You are browsing the archive for weather Archives - AGU Blogosphere.
21 July 2015
Benjamin Franklin was the first to surmise that, even on a hot summer’s day, the raindrops falling on our heads might begin life as ice particles at high altitudes. In the centuries since 1780 it became possible to probe the atmosphere directly by balloon and by aircraft, and remotely from the ground and from satellites. These observations confirmed Franklin’s suspicion. However, two questions remain: how large are the fractions of rain produced by liquid clouds and by ice clouds? And how variable are they over the globe and over time?
29 April 2015
For the last nine years the United States has dodged the hurricane bullet: No major tropical cyclones have made U.S. landfall. Such a remarkable “hurricane drought” has never been seen before – since records began in 1851. It beats the previous record of eight years from 1861-1868, say researchers who have looked into the probabilities of the unusual streak, what it means for the chances of hurricanes this year and whether or not insurance premiums reflect the risks. Their conclusion: the hurricane drought is mostly a matter of dumb luck.
27 April 2015
A paper in Nature Climate Change today is getting international press and for good reason, It contains a rather astounding statistic. Here is a quote from the beginning of the paper with my highlights in red: Climate change includes not only changes in mean climate but also in weather extremes. For a few prominent heatwaves and heavy precipitation events a human contribution to their occurrence has been demonstrated1, 2, 3, 4, 5. Here we …
10 April 2015
Torrential rains inside hurricanes might be acting as a control knob on these giant storms, reducing their intensity by as much as 30 percent, according to a new study.
18 March 2015
Earth just had it’s warmest winter on record, and this past February was the second warmest on record. This from NOAA/NCDC During February, the average temperature across global land and ocean surfaces was 1.48°F (0.82°C) above the 20th century average. This was the second highest for February in the 1880–2015 record. The highest temperature occurred in 1998, at 1.55°F (0.86°C) above average. During February, the globally-averaged land surface temperature was 3.02°F …
6 March 2015
This is from the NASA Terra Satellite today March 6, 2015. Click for a size large enough to print.
27 January 2015
We are at the cusp of some amazing technology that will hopefully make forecasting snowstorms, like the one predicted yesterday, much more accurate. I was on a local program produced by the TV station I work for (WBOC-TV) last week, and I showed a couple of smart phone apps that may eventually make a real difference in forecasting. Making better forecasts requires higher resolution models and that means more data …
14 January 2015
In a recent study, University of Montana and Montana Climate Office researcher Jared Oyler found that while the western U.S. has warmed, recently observed warming in the mountains of the western U.S. likely is not as large as previously supposed.
13 January 2015
The AGU meeting every December in San Francisco is truly an amazing experience, and while I only was able to be there for two days, it was well worth flying across the entire continent and back in 48 hours. Here are some sights and sounds from the AGU that I and others made. Up first is meeting Geoph Haines-Stiles one of the senior producers of the original COSMOS with Carl …
9 January 2015
The Suomi satellite has the ability to get images of the Earth at night, and this week it grabbed one of the prettiest shots yet, under the light of a full Moon. With clear skies and snow on the ground, you can see the snow and if you look closely you can see some high clouds on top of the lights across portions of Iowa and Minnesota. You can get a much …
A new study in Geophysical Research Letters offers for the first time unequivocal evidence that large storms move significant amounts of ozone from the stratosphere down to the troposphere, the lowest part of the atmosphere.
11 December 2014
Departures were being delayed from the U.S. to the UK to keep aircraft from arriving to early in Europe. You have to feel for the folks flying from Heathrow to Seattle though; add two hours to an already LONG flight! I experienced this once on a flight from Atlanta to London, and arrived an hour early. We sat on the plane though waiting for a gate to open up!
2 December 2014
Heavy rain and snow is moving into California tonight, as an intense surface/upper level low pressure system taps warm tropical air to the south and shoves it into California. California gets most of its rain in winter and you might be surprised to know that most if it comes from just 5-6 storms. The water vapor imagery from the GOES shows the storm well. Keep in mind that you are …
24 November 2014
The Governor of New York, Andrew Cuomo, really stepped in it on Saturday. He’s now getting a firestorm of criticism, and he deserves every bit of it, but I want you to understand why before I go into what he said. There is an old rule among weather forecasters, and it goes like this- “Never forecast a record, you will probably be wrong!”. Now I, and many others, have broken …
14 November 2014
There are growing sign,s that after one more blast of even colder air next week, we will see some much warmer air over the Central and Eastern U.S. as we head into Thanksgiving. Indian summer may be on the way! The forecast below is based on an average of many long-range model runs of the Climate Forecast System. Research shows that an average of model runs provides a more accurate …
23 October 2014
A low-end nor’easter is bringing wind and rain to much of the Northeast U.S. this evening, and Gale Warnings have been posted in the Atlantic as well. As nor’easters go, this is not really a big one, and we will see far worse over the coming months, with some of them bringing snow instead of rain.This is what I told my viewers here in Maryland/ Delaware, and so did many …
8 October 2014
New research finds that it’s not just the amount of rain that falls on a hillside, but the pattern of rainfall that matters when trying to determine how likely a slope is to give way. This new information could improve forecasts of landslides, which are typically hard to predict, said the scientists conducting the research.
Different rainfall patterns—a short, heavy deluge, a light, steady downpour, or sporadic showers—will trigger different numbers of landslides with varying amounts of debris, according to the new study published today in Water Resources Research, a journal of the American Geophysical Union.
7 October 2014
Researchers have developed a new avalanche monitoring method that uses sound below the range of human hearing to detect and track these deadly and destructive snow slides. The technique can detect an avalanche from the moment it starts, picking up the unheard thump of a rupture in the snowpack that can precede the snow cascade. It can then track the avalanche’s path second by second down the mountain.
In a new study published last month in Geophysical Research Letters, a journal of the American Geophysical Union, scientists report using an array of infrasound detectors on a mountainside to pick up low-frequency sound waves emitted from one of a series of January, 2012, avalanches in Idaho’s Canyon Creek corridor.
6 October 2014
This December, USGS will release a beta version of interactive computer models created from data collected by that laser-equipped plane—known as the second generation Experimental Advanced Airborne Research Lidar (EAARL-B)—and other equipment that mapped and monitored the New Jersey coast. The online portal will allow anyone to look at storm intensities and directions, evaluate wave attack scenarios and coastal vulnerabilities, and anticipate the impacts to landscapes ahead of time, said Neil Ganju, a USGS research oceanographer, at a 19 September congressional briefing on the Department of the Interior’s response to Hurricane Sandy.
26 September 2014
Here are the particulars of the image, and what you are seeing from NASA Earth Observatory: More dust blows out of the Sahara Desert and into the atmosphere than from any other desert in the world, and more than half of the dust deposited in the ocean lifts off from these arid North African lands. Saharan dust influences the fertility of Atlantic waters and soils in the Americas. It blocks or reflects …