 Discussion: An important technique to estimate the strength of tropical cyclones is known as the Dvorak technique. The Dvorak technique, developed by Vernon Dvorak is a satellite-derived system to estimate storm strength solely based on visible and infrared satellite imagery. The system uses cloud patterns visualized through satellite imagery and can then be used to indirectly measure wind speed and central pressure. Today the Dvorak method is used mainly as verification to measure wind and pressure. This important technique is even used by the National Hurricane Center. What makes this system useful and accurate is because storms with approximately similar intensities were found to contain similar cloud pattern identified on satellite imagery.
0 Comments
 DISCUSSION: Earlier this month, it was discovered that the Geostationary Lightning Mapper (GLM) on the GOES-East satellite had captured some of the first satellite imagery of a phenomenon known as gigantic jet lightning. But what exactly is gigantic jet lightning and how did the GLM “see” it?
Gigantic jets are a type of upper atmospheric lightning, also known as transient luminous events (TLEs). While most TLEs lack many of the characteristics of the lightning we usually see in thunderstorms, gigantic jets are different in that they are connected to the electrical discharges that cause “typical” lightning. In a thunderstorm, a build-up of electrical charges within the cloud leads to the formation of lightning. While the exact mechanism behind this build up of charges is debatable, what is known is that when enough charge is built up, energy is released from the cloud in the form of lightning. Normally we think of lightning as flashes within or between clouds, or as strikes between the cloud and the ground. With gigantic jets, the electrical discharge exits from the top of the cloud into the ionosphere, reaching upwards of 50 miles into the atmosphere. Gigantic jets have been captured in videos and photography for years, but it was only recently that they have been captured on satellite imagery. The GLM on the GOES-East satellite continuously maps and detects lightning over the Americas and surrounding oceans. Lightning strikes and flashes emit light through the top of the cloud, which is detected by GLM and shown in satellite imagery. Since gigantic jets are electrical discharges emitted through the tops of clouds, they too would be detected by the GLM. Furthermore, they would show up even brighter and more intense on satellite imagery than typical lightning flashes, since what is being detected in this case is the electrical discharge itself rather than just the light from the flash emitted through the cloud. Satellite imagery provided by the GLM can be used to help us further understand gigantic jets and other lightning phenomenon. To learn more about other neat observational stories both directly and indirectly related to atmospheric science, be sure to click here! ©2018 Meteorologist Stephanie Edwards 
DISCUSSION: During the course of a given year, there is no question that there is an abundance of evidence proving that Earth effectively has a "living and breathing system" which is in a state of constant flux. This is perfectly illustrated by the fact that as shown in the looped real-color satellite imagery attached above, Earth's oceans and foliage operate as a "filter" to help purify the air surrounding Earth (even in the presence of continued fossil fuel consumption). Thus, Earth's oceans and foliage act as a balancing force in Earth's ability to clear out a solid percentage of man-based consumption of fossil fuels which underlines the importance of protecting the Earth's forests and Earth's oceans. Attached below are some exact excerpts from the actual article which was published by NASA and discusses some of the core principles of this research.
"Carbon naturally cycles through Earth’s environments. Trees and other plants take up carbon dioxide and turn it into the building blocks of roots, stems and leaves. Some of that carbon stays in the soil as the vegetation dies and gets buried. Some is released back into the atmosphere as carbon dioxide through plant respiration, and both carbon dioxide and methane — another potent, carbon-based greenhouse gas — can be released through decomposition, land clearing and wildfire. The ocean absorbs carbon dioxide from the atmosphere, and the tiny water-dwelling plants called phytoplankton take up the gas as well. Over many millennia, the pace of carbon cycling is governed by volcanic emissions and weathering of rocks. For most of human history, carbon has been in a more-or-less steady cycle. This cycle has been thrown off balance as people burn fossil fuels — carbon that has been long buried underground as oil, gas and coal — and as forests are cleared and soils are turned for agriculture. All of these contribute to increasing carbon emissions. While the amount of carbon dioxide emissions that ecosystems absorb from the atmosphere each year varies quite a bit, the fraction in the long run has averaged out to about half. More carbon dioxide and methane in the air means warmer global temperatures. Warmer temperatures can disrupt some ecosystems and impact their ability to absorb more and more carbon. An even more imbalanced carbon cycle will cause greater variability and consequences that are not yet fully understood." To learn more about this particular story as published by NASA, click on the following link: www.nasa.gov/feature/goddard/carbon-climate. To learn more about other neat stories surrounding observations in geo-science, be sure to click on the following link: https://www.globalweatherclimatecenter.com/observations. © 2018 Meteorologist Jordan Rabinowitz   DISCUSSION: Over the past 48 to 72 hours, the Mid-Atlantic and Northeastern regions of the United States have experienced the brunt of a potent Nor'easter. More specifically, this powerful winter storm slammed those areas with strong winds, heavy precipitation (with some locations receiving rain or snow depending on the progress of the storm itself as well as a given location's proximity to the coastal sectors). In addition, closer to the coast, this storm unleashed incredibly large and persistent wave action which ultimately led to major coastal erosion/damage in cities such as (but certainly not limited to) Scituate, Massachusetts where there was tremendous infrastructural damage. Thus, this storm effectively devastated many coastal towns and cities which in some cases may take days or even weeks to fully recover.
