Weather Post by Dr. Ryan N. Maue
As the ridge of high pressure slowly edges eastward over the eastern USA, dewpoints in the 80sF and temperatures over the century mark are creating heat index values typically seen in Iran, Yemen, or Saudi Arabia. Along the Persian Gulf and Arabian Sea, sufficient moisture combines with the oppressive desert heat to generate heat indices in excess of 130F. As of 1 PM Eastern on Friday, parts of the DelMarVa peninsula are feeling the effects of Northern Hemisphere summer Middle-Eastern style.
From coolwx.com/extreme “Extreme Weather Site“, which keeps track of crazy global METAR or station data, Baltimore MD has a HI of 129F. An unofficial “records” site co-authored by myself shows current temperatures compared to daily and monthly records going back between 30-60 years. While some stations have much longer historical records, this quick-look is indicative of record high/low temperatures, and inspires the reader to cross-check the local National Weather Service office daily climate page to verify the “all-time” high. For instance, Newark NJ (KEWR) is going to test it’s all-time high temperature, currently sitting at 104F…
At my Florida State weather maps site, I plot up a variety of useful quantities from the brand new NAM/WRF 4-kilometer mesoscale forecast model which runs four-times daily over the Continental USA. These include simulated radar reflectivity, 2-meter temperature, and heat-index. It is cool to watch the near-surface temperatures wax and wane with the daytime heating or plunge as a thunderstorm cools an area with its outflow pool.