the year. ORD was 89'd...mostly due to earlier lake breeze passage. MDW hit 90.

Welcome to July...

lol .