Having said that, in the wake of this recent coastal storm's passage, the nation is simply left with scenic low/mid-level satellite imagery containing features most commonly referred to as cloud streets across a good portion of the far Western Atlantic Ocean. Cloud streets are long-distance cloud features which develop as a direct result of cold air moving over relatively long-distances of warmer water (i.e., generally distances of at least 50 to 100 nautical miles). During this process, the colder air parcels are modified by the warmer water they are moving over (in this particular case being the passage of the colder air over the warmer waters of the Gulf Stream off the East Coast of the United States). As these colder air parcels are modified by the warmer water, the air parcels condense into low-level clouds which naturally undergo rising motion due to the warmer air parcels rising higher up into the atmosphere. These low/mid-level clouds move in an outward direction in accordance with the prevailing wind direction in the lowest levels of the atmosphere. Thereby, producing what is visibly observed as cloud streets on both visible and infrared satellite imagery channels. To learn more about other neat observational stories either directly or indirectly connected to meteorology, be sure to click the following link: https://www.globalweatherclimatecenter.com/observations! © 2018 Meteorologist Jordan Rabinowitz 
DISCUSSION: Over the past 24 to 48 hours, the world watched as a historical extra-tropical low-pressure system (more commonly referred to during the Winter-time months as a Nor'easter when positioned along the East Coast of the United States). During the course of the lifetime of this historic nor'easter, there were prolific impacts inflicted across the eastern half of the United States all the way from central/northern Ohio to the Mid-Atlantic and the Northeast regions of the United States. s this began its trail of impacts across parts of central and northern Ohio, more than 200,000 people were left without power within the first few hours of impacts from this powerful Winter storm. The primary power outage catalyst ac as a result of heavy wet snowfall accumulating rather quickly along with blustery winds which aided in the process of downed trees and consequently downed power lines which took out power for many people across northern and central Ohio.
As the storm began to transfer its energy from the Central United States to the East Coast, havoc was quickly unleashed all the way from Virginia and North Carolina to northern New England. This came as a result of a combination of large amounts of heavy/wet snowfall along with incredibly strong winds (in some cases up to and over hurricane force) which subsequently led to widespread power outages across more than 6 states across the Northeast United States. In addition, along coastal regions there was tremendous damage caused by major coastal flooding via a very potent storm surge all the way from coastal Maine to coastal New Jersey. Hence, this was a very far-reaching coastal low-pressure system which ended up being one for the books and will be remembered by many for a long time to come. What made things even more interesting was the latter interaction which occurred between what remained of the powerful coastal low and an upper-level low pressure system positioned over Hudson Bay, Canada. This interaction effectively involved a symbiotic upper-level channel of poleward moisture and energy transport which often with extra-tropical cyclones later in their lifetime as they begin to breakdown and dissipate. However, in the case of this particular Winter storm, there is a blocking high-pressure system positioned to the north of low. Therefore, due to the clockwise flow of the wind streams around the blocking high-pressure system, this facilitated an effective northward moisture transport during the course of the day on Saturday. This process is reflected by the animated infrared satellite imagery attached above. To learn more about other neat stories pertaining to various global meteorological observations, click: https://www.globalweatherclimatecenter.com/observations! © 2018 Meteorologist Jordan Rabinowitz Reflecting on the Historic Launch of the GOES-S Satellite (credit: Meteorologist Jordan Rabinowitz)3/2/2018  DISCUSSION: Earlier on the evening of Thursday (03/01/2017), Cape Canaveral, Florida was the center of focus across the global scientific and non-scientific communities alike. This was a direct result of the fact that Thursday evening marked the launch of NOAA's second next-generation advanced weather satellite imager in GOES-S. The successful launch of the GOES-S satellite marked the continuance of the second of 5 to 6 next-generation satellite imagers which will end up forever changing and revolutionizing the way in which atmospheric scientists visualize and study the atmosphere. It is an incredibly exciting moment in global weather history since when GOES-S becomes fully operational later this year, it will officially pair up with its current operational sister satellite in the form of GOES-16 (formerly GOES-R at the time of its launch back in late November of 2016).
