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  • November « 2011 « CIMSS Satellite Blog
    and GOES 15 0 63 µm visible images click image to play animation A 250 meter resolution MODIS true color Red Green Blue RGB image from the SSEC MODIS Today site below revealed more complex details about the structure of the blowing dust features MODIS true color Red Green Blue RGB image AWIPS images of GOES 11 0 65 µm visible channel data with an overlay of MADIS 1 hour interval satellite winds below indicated that the airborne dust feature was moving southwestward at speeds of 15 20 knots GOES 11 0 65 µm visible images MADIS satellite winds A comparison of 1 km resolution MODIS 0 65 µm visible channel 3 7 µm shortwave IR channel and 11 0 µm IR window channel images below showed that 1 the thickest portions of the blowing dust plumes appeared several degrees warmer darker black enhancement on the shortwave IR channel image due to reflection of incoming solar radiation off the small airborne dust particles and 2 swaths of land which had significant amounts of blowing dust overhead exhibited a slightly cooler lighter gray enhancement signaure on the IR window channel image since the dust was reducing the amount of solar radiation reaching the surface MODIS 0 65 µm visible 3 7 µm shortwave IR and 11 0 µm IR window images In fact the corresponding 1 km resolution MODIS Land Surface Temperature LST product below displayed LST values in the 80s F in areas beneath the blowing dust plumes in contrast to LST values in the 90s to around 100º F over adjacent areas MODIS 0 65 µm visible channel MODIS Land Surface Temperature product CIMSS participation in GOES R Proving Ground activities includes making a variety of MODIS images and products available for National Weather Service offices to add to their local AWIPS workstations Currently there are 49 NWS offices receiving MODIS imagery and products from CIMSS Posted in GOES 11 GOES 15 GOES R MODIS Red Green Blue RGB images Satellite winds No Comments Blowing dust in west Texas November 26th 2011 GOES 13 0 63 µm visible channel images Strong northerly winds in the wake of a cold frontal passsage caused widespread blowing dust across parts of west Texas during the afternoon hours on 26 November 2011 The hazy plumes of blowing dust could be seen on GOES 13 0 63 µm visible channel images above At Midland Texas located near the center of the images the winds gusted to 51 mph and surface visibility was reduced to 0 5 mile at times After sunset when visible imagery was no longer available the southward progress of the airborne dust could still be tracked using a GOES 11 IR difference product below created by subtracting the 12 0 µm IR brightness temperature from the 10 7 µm IR brightness temperature The larger IR difference values around 2 3 degrees Kelvin yellow color enhancement represented the portions of the airborne dust cloud that were the most concentrated GOES 11 0

    Original URL path: http://cimss.ssec.wisc.edu/goes/blog/archives/date/2011/11 (2012-11-14)
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  • October « 2011 « CIMSS Satellite Blog
    this second RGB image and cloud features which again appeared as lighter shades of white MODIS visible and false color Red Green Blue RGB image 18 13 UTC and 19 53 UTC MODIS false color RGB images Some of the snow cover began to melt during the day across eastern Colorado as could be seen in a comparison of the 18 13 UTC 12 13 PM local time and 19 53 UTC 1 53 PM local time MODIS false color RGB images above GOES 15 0 63 µm visible channel images at 15 minute intervals below click image to play animation more clearly showed the temporal evolution of the melting snow cover GOES 15 0 63 µm visible channel images click image to play animation CIMSS participation in GOES R Proving Ground activities includes making a variety of MODIS images and products available for National Weather Service offices to add to their local AWIPS workstations Currently there are 49 NWS offices receiving MODIS imagery and products from CIMSS Posted in GOES 15 GOES R MODIS Red Green Blue RGB images Winter weather No Comments Hurricane Rina October 24th 2011 GOES 13 0 63 µm visible channel images ASCAT scatterometer surface winds Tropical Storm Rina rapidly intensified CIMSS ADT plot to hurricane intensity off the coast of Honduras on 24 October 2011 GOES 13 0 63 µm visible channel images with an overlay of ASCAT scatterometer surface winds from the CIMSS Tropical Cyclones site above showed that Hurricane Rina exhibited a central dense overcast early in the day with convective bursts near the center of the circulation A longer animation of GOES 15 10 7 µm IR channel images below click image to play animation revealed a number of convective bursts with large areas of