baltimoresun.com

« Bret weakens overnight, now a fish storm | Main | We've hit 100 degrees 104 times since 1871 »

July 19, 2011

Friday forecast: 100 at BWI, 102 downtown

The National Weather Service has dialed back its predictions for Friday's high temperature at BWI-Marshall Airport - from 102 to a mere 100 degrees. But the high at the Inner Harbor is still forecast to reach 102.

UPDATE, 12:15 p.m.: An Excessive Heat Watch has been posted for Thursday across all of Central and Southern Maryland. Temperatures will be in the upper 90s to 100 degrees, with Heat Index values of 105 to 110 degrees: 

"AN EXCESSIVE HEAT WATCH MEANS THAT A PROLONGED PERIOD OF HOT
TEMPERATURES IS EXPECTED. THE COMBINATION OF HOT TEMPERATURES AND
HIGH HUMIDITY WILL COMBINE TO CREATE A DANGEROUS SITUATION IN
WHICH HEAT ILLNESSES ARE POSSIBLE. DRINK PLENTY OF FLUIDS...STAY
IN AN AIR-CONDITIONED ROOM...STAY OUT OF THE SUN...AND CHECK UP
ON RELATIVES AND NEIGHBORS."

Earlier post resumes: We should expect these predictions to fluctuate as the week goes by, and computer models crunch fresh data and regularly spit out new information. A lot depends on how much cloud cover drifts into the region from elsewhere, providing some feeble shade against the July sun. That's pretty difficult to predict with much precision this far out.

Anyway, in the short term, forecasters are predicting some small chances for showers and thunderstorms Tuesday and Wednesday afternoon - in the range of 20 to 40 percent - as storms Dew Points Fridayfire up in the Midwest and ride around the edge of the high and stagger into Maryland's heat and very high humidity. 

NWS/Sterling science officer Steve Zubrick told me yesterday that dew points during this period will reach the low 70s, with some near the bay sloshing up to 75 degrees or higher. (see map) Add forecast temperatures of 95 again today, 98 on Thursday, 100 Friday and 99 Saturday, and it's going to be stifling.

Heat Index readings - a measure of the combined effects of heat and humidity on the body's ability to cool itself - are expected to top 110 degrees by the end of the week.

The Baltimore Health Department issued a Code Red Heat Alert today, effective through Sunday. That will open cooling centers across the city and send workers out to check on vulnerable residents.

Ocean City looks better, with a predicted high of only 88 degrees for FRiday, rising to 91 by Sunday. Deep Creek Lake is looking forward to highs of 87 for the entire weekend, with chances for showers every day from now thorugh Sunday.

I remember arriving at BWI once on a day like these, stepping out of the air-conditioned baggage claim area into the heat and humidity en route to the parking lots, and thinking, "This can't be the real air; it's gotta be bus exhaust. Nobody can be expected to breathe this stuff."Flower  

Well, it's possible to get a lungful of bus exhaust under there, but it really was the regular air, what Marylanders and visitors alike are expected to breathe in mid-summer. Here's a flower for the grave of whoever invented air conditioning. 

(SUN PHOTO: Amy Davis, 2011)

Posted by Frank Roylance at 10:20 AM | | Comments (1)
Categories: Forecasts
        

Comments

Your comment about breathing bus exhaust reminds me of one terrible day here in Glen Burnie last summer. First thing in the morning, I went outside, took a breath, and one word went through my mind: "poisonous." It was just hot, oxygen-poor air. I hope we don't get any more like that this summer but I'm not "holding my breath."

Post a comment

All comments must be approved by the blog author. Please do not resubmit comments if they do not immediately appear. You are not required to use your full name when posting, but you should use a real e-mail address. Comments may be republished in print, but we will not publish your e-mail address. Our full Terms of Service are available here.

Verification (needed to reduce spam):

About Frank Roylance
This site is the Maryland Weather archive. The current Maryland Weather blog can be found here.
Frank Roylance is a reporter for The Baltimore Sun. He came to Baltimore from New Bedford, Mass. in 1980 to join the old Evening Sun. He moved to the morning Sun when the papers merged in 1992, and has spent most of his time since covering science, including astronomy and the weather. One of The Baltimore Sun's first online Web logs, the Weather Blog debuted in October 2004. In June 2006 Frank also began writing comments on local weather and stargazing for The Baltimore Sun's print Weather Page. Frank also answers readers’ weather queries for the newspaper and the blog. Frank Roylance retired in October 2011. Maryland Weather is now being updated by members of The Baltimore Sun staff
-- ADVERTISEMENT --

Sign up for FREE weather alerts*
Get free Baltimore Sun mobile alerts
Sign up for weather text alerts
SKY NOTES WEATHER

Returning user? Update preferences.
Sign up for more Sun text alerts
*Standard message and data rates apply. Click here for Frequently Asked Questions.
Maryland Weather Center


Area Weather Stations
Resources and Sun coverage
• Weather news

• Readers' photos

• Data from the The Sun's weather station

• 2011 stargazers' calendar

• Become a backyard astronomer in five simple steps

• Baltimore Weather Archive
Daily airport weather data for Baltimore from 1948 to today

• National Weather Service:
Sterling Forecast Office

• Capital Weather Gang:
Washington Post weather blog

• CoCoRaHS:
Community Collaborative Rain, Hail and Snow Network. Local observations by volunteers

• Weather Bug:
Webcams across the state

• National Data Buoy Center:
Weather and ocean data from bay and ocean buoys

• U.S. Drought Monitor:
Weekly maps of drought conditions in the U.S.

• USGS Earthquake Hazards Program:
Real-time data on earthquakes

• Water data:
From the USGS, Maryland

• National Hurricane Center

• Air Now:
Government site for air quality information

• NWS Climate Prediction Center:
Long-term and seasonal forecasts

• U.S. Climate at a Glance:
NOAA interactive site for past climate data, national, state and city

• Clear Sky Clock:
Clear sky alerts for stargazers

• NASA TV:
Watch NASA TV

• Hubblesite:
Home page for Hubble Space Telescope

• Heavens Above:
Everything for the backyard stargazer, tailored to your location

• NASA Eclipse Home Page:
Centuries of eclipse predictions

• Cruise Critic: Hurricane Zone:
Check to see how hurricanes may affect your cruise schedule

• Warming World:
NASA explains the science of climate change with articles, videos, “data visualizations,” and space-based imagery.

• What on Earth:
NASA blog on current research at the space agency.
Most Recent Comments
Blog updates
Recent updates to baltimoresun.com news blogs
 Subscribe to this feed
Charm City Current
Stay connected