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  • 20 August 1999 -- Tropical Storm Bret Over the Gulf of Mexico
    show the dissipation and redevelopment of the Central Dense Overcast CDO over the storm center as it developed off the coast of Mexico GOES 8 water vapor winds below indicated that the tropical cyclone was in an environment of strong divergence and weak shear within the upper troposphere which was favorable for Bret to continue the trend of intensification At 15 00 UTC on 20 August maximum sustained winds were

    Original URL path: http://cimss.ssec.wisc.edu/goes/misc/990820.html (2012-11-14)
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  • 20 August 1999 | Moist Plume Over Illinois
    showed that the dry air PW less than 20 mm blue enhancement remained in place over these cloud free areas during the entire day GOES 8 imager visible 17 45 UTC Java animation GOES 8 sounder PW 17 46 UTC Java animation With a low level ridge of high pressure in place over Iowa and Wisconsin the flow within the boundary layer over Illinois was northeasterly during this period so

    Original URL path: http://cimss.ssec.wisc.edu/goes/misc/990820_pw.html (2012-11-14)
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  • 11 August 1999 -- Salt Lake City Tornado
    of injuries Hail up to 1 5 inches in diameter was also reported from this storm NOAA GOES 10 visible and InfraRed IR imagery above show the development of convection across the region during the late morning and early afternoon hours Coldest IR cloud tops in the vicinity of Salt Lake City were around 45 to 50 C green to yellow enhancement which was close to the tropopause temperature as indicated on the 12 00 UTC Salt Lake City rawinsonde report GOES 10 6 7 micrometer IR water vapor imagery below left shows that the axis of an upper tropospheric shortwave trough was approaching northwestern Utah with a jet streak moving northward over eastern Utah GOES 8 water vapor winds depicted an upper tropospheric vorticity maximum over northern Utah to the northwest of the cyclonically curved upper level jet streak The strong dynamics assocated with this upper level trough may have played a role in the development of the severe convection that moved through the Salt Lake City area GOES 10 Sounder derived Lifted Index LI at 13 00 UTC below right reveals that the air mass across northern Utah was already becoming unstable during the morning hours Sounder derived

    Original URL path: http://cimss.ssec.wisc.edu/goes/misc/990811.html (2012-11-14)
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  • 05 August 1999 -- Fires in the Western Central Unites States
    identified many fire complexes in Nevada Oregon and Idaho GOES 10 3 75 and 3 98 micron sounder data also provided observations of some of the larger fires The Java animations of GOES 10 imager and sounder imagery shown above depict the diurnal variability in the fire signatures The following time series compare the sounder 3 75 and 3 98 micron fire brightness temperatures and 3 75 minus 3 98

    Original URL path: http://cimss.ssec.wisc.edu/goes/misc/99217_fire.html (2012-11-14)
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  • 27 July 1999 -- Lifted Index Shows Instability Over The Great Plains
    Lifted Index image from 19 UTC July 27 1999 The 06 hr Eta forecast from the 12 UTC run also captured the region of large instability over the central Dakotas The Eta forecast of the parcel LI is over plotted on the sounder Lifted Index from 18 UTC July 27 1999 The 12 hr Eta forecast from the 12 UTC run also captured the region of large instability over Minnesota The Eta forecast of the parcel LI is over plotted on the sounder Lifted Index from 00 UTC July 28 1999 Total Precipitable Water Vapor Derived From The GOES 8 And GOES 10 Sounders Combined GOES 8 10 Coverage FLI 2740910 bytes Animation FLI Player Information GIF Images for 28 Jul 99 6 00 32UTC 5 00 32UTC 4 00 32UTC 3 00 32UTC 2 00 32UTC 1 00 32UTC 0 00 32UTC GIF Images for 27 Jul 99 23 00 32UTC 22 00 32UTC 21 00 32UTC 20 00 32UTC 19 00 32UTC 18 00 32UTC 17 00 32UTC 16 00 32UTC 15 00 32UTC 14 00 32UTC 13 00 32UTC 12 00 32UTC 11 00 32UTC 10 00 32UTC 9 00 32UTC 8 00 32UTC 7 00 32UTC 6