the central dense overcast exhibiting cloud top IR brightness temperatures of 80ºC or colder violet color enhancement GOES 15 10 7 µm IR channel images click image to play animation AWIPS images of the MIMIC Total Precipitable Water TPW product below click image to play animation suggested that Hurricane Rina may have been tapping moisture from the Eastern Pacific Ocean Intertropical Convergence Zone Monsoon Trough MIMIC Total Precipitable Water product tropical surface analysis click image to play animation It is interesting to note that an increasing pressure gradient between high pressure located over the Gulf of Mexico and the deepening circulation of Hurricane Rina was beginning to enhance the intensity of dry Tehuano gap winds flowing southward into the Gulf of Tehuantepec below MIMIC TPW Tropical surface analysis ASCAT scatterometer surface winds 25 October Update NOAA 16 false color Red Green Blue RGB image On 25 October 2011 widespread high altitude cirrus transverse banding was seen along the western periphery of Hurricane Rina on a 1 km resolution NOAA 16 false color Red Green Blue RGB image above created using AVHRR visible channels 1 0 63 µm and 2 0 86 µm along with IR channel 4 10 8 µm 4 km resolution GOES 13 6

    Original URL path: http://cimss.ssec.wisc.edu/goes/blog/archives/date/2011/10 (2012-11-14)
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  • September « 2011 « CIMSS Satellite Blog
    the tropopause was lower in the vicinity of the cut off low GOES sounder Total Column Ozone product click image to play animation One notable impact associated with this cut off low included thunderstorms along the Lake Michigan shoreline that produced a number of waterspouts that were seen from Milwaukee to Chicago A comparison of MODIS 0 65 µm visible channel and 11 0 µm IR window channel image at 17 28 UTC 12 28 pm local time on 24 September below showed one of the storms that exhibited cloud top IR brightness temperatures colder than 40ºC blue color enhancement along with a number of cloud to ground lightning strikes as it moved inland MODIS 0 65 µm visible channel and 11 0 µm IR window channel images Another impact of this cut off low included a number of pilot reports of light to moderate turbulence over the central and southern Great Plains region A well defined bloom of cirrus clouds developed within a zone of high 400 200 hPa layer wind shear as seen on 4 km resolution GOES 13 6 5 µm water vapor channel images with overlays of CRAS model fields below click image to play animation GOES 13 6 5 µm water vapor images turbulence reports CRAS layer winds and shear click image to play animation Better detail of the banded structure of the cirrus cloud features within the high shear deformation zone can be seen on a 1 km resolution MODIS 6 7 µm water vapor image below Note the pilot report of light to moderate turbulence during the entire flight from Denver DEN to Kansas City MCI MODIS 6 7 µm water vapor image pilot reports of turbulence A sequence of 1 km resolution MODIS 6 7 µm water vapor channel images on 26 September below showed some very intricate dry air and moisture structures within the cut off low during that particular day MODIS 6 7 µm water vapor channel images In a comparison of MODIS 0 65 µm visible channel and MODIS 6 7 µm water vapor channel images below note how much more structure is seen in the water vapor image even in areas that are cloud free in the visible image This allows a number of water vapor features and gradients to be tracked using 3 consecutive GOES water vapor images to produce MADIS high altitude atmospheric motion vectors AMVs that can provide important wind direction and wind speed data An AMV with a wind speed of 130 knots at 300 hPa was seen in the dry slot over southern Missouri MODIS 0 65 µm visible image MODIS 6 7 µm water vapor image MADIS satellite winds Posted in Aviation GOES sounder GOES 13 GOES 15 Lightning MODIS Satellite winds No Comments Autumn tree colors and a large fire burn scar in northeastern Minnesota September 26th 2011 MODIS true color and false color Red Green Blue RGB images A comparison of 250 meter resolution MODIS true color and false color

    Original URL path: http://cimss.ssec.wisc.edu/goes/blog/archives/date/2011/09 (2012-11-14)
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  • August « 2011 « CIMSS Satellite Blog
