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  • November « 2007 « CIMSS Satellite Blog
    and even over extreme northern Wisconsin and northern Lake Michigan the IR window channel brightness temperatures along many of the LES bands were colder than 20ºC light blue enhancement suggesting that cloud particle glaciation may have begun however the LES bands exhibited a generally bright appearance on the near IR Snow Ice channel leading one to suspect that the bands might still composed primarily of supercooled water droplets finally the Cloud Phase product indicated that the majority of the LES cloud features were likely of the Mixed Phase category darker gray enhancement so although LES band glaciation may not have been complete many of the bands probably contained a good amount of ice crystals which would be necessary for snow to fall at the surface Finally let s take a closer look at the MODIS true color imagery over the surrounding region some very interesting features are evident once we zoom in and take advantage of the 250 meter resolution of MODIS data using the SSEC MODIS Today website A close up view over northern Minnesota below reveals a long narrow gravity wave feature along the leading edge of a thin cloud deck also note that ice formation in Upper Red Lake just northeast of the cloud edge and gravity wave structure is well underway not surprising given that the air temperatures in that area were below 0º F 18º C Farther to the southeast a close up view centered over central Wisconsin below shows the mesoscale banded nature of the snow on the ground over that area especially along the southern periphery of the snow cover The snow depth in these streaks was probably only about 1 inch or less judging from the cooperative observer snow depth reports that were only a Trace across that particular region but the snow streaks really stood out against the surrounding areas of bare ground Such mesoscale snow steaks are not uncommon to see on satellite imagery following light snowfall events these satellite signatures help to underscore the difficulty in forecasting snowfall accumulation amounts over any given location Posted in GOES 12 MODIS Satellite winds Winter weather Comments Off Wave structure on top of a stratus cloud deck November 20th 2007 GOES 12 visible channel images above revealed an interesting wave structure along the top of an extensive stratus cloud deck that covered much of Iowa southern Wisconsin and northern Illinois on 20 November 2007 An AWIPS 4 panel image showing the MODIS and GOES 12 visible and IR window channels below demonstrated the better wave detection capabilities of the higher spatial resolution MODIS data The GOES 12 and MODIS IR brightness temperatures in the region of the wave signatures were generally in the 1ºC to 5ºC range with the GOES Sounder Cloud Top Height indicating tops around 4700 feet in that area tan enhancement the MODIS Cloud Phase product confirmed that the cloud in that region was likely composed of supercooled water droplets blue enhancement Much of the wave structure on satellite

    Original URL path: http://cimss.ssec.wisc.edu/goes/blog/archives/date/2007/11 (2012-11-14)
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  • October « 2007 « CIMSS Satellite Blog
    in Fire detection MODIS No Comments 4 day composite of the southern California fires October 24th 2007 The Wildfire Automated Biomass Burning Algorithm WFABBA team produced a 4 day composite of the southern California fires covering the period 21 24 October 2007 By 26 October nearly 500 000 acres 780 square miles were burned and over 1600 homes were destroyed The WFABBA product provides frequent low latency detections and characterizations of fires such as these as well as the ability to build composites to show the overall development of the fires Southern California fire activity can be monitored using WFABBA from either GOES 11 or GOES 12 Posted in Fire detection 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 October 2007 M T W T F S S Sep Nov 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 MODIS MTSAT Other Satellites POES Red Green Blue RGB images Satellite winds Severe convection Suomi NPP Synthetic satellite imagery Training Tropical cyclones VIIRS Volcanic activity Web Map Server What the heck is this Winter weather Other blogs of interest AccuWeather Blogs CIMSS GOES Gallery CIMSS TPARC Support CIRA GOES R Proving Ground Blog EUMETSAT Image Gallery Geographic Information Network of

