Record cold…frost in July!

July 9, 2009 - Leave a Response

Right in the middle of what is normally the hottest time of the year, it is record cold making the headlines in 2009.  On Prince Edward Island, Canada, temperatures dropped into the 30s early Wednesday morning, producing what many believe is the first ever July frost for that Canadian province.  The report from CBC News is posted below.  FYI, the temperatures in the article are in celcius: 3.8C = 39F, 5.1C = 41F, 22C = 72F.

Tom Tasselmyer

Frost in July hits P.E.I.

Last Updated: Wednesday, July 8, 2009 | 1:50 PM AT

CBC News

Temperatures dropped to a record low in Prince Edward Island overnight Tuesday, with reports of frost throughout the province.

An official record low of 3.8 C was set early Wednesday morning at Charlottetown airport.

The previous record for that date was 5.1 C, set in 2005.

Bob Robichaud, a meteorologist with Environment Canada, said that to his knowledge, frost has never been reported before in July in P.E.I.

“That 3.8 we got last night kind of sticks out as being lower than some of the other records for anytime in early July,” Robichaud told CBC News on Wednesday.

“So we’re looking at a significant event,” he said.

Environment Canada has issued a frost risk warning in low-lying areas of the province for Wednesday night. The temperature is expected to dip to 4 C.

The forecast for Thursday, however, calls for sunny skies and a temperature of 22 C for the province.

Triple Hs of summer on hold…so far…

July 6, 2009 - Leave a Response

The typical hazy, hot, humid days of summer have been put on hold by a cooler than normal weather pattern.  Low pressure in eastern Canada continues to funnel cooler and drier than normal air into the mid Atlantic and northeastern United States.  At BWI-Marshall, we have not hit 90° since an unusual three day heatwave in late April (April 25-27) and  temperatures for the first 6 days of July are running 4.2° below normal.

Tom Tasselmyer

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Drying Out

July 6, 2009 - Leave a Response

If you have been working in the garden or have played a game of golf recently you may have noticed that the ground is beginning to dry out. It has been a while since the area has received a significant rain.

JC_RainShort

The last heavy rain event was on June 18 when 1.77 inches of rain fell at BWI-Marshall airport. Since then rain has been infrequent and on the light side.

  • June 20   .32 inches
  • June 30   .11 inches
  • July 1     .37 inches

The weather pattern for this week positions the wettest weather to the north and south of the Mid Atlantic region. If any rain falls over Maryland it is likely to be spotty and light.

JC_QPFRain chances may improve by the weekend. Until then make sure the garden and container plants are well watered.

John Collins

2009: Normal Temperatures, so far…

July 3, 2009 - Leave a Response

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With one half of 2009 in the record books, temperatures are running just about normal for the year so far.  At BWI-Marshall, we have had 3 warmer than normal months and 3 cooler than normal months, leaving us just a few hundredths of a degree above the 30 year (1971-2000) average temperaature for January through June.  And, there are no signals of an extreme weather patterrn in sight for the next 90 days.  The outlook from NOAA’s Climate Prediction Center is calling for “equal chances” or warm or cool weather for July through September, and “equal chances” of wet or dry weather for the same time period.

july_aug-sep_09tempsjuly_aug_sep_09precp

Tom Tasselmyer

Precipitation Perspective On The First Half Of 2009

July 1, 2009 - Leave a Response

Late 2008 was dry and 2009 started out dry but we have done some catching up. It seems like some sort of record should have been broken for precipitation but the numbers are not even close.

The official records for Baltimore going back to the late 19th century show that the January-June period of 2009 is only the 26th wettest.

1.           1889      34.15”

2.           1924      32.36”

3.           1983      31.07”

4.           1972      30.57” (The year of Hurricane Agnes)

5.           1892      30.40”

10.       1886        29.59”

20.       1878        26.22”

25.       1932         24.98”

26.       2009      24.80”

A look at the “spring” months of March, April and May puts 2009 in the top ten wettest on record.

1.         1889            21.23”

2.         1983            18.82”

3.         1924            18.35”

4.         1952            17.89”

5.         1953            17.60”

8.         2009         16.29”

A focus on the month of June places this year in the top 25 wettest in the record books.