    diagnosed using MSG data at this site above show a decrease in OT generation over the center of the system today coincident with warming of the cloud tops Variability in the number of OTs is common as shown here Posted in General interpretation GOES 13 Severe convection Tropical cyclones No Comments Hydrological impacts of Hurricane Irene August 29th 2011 MODIS true color images 16 August and 28 August 2011 Heavy rainfall associated with Hurricane Irene included 20 40 inches at Virginia beach Virginia and 20 00 inches at Jacksonville North Carolina HPC summary Winds gusted as high as 115 mph at Cedar Island North Carolina The effects of the heavy rain and strong winds can be seen in a before after comparison of 250 meter resolution MODIS true color Red Green Blue RGB images from the SSEC MODIS Today site above On the before image 16 August 2011 there was a large smoke plume seen from a fire that was burning in the Great Dismal Swamp area in far southeastern Virginia on the after image 28 August 2011 water turbidity was significantly enhanced due to suspended sediment across the Outer Banks region of North Carolina and a narrow filament of sediment was being actually being entrained into the flow of the Gulf Stream AWIPS images of the corresponding MODIS 0 65 µm visible channel data and the MODIS Sea Surface Temperature SST product below showed that the enhanced turbidity features seen on the MODIS true color image generally exhibited slightly cooler SST values in the middle to upper 70s F blue color enhancement compares to the waters located closer to the Gulf Stream SST values in the lower 80s F darker red color enhancement MODIS 0 65 µm visible channel image MODIS Sea Surface Temperature image Farther to the north another before after MODIS true color image comparison revealed additional areas of sediment being carried off the coast of the Northeast US below Also note that there was a great deal of sediment in the Hudson River perhaps better seen in this 20 August 29 August comparison MODIS true color images 26 August and 29 August 2011 Posted in General interpretation Heavy rain flooding Hydrology MODIS Red Green Blue RGB images No Comments Older Entries Webmaster Follow us on Search for Pages About this site CIMSS Satellite Proving Ground Contact us Mobile users POES AVHRR in AWIPS SatePedia Suomi NPP JPSS Proving Ground VISIT SHyMet Training Topics August 2011 M T W T F S S Jul Sep 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 Categories Air quality Antarctic Arctic AVHRR Aviation AWIPS II Calibration Anomalies Cloud Top Cooling Convective Initiation Fire detection Fog detection General interpretation GOES sounder GOES 10 GOES 11 GOES 12 GOES 13 GOES 14 GOES 15 GOES R Google Earth Heavy rain flooding Historical Hydrology Lightning Marine weather McIDAS V Meteosat

    Original URL path: http://cimss.ssec.wisc.edu/goes/blog/archives/date/2011/08 (2012-11-14)
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  • July « 2011 « CIMSS Satellite Blog
    Sea into the southern Gulf of Mexico Late in the day on 27 July Air Force Reconaissance found a closed circulation with winds that were strong enough to earn the system a tropical storm designation GOES 15 Visible Image 2245 UTC 27 July Visible imagery from late in the day above on the 27th shows extensive convection with some overshooting tops over the Yucatan Channel and over the adjacent landmass Forecasts are for Don to strengthen slowly as it moves towards the west northwest Oceanic heat content estimates from RSMAS as displayed at the CIMSS Tropical Weather website show a region of high heat content associated with the Loop Current in the Gulf of Mexico north of the projected path of Don Intensification of Don could be more rapid if the storm moves farther to the north over the region of higher heat content Shear values around Don are low That and the warm sea surface temperatures over the Gulf argue for slow intensification Don s projected path into south Texas takes it to a region suffering from extreme drought as shown here Posted in General interpretation GOES 15 Tropical cyclones No Comments GOES 15 is out of storage July 27th 2011 GOES 15 GOES 13 Sounder loop The earth viewing instruments on the GOES 15 spacecraft which is above 90 W longitude were turned on July 25th and will be sending Imager and Sounder data for the next two weeks Satellites in storage are periodically awakened to test functionality GOES West currently GOES 11 will be retired at the end of the year and GOES 15 is a candidate to replace that Geostationary Satellite at 135 W Longitude The above loop shows Sounder data from GOES 15 and GOES 13 both remapped to the same projection for 1746 UTC on July 27th Note that the most bands of the Sounder imagery from GOES 15 shows cleaner signals colder detectors onboard GOES 15 because GOES 15 has a different configuration than GOES 13 mean that the same signal has less noise Visible imagery from GOES 15 and GOES 13 gives similar views of the developing tropical system off the coast of Yucatan in part because the satellites are only separated by 15 degrees of longitude GOES 13 sits on the Equator at 75 degrees West Longitude GOES 15 imager data differs from GOES 11 Whereas GOES 11 has a 12 0 micrometer channel which is useful for observations of dust and ash when used in conjunction with the 10 7 micrometer channel GOES 15 has a 13 3 micron channel which data are useful for cloud top properties GOES 15 GOES 13 Imager Water Vapor loop The GOES 15 Imager water vapor channel has 4 km resolution versus 8 km resolution on GOES 11 In the loop above note the better depiction of gradients despite the vastly different view angles and the better depiction of the mid level vortex at the southwest edge of the image Another comparison of 8