    Original URL path: http://cimss.ssec.wisc.edu/goes/blog/archives/date/2007/10 (2012-11-14)
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  • September « 2007 « CIMSS Satellite Blog
    red enhancement the surrounding land areas exhibited significantly cooler IR brightness temperatures around 8ºC yellow enhancement in agreement with most of the 11 UTC surface temperatures at METAR sites The cyan colored features in the northwestern and northcentral portions of the image were patches of stratus cloud which exhibited cloud top IR brightness temperatures around 3ºC The corresponding GOES 12 10 7µm IR image below showed similar warm signatures for a few of the larger inland lakes but only as warm as 10 to 12ºC however many of the smaller lakes could not be resolved by the 4 km resolution GOES 12 IR data Also note the patch of cold cirrus cloud over far southeastern Wisconsin dark blue to violet enhancement a transverse banding structure was evident with this cirrus feature on the AVHRR IR image a signature of potential high altitude turbulence which was not as apparent on the GOES 12 IR image About 25 minutes after the time of the IR images above an interesting orinthological meteorological radar signature of bird roost rings was observed Large numbers of birds dispersed from their nocturnal roost sites during the early morning hours to begin feeding and as the flock crossed the radar beam ring like signatures were seen on the Milwaukee Sullivan radar composite reflectivity product below QuickTime animation as the birds spread out across the area Similar radar signatures are also occasionally seen with bat swarms At least two of the roost rings appear to have originated from the general vicinity of some of the larger warmer lakes noted on the MODIS and GOES IR imagery above Beaver Dam Lake located northeast of Madison KMSN and Lake Koshkonong located southeast of Madison As close as one of the larger roost rings came to Dane County Regional Airport in Madison one also has to wonder if the high density of birds may have potentially been an aviation hazard for a brief period of time Posted in AVHRR Aviation General interpretation GOES 12 POES No Comments Mountain waves on water vapor imagery September 24th 2007 Strong winds in the middle troposphere 50 70 knots at 500 hPa were seen around the base of a large trough of low pressure that was centered over the Great Basin region of the western US above on 24 September 2007 A sequence of three AWIPS images of the MODIS 6 7µm water vapor channel from that day below revealed widespread areas of mountain wave signatures indicating that the strong winds were interacting with the rugged terrain across the southern and central Rocky Mountains These types of mountain waves are known to be a satellite signature of lee turbulence the pilot reports of turbulence were only isolated around the times of the 3 MODIS images 05 13 09 22 and 20 30 UTC but it could be that no aircraft were flying in the exact areas or altitudes where the lee wave signatures and any associated turbulence might have been present The corresponding sequence of three

    Original URL path: http://cimss.ssec.wisc.edu/goes/blog/archives/date/2007/09 (2012-11-14)
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  • August « 2007 « CIMSS Satellite Blog
    14 UTC on 26 August Since the GOES sounder has 3 separate water vapor channels 6 5 µm 7 0 µm and 7 4 µm the TPW can be partitioned into 3 vertical layers High Layer PW Mid Layer PW and Low Layer PW components below on this particular day the bulk of the TPW across southern California appeared to be in the middle layer which is generally between 700 and 900 hPa 1 3 km or 3000 10 000 feet Posted in GOES sounder Heavy rain flooding Tropical cyclones No Comments River flooding in southwestern Wisconsin August 25th 2007 Portions of the Upper Mississippi River Valley region received very heavy rainfall during the last half of August 2007 10 20 inches 250 500 mm of rain was observed in a 30 day period across parts of southeastern Minnesota and southwestern Wisconsin and 30 day precipitation departures there were as much as 300 400 above normal A MODIS true color image using the CIMSS SSEC MODIS True Color Imagery Viewer AWIPS application centered over southwestern Wisconsin on 12 August above shows the Mississippi River flowing north to south and the Wisconsin River flowing east to west several days before the onset of the heavy rain period Note the appearance of the Mississippi River flood plains the brighter green areas located just downstream of Lock and Dam Number 8 near Genoa WI and Lock and Dam Number 9 near Harpers Ferry IA Google map Two weeks later a corresponding MODIS true color image from 25 August below reveals that much of the Mississippi River flood plains had become flooded by water rich with sediment lighter brown colors The Wisconsin River also appears notably wider on the 25 August MODIS image and one of its major tributaries the Kickapoo River flowing north to south is very evident due to an abundance of sediment laden water Use this Java applet to interactively fade or toggle between the 12 August and 25 August MODIS true color images A new record 24 hour precipitation amount for the state of Minnesota was set when 15 10 inches 384 mm of rain fell on 18 19 August one mile south of Hokah which is located near the upper left corner of these MODIS images Google map In addition some locations set new records for the highest total precipitation for any calendar month including 15 18 inches 386 mm at Madison WI and 13 75 inches 349 mm at La Crosse WI Posted in Heavy rain flooding Hydrology MODIS 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 2007 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

