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90F/DP 78 at 9:25am

Per the 12z IAD sounding, the convective temp is 95°. We are slightly warmer at 700mb compared to yesterday, and there's weak warm air advection noted as well between 600mb - 800mb. That should work to maintain a reasonably stout cap throughout the day.

Bit of a bounce as we approach 9:30 ... 85's common. 88 downtown ORH matches Logan, which I believe will breach 90 by 10 as they've been sitting under this rising saline torch of a sun bathed in an ideal WNW light wind for the last half hour... Still some lingering upper 70s in the deep outflow tainted interior though.

Somerset County at around 2500' to 3100' feet is the place to be. 85 and 83 degrees respectfully yesterday at the flight 93 memorial and Mt Davis, which makes sense assuming 5.5 degrees per 1000 ft Sent from my SM-S731U using Tapatalk

My annual warning for reading the 5-minute obs. Because of rounding, a 5-minute reading of 99 could mean 98 or 99. A reading of 100 is 100.

I had nothing to do with the conceptions of it. I just run it. There was a push by MDEM to have a mesonet system following the success in other states. University of Maryland agreed to partner with the effort and it was just a matter of funding to show up for it. That's a very short narrative for a long process, but that's the gist of it.

Not here but I think we're going to hear alot about this Typhoon in the coming days

Got to 77 here, but already 91

Yeah. Cant say its a fluke or outlier sensor either. As of 9am almost all the real time sensors in NYC are in the 90s, plenty mid 90s as well. Just a couple were still at 89.

How did you and @wxmeddler get one going for MD?

Good morning from Colt State Park in Bristol, a hazy 79 degrees with light breeze.

100+ should happen unless it clouds up at all.

IAD and BWI are probably a lock. DCA will always be heavily dependent on a river wind. That being said, I would tend to agree with you.

Unfortunately, Virginia does not have a statewide mesonet.

Valid point ... the 9 by 9 was a Boston market thing at WHDH with Harv' ..but I heard Dick Albert over on ABC/Channel 5 Boston and Barry on Channel 4 also use that expression in the early 1990s - jesus... you wonder if all adages older than 300,000 years need to be re-evaluated, which come think about it ... maybe that's true due to CC anyway. Anyway, that fits what you suspect there, about the HFD-BOS region. Y'all up there's more of a pseudo alpine climo anyway. 10 after 10's up next. By the way... I noticed a lot of sites were struggling in the 91 range yesterday, and unilaterally ... many of them leaped to 95 to even few 97's at around 3pm, all at once. So yeah..there's no rule that these things have to be very linear. The purpose of today's tedious Asperger obsession is to test these adages.

DCA reached 90 degrees at 855am... I'm thinking 103 today for a high temperature https://www.weather.gov/wrh/timeseries?site=kdca

12z IAD sounding shows warmer temps today at 700mb, now +12°. We're probably capped against any thunderstorm chances outside some rogue surface boundary like a sea breeze, etc.

Just a sprinkle here last night and we are off to the races at 86 .

First time since 2011 that we're going to get widespread 100s. Even in 2012 and last year, when there were 100s in the region, not everybody hit, and there was a chance it would just miss. But today and tomorrow look like no doubters for almost all of the region, like 7/22 and 7/23/2011.

Select record high minimum temperatures (if they hold up through 1 am EDT):

89/76/100 outside of Laurel MD. Today and tomorrow gonna be a special one

Do you know if there's a similar map for VA? Thank you!

87/78 as of 9 AM

Yeah, Brownsville is already 95° at 9am. Brownsville Temp: 95°F 3h Precip: 0.00″

In Carteret, weather station has us at 91° as of 9 AM.