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July 2024 General Discussion


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Came across this site a long time ago. It has a reconstruction of temp data starting in 1820 from Ft. Snelling. Apparently it's the only reconstruction that has been done on data from early pioneer days. At least from what the article says at the time of the writing of it. Maybe that's has changed. Not sure.

Here's the link to the site, and you can access the data, and writings from there. https://www.climatestations.com/minneapolis-2/

But anyway, I got to thinking recently, what would that early data from a rural setting look like if you add more rural data to it up to the present day. The chart they present is Ft. Snelling data with Minneapolis/St. Paul threaded data.

1482122117_MSPanntemps1820-2023.thumb.png.fb537139645ce4565438d00179c9ca1c.png

So I found some co-op stations to use in my new, more rural revised dataset. They're about 15-20 miles outside of the MSP airport. Farmington, Rosemount, (both S) and Chanhassen NWS (W).

Farmington 3NW (212737) 1893-2009, Rosemount Research Center (217107) 1951-2023, and Chanhassen NWS (211448) 1996-2023.

Data has been time corrected for Farmington, and Rosemount. Chanhassen is 2400 readings, so no correction needed there. I then averaged them. 

The threaded data for the Twin Cities: St. Paul 01/1873-04/1891, MSP downtown 05/1891-4/8/1938, and MSP airport 4/9/1938-12/2023.

Since Farmington starts in 1893, that leaves a 20 yr period with no comparative data, so I had to reduce it by using the avg difference between Farmington (early decades), and MSP which ended up being -1.5.

Here are the results of my work. You can see how much cooler it is outside an urban environment, and it's especially noticeable from the time ASOS readings started to be taken from within the runways at MSP airport in 2002.

 

 

1437781020_MSPurbanvsruraldatasets.gif.a2c6e7d34682534c26af1551bb41929f.gif

152092072_MSPruralanomchrt.gif.4903fefef5a24a08fcde435f23742aaf.gif

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7 hours ago, Brian D said:

Came across this site a long time ago. It has a reconstruction of temp data starting in 1820 from Ft. Snelling. Apparently it's the only reconstruction that has been done on data from early pioneer days. At least from what the article says at the time of the writing of it. Maybe that's has changed. Not sure.

Here's the link to the site, and you can access the data, and writings from there. https://www.climatestations.com/minneapolis-2/

But anyway, I got to thinking recently, what would that early data from a rural setting look like if you add more rural data to it up to the present day. The chart they present is Ft. Snelling data with Minneapolis/St. Paul threaded data.

1482122117_MSPanntemps1820-2023.thumb.png.fb537139645ce4565438d00179c9ca1c.png

So I found some co-op stations to use in my new, more rural revised dataset. They're about 15-20 miles outside of the MSP airport. Farmington, Rosemount, (both S) and Chanhassen NWS (W).

Farmington 3NW (212737) 1893-2009, Rosemount Research Center (217107) 1951-2023, and Chanhassen NWS (211448) 1996-2023.

Data has been time corrected for Farmington, and Rosemount. Chanhassen is 2400 readings, so no correction needed there. I then averaged them. 

The threaded data for the Twin Cities: St. Paul 01/1873-04/1891, MSP downtown 05/1891-4/8/1938, and MSP airport 4/9/1938-12/2023.

Since Farmington starts in 1893, that leaves a 20 yr period with no comparative data, so I had to reduce it by using the avg difference between Farmington (early decades), and MSP which ended up being -1.5.

Here are the results of my work. You can see how much cooler it is outside an urban environment, and it's especially noticeable from the time ASOS readings started to be taken from within the runways at MSP airport in 2002.

1443098884_MSPurbanvsruraldatasets.gif.2f9f82cb77c1a65b7b3518fdad3d64bf.gif

401705935_MSPruralanomchrt.gif.c3100814fd596b4dd5280de2dab70523.gif

 

Very interesting analysis!

Those 38 degree annual mean years in 1843 and 1875 are insane. Wouldn’t that technically qualify as like a subarctic climate??

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10 hours ago, Brian D said:

Been a very pleasant few days, but looks like a good chance at shwrs/stms today. Unfortunately lots of smoke has been around from western/northern fires. Nasty skies!

Hot weekend on tap. Could reach low 90's in town. Top 5 heat. 

Smoke July 22.jpg

I am keeping an eye on the AQI here but so far it has been staying in check this far south.

