Late night forecast blog breaking down Thursday's severe threat, a "conditional EML event Sun-Mon", and the real deal heat to start next week: cameronbarkerwx.weebly.com/forecasting/th…

This will be interesting

The combination of surface dew points in the mid 70s and an EML overhead (mid-level lapse rates >7 C/km) is resulting in extreme CAPE over the Northeast today with some values exceeding 5000 J/Kg, which is record territory in the region according to SPC Sounding Climatology.

The Midwest gets "corn sweat" as evapotranspiration adds additional moisture to the air on the hottest days. Days like today illustrate the Northeast can get a similar humidity boost as moisture is released from trees following a wet spring. Should we call this "tree sweat"?

Hanscom AFB (Bedford, MA ASOS) had a heat index of 112 for an hour today. Temperature of 97 + 77 dew point. Tomorrow, with lower dew points and a downsloping west wind, one of the hottest June days ever is on the table.

Logan already hit 90°F before 10AM—hotter than inland sites to the NW. Classic downsloping: air descends off the Worcester Hills, compresses, and heats up. This setup could easily push Boston to 100°F later today.

Current ASOS observations on what is now the hottest June day ever at several regional climate sites across SNE and the surrounding Northeast.

Today was the hottest June day ever recorded in Boston and Providence! (Update since Boston's temperature just jumped to 102 at 5:23 PM!) #102 #100 #MAwx #RIwx

Evening temperatures still in the mid 90s in Boston despite approaching 10 PM. Without getting into the specifics, running within a degree of the warmest ever recorded at this time of day.

It must be Saturday

Impromptu lake sunset intercept in Weymouth, MA

Looking N towards storms in N MA / S NH

Mammatus show north of the complex in Framingham, MA