baltimoresun.com

« Shary menaces Bermuda; new storm forming | Main | Potted plants freeze yet? They will soon »

October 29, 2010

Freeze Watch tonight west of I-95

After a week that saw two record-warm overnight lows, autumn will come rushing back to Baltimore tonight as clear skies and diminishing winds allow radiational cooling to drop temperatures into the 30s.

NOAA/NWSForecasters at the National Weather Service's forecast office in Sterling, Va. have posted Freeze Watches (dark blue areas on the map) for Maryland west of the I-95 corridor (and east of counties that have already seen a freeze this fall):

"A FREEZE WATCH MEANS SUB-FREEZING TEMPERATURES ARE POSSIBLE.
THESE CONDITIONS COULD KILL CROPS AND OTHER SENSITIVE VEGETATION
."

UPDATE, 4 p.m.: The NWS has bumped the Freeze Watch to a Freeze Warning tonight (light blue) for Washington, Frederick and Carroll counties in Maryland, with overnight lows expected to reach 30 to 32 degrees. Earlier post resumes below:)

The forecast low for BWI-Marshall Airport overnight is 35 degrees. Westminster could see 34 degrees and Hagerstown's forecast shows a low of 32. It could get colder in the usual rural locations and low spots, producing the first freezing temperatures since last spring. Freeze Warnings and Frost Advisories may be issued for some locations later today.

The cooler weather is coming to us with high pressure that is drawing cold air out of the northwest on brisk winds. As the high moves to our south, winds will shift to the west and calm, allowing whatever solar heating we manage today to radiate back into space tonight. 

The weekend should continue sunny and seasonably cool with highs in the low 60s and overnight lows near 40 degrees.

Posted by Frank Roylance at 10:41 AM | | Comments (3)
Categories: Watches and warnings
        

Comments

"...the first freezing temperatures since last spring." Huh?!?!? Well, I woke up to frost last Saturday in Manchester, MD.

FR: A frost is not necessarily a freeze. Frost can occur when air temperatures are above freezing. We're also talking about Baltimore, which has the latest average freeze date in the state, thanks to the urban heat island effect..

Had frost right next to the pepper plants last Saturday morning; yet they still survived. I expect today is their last.......... Oh, my eggplants!

FR: Which reminds me of a song with the line, "You're standing in my kumquats!" Can anyone name the off-Broadway musical ? (No fair Googling it!)

The intermediancy and unpredictability of wind are two factors that negatively effect the ability of wind to become a constant reliable source for producing electricity. I have heard it quoted that the National Weather Service with its current meteorological data is unable to reliably predict wind velocity in an area more than two hours in the future. Can you comment on the accuracy of that report? Thank you

FR: Off the top of my head? Sure. Common sense would suggest that wind in any given location is not a constant source of power that one would want to bank on for reliable current. But it can supply the grid with supplemental power (as it is doing today on a large scale in many place in Europe), and can be useful in small, free-standing applications that don't require constant power, such as water pumps. Recently announced plans to connect offshore windfarms along the mid-Atlantic coast with a transmission "backbone" could also provide a way to harvest electrical power from a far-flung network of turbines that would be more reliable in the aggregate than any individual farm. Finally, I would challenge the accuracy of that (unsourced) statement about the NWS. Forecasters routinely make local wind speed forecasts two days in advance. But it's not clear to me why wind energy producers would need precise forecasts. The siting decisions are made based on long-term, empirical data on wind speed averages.

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