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  • July « 2010 « CIMSS Satellite Blog
    Storm Reports these storms produced hail as large as 4 0 inches in diameter and produced a tornado that was responsible for EF 3 damage and 2 fatalities This was only the 4th EF3 damage producing tornado on record in Montana and the deadliest tornado in that state since 1923 The GOES 15 satellite positioned at 89 5º West longitude had the most direct view of the storm and an animation of 0 63 µm visible channel images below showing some interesting cloud top structure including several overshooting tops as well as a well defined anvil plume later in the animation sequence GOES 15 0 63 µm visible images The GOES 11 GOES West satellite positioned at 135º West longitude offered a more oblique view of the severe thunderstorms below Viewing the storms from such a high western angle one can see the appearance of low level inflow feeder band clouds as the thunderstorms were intensifying In addition since GOES 11 was in Rapid Scan Operations RSO mode more images were available compared to the normal 15 minute scan interval used with GOES 15 above GOES 11 0 65 µm visible images Posted in GOES 11 GOES 13 GOES 15 Severe convection No Comments Large hail damage swath acrosss northwestern South Dakota July 25th 2010 GOES 13 10 7 µm IR images Several days before the largest hailstone on record in the US fell in central South Dakota McIDAS images of 4 km resolution GOES 13 10 7 µm IR data above showed a cluster of severe thunderstorms that propagated southeastward across far northwestern South Dakota on 19 July 2010 From a satellite perspective this convection did not appear to be unusually intense in terms of cold IR cloud top brightness temperatures only as cold as 63º C darker red color enhancement or any enhanced V or other typical severe storm top signatures but it nonetheless produced a long duration wind and hail event that resulted in a remarkably long and wide damage path This wind driven hail damage path can be seen on the comparison of three 250 meter resolution MODIS true color Red Green Blue RGB images created using bands 4 3 1 from 15 July 4 days before the event 20 July one day after the event and 25 July 6 days after the event acquired from the SSEC MODIS Today site The hail damage swath appears as the distinct broad tan colored feature that is oriented from northwest to southeast According to the SPC Storm Reports the largest hail size was 2 50 inches in diameter and the maximum wind gust was 70 mph in that particular region However a number of the storm reports mentioned a wind driven hail duration of 15 30 minutes which exacerbated the crop damage One storm report mentioned 1150 acres of corn stripped MODIS true color RGB images from 15 July 20 July and 25 July 2010 According to Matt Bunkers SOO at the NWS forecast office at Rapid City

    Original URL path: http://cimss.ssec.wisc.edu/goes/blog/archives/date/2010/07 (2012-11-14)
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  • June « 2010 « CIMSS Satellite Blog
    of Campeche June 28th 2010 Tropical Storm Alex which formed over the northwestern Caribbean Sea out of a westward moving tropical wave on Friday and Saturday emerged overnight into the Bay of Campeche from the Yucatan Peninsula Since emerging from that landmass as a tropical depression signifying sustained winds weaker than 35 knots it has strengthened back to Tropical Storm status Current forecasts place it as a hurricane possibly major near the northern Mexico Gulf Coast later this week The large scale environment is favorable for strengthening For example the MIMIC Total Precipitable Water loop here shows an environment that is rich in moisture over the Gulf of Mexico Note also the apparent Fujiwara interaction between Alex and Pacific Tropical Depression Darby as they start to circulate around a common center The general west northwestward drift of the feature is also readily apparent as are the tropical systems Celia and Darby in the Pacific Ocean The projected path of the storm takes it over warm sea surface temperatures with abundant Oceanic Heat Content In addition the environment is one of low shear that is decreasing with time Images of these products are available at the CIMSS Tropical Cyclone Web page 10 8 micron imagery from the AVHRR on NOAA 15 on the morning of 28 June above shows Brightness temperatures around 80 C in the strong convection around the center of Alex MODIS 11 0 µm IR image Update MODIS 11 0 µm IR imagery above revealed cloud top IR brightness temperatures as cold as 92º C darkest purple color enhancement associated with some of the intense convection around Alex at 18 53 UTC These areas of very cold