November 19th has been eagerly anticipated by the meteorological community as it is the launch of the next-generation GOES-R satellite. The satellite will carry a suite of space weather instruments as well as two Earth observing sensors. The Advanced Baseline Imager (ABI) will provide three times more channels to view the Earth, four times greater spatial resolution, and 5 times faster coverage. The ABI will provide new means to monitor atmospheric phenomena. Additionally, GOES-R will carry the first ever lightning observation sensor on a geostationary platform; the Geostationary Lightning Mapper (GLM). Numerous organizations, including NASA SPoRT, have been supporting the GOES-R Proving Ground for many years to aid the operational community in preparing for the new capabilities of GOES-R.
Specifically, NASA SPoRT has been formally involved with the Proving Ground since 2009, although much of our work prior to this point has provided relevant information with respect to GOES-R. SPoRT has been primarily involved in two activities. The first has been the assessment of and training for multi-spectral imagery, often called red-green-blue (RGB) composites. The RGB composites are used to combine multiple single channels into a single image in order to help emphasize phenomena that forecasters wish to monitor. This can range from air mass microphysics to atmospheric dust. This work has leveraged work by Europe’s EUMETSAT organization who first developed several of these RGB composites for their Meteosat Second Generation satellite. SPoRT has worked with NASA’s MODIS instruments from Aqua and Terra as well as the JPSS VIIRS instrument to create the respective RGBs from polar orbiting instruments. These snapshot demonstrations provided forecasters local examples of RGB composites to allow them to investigate these products prior to GOES-R’s launch. SPoRT has also coordinated with other product developers to help transition their early development work to National Weather Service forecasters. This included the University of Alabama in Huntsville’s GOES-R convective initiation product and the NESDIS quantitative precipitation product.
MODIS Dust RGB demonstrating a future capability of the GOES-R ABI. Dust (magenta) can be seen approaching Las Vegas, Nevada.
In additional to the ABI work, SPoRT has been integral to supporting total lightning (intra-cloud and cloud-to-ground) observations in operational applications. This dates back to 2003 with the first transition of experimental ground-based lightning mapping arrays that evolved into the pseudo-geostationary lightning mapper (PGLM) product in 2009 to provide operational training for the GLM. Since then, SPoRT has developed the GLM plug-in for the National Weather Service’s AWIPS system, has personnel serving as the National Weather Service liaison for the GLM, and have developed foundational training that is being provided to every forecaster in the National Weather Service.
Sample of the pseudo-geostationary lightning mapper demonstration product in AWIPS being used for training on the Geostationary Lightning Mapper.
SPoRT will continue to be actively engaged in GOES-R applications post launch. This will take the form of developing an applications library, or short 3-5 focused case examples, for both the ABI RGBs and the GLM. SPoRT will also participate in the formal applications training for RGBs and GLM that will be released to the National Weather Service. Lastly, SPoRT will be leading an operational assessment of the GLM with National Weather Service forecasters and associated emergency managers.
GOES-R launching on November 19, 2016!
Posted in GOES-R Proving Ground, Lightning Mapping Array, RGBs, Uncategorized | Tagged ABI, GLM, GOES-R, RGB | Leave a Comment »
Today, the GOES-R satellite launched from Kennedy Space Center at approximately 642 EST! As a forecaster, I am very excited about the flow of data and imagery that will be available to us in the near future. Congratulation to all those who have invested so much time and energy into this project.
The GOES-R satellite launches aboard an Atlas-V Rocket at Kennedy Space Center, approx 642 pm EST.
SPoRT would like to thank our collaborators who have worked with us to develop forecasting and other applications for this mission during recent years. And we look forward to continued collaborative projects in the future!
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A number of fires have erupted in recent weeks due in part to the drought gripping parts of the Southeast U.S. Especially hard hit are areas in and around the southern Appalachians, extending into central portions of Alabama and Georgia, where D3 (Extreme) to D4 (Exceptional) drought conditions exist, per the latest U.S. Drought Monitor (Image 1).
Image 1. U.S. Drought Monitor for 8 November 2016. Notice the large area of D3-D4 drought gripping parts of the Southeast.
Recently, the fires and some smoke were captured well in Shortwave IR (Image 2) and Day-Night Band imagery (Image 3) produced by the VIIRS instrument onboard the Suomi NPP satellite.
Image 2. Fires appear as small black dots in the Shortwave IR (~3.7 um) imagery taken at 0734 UTC 15 Nov 2016.
Image 3. In this Day-Night Band Radiance RGB, the fires (center of white circles) appear similar to city lights, however smoke plumes are evident with some of the stronger and heavier smoke-producing fires (red ovals), 0734 UTC 15 Nov 2016
Since boundary layer winds tend to shift direction at night with the loss of deep mixing, the Day-Night Band image can be used by forecasters to detect how smoke plumes change direction at night and may help with forecasts of smoke impacts.