    Original URL path: http://cimss.ssec.wisc.edu/goes/blog/archives/date/2011/07 (2012-11-14)
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  • June « 2011 « CIMSS Satellite Blog
    time above showed a large area exhibiting LST values of 125 130ºF darker red color enhancement at that time although shelter air temperatures 5 feet above the surface were only in the 102ºF to 104ºF range GOES 13 3 9 µm shortwave IR images below click image to play animation showed how after sunset the areas with drier air lower dew points tended to cool off faster than adjacent areas with more moisture in the air higher dew points GOES 13 3 9 µm shortwave IR images METAR surface reports click image to play animation Farther to the west a large wildfire was burning near Los Alamos National Laboratory in New Mexico A sequence of daytime GOES 13 0 63 µm visible channel images followed by night time GOES 13 3 9 µm shortwave IR images below click image to play animation revealed a very large smoke plume spreading northeastward during the day on 26 June along with a very large fire hot spot black to yellow pixels on the shortwave IR images The large smoke plume was still apparent on the first few visible images on the next morning 27 June GOES 13 0 63 µm visible images GOES 13 3 9 µm shortwave IR images click image to play animation A comparison of 1 km resolution POES AVHRR 0 63 µm visible channel and 3 74 µm shortwave IR channel images below showed a better view of the fire hot spot and associated smoke plume at 01 32 UTC POES AVHRR 0 63 µm visible channel and 3 74 µm shortwave IR channel images Posted in AVHRR Fire detection General interpretation GOES 13 MODIS POES No Comments Flooding along the Souris River and Missouri River in North Dakota June 23rd 2011 MODIS 0 65 µm visible channel and 2 1 µm near IR snow ice channel images AWIPS images of 1 km resolution MODIS 0 65 µm visible channel and MODIS 2 1 µm near IR snow ice channel data on 23 June 2011 above demonstrated the utility of the snow ice channel to help highlight areas of potential flooding because water is a strong absorber at the 2 1 µm wavelength it appears very dark in the snow ice images The Souris River located in north central North Dakota stands out in the images along with the Missouri River to the southwest A comparison of 250 meter resolution MODIS true color and false color images below showed greater detail of the flooded areas on the false color image as well as the fact that a great deal of sediment was flowing into the Missouri River and even into the western portion of Lake Sakakawea MODIS true color and false color Red Green Blue RGB images A comparison between MODIS false color images on 29 June 2010 and 23 June 2011 below showed the dramatic change in the Souris River as well as in the Missouri River southwest of Williston North Dakota In June 2011 historic flooding was

    Original URL path: http://cimss.ssec.wisc.edu/goes/blog/archives/date/2011/06 (2012-11-14)
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  • May « 2011 « CIMSS Satellite Blog
    with this large thunderstorm as it developed in extreme southeastern Kansas and moved eastward ahead of an advancing cold frontal boundary According to the National Weather Service Springfield MO damage survey the Joplin tornado produced EF 5 damage with a path width of 3 4 mile and a path length of 6 miles and was responsible for 132 deaths and 750 injuries A 250 meter resolution MODIS true color Red Green Blue RGB image from the SSEC MODIS Today site below displayed using Google Earth showed the line of thunderstorms developing from western Missouri into extreme southeastern Kansas MODIS true color Red Green Blue RGB image displayed using Google Earth AWIPS images of GOES 13 10 7 µm IR channel data with overlays of the Automated Overshooting Tops Detection product below flagged a number of overshooting tops as the storm approached Joplin KJLN GOES 13 10 7 µm IR images CIMSS Automated Overshooting Top Detection product A comparison of AWIPS images of the GOES 13 10 7 µm IR channel data at 21 25 UTC with overlays of the corresponding Automated Thermal Couplet Detection product and the past hour of SPC storm reports below revealed a strong thermal