    Original URL path: http://cimss.ssec.wisc.edu/goes/blog/archives/date/2007/08 (2012-11-14)
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  • July « 2007 « CIMSS Satellite Blog
    50 UTC below left was able to give a more precise indication of the areas where fog was beginning to form while the corresponding 4 km resolution GOES 12 fog stratus product at 08 01 UTC below right could only provide a vague signal that fog was starting to develop over portions of the region The fog continued to increase in depth and areal coverage later that night with surface visibility eventually dropping to 0 15 miles at Wisconsin sites Lone Rock KLNR and Boscobel KOVS 0 01 inch of precipitation was also recorded at each location as mist developed and as the fog thickened the GOES 12 fog stratus product did begin to exhibit a better signal of the fog structure especially over the lower Wisconsin River valley Java animation A comparison of the AWIPS GOES 12 fog stratus product and GOES 12 visible channel image at 13 15 UTC below shows that much of the river valley fog was still present after sunrise however note that after sunrise the fog features on the GOES 12 fog stratus product began to change in appearance from yellow or orange enhanced features 11 3 9µm brightness temperature difference values around 7º to 8º C to darker gray enhanced features 11 3 9µm brightness temperature difference values of around 4º to 5º C this is due to the fact that the 3 9µm channel is very sensitive to solar radiation reflected off the tops of water droplet cloud features such as fog which increases the brightness temperature value sensed by the 3 9µm detectors and therefore decreases the 11 3 9µm brightness temperature difference that constitutes the fog stratus product Because of the solar reflection issue the fog stratus product is not valid during daytime hours Posted in Fog detection GOES 12 MODIS No Comments MCV over the central Plains July 25th 2007 An mesoscale phenomenon that sometimes emerges out of Mesoscale Convective Systems MCS is the Mesoscale Convective Vortex MCV Intense latent heating within the rain core of an MCS can help spin up a vortex that will occasionally live on even as the MCS that spawned it withers away The spin up can be visualized as a potential vorticity response to latent heating in mid levels that increases static stability and therefore increases the potential vorticity inducing spin The spin development can also be viewed in terms of changes in height via the Quasi geostrophic height tendency equation latent heat above causes height falls below and the development of cyclonic spin Atmospheres that support the development of MCVs have things in common Abundant moisture and low stability are important It s also common to have low values of vertical wind shear that is the wind profile is fairly uniform The degree of uniformity together with the amount of moisture and instability help determine if the MCV will be sustained The key to persistence is ongoing warming through latent heat release at mid levels On 24 July a large MCS over