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Major Hurricane Matthew left a trail of destruction in its wake from the Caribbean up through the U.S. East Coast. As Hurricane Matthew tracked northward along a large portion of the U.S. Southeast Coast from Florida to North Carolina, the rainfall impacts worsened. Figure 1 shows the weekly rainfall spanning 4-11 October, ranging from ~2-8 inches along the Florida East Coast to 10-20 inches in the eastern Carolinas. Since antecedent soil moisture was highest in the eastern Carolinas (Fig. 2), the extreme rainfall led to the most serious flooding in this area.
Fig. 1. Weekly rainfall totals from 4 – 11 October 2016.
Fig. 2. Total Column (0-2 m) relative soil moisture prior to Hurricane Matthew’s impact on North and South Carolina, valid at 0000 UTC 7 October 2016.
Referring back to the precipitation totals in Fig. 1, we can see that there was a sharp rainfall gradient on the northwestern edge in the Middle Atlantic region. Interestingly, this gradient in Hurricane Matthew’s rainfall coincided with a pre-existing transition zone between wet conditions near the Atlantic coast and drought conditions further inland from the Appalachians through New England. The net result was to accentuate the wet-dry contrast already in place. The animation in Fig. 3 highlights this contrast nicely by presenting the SPoRT-LIS daily total-column relative soil moisture percentiles from 1-12 October. The percentiles are based off a 1981-2013 daily soil moisture climatology that SPoRT produced from its ~3-km resolution SPoRT-LIS simulation. By 9 October, notice the incredible transition from excessively wet soil moisture exceeding the 98th percentile (Carolinas through the southern half of Delaware) to extremely dry soil moisture less than the 5th percentile across Pennsylvania into the Northeast (as well as much of the inland Southeastern U.S.). In fact, total column soil moisture values are less than the 2nd percentile over a large part of Ohio, Pennsylvania, New York, and the New England states, indicative of the ongoing severe drought there.
Fig. 3. Daily animation of SPoRT-LIS total column relative soil moisture percentile from 1 to 12 October 2016.
Posted in Disasters, Land Information System (LIS), Modeling, QPE | Leave a Comment »
CrIS/ATMS soundings processed through the NOAA Unique Combine Processing System (NUCAPS) are available in AWIPS. SPoRT is working with the Joint Polar Satellite System (JPSS) Proving Ground to testbed the utility of NUCAPS soundings to anticipate hurricane tropical to extratropical transition. Although satellite derived soundings are “smoother” than radiosondes they can provide valuable information about the depth of moist or dry layers in data sparse regions. Forecasters can anticipate extratropical transition by identifying the dry slot and upstream potential vorticity anomalies on satellite imagery that may interact with a storm while also considering many other factors that lead to extratropical transition. Although Hurricane Matthew is not expected to undergo extratropical transition for quite a few days, the NUCAPS Soundings can be used to diagnose the temperature and moisture characteristics surrounding the hurricane as highlighted below.
GOES-13 water vapor imagery shows dry upper levels west of Hurricane Matthew and abundant moisture surrounding the system (Fig. 1). Since water vapor imagery can only detect moisture characteristics in the mid-to upper- levels of the atmosphere, the NUCAPS soundings (green dots on Fig. 1) can be analyzed to provide more information about the vertical extent of the dry air and whether it is in close proximity to the hurricane in the mid- to lower- levels.
Fig. 1. 5 October 2016 1830 UTC GOES-13 water vapor imagery and 1811 UTC NUCAPS Soundings. Green dots represent point and click soundings. Blue numbers label location of example soundings highlighted below.
Scroll down through the example Soundings to compare the changes in moisture conditions west of Hurricane Matthew. Soundings 1 and 2 (Fig. 2 and 3), taken in a region of dry air as identified by the orange color enhancement on the water vapor imagery, confirm a dry column throughout the depth of the atmosphere. Sounding 3 (Fig. 4) shows the drying is not as intense in the upper-levels and mid-level drying extends down to about 600 mb. Sounding 4 and 5 (Fig. 5 and 6) show upper level conditions are more moist closer to the hurricane, as expected from the water vapor imagery. While Sounding 4 (Fig. 5) shows moist conditions throughout the atmospheric column, Sounding 5 (Fig. 6) does show mid-level dry air is present. Previous analysis of Sandy 2012 and Arthur 2014 showed the same signature (e. g., similar to Sounding 5) became more abundant surrounding the systems as upper-level dry air intruded. Currently, there are very few soundings with this signature surrounding Hurricane Matthew. The NUCAPS soundings confirm dry atmospheric conditions are well west of the system and there is very little mid- to low- level dry air in the proximity of the system. This preliminary example is presented but as Hurricane Matthew continues to evolve NUCAPS Soundings and SPoRT Ozone Products will be analyzed to discern the utility for anticipating dry air intrusion and associated hurricane tropical to extratropical transition.
