October Discobs 2026

[snowfan]

Is it me or is leaf change a bit delayed? Im seeing sugar maples with color but not much else. 

[pazzo83]

looks light straight up San Diego weather for the next 7 days at least (highs in the 70s, lows in the 50s).  Damn.  Gonna have to water this week.

Why is there a frost advisory right outside the core urban areas (DC, Arlington, Alexandria) when the lows are only gonna be in the mid 40s?

[yoda]

13 minutes ago, pazzo83 said:

looks light straight up San Diego weather for the next 7 days at least (highs in the 70s, lows in the 50s).  Damn.  Gonna have to water this week.

Why is there a frost advisory right outside the core urban areas (DC, Arlington, Alexandria) when the lows are only gonna be in the mid 40s?

DISCUSSION...
KEY MESSAGE 1...One more night of frost potential will give way
to a warming trend early this week.

High pressure remains centered along the Mid Atlantic coast this
afternoon but will drift southwestward tonight. Low-level flow
will turn westerly allowing for less of a marine influence. At
the same time, temperatures aloft will begin rising. The surface
gradient is weak enough that forecast soundings indicate sharp
decoupling. This will send lows into the 30s again, particularly
in outlying and low lying areas. A Frost Advisory has been
issued for the piedmont where the growing season remains active,
as these areas will likely decouple best. The advisory is based
on the forecast lows, although there is some potential with dew
points starting in the 40s and the moderating airmass, we may
ultimately end up with just a heavy dew even if temperatures
drop to the mid 30s. Ridgetops meanwhile will stay in the 40s.
Expect river valley fog to develop again, although some guidance
suggests the fog may affect more areas than in previous nights.

[Eskimo Joe]

2 hours ago, pazzo83 said:

looks light straight up San Diego weather for the next 7 days at least (highs in the 70s, lows in the 50s).  Damn.  Gonna have to water this week.

Why is there a frost advisory right outside the core urban areas (DC, Arlington, Alexandria) when the lows are only gonna be in the mid 40s?

Soils and streams getting dry again. If we can't at least maintain parity with seasonal precipitation this winter, next spring could be a rough drought.

[dailylurker]

9 hours ago, WxUSAF said:

Climo first freeze for you is probably Nov 1-ish? Couple days earlier for me? IAD is behind schedule. But with the early November forecast, probably most of us that haven’t had a freeze yet will be later than normal.

Right here. I'd say probably by Nov 10th. I've had a few light frost already which is pretty cool. This has been one of the nicest Octobers in a while. 

[arlwx12]

According to the NWS observation map, one place in McLean hit 36 this morning and a few places in Arlington registered 38-39.

I think that because LWX anticipates similar conditions overnight, they went ahead and issued a frost advisory.

 

[JenkinsJinkies]

37 minutes ago, Eskimo Joe said:

Soils and streams getting dry again. If we can't at least maintain parity with seasonal precipitation this winter, next spring could be a rough drought.

Yet everyone calls me crazy when I point that out.