All Activity

94/104

97 here as of noon.

Noon obs: DCA: 97 BWI: 97 (has been to 98) IAD: 93

Noon ROund up ACY: 101 New Brnswck: 100 EWR: 99 JFK: 99 PHL: 98 BLM: 98 NYC: 96 TTN: 96 TEB: 95 ISP: 95 LGA: 94

Wow! I'm just one degree lower than yesterday at noon. I seem to be catching up...

Some clouds showing up and temps still rising Current conditions at Wilmington Airport (KILG) Lat: 39.67°NLon: 75.61°WElev: 72ft. Fair 99°F 37°C Humidity 46% Wind Speed N 5 mph Barometer 30.03 in (1016.6 mb) Dewpoint 75°F (24°C) Visibility 10.00 mi Heat Index 112°F (44°C) Last update 3 Jul 11:51 am EDT

It appears to different high temps at Mt Mitchell yesterday. Never really gave much thought until now----- but the 75 F (NWS local data from Greer) from the MOUNT MITCHELL, NC site and 78.4 F from Mount Mitchell State Park (operated in cooperation NCDEQ and NC Climate Office). As best I can tell, they are both at the same location, but slightly different official elevations and also LAT/Longs. One is 1902 meters and the other is 1894. Does anyone know why the differences? The elevations could be a reporting error on one but was wondering if two instrument locations or just co-located? Just a little surprised by the temp differences----maybe just me?

It was a solid (not to mention gross & uncomfortable) heatwave for sure but definitely fell short of hype locally. Which i knew would happen and called it last week in a local weather chat im on. One of the local mets said he sees "nothing" that would indicate we fall short of 100 on back to back days (Wed/Thu). They also hyped 110+ heat indexes. The reality? DTW highs were 94, 97, 96 (likely low 90s today). Max heat index was on July 1st at 105. Max dewpoint was 76, also on the 1st. No record highs were set but the record high min of 76 was tied on the 2nd.

Hows the water tmeps?

Westminster and Baltimore Inner Harbor both at 99°. The Baltimore City mesonet site is up to 96°.

KMDT hit 100 before mom. Insanity

Don’t think it’s getting as hot around here today at least. In Westminster right now and it’s getting decently cloudy.

Everything I did for chester I've done for Schyukhill also, except at 800m grid . Over 3600 grid cells. By weekend end I should have a fun little expose on the wild and wacky climate up there Sent from my SM-S731U using Tapatalk

95.4 so far at home. The flyovers have begun and apparently I’m on the flight path!

Crazy spread in CAMs today with convective coverage. The shitty W/WNW llvl flow really blows for coverage. But if we do see any storms enter the region they could pack quite a punch. The llvl flow is very weak but DCAPE values are absolutely nuts

