Depending on where you live in the are the first time you hit 90F degrees for the year is somewhere from late May until mid-June. Bostonís average first 90F is June 8th. We have seen 90F readings as early as April and made it through the entire month of June free of 90F. This year tomorrow is likely the day many of us will hit 90F for the first time.
90F is of course just a number, it can feel hotter at 85F than it can at 90F depending on the humidity. Also, the number of hours we experience 90F is a large part of how the overall day seems. On a day where we reach the mark at 9AM, itís certainly a lot more unbearable than if we hit it for just a few hours around 1PM and itís over by 5PM.
Dew Points are also a big player in how we all manage a 90F degree day. Tomorrow, while dew points will certainly be in the 60s, they wonít reach the oppressive 70s. There is an enormous difference in the amount of moisture in the air with a dew point of 65 versus 72. This difference makes the heat much more tolerable. Bottom line on tomorrow, sure itís going to be hot, but it could be a lot worse.
Iíll be updating the forecast @growingwisdom on Twitter.
The chart below gives a general idea of temperatures and dew points for tomorrow. Notice in Boston, this model predicts a high of 88F. We could certainly stay just shy of 90F Wednesday especially if we see a lot of cloud cover.
Showers occurred early this morning in many places, but not everyone saw them. I got about .15 inches of rain at the house, but other areas received a bit more. I like having a bit of rain just before it gets warm. It really helps the plants make it through any heat.
There is another chance of showers late tonight as part of the jet stream that is favorable for the formation of storms whizzes over us at around 30,000 feet. Tomorrow afternoon a cold front brings an end to the brief heat and humidity with another round of showers and storms possible. The exact timing of the front will help determine if these storms become strong or just push through rather uneventfully.
Behind the front drier and cooler air comes in for the rest of the week and the weekend. Highs Thursday will reach the lower 80s, but it might say in the 70s for Friday and Saturday. There wonít be any noticeable humidity for the weekend and with brilliantly blue ski another winner is on the way.
Lastly, the twin tornadoes in Nebraska were quite a site yesterday. If you havenít seen the video on this storm itís worth watching. Unfortunately, for the little town of Pilger Nebraska this storm went right through. The town is quite small only having 378 residents according to their web site.
Twin tornadoes are very rare and itís even rarer they would be captured on video. Ironically, itís been a very quite tornado season. This week isnít over yet and I suspect more severe weather is on the way for parts of the Midwest and even spreading the east coast. Tomorrowís map shows a slight risk of severe weather for swath of the country where about 78 million people reside.