baltimoresun.com

« AccuWeather.com: A busier hurricane season ahead | Main | Baltimore was 5th snowiest U.S. city »

March 11, 2010

Mild temperatures, heavy rain, threaten flooding

You knew this couldn't last. We've had three days in a row, now, with highs in the 60s. That hasn't happened here since last Nov. 8-10.

But sunny days in the 60s will give way this weekend to four days in the 50s, with rain. And, for the western counties, especially, the mild temperatures and rain will combine to melt down the snowpack that remains on the ground there. Forecasters say small stream and creeks will likely overflow their banks, and river flooding could follow.

The National Weather Service has already issued Flood Warnings for portions of West Virginia southwest of Maryland's Garrett County. There are Flood Watches up from Garrett east to Washington County, including the cities of Cumberland and Hagerstown, where as much as 4 inches of rain could fall through Saturday.

East of the mountains, there are Hazardous Weather Outlooks posted as far as Carroll, Howard and Montgomery counties.

UPDATE: 6 p.m.: Flood watches are now posted for all Maryland counties west of the bay, plus the Upper Eastern Shore

For Baltimore, the rain is forecast to begin late Thursday night into Friday, with more than an inch expected by early Saturday morning. The rain could be heavy at times late Friday and Saturday, with another two inches possible. Rain chances continue into Monday, so it appears the weekend will be a washout. But at least it's not snow. And our snow cover is gone, except for some lingering piles. So we won't have to add that water to the runoff. The rain will be quite enough, thank you.

 

Needless to say, though, we'll need to be on the lookout for wet basements, leaks through ice-damaged roofs and gutters, overflowing creeks and street flooding. And that can collapse roads, as this amazing video from Freeport, Maine demonstrates.

Never drive through flooded low spots. It's amazing how little water it takes to float a car and carry it downstream. I suspect we will be reading about water rescues, anyway, this weekend.

All this rain is approaching as a low-pressure system moves very slowly toward us out of the Midwest. The counter-clockwise flow around the low is drawing mild, wet air north from the Gulf and, eventually, the Atlantic.

The heaviest rain will arrive late Friday and Saturday. Here's a bit of this morning's forecast discussion from Sterling:

"ONE BATCH OF RAINFALL ONGOING FRIDAY MORNING MAY LIFT NORTH IN THE AFTERNOON...LEAVING CLOUDS AND DRIZZLE BUT ANOTHER MORE SIGNIFICANT AREA OF RAINFALL IS STILL ON TRACK TO AFFECT THE [FORECAST AREA] FRIDAY NIGHT AND SATURDAY. RAINFALL TOTALS OF 1 TO 3 INCHES...WITH POTENTIAL FOR HIGHER AMOUNTS IN UPSLOPE AREA...ARE LIKELY WITH THIS SIGNIFICANT AREA OF RAIN FRIDAY NIGHT INTO SATURDAY."

The chances for rain will continue into Monday as the storm makes its leisurely exit.

Posted by Frank Roylance at 10:49 AM | | Comments (2)
Categories: Forecasts
        

Comments

More Happy Farmers!

FR: Not if they can't get into their muddy fields to plant. They're going to want some drying-out time after this.

Looks like I'll be marching through quite a storm at Sunday's St. Patrick's Day parade. That's ok...it'll make the beer at the finish line all the more refreshing.

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