Fig. 2. 5 October 2016 1811 UTC NUCAPS Sounding at Location 1.
Fig. 3. 5 October 2016 1811 UTC NUCAPS Sounding at Location 2.
Fig. 4. 5 October 2016 1811 UTC NUCAPS Sounding at Location 3.
Fig. 5. 5 October 2016 1811 UTC NUCAPS Sounding at Location 4.
Fig. 6. 5 October 2016 1811 UTC NUCAPS Sounding at Location 5.
Posted in ATMS, AWIPS II, CrIS, GOES Products, JPSS Proving Ground | Leave a Comment »
So, we’ve finally begun the process of transitioning over fully to the new CONUS version of the SPoRT LIS. This “new” version of the SPoRT LIS has been under development actually for several years now, and underwent initial testing and evaluation at the Huntsville WFO in spring 2015, followed by an evaluation by several WFOs and RFCs in summer 2015. Image 1 below shows the differences in the domains. The new version of the SPoRT LIS encompasses the entire CONUS and surrounding areas of southern Canada and northern Mexico, albeit with some anticipated degradation especially in the border regions due to lack of consistent radar/precipitation coverage.
Image 1. The CONUS SPoRT LIS (left) and the approximate domain of the old Southeast CONUS version (right). Note: the images are from different periods.
Not only does the CONUS version offer a geographic expansion over the previous version of the LIS, but new variables are a part of the new SPoRT LIS, including 0-200 cm relative soil moisture changes on several timescales (weekly, bi-weekly, monthly, seasonal, semi-annual and annual) soil moisture percentiles and soil temperatures. The soil moisture percentiles and change values can be especially useful for the drought designation and analysis process, and have been used in this capacity at the Huntsville office since their inception. Of course, there are other applications for hydrology, fire weather and blowing dust. We’re planning to explore more of these latter unique and interesting applications with several of SPoRT’s collaborative Western CONUS WFOs next spring and summer. The SPoRT LIS soil temperature data have shown promising application for impacts during winter weather events during evaluation of a few events in the previous winter, with more evaluation expected during the upcoming winter. In addition to the new variables, the new version of the SPoRT LIS is using NSSL’s Multi-Radar Multi-Sensor data for precipitation forcing in the near term and is also solely incorporating the VIIRS GVF over the legacy MODIS GVF.
Image 2. Examples of SPoRT LIS 0-200 cm relative soil moisture weekly change (left) and 0-200 cm relative soil moisture percentile (right)
Users of the SPoRT LIS and GVF data for their local modeling purposes will need to make the appropriate changes to their EMS/UEMS model runs to properly incorporate these new data sets. Please contact Jon Case at SPoRT or me (Kris White) if you have any questions. Thanks for reading!
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Working midnight shifts this past weekend, I had the opportunity to take a look at the VIIRS Day-Night Band Imagery for the detection and analysis of fog. Early Monday morning, the observation at Ft. Payne was indicating fog with 1/2 statute mile visibility. However, the presence of thin cirrus over parts of the area did not allow for the observation of ground phenomena, including fog, in the region via traditional Shortwave IR imagery (Image 1). However, low clouds and fog were observed in the VIIRS Day-Night Band imagery since the cirrus were sufficiently translucent in the visible portion of the spectrum (Image 2).
Image 1. VIIRS 3.9 µm IR image provided by NASA SPoRT, valid 0728 UTC 22 Aug 2016. Fog cannot be observed in the 3.9 um imagery since the cirrus are sufficiently opaque at this wavelength.
Image 2. VIIRS Day-Night Band Reflectance provided by NASA SPoRT, valid 0728 UTC 22 August 2016. Fog can be seen in the narrow Paint Rock Valley of western Jackson County (in northeastern Alabama). Despite the observation of fog at Ft. Payne (DeKalb County AL, –located to the SE of Jackson County), fog cannot be readily observed in the imagery, suggesting that the fog was very localized and perhaps shallow.
I could show the standard fog product imagery (11-3.9 µm), but the story is essentially the same as that of the 3.9 µm imagery of course. The ability to see through thin cirrus is one of the primary advantages offered by the VIIRS Day-Night Band imagery and thus is among its most useful applications, operationally speaking. These imagery are a part of the JPSS Proving Ground and have been available in AWIPS here at the HUN office for several years now, including other SPoRT collaborative partners.
In this particular case, it was operationally advantageous to see that the extent of the fog was not widespread and was just confined to some of the more fog-prone valley locations, especially the Paint Rock Valley, and may have only been highly localized to Ft. Payne, or even just the Ft Payne airport observation location. Had the fog been observed through a larger area in Jackson and especially in DeKalb Counties, then a dense fog advisory might have been necessary.
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