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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.

9am temps. DCA: 88 IAD: 87 BWI: 89 88.3 at home

I always thought 90@9 was too aggressive. MHT did 19 after 9 yesterday. It probably works better for a place that stays very mixed overnight like BOS or ORH.

A lot of evaporation going on too with the rain that moved through. When I went outside with the dog earlier it was like a sauna with the steam rising.

From Mount Holly AFD this morning- DISCUSSION... KEY MESSAGE 1...Dangerous heat and humidity will build across the region through Saturday. All time record high temperatures could be challenged today and Friday with widespread triple digit temperatures. Strong mid-level ridging across the Mississippi Valley, Great Lakes, and Ohio Valleys is building eastward into the Northeast and Mid Atlantic and will persist into the holiday weekend. A west to southwest flow will shift more west to northwest by Friday. The ridge will finally start to break and retreat some starting Saturday into Sunday. High temperatures are forecast to range between 100 to 105 degrees in most areas today and Friday. The shift to a more west to northwest flow aloft will allow for better mixing out of dewpoints during the afternoon, and also a component of downsloping (adiabatic warming) from the Appalachians. This phenomenon should be a little stronger on Friday with low level flow being slightly stronger, but regardless dewpoint should still mix out a fair amount this afternoon. This setup will support temperatures climbing above 100 degrees across most non mountainous inland areas as dewpoints mix out into the mid to upper 60s during the afternoon hours. Resulting forecast heat indices are mostly in the 105-110 degree range, though localized values upwards of 115 degrees are possible if dewpoints stay closer to 70 degrees. This is indeed the type of synoptic pattern that could challenge all time record high temperatures in our region. Areas north of I-78 are forecast to experience the hottest air temperatures (upper 90s to near 100 degrees, even as high as 95 degrees at Mount Pocono) today. Further south, the hottest air temperatures (mainly in the 100-105 degree range, and in the upper 90s to near 100 degrees for the New Jersey Shore and Delaware Beaches) are forecast to occur on Friday.

76 for my low