The pairing of having both GOES-16 and GOES-17 at work together will help to further bridge the gaps pertaining to understanding and forecasting the evolution of atmospheric phenomena which impact North America. More importantly, GOES-16 and GOES-17 will further assist atmospheric scientists to better anticipate how atmospheric features and events evolve prior to even reaching parts of Western North America which is a critical aspect of anticipating major events including (but certainly not limited to) Winter-time extra-tropical cyclones (e.g., Nor'easters). To learn more about this particular story, be sure to click on the brief video briefing attached above. To learn more about other neat observational stories both directly and indirectly related to atmospheric science, be sure to click here! © 2018 Meteorologist Jordan Rabinowitz  DISCUSSION: On Thursday, March 1st, 2018, NASA is scheduled to be launching the GOES-S Satellite by using an Atlas V rocket from Cape Canaveral’s Space Launch Complex 41 in Florida. The launch window for the flight is from 5:02 PM to 7:02 PM EST (22:02 to 0:02 UTC). The GOES-S is the newest member of the fourth generation of the GOES Satellite family which started with GOES-R (GOES-16/GOES-East). The GOES satellites are currently being used for satellite imagery to help meteorologists forecast as well as collect data for research including for thunderstorms and cumulonimbus clouds. Among the instruments on board the satellite includes a lightning mapper and a solar imaging suite which covers certain wavelengths of UV and x-ray radiation from the Sun.
The weather conditions for the launch look preferable as the forecast from the NWS office in Melbourne, Florida calls for near-record high temperatures earlier in the afternoon. In addition, light cloud coverage is expected at the time of the launch but will not interfere. The risk of thunderstorms will be minimal as there is going to be about 100 J/kg of CINH (Convective Inhibition), the energy needed to lift an air parcel up to the lifting condensation level adiabatically. The amount of CINH will be strong enough to likely prevent thunderstorms from forming. In addition, a strong westerly dry flow from Central Florida is expected, which would prevent the formation of sea breeze thunderstorms. The rocket, once launched, will have a boost as there will be westerly winds which would help the rocket pitch its angle to be able to get into orbit. The backup launch date is scheduled for the following day, Friday, March 2nd, 2018. The forecast for the backup date looks to be mostly clear as well with a northerly wind instead of a westerly wind. This is due to a cold front that will be marching across Florida on Thursday and Friday. This backup date is in case there is a technical problem with the Atlas V such as fueling or a malfunction that could not be fixed before the original launch window. The GOES-S will not be operational for a few months until it parks in its first spot in orbit to test its functions. Once this test is completed, the GOES-S (now GOES-17) will move to its new spot as it prepares to replace the GOES-15 as the GOES-West satellite in late 2018. The GOES-15 will become a spare satellite once it gets replaced as the GOES-West for a few years. This will allow for a backup if GOES-17 has a problem with instrumentation or if it needs to be turned off for a few days or weeks. To also learn more about other interesting topics pertaining to meteorological observations, be sure to click here! ©2018 Meteorologist JP Kalb Explaining Cloud Streets over the Western Atlantic Ocean (credit: GOES-16 via College of Dupage)2/2/2018  
DISCUSSION: As we continue to get deeper into the heart of the 2017-2018 Northern Hemispheric Winter season, we are continuing to see various atmospheric phenomena on finer spatial scales than has ever been observed in recorded history. This ability to visualize such fine-detail various global atmospheric phenomena is due to the relatively newer onset of the GOES-16 satellite imaging platform which was officially launched back in late November 2016. Needless to say that this was a dramatic turning point for the atmospheric science forecasting and research worlds alike through opening a new world into understanding the inner-workings of atmospheric flow regimes and dynamics therein.