cloud top were identified as overshooting tops overshooting the tropopause by the IR Water vapor difference product reference Tropical Cyclone Convection and Intensity Analysis Using Differenced Infrared and Water Vapor Imagery Olander and Velden 2009 from the CIMSS Tropical Cyclones site below GOES 13 Overshooting Top IR Water vapor difference product Posted in AVHRR General interpretation GOES 13 MODIS Tropical cyclones No Comments Category 5 Hurricane Celia June 25th 2010 GOES 11 IR images Hurricane Celia became the first Category 5 tropical cyclone of the 2010 East Pacific season on 24 June in fact the 140 knot intensity of Celia tied with Hurricane Ava 1973 as the strongest East Pacific Basin hurricane on record during the month of June GOES 11 IR images from the CIMSS Tropical Cyclones site above displayed an annular structure with a well defined small diameter eye as the hurricane began to slowly weaken on 25 June 2010 85 GHz microwave imagery from the SSM I instrument below also revealed the nearly symmetric structure of the eye of the Celia SSMI S 85 GHz microwave imagery Terra MODIS 11 0 µm IR image McIDAS images of Terra MODIS 11 0 µm IR channel data above showed the well defined eye of Celia during the pre dawn hours on 25 June while GOES 11 0 65 µm visible

    Original URL path: http://cimss.ssec.wisc.edu/goes/blog/archives/date/2010/06 (2012-11-14)
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  • May « 2010 « CIMSS Satellite Blog
    on a Red Green Blue RGB false color image using NOAA 15 AVHRR channels 01 02 04 below In this particular RGB image combination low clouds have more of a yellow tint while colder higher topped clouds appear brighter white NOAA 15 AVHRR false color RGB image using channels 01 02 04 An AWIPS image of the MODIS Sea Surface Temperature SST product below showed that the initial convective outflow boundary likely moved over an area of cooler offshore waters SST values generally in the middle 40s to lower 50s F blue to cyan colors with a stronger marine boundary layer inversion over the colder waters the gravity wave undular bore feature might have been able to become more well defined as it was ducted toward the southwest MODIS Sea Surface Temperature SST product Posted in AVHRR GOES 13 MODIS POES Red Green Blue RGB images No Comments Great Lakes advection fog features May 25th 2010 POES AVHRR Sea Surface Temperatre SST product During 24 May 25 May 2010 a northward flux of unseasonably warm daily high temperatures in the 80s and 90s F and humid dew points in the middle 60s to low 70s F air moved northward across the Great Lakes region However an AWIPS image of the POES AVHRR Sea Surface Temperature SST product above showed that SST values were still in the upper 30s to low 40s F over much of Lake Superior and the upper 40s to low 50s F over much of Lake Michigan The cold water temperatures caused the surface air to cool to saturation with widespread advection fog developing over a great deal of Lake Superior and Lake Michigan A 250 meter resolution MODIS Red Green Blue RGB image created using Bands 1 4 3 below revealed an interesting pattern of shock waves in the lake fog as the southeasterly flow was interacting with the coastline of parts of eastern Wisconsin MODIS true color RGB image created using Bands 1 4 3 During the subsequent overnight hours a comparison of the 4 km resolution GOES 13 fog stratus product with the corresponding 1 km resolution MODIS fog stratus product below demonstrated how the improvement in spatial resolution was an aid to more accurately locating the exact boundaries of the fog over western Lake Superior and the inland areas in the vicinity of Duluth Minnesota station identifier KDLH 4km resolution GOES 13 fog stratus product 1 km resolution MODIS fog stratus product With arrival of daylight on the morning of 25 May an animation of GOES 13 0 63 µm visible channel images below showed how the lake fog features were affecting various inland portions of northeastern Minnesota at different times GOES 13 0 63 µm visible channel images Posted in AVHRR Fog detection GOES 13 Marine weather MODIS POES Red Green Blue RGB images 2 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

    Original URL path: http://cimss.ssec.wisc.edu/goes/blog/archives/date/2010/05 (2012-11-14)
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  • April « 2010 « CIMSS Satellite Blog
