Midweek highs could threaten records
We're looking at some serious 90-plus heat this week, Maryland. NWS forecasters out at Sterling are calling for highs on Wednesday and Thursday that could threaten records at BWI-Marshall Airport. I suspect some spots in the city could toy with the 100-degree mark.
The chances for a thunderstorm to cool things off, at least temporarily, look pretty slim - none at all today, then no better than 30 percent through Wednesday night, then rising only to 40 percent on Thursday as a weak front slides by. After that, it's all sunshine and more 90-degree heat.
The city did not extend Sunday's Code Red Heat Alert to Monday. (An earlier version of this post said, erroneously, it did.) The region also remains under a Code Orange Air Quality Alert (map left). Hot air, sunshine and vehicle exhaust combine to cook up plenty of ozone, making the air we're breathing outdoors unhealthy for vulnerable groups. That includes the very young, the elderly and those with heart and respiratory problems. The forecast for Tuesday is no better.
Here are the highs forecast for this week for BWI, and the record highs for those dates. (UPDATED FORECASTS @ 5 P.M. Forecasters knocked 2 degrees off their forecast highs for Weds. and Thurs.)
MONDAY: 91 degrees forecast. Record 100 degrees in 1923
TUESDAY: 91 degrees forecast. Record 100 degrees in 1988
WEDNESDAY: 94 degrees forcast. Record 97 degrees in 1894
THURSDAY: 93 degrees forecast. Record 98 degrees in 1966
FRIDAY: 90 degrees forecast. Record 99 degrees in 1997
SATURDAY: 90 degrees forecast. Record 99 degrees in 1954
SUNDAY: 94 degrees forecast. Record 99 degrees in 1952
Since March 1, the airport has been running an impressive 4.8 degrees above the long-term averages. We have accumulated 13 days of 90-degree-plus weather, with another six straight in the forecast. And we haven't yet reached July, which is statistically the hottest month of the year.
The long-range forecast - for July, August and September (map above) - indicates there is a greater-than-average chance that temperatures in the mid-Atlantic states will continue to exceed long-term averages.