First Frost?

As I sit here this glorious early autumn afternoon with temps hanging around 90°F and moderate dewpoints, I'm just simply suggesting to my loyal readers that our "first" frost may be in order this upcoming weekend!  By definition according to the NWS, it is not when you "see" white ice crystals on vegetation a few inches off the ground or on a thermodynamically cooled metallic or glass object that radiates heat away in an extremely efficient manner....oh no...it's when the observed temperature drops to 36°F for a period of time at the observation site. Really, it does make sense; but honestly, our topography in these parts on a calm morning allow for some parts to be below freezing while other sites would be 10°F warmer.  With all that said, KMDT smashed our 1927 record today...and oh by the way, I baked in most of it...just letting y'all know!

First the current temps...Octoaster to be sure...!

But by morning, a "northdoor" front will be pressing south...look at that "Finger Lakes" cool pressing towards the SusqQ Valley...that coolness will drain right down to the Chesapeake pushing all of the less dense warm air away like the Wisconsin O line did to the Michigan D line 2 weeks ago...

And come tomorrow morning, the entire region east of the Appalachian chain will be back to "normal" in terms of temps...the image below is a textbook example of what weather people here in the east refer to as a "backdoor" cold front!  My wife always pronounces that back door guests are the best!  That north Atlantic water sure does provide relief on a persistent NE low level flow...that's nearly a 50°F difference over 250 miles of interstate! 

As for the next 10 days or so...here is the GFS for weekend to weekend; ever so slightly below normal.  So Smitty, what is normal?  Good question!  For KMDT at this time of year; maxes mid to upper 60s with lows mid to upper 40s...

And as for precip...well...the graphic below suggests a front will be in our vicinity over the next week with opportunity for showers and the like.  For you grass farmers that read this, there is certainly an opportunity to fertilize, but wait until the front looks like it means business!  Certainly little likelihood for tropical systems according the GFS...

OK...I'm out.  Enough about the wx; now onto baseball!  Let's go TB tonight!  I'd like to see the Nats get by the Dodgers...tough chore!  Twinkies over the Yanks...?  Cards over ATL?  A midwest WS?  Who knows...but I do know that the cool winds are pressing from the north and east the next few days.  Enjoy the autumnal wx and possibly 1st frost...?  As for the song, I made plenty of backdoor references, so that was easy...enjoy!

Smitty

AA:  Last hot day today until next May-June period.  Gut feeling you'll be mowing again and possibly more than you want!  I'd like to see a Cards-Twins WS!