    first official GOES 15 full disk InfraRed IR images became available at 17 30 UTC on 26 April 2010 The GOES 15 Imager 10 7 µm longwave IR image is shown above similar images are available for the 0 65 µm visible channel the 3 9 µm shortwave IR the 6 5 µm water vapor channel and the 13 3 µm CO2 channel GOES 15 was launched on 04 March 2010 with the first visible images from the Imager instrument available on 06 April and from the first visible images from the Sounder instrument on 08 April GOES 15 will have a Post Launch Test beginning in August 2010 GOES 15 multi panel display of the Imager visible and IR channels A multi panel display showing all 5 of the GOES 15 Imager channels is shown above For comparison purposes a similar multi panel display of all five of the GOES 13 Imager channels is shown below GOES 13 multi panel display of the Imager visible and IR channels GOES 13 and GOES 15 10 7 µm longwave IR images Some close up comparisons of GOES 13 and GOES 15 IR images show similar results from the two satellites The image above uses GOES 13 and GOES 15 10 7 µm longwave IR channel data to display a cluster of strong convection over the far eastern Gulf of Mexico between Florida and Cuba the coldest 10 7 µm IR brightness temperatures seen were 196 2 K 77 0º C on GOES 13 vs 194 9 K 78 3º C on GOES 15 The image below is a comparison of the 13 3 µm CO2 channels Note that the Field of View FOV of the 13 3 µm CO2 channel has improved from 8 km on GOES 13 to 4 km on GOES 15 as a result the edges of cloud features now appear much smoother on the GOES 15 13 3 µm image GOES 13 and GOES 15 13 3 µm CO2 channel images Looking farther to the west the image below shows the Gulf of Mexico Loop Current using the 3 9 µm shortwave IR channel data from GOES 13 and GOES 15 AWIPS images of the Sea Surface Temperature SST products from MODIS and AVHRR indicated that the SST values were as warm as 80º F within the Loop Current surrounded by waters with SST values in the 70 75º F range GOES 13 and GOES 15 3 9 µm shortwave IR images GOES 13 and GOES 15 6 5 µm water vapor images A comparison of the GOES 13 and GOES 15 6 5 µm water vapor channels above showed a pocket of very dry air yellow to orange color enhancement to the north of the aforementioned strong convection located between Florida and Cuba This dry air was a signature of a well defined jet stream break as verified by GFS model 250 hPa wind speed isotachs below GOES 13 water vapor image GFS 250 hPa wind

    Original URL path: http://cimss.ssec.wisc.edu/goes/blog/archives/date/2010/04 (2012-11-14)
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  • March « 2010 « CIMSS Satellite Blog
    CLAVR x POES AVHRR Cloud Type product below indicated a number of Overshooting Top category clouds violet color enhancement associated with the stronger convective clusters POES AVHRR Cloud Type product The POES AVHRR Cloud Top Height product below showed that the highest cloud tops over the Bahamas were around 15 km or 49 000 feet cyan color enhancement POES AVHRR Cloud Top Height product A MODIS Sea Surface Temperature SST product from the following day below revealed that there was a very strong SST gradient between Florida where SST values were primarily in the mid 60s F green colors and the Bahamas where SST values were in the mid 70s F orange colors Perhaps the significantly warmer SST values of the Gulf Stream may have also played a role in the intensification of the convection as it approached the Bahamas MODIS Sea Surface Temperature product Posted in AVHRR GOES 12 Lightning MODIS POES Severe convection No Comments Blowing dust in New Mexico and Texas March 26th 2010 GOES 12 visible images McIDAS images of the GOES 12 0 65 µm visible channel data above showed the development of a large plume of blowing dust across parts of southern New Mexico and western Texas late in the day on 26 March 2010 Surface winds gusted to 84 mph at El Paso in Texas with the blowing dust temporarily reducing the surface visibility to 0 1 mile A 250 meter resolution Aqua MODIS true color Red Green Blue RGB image from the SSEC MODIS Today site below revealed that at the time of the Aqua satellite overpass 20 24 UTC plumes of blowing sand were already beginning to stream northeastward from the White Sands National Monument and Missile Range in southern New Mexico the blowing sand had already reached the partially snow covered Sacramento Mountains located to the east of Alamogordo At that time the surface visibility at Alamogordo was 5 miles but within 3 hours the visibility there dropped to 0 5 mile Aqua MODIS true color image viewed using Google Earth With the approach of darkness the GOES 12 GOES East visible channel imagery could no longer be utilized to track the location and movement of the thick airborne dust however the older GOES 11 GOES West satellite imager instrument still retains a 12 0 µm channel that is helpful for creating a simple 10 7 12 0 µm channel 04 channel 05 IR temperature difference product that is useful for tracking airborne dust and also volcanic ash at night Such a sequence of GOES 11 10 7 12 0 µm images below showed that the dust plume yellow to cyan color enhancement continued to move eastward and northeastward across Texas and into southwestern Oklahoma during the hours after sunset GOES 11 10 7 12 0 µm IR temperature difference images A few hours later a similar MODIS IR difference product created by subtracting the brightness temperatures of the 11 0 µm and 12 0 µm channels below showed that