1.         1972            9.95” (The month of Hurricane Agnes)

2.         1948            9.36”

3.         1963            9.16”

4.         1951            8.80”

5.         1920            8.25”

10.       2006            7.32”

20.       1924            5.54”

22.       2009          5.52” (Tie with 1911)

Records or not, it has been wet recently and the region goes into the summer months with water to spare.

John Collins

June 2009: Cloudy, Cool & Wet

June 30, 2009 - Leave a Response

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Prelliminary stats are in for June 2009 at BWI-Marshall. The month turned out slightly cooler than normal with only one “sunny” day (cloud cover 30% or less) and no days with a maximum temperature of 90° or higher.

Tom Tasselmyer

New Weather Satellite Launched

June 29, 2009 - Leave a Response

NASA has launched the latest weather satellite.

JC_GOES_O_LaunchImage above: Rising above the two lightning towers around the pad, a Delta IV rocket races into the sky with the GOES-O satellite aboard. Photo credit: NASA/Kim Shiflett

The item below is a portion of the press release concerning the launch.

——————————————-

The GOES-O satellite lifted off from Launch Complex 37 at Cape Canaveral Air Force Station in Florida at 6:51 p.m. EDT atop a Delta IV rocket. From a position about 22,300 miles above Earth, the advanced weather satellite will keep an unblinking eye on atmospheric conditions in the Eastern United States and Atlantic Ocean.

Mission Overview
GOES-O is the latest weather satellite developed by NASA to aid the nation’s meteorologists and climate scientists. The acronym stands for Geostationary Operational Environmental Satellite. The spacecraft in the series provide the familiar weather pictures seen on United States television newscasts every day. The satellites are equipped with a formidable array of sensors and instruments.

GOES provides nearly continuous imaging and sounding, which allows forecasters to better measure changes in atmospheric temperature and moisture distributions, hence increasing the accuracy of their forecasts. GOES environmental information is used for a host of applications, including weather monitoring and prediction models.

——————————————————

GOES-O will be parked in a geostationary orbit over the equator and will be tested over the next few weeks. The satellite will then be put in a “storage mode” until it is needed to replace one of the older GOES satellites now in operation.

You can see images and videos about GOES-O by clicking on the following link……..

http://www.nasa.gov/mission_pages/GOES-O/multimedia/index.html

John Collins

Tropics Heating Up

June 27, 2009 - Leave a Response

A disturbance in the Caribbean is beginning to show signs of organization.

JC_TROPsat

Hurricane forecasters do not see an immediate threat from  the feature but it is expected to drift into the Gulf of Mexico over the next day or two. Conditions will then be more favorable for further development.

If this disturbance were to become the season’s first named storm, the name would be “Ana”.

John Collins

What is a weather forecast worth?

June 26, 2009 - Leave a Response

A recent survey of American adults found that 96% use weather forecasts to some extent, 87% check the weather forecast at least once per day, and the average value of each forecast for these users is about 10.5 cents.  The survey was conducted in 2006 by the National Center for Atmospheric Research.

Some other interesting revelations from the survey include:

- Americans use about 300 billion weather forecasts each year
- Those surveyed received forecasts 3.8 times per day
- The most common source for weather forecasts is a television station

For more tidbits from this research, see the news release posted below.

Tom Tasselmyer

BOULDER-Close to 9 out of 10 adult Americans obtain weather forecasts regularly, and they do so more than three times each day on average, a new nationwide survey by scientists at the National Center for Atmospheric Research (NCAR) has found. The value Americans place on these forecasts appears to be far more than the nation spends on public and private weather services.

The research is the first comprehensive study of its kind to examine how the public perceives, uses, and values weather forecasts. Funded by the National Science Foundation, NCAR’s sponsor, and the National Oceanic and Atmospheric Administration, the study appears in the June issue of the Bulletin of the American Meteorological Society.

U.S. adults obtain an estimated 300 billion forecasts each year, says NCAR scientist and lead author Jeffrey Lazo. The study also reveals that most people are generally satisfied with weather forecasts and have fairly high confidence in forecasts with a lead time of one to two days.