couplet of 12 7º C at that time about 1 hour and 16 minutes before the Joplin tornado note that the location of the thermal couplet indicator is parallax corrected moving it just to the southeast of where the cold warm thermal couplet is seen on the non parallax corrected GOES 13 IR image This particular thermal couplet was associated with a west to east swath of hail as large as 1 75 inch in diameter that began in far southeastern Kansas at 21 02 UTC along with a report of wind gusts to 62 mph The Joplin tornado began to move into the city around 22 41 UTC 5 41 pm local time GOES 13 IR image Thermal Couplet product SPC storm reports The Overshooting Tops detection and Thermal Couplet detection products are collaborative efforts between researchers at the NASA Langley Research Center and CIMSS The development generation and evaluation of these products are part of the GOES R Proving Ground effort these products will be operational with data from the ABI instrument on GOES R Posted in GOES 13 GOES R MODIS Severe convection 1 Comment Eruption of the Grímsvötn volcano in Iceland May 21st 2011 Meteosat 9 visible channel images Meteosat 9 visible channel images above showed the volcanic eruption cloud emanating from the Grímsvötn volcano in Iceland on 21 May 2011 images courtesy of Dave Santek SSEC According to the Icelandic Met Office at 21 00 UTC the eruption plume had risen to an altitude of over 65 000 ft 20 km It is interesting to note that the London VAAC reported EXTREME LIGHTNING ACTIVITY DETECTED BY ATDNET SYSTEM OF UK METOFFICE 7000 BETWEEN 1900Z AND 0100Z The volcanic eruption cloud was even apparent on the very edge of GOES 13 GOES East imagery as can be seen

    Original URL path: http://cimss.ssec.wisc.edu/goes/blog/archives/date/2011/05 (2012-11-14)
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  • April « 2011 « CIMSS Satellite Blog
    the day The GOES 13 satellite had been placed into Rapid Scan Operations RSO supplying imagery as frequently as every 5 10 minutes Zoomed in versions of GOES 13 RSO 0 63 µm visible images covering the period of the long track 80 mile EF 4 Tuscaloosa KTCL Birmingham KBHM tornado are available here which show that the storms exhibited a number of distinct overshooting tops during the time period between 20 40 UTC and 23 25 UTC AWIPS images of 4 km resolution GOES 13 10 7 µm IR channel data with overlays of severe weather reports below click image to play animation showed the first round of large storms with cold cloud top IR brightness temperatures red to black to white color enhancement that moved through the area during the pre dawn hours which produced mainly damaging wind reports followed by the development later in the afternoon and early evening hours of the stronger storms that produced numerous reports of large hail and strong tornadoes ahead of an advancing cold front SPC storm reports Zoomed in versions of GOES 13 RSO 10 7 µm IR images covering the period of the long track 80 mile EF 4 Tuscaloosa KTCL Birmingham KBHM tornado are available here cloud top IR brightness temperature values during the 20 40 UTC to 23 25 UTC time period were as cold as 75º C at 22 25 UTC GOES 13 10 7 µm IR images click image to play animation With the higher 1 km spatial resolution of the POES AVHRR IR imagery below more detail could be seen in the cloud top IR brightness temperature structure and much colder cloud top temperatures could be detected in the vicinity of the strongest overshooting tops as cold as 83º C violet color enhancement Other similar 1 km resolution POES AVHRR IR and MODIS IR image examples with overlays of storm reports are available at 16 28 UTC 18 10 UTC 18 12 UTC 18 35 UTC 19 48 UTC 19 52 UTC 20 13 UTC 00 01 UTC and 03 34 UTC POES AVHRR 12 0 µm IR image SPC storm reports Although there was widespread cloudiness across much of the Southeast US hourly GOES 13 Sounder Convective Available Potential Energy CAPE derived product images below were still able to provide some indication as to the instability of the air mass that was feeding northward into the region that morning GOES 13 Sounder CAPE derived product imagery Another important ingredient was the approach of a strong trough aloft along with an associated strong mid level jet streak as seen in a comparison of 1 km resolution MODIS 6 7 µm water vapor imagery and CRAS model 500 millibar hPa wind speeds below MODIS 6 7 µm water vapor channel image CRAS model 500 MB wind speeds CIMSS participation in GOES R Proving Ground activities includes making a variety of POES AVHRR MODIS and additional GOES Sounder images and products available for National Weather Service offices

    Original URL path: http://cimss.ssec.wisc.edu/goes/blog/archives/date/2011/04 (2012-11-14)
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