    Original URL path: http://cimss.ssec.wisc.edu/goes/blog/archives/date/2007/07 (2012-11-14)
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  • June « 2007 « CIMSS Satellite Blog
    around 22 31 UTC a false color image using AVHRR channels 1 2 and 3 shows a pair of convective towers that appear to be developing along a SW NE oriented boundary just southeast of Lake Manitoba below A closer view using the NOAA 15 AVHRR 10 8µm IR channel data below reveals cloud top temperature structures that resemble cold warm couplets associated with those two developing storms just southeast of Lake Manitoba however the other NOAA 15 AVHRR visible and IR channel images suggest that the cloud mass was probably thinner in those particular regions allowing warmer radiation from below to bleed upward through the cloud and be sensed as warmer IR pixels Posted in AVHRR GOES 11 GOES 12 POES Red Green Blue RGB images Severe convection No Comments Enhanced V and Warm Trench IR signatures June 19th 2007 Severe thunderstorms developed over northwestern Kansas on 19 June 2007 An AWIPS image of the MODIS 11 0µm InfraRed IR channel above revealed an enhanced v and a warm trench IR signature on adjacent storm tops The coldest cloud top brightness temperature values were 77º C on both signatures the warmest IR temperature associated with the enhanced v was 58º C while the warmest IR temperature in the warm trench was 61º C You can get a sense that such a trench can surround an overshooting top by examining astronaut photography of thunderstorms taken from the space shuttle image courtesy of Earth Sciences and Image Analysis Laboratory NASA Johnson Space Center A closer view of the MODIS IR image with a different color enhancement above shows that both IR signatures were surrounded by clusters of negative yellow and positive red cloud to ground CG lightning strikes SPC storm reports listed hail up to 1 75 inches in diameter within 1 hour of the MODIS image in the region of both IR signatures but only the southernmost enhanced v storm produced a tornado however higher radar reflectivity values 65 70 dBz were seen with the northernmost warm trench storm A comparison of the GOES 12 and MODIS IR images above demonstrates the better detection capability of these types of IR signatures using 1 km resolution MODIS IR imagery vs 4 km resolution GOES IR imagery The IR channels on the next generation GOES R Advanced Baseline Imager ABI will have a 2 km resolution GOES 12 10 7µm IR imagery above 100 image QuickTime animation showed that these severe thunderstorms in Kansas persisted into the nighttime hours and eventually became part of a very large Mesoscale Convective Complex MCC farther to the south over Oklahoma and Texas Note the large number of IR pixels exhibiting brightness temperatures of 80º C or colder violet enhancement after 02 02 UTC IR brightness temperatures were as cold as 93º C on a 23 22 UTC NOAA 12 AVHRR IR image and as cold as 84º C on 05 10 05 13 UTC GOES MODIS IR images with 4159 negative and 334 positive CG

    Original URL path: http://cimss.ssec.wisc.edu/goes/blog/archives/date/2007/06 (2012-11-14)
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  • May « 2007 « CIMSS Satellite Blog
    InfraRed IR images above Java animation showed an area of strong thunderstorms exhibiting cold brightness temperatures of 70 to 80º C black to white enhancement expanding eastward toward the islands of American Samoa in the South Pacific Ocean on 28 29 May 2007 The motion of these storms on satellite imagery prompted the issuance of a Flash Flood Warning for the islands of Tutuila Aunuu and Manua at 02 54 UTC on 29 May 3 54 PM on 28 May local time It is important to note that there is no radar in that particular region making satellite imagery the only forecasting tool for such hazards however GOES 11 Southern Hemisphere sector imagery below is only available over that region 2 3 times per hour Posted in GOES 11 Heavy rain flooding 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 May 2007 M T W T F S S Apr Jun 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 MODIS MTSAT Other Satellites POES Red Green Blue RGB images Satellite winds Severe convection Suomi NPP Synthetic satellite imagery Training Tropical cyclones VIIRS Volcanic activity Web Map Server What the heck is this Winter weather Other blogs of interest

    Original URL path: http://cimss.ssec.wisc.edu/goes/blog/archives/date/2007/05 (2012-11-14)
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  • April « 2007 « CIMSS Satellite Blog
    southward into extreme northern Charlton county The new fire that started just to the northwest in Atkinson county a day earlier was also exhibiting a pronounced hot spot and smoke plume Posted in Fire detection GOES 12 MODIS Red Green Blue RGB images No Comments Algae blooms off the California coast April 27th 2007 According to news reports algae blooms off the coast of California have been producing toxic levels of domoic acid that have recently killed large numbers of birds sea lions and dolphins MODIS true color images centered over San Francisco California above Java animation show the presence of chlorophyll containing phytoplankton light blue green color along the immediate coastal waters during the 23 March to 24 April 2007 period Posted in General interpretation Marine weather MODIS 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 April 2007 M T W T F S S Mar May 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 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 MODIS MTSAT Other Satellites POES Red Green Blue RGB images Satellite winds Severe convection Suomi NPP Synthetic satellite imagery Training Tropical cyclones VIIRS Volcanic activity Web Map Server What the heck is this Winter weather Other blogs of interest AccuWeather Blogs CIMSS GOES

    Original URL path: http://cimss.ssec.wisc.edu/goes/blog/archives/date/2007/04 (2012-11-14)
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