    Original URL path: http://cimss.ssec.wisc.edu/goes/blog/archives/date/2010/03 (2012-11-14)
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  • February « 2010 « CIMSS Satellite Blog
    INR is immediately obvious with significantly less image to image wobble compared to GOES 12 this enables the ice motion to be tracked more accurately Note GOES 13 is scheduled to replace GOES 12 as the operational GOES East satellite on 14 April 2010 A closer view using 250 meter resolution Terra and Aqua MODIS true color images from the SSEC MODIS Today site below viewed using Google Earth revealed that there was still some land fast ice along the far southern shore of Lake Erie but most of the ice field was indeed moving eastward during the 103 minutes separating the times of the Terra satellite overpass 16 34 UTC and the Aqua satellite overpass 18 17 UTC Terra and Aqua MODIS true color images viewed using Google Earth An AWIPS image of the MODIS Sea Surface Temperature SST product below indicated that the water temperatures in the ice free portions of Lake Erie were in the 32 33º F range violet color enhancement MODIS Sea Surface Temperature product Posted in GOES 12 GOES 13 Google Earth Marine weather MODIS Red Green Blue RGB images Winter weather No Comments Nice satellite views of the Vancouver British Columbia region February 18th 2010 GOES 13 visible images With an elongated ridge of high pressure in place along the British Columbia coast on 18 February 2010 nearly cloud free conditions allowed for some nice satellite views of the Vancouver British Columbia area the site of the 2010 Winter Olympics McIDAS images of GOES 13 visible channel data above showed the widespread snow covered mountains that occupied much of the region as well as the evolution of some of the cloud features during the day Early in the animation some small patches of fog and stratus clouds could be seen burning off as they slowly drifted southward over the waters of the Strait of Georgia The locations of Vancouver station identifier CYVR and Whistler station identifier CWAE are indicated on the visible imagery This animation also serves to highlight the improved Image Navigation and Registration INR of the GOES 13 satellite there is much less image to image wobble compared to the previous generation of GOES satellites NOTE GOES 13 is scheduled to replace GOES 12 as the operational GOES East satellite on 14 April 2010 On the NOAA 19 false color Red Green Blue RGB image below using channels 01 0 62 µm 02 0 86 µm and 03 3 7 µm bare ground appears as shades of green to brown snow cover is brighter white and stratus clouds over the mountains farther to the east appear as shades of yellow NOAA 19 false color Red Green Blue RGB image A comparison of 250 meter resolution MODIS true color and false color images from the SSEC MODIS Today site below shows even greater detail of the snow covered terrain features of the region as well as the few patches of fog stratus cloud that remained over the northern portion of the Strait

    Original URL path: http://cimss.ssec.wisc.edu/goes/blog/archives/date/2010/02 (2012-11-14)
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  • January « 2010 « CIMSS Satellite Blog
    snow cover and ice appear as darker red features on the MODIS false color RGB image This example offers a glimpse at the type of RGB image capability that should be available with the upcoming AWIPS II software A closer view using 250 meter resolution true color images from the SSEC MODIS Today site below revealed that the northwesterly surface winds were causing a small amount of motion of the ice field between the time of the Terra satellite overpass 17 11 UTC or 11 11 am local time and the Aqua satellite overpass 18 54 UTC or 12 54 pm local time MODIS true color images A comparison of the 18 54 UTC Aqua MODIS true color and false color images below again confirms that the features seen over the nearshore waters were indeed lake ice snow cover and ice appear as cyan colored features on this particular false color imagery MODIS true color and false color images Posted in MODIS Red Green Blue RGB images Winter weather Comments Off Welcome back GOES 13 January 27th 2010 GOES 12 and GOES 13 sounder channel data The