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38 minutes ago, weatherbo said:

Only reached 60 here today with low clouds and fog all day.  Looks like a summery pattern setting up late week into the weekend. Currently 56 with fog/mist.

Only beat you by 5dF. Chilly, cloudy day with a stiff Lake breeze. Although the Sun did peak out late this aftrn for a bit. Not much help. 

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6 minutes ago, OrdIowPitMsp said:

High of 75 today. Another top shelf day. Dog days of summer are lurking though. 

We are over halfway through with the Dog Days which run from July 3 to August 11.

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We've had small cells pop up for the last few days.  The last two days I only got a tenth or so from each, but we got lucky early this morning when a potent cell blew up over Cedar Rapids.  We got vivid lightning, some wind, and very heavy rain that totaled 1.74".  My July total is 6.65".

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46 minutes ago, Stebo said:

Airport got missed yesterday but I had easily 2" or more at my house. City airport had 1.48 just in an hour.

I got missed yesterday too, but this month should be the largest difference in precip between my yard and DTW 7-8 miles west, since I've been keeping track (precip 2000, snow 1995). Month to date imby 4.88", DTW 2.02".

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On 7/22/2024 at 2:18 PM, Brian D said:

Came across this site a long time ago. It has a reconstruction of temp data starting in 1820 from Ft. Snelling. Apparently it's the only reconstruction that has been done on data from early pioneer days. At least from what the article says at the time of the writing of it. Maybe that's has changed. Not sure.

Here's the link to the site, and you can access the data, and writings from there. https://www.climatestations.com/minneapolis-2/

But anyway, I got to thinking recently, what would that early data from a rural setting look like if you add more rural data to it up to the present day. The chart they present is Ft. Snelling data with Minneapolis/St. Paul threaded data.

1482122117_MSPanntemps1820-2023.thumb.png.fb537139645ce4565438d00179c9ca1c.png

So I found some co-op stations to use in my new, more rural revised dataset. They're about 15-20 miles outside of the MSP airport. Farmington, Rosemount, (both S) and Chanhassen NWS (W).

Farmington 3NW (212737) 1893-2009, Rosemount Research Center (217107) 1951-2023, and Chanhassen NWS (211448) 1996-2023.

Data has been time corrected for Farmington, and Rosemount. Chanhassen is 2400 readings, so no correction needed there. I then averaged them. 

The threaded data for the Twin Cities: St. Paul 01/1873-04/1891, MSP downtown 05/1891-4/8/1938, and MSP airport 4/9/1938-12/2023.

Since Farmington starts in 1893, that leaves a 20 yr period with no comparative data, so I had to reduce it by using the avg difference between Farmington (early decades), and MSP which ended up being -1.5.

Here are the results of my work. You can see how much cooler it is outside an urban environment, and it's especially noticeable from the time ASOS readings started to be taken from within the runways at MSP airport in 2002.

 

 

1437781020_MSPurbanvsruraldatasets.gif.a2c6e7d34682534c26af1551bb41929f.gif

152092072_MSPruralanomchrt.gif.4903fefef5a24a08fcde435f23742aaf.gif

After the above little project in the quote, I wondered what the dataset would look like if I attempted to take out the suburban taint in the data. Just a a possibility on what would a truly rural look the data would have. This is what I came up with after perusing the metadata on site locations, and coming up with correction figures. The adjustments were not too aggressive. It's a rather fun, but tedious exercise. When you have data going back into the 1820's, hey, why not. :) 

72860324_MSPtimeUHEdatasets.gif.3ef06f93bc0c6d8d957e3d598b7ddb7d.gif

532034815_MSPruraltimeUHEanomchrt.gif.e7c654248c4eedfe23f046dbf167e38a.gif

 

 

 

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1 hour ago, Chinook said:

I think I'm starting to notice the forest fire smoke. Things are just a little whitish-yellow high in the sky.

I noticed that a bit last night as well. Cold front pushed the majority of it out of here this morning. Stays out of here for the next couple days but I’m sure we’ll end up in the thick of it at some point.

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Beautiful sunny day in the upper 60's with a northeast breeze that made it feel a tad chilly in the shade.  Low tonight in the upper 40's with some frost possible in the traditional interior cool spots.  Mid 70's to follow tomorrow then a stretch of at least 6 days in the 80's which will be the longest this season.  The dog days of summer.

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