Hey, I pulled together the estimated PRISM grid coverage and climate data package for Chester County. PRISM is a gridded climate dataset from Oregon State University’s PRISM Climate Group. Instead of only using individual weather stations, PRISM takes station observations, terrain, elevation, coastal effects, and other geographic factors into account to estimate climate variables across a continuous grid. It is commonly used for precipitation, temperature, dew point, vapor pressure deficit, solar/climate analysis, drought work, agricultural analysis, hydrology, and local climate comparisons. For Chester County, I estimated the county intersects about 151 PRISM-style 4 km grid cells. Each 4 km grid cell is: 4,000 meters wide by 4,000 meters tall About 2.49 miles wide by 2.49 miles tall 16 square kilometers About 6.18 square miles The coordinate file I made gives the estimated centerpoint of each 4 km cell covering at least part of Chester County. The file is latitude, longitude format with no header row, so it should be easy to paste into mapping tools, GIS software, or scripts. The ZIP file size is about 58 MB. Unzipped, the data is about 208 MB. What is included in the data package: Daily PRISM files from 1981 through July 1, 2026 Monthly PRISM files from 1895 through May 2026 1991–2020 monthly normals 1991–2020 daily normals The daily files are the day-by-day weather/climate estimates for each Chester County grid cell. These are useful for looking at specific storms, heat waves, cold snaps, wet/dry stretches, day-to-day variability, growing season conditions, and longer-term local trends. The monthly files go much farther back, starting in 1895 and running through May 2026. These are better for long-term climate history because they cover more than 130 years. They are useful for comparing recent months to the historical record, ranking wet/dry months, looking at long-term warming trends, and comparing different decades. The 1991–2020 monthly normals are the modern 30-year baseline averages. These tell you what is “normal” for each month at each grid cell, using the current standard climate-normal period. The 1991–2020 daily normals are the day-of-year baseline values. These are useful when you want to compare a specific date, like July 1 or October 15, against what is normally expected for that time of year. The main variables included or represented are: ppt: precipitation tmin: minimum temperature tmean: mean temperature tmax: maximum temperature tdmean: mean dew point temperature vpdmin: minimum vapor pressure deficit vpdmax: maximum vapor pressure deficit Depending on the specific PRISM product set, solar-related variables may also be available: solclear: clear-sky solar radiation soltotal: total solar radiation on a horizontal surface solslope: solar radiation adjusted for slope/aspect soltrans: cloud transmittance The temperature variables are useful for heat, cold, frost, growing season, and general climate work. The precipitation variable is useful for rainfall/snow-water equivalent, storm totals, drought, wet spells, and long-term precipitation trends. Dew point is useful because it describes actual atmospheric moisture better than relative humidity alone. It helps show humid-air events, muggy periods, and moisture transport. Vapor pressure deficit, or VPD, is useful for plant stress, evaporation demand, drought stress, and agricultural or ecological analysis. Higher VPD generally means the atmosphere is pulling moisture more aggressively from plants and surfaces. There is also a finer 800 meter PRISM grid option. The relationship is simple: one 4 km cell can be divided into 25 smaller 800 m cells, because 4,000 meters divided by 800 meters is 5 cells across, and 5 by 5 equals 25. So one 4 km cell equals: 5 smaller 800 m cells across 5 smaller 800 m cells tall 25 total 800 m cells inside one 4 km cell Each 800 m grid cell is: 800 meters wide by 800 meters tall About 0.50 miles wide by 0.50 miles tall 0.64 square kilometers About 0.247 square miles For Chester County, the rough 800 m estimate is around 3,300 cells if counting cells that touch the county boundary. If you simply subdivided all 151 estimated 4 km cells into 25 smaller cells each, that would be 3,775 possible 800 m subcells, but the more realistic county-clipped estimate is closer to 3,300 because the county boundary cuts through edge cells. The 800 m version would give much more local detail, especially in areas where terrain, elevation, urbanization, valleys, or county-edge effects matter. It would also be much larger. Since 800 m resolution has 25 times as many grid cells as 4 km resolution, the same date range and variables could be up to roughly 25 times larger. As a rough estimate, if the 4 km package is 58 MB zipped and 208 MB unzipped, the equivalent 800 m package could be somewhere around: 1.45 GB zipped 5.2 GB unzipped That is only a rough scaling estimate, because compression varies by variable and file structure, but it gives the right ballpark. I started with the 4 km version because it is much smaller, easier to transfer, and still gives a good countywide climate picture. If you want the higher-detail 800 m version, I can pull/build that too. Link to 4km https://drive.google.com/file/d/1uD5Q3O_voxpLItJHbWMpdAkgKtBMc-k0/view?usp=drivesdk Sent from my SM-S731U using Tapatalk

It was super hot in Pottstown, PA, yesterday, but the Big Boy didn’t disappoint.

My weather station is showing 98.6 with a dewpoint of 83.8 for a feels like of 128....I think my station has heat stroke. It's bad out there, but not that bad.

96/77 (112 HI) at home. 84/76 (95 HI) at DCL.

98/76/112 Beach isnt that bad..slight sea breeze probably mid 80s Hot sand

Refreshed…it’s all the sites mesowest has. ASOS includes the 5 min data. https://www.weather.gov/wrh/hazards?&zoom=9&scroll_zoom=false&center=43.329173667843904,-71.68579101562501&boundaries=false,false,false,false,false,false,false,false,false,false,false,false,false&tab=observation&obs=true&obs_type=air_temp&obs_popup=false&obs_density=10&obs_provider=ALL

Yeah, I'm a bit surprised that IAD has been running 2-3 degrees cooler than surrounding obs.