GOES 13 satellite was brought out of on orbit storage on 27 January 2010 and a comparison of the 19 channels of the sounder instrument on GOES 12 and GOES 13 above shows an improvement in the noise characteristics that were beginning to plague the GOES 12 sounder in late 2009 GOES 12 imager channel data The imager instruments on GOES 12 above and GOES 13 below share the same 5 channels 1 visible and 4 InfraRed However the GOES 13 satellite has improved Image Navigation and Registration INR which eliminates a great deal of the image to image wobble that is often seen with GOES 12 In addition larger batteries aboard the spacecraft allow GOES 13 to continue to operate through the Spring and Fall season eclipse periods when the satellite is in the Earth s shadow and the solar panels cannot generate the power needed to operate the various instrument packages GOES 13 imager channel data GOES 13 launched in May 2006 with a Post Launch Test conducted in December 2006 will replace GOES 12 launched in July 2001 as the operational GOES East satellite on 14 April 2010 At that point GOES 12 will then be moved to a new position at 60º West Longitude to support South American operations More information on the transition of GOES 13 into operations is available from the NOAA NESDIS Satellite Services Division Posted in GOES sounder GOES 12 GOES 13 Comments Off 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 January 2010 M T W T F S S Dec Feb 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

    Original URL path: http://cimss.ssec.wisc.edu/goes/blog/archives/date/2010/01 (2012-11-14)
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  • December « 2009 « CIMSS Satellite Blog
    the dynamic tropopause taken to be the PV1 5 potential vorticity surface was being pulled downward to around the 450 hPa pressure level The GOES Sounder Total Column Ozone product also showed a slight increase in ozone values to around 350 Dobson Units associated with the stronger trailing stratospheric intrusion vortex NAM80 vertical cross section Posted in Aviation GOES sounder GOES 14 Comments Off The Christmas Blizzard of 2009 December 26th 2009 GOES 12 10 7 µm IR images with overlay of surface weather type An intense blizzard affected much of the central US on 24 December 25 December 2009 significantly disrupting travel and commerce from North Dakota to Texas Oklahoma City OK received 14 1 inches of snow which was both their greatest 24 hour snowfall and their greatest storm total snowfall on record McIDAS images of the GOES 12 10 7 µm IR channel data above also available as a QuickTime animation showed the evolution of a well defined Trough of Warm Air Aloft TROWAL signature across Oklahoma and Texas with moderate to heavy snow falling just to the north and west of the pivot point of the southern eastern edge of the colder 30º to 50º C dark blue to violet color enhancement cloud top temperatures Surface winds gusted as high as 64 mph in Oklahoma creating white out conditions with blowing and drifting snow On the morning of 25 December a comparison of AWIPS images of the MODIS visible channel and a false color Red Green Blue RGB composite below showed the areal extent of significant snow remaining on the ground snow cover on the RGB image was highlighted with a red color enhancement in contrast to supercooled water droplet clouds which appeared as brighter white features This also offers a glimpse at the type of RGB image capability that should be available with the upcoming AWIPS 2 software For higher resolution MODIS true color and false color images from 25 December see the SSEC MODIS Today site MODIS visible image and false color Red Green Blue RGB image GOES 12 6 5 µm water vapor images below also available as a QuickTime animation displayed the impressively large size of the circulation associated with the storm as it intensified from 25 December to 26 December In the north central US entire Interstate highway systems were shut down for an extended period across the Dakotas snowfall amounts were as high as 40 0 inches at Lead South Dakota with amounts over 24 inches in North Dakota and Minnesota Significant accruals of ice up to 0 4 inch from freezing rain occurred in parts of Iowa Illinois and Indiana Winds gusted as high as 76 mph in western South Dakota HPC storm summary GOES 12 6 5 µm water vapor images Posted in GOES 12 MODIS Red Green Blue RGB images Winter weather Comments Off Older Entries Webmaster Follow us on Search for Pages About this site CIMSS Satellite Proving Ground Contact us Mobile users POES AVHRR in

    Original URL path: http://cimss.ssec.wisc.edu/goes/blog/archives/date/2009/12 (2012-11-14)
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