One such example of a finer-scale atmospheric phenomenon which has effectively been revolutionized in terms of our ability to study it is the occurrence of Winter-time cloud streets. As circled in the upper-most image attached above, the brief animated infrared satellite imagery loop attached in the file above, and discussed in the brief video briefing also attached above, cloud streets are quite common during the Winter-time months. This is chiefly due to the fact that cloud streets form over open ocean basins just offshore from larger land-masses in the same manner that lake-effect clouds and lake-effect snow bands form off of relatively warmer lakes located all over the world. Hence, this is how countries such as Taiwan and Japan experience ocean-effect snowfall during the Winter-time months as well via the mechanics of ocean-effect snow which is predominantly driven by the occurrence of more intense cloud streets. To learn more about cloud streets, feel free to watch the brief video briefing attached above. To also learn more about other interesting topics pertaining to meteorological observations, be sure to click here! © 2018 Meteorologist Jordan Rabinowitz  Being a weather observer presents an interesting opportunity to those studying Meteorology at Rutgers University. Many times, meteorologists are stuck behind a computer, looking at numbers, data, and previously-made observations. To physically record and experience a tangible observation in front of you, however, is something different. At Rutgers University, weather observers are given this opportunity. Eight AM each morning is the starting time for the observers. When entering the gated area, observers will grab the observation sheet where everything is recorded (as can be seen below), and get to work. The first observation, temperature, is measured in three ways. The first way is by simply going online to the Rutgers Weather Center and reading the current, maximum, and minimum temperature, provided by the Campbell thermometer. The second method is to look at the electronic Maximum Minimum Temperature System (MMTS), nicknamed “Nimbus”, which keeps a record of the highest and lowest temperature since the last time the reset button was hit.  The third method of measuring temperature, which is perhaps the most archaic but most hands-on experience, is to check is the liquid thermometers. While these observations are likely not used for official temperatures (since an improper reset of the thermometers or even breathing on them could alter the temperature), they are always there as a backup in case a power outage ever hit Rutgers Gardens, and are always checked as well. Located in a Stevenson screen (pictured below, both open and closed) as to not be affected by the sun’s rays, observers will find both a maximum and minimum liquid thermometer in here. Beyond air temperature, observers make sure to log soil temperature at different depths (two inches, four inches, and eight inches), with different types of soil (bare or grassy).
Precipitation is the next observation made. A metal can at the western side of the enclosed area is used to catch any precipitation falling in the past twenty-four hours. When there is only rain, the job is easy. Liquid is transferred from the metal can into a National Weather Service (NWS) standard rain gauge and a ruler is used to measure the amount of liquid to the nearest hundredth of an inch. When there is snow, the process is a little different. Snow is first measured with a classic yardstick to get the depth of the snow that fell in the past twenty-four hours. Then, the snow is melted on an electric stove so that the liquid precipitation equivalent can be measured. After precipitation, the observer must write down other observations such as sky cover, current weather, and ground condition. Evaporation is also measured in the summer by using a hook gauge, a very precise device that can measure the change in depth of water (in an evaporation pan) to the nearest thousandth of an inch. By measuring this daily change of water, observers can approximate how much water evaporated in the past twenty-four hours. See below for a run-down of the observations collected at Rutgers Gardens, courtesy of the Rutgers Weather Center!  After the entire process is completed, the observer uploads the information online. All records of Rutgers Gardens observations from students can be found here for the interested reader.
To learn more about other stories related to wide world of weather observations, be sure to click here! Photo Credit to Forecaster Joseph DeLizio ©2018 Forecaster Joseph Fogarty  DISCUSSION: As we have enjoyed the spoils of the GOES-16 satellite over the course of the past year (which was formerly GOES-R prior to it's launch), the atmospheric science community has yet another satellite launch to get excited for. This particular point of excitement is the upcoming launch of the GOES-S (i.e., soon to be the GOES-17 satellite imager) which will further revolutionize the way in which the world studies the atmosphere. This just goes to show that irregardless of what different people are trying to achieve outside of science, the science world is clearly leaning towards the way of progress. To learn more about this upcoming satellite launch, watch the short video briefing attached above.
To learn more about other neat stories pertaining to weather observations, be sure to click here! ©2017 Meteorologist Jordan Rabinowitz |
Archives
January 2019
|
||||
RSS Feed