World and Nation

Return to seasonal temperatures

After a lovely weekend more reminiscent of September than late fall, temperatures in Cambridge will cool down after a cold front passes through this morning. For the rest of the week, high pressure will dominate, bringing mostly clear skies and temperatures in the 35-45°F range.

On this day in 1946, scientists produced snow in MA in the “first modern-day cloud seeding experiment” (The Weather Channel). Cloud seeding involves spraying small particles that serve as cloud condensation nuclei into the atmosphere; this increases the probability that clouds will form in certain areas. The practice has been used to induce precipitation, to rain out pollutants before events such as the Beijing Olympics, and has been proposed as a mechanism to temporarily reduce global warming by increasing planetary reflectivity.