“Weather forecasts equate to an enormous volume and multiplicity of information,
when you account for the array of forecast providers, communication channels, and the size and diversity of the U.S. population,” Lazo says.

Understanding how individuals use day-to-day weather information can help direct the development of more relevant and valuable weather forecasts and warnings by providers like the National Weather Service, he adds.

Gaining a better understanding of people’s attitudes and behaviors toward forecasts also provides valuable information to forecasters and emergency managers.

“Better communication strategies can be developed for hazardous weather like hurricanes, winter storms, and floods,” Lazo says. “Improved understanding will also help forecasters to communicate forecast uncertainty more effectively.”

—–More than three forecasts a day—–

The Internet-based survey, conducted in November 2006, collected information about respondents’ weather-related activities and experiences, as well as basic demographic information. Of the 1,520 individuals surveyed, 1,465 (96 percent) said they used weather forecasts.

Of those 1,465, 87.1 percent reported getting a forecast at least once a day on average, while 9.2 percent reported doing so once a day or less on average.

Although the number of forecasts a person obtains varies significantly from day to day, depending on factors like weather events and planned activities, the researchers found that on average survey participants received forecasts 3.8 times a day. These findings, when extrapolated to the total U.S. adult population of 226 million, indicate that Americans receive a yearly total of about 300 billion forecasts.

—–Valuing a forecast—–

The authors cautioned that it is difficult to put a dollar figure on the value of forecasts. However, the researchers asked respondents what they believed forecasts to be worth, presenting them with hypothetical amounts that they were currently paying in taxes and asking if they felt that value was correct, worth more, or worth less than the amount indicated.

Respondents indicated that, on a per-household basis, they would place an average value of about 10.5 cents on every forecast obtained. This equates to an annual value of $31.5 billion. In comparison, the cost of providing forecasts by government agencies and private companies is $5.1 billion, according to the paper.

“Our estimates indicate that Americans are getting a good deal on weather forecasts,” says Lazo. “While it’s hard to precisely estimate the value of the forecasts, it is clear that there is a significant difference between the cost of forecasts and the value that people place on them.”

—–Fascination with the weather—–

Coauthor Julie Demuth, an NCAR associate scientist, says the study also reveals people’s curiosity about the weather, with 85 percent of respondents saying that more than half the time they obtain forecasts simply to know what the weather will be like.

“This tells us that people generally have a high level of interest in weather forecasts, regardless of whether they are using this information directly for planning and decision making,” says Demuth.

Many people use forecasts for planning specific activities, such as vacations, and routine daily activities, such as deciding what to wear and how to get to work or school. The peak periods for accessing forecasts are the early morning, early evening, and late evening, says Demuth.

The most common source for forecast information is local television stations, with individuals obtaining forecasts 33.7 times per month on average. Cable television and radio are the next most popular sources. Web pages and newspapers were less common sources overall, but both are a daily or more frequent source of forecasts for 27 percent of respondents.

“We should be doing this type of survey every two to three years so we can see what changes are happening, particularly in how people are using technology like mobile phones and the Internet to receive forecasts,” says Lazo.

The University Corporation for Atmospheric Research manages the National Center for Atmospheric Research under sponsorship by the National Science Foundation. Any opinions, findings and conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.

- The End -

Scientific contacts:
Jeffrey Lazo, NCAR Project Lead
303-497-2857
lazo@ucar.edu

Rebecca Morss, NCAR Scientist
303-497-8172
morss@ucar.edu

Julie Demuth, NCAR Associate Scientist
303-497-8112
jdemuth@ucar.edu

Cheryl Dybas, NSF Public Affairs
703-292-7734
cdybas@nsf.gov

Space Station View Of A Volcanic Eruption

June 26, 2009 - Leave a Response

From Spaceweather.com :

Perfect timing. On June 12th, just as Russia’s Sarychev Peak volcano was erupting for the first time in 20 years, the International Space Station flew directly overhead. Astronauts had their camera ready and snapped one of the most dramatic Earth-science photos ever taken from space:

Researchers are studying this rare photo to learn about the early stages of powerful volcanic eruptions.

To learn more about what the photo reveals, go to:  Spaceweather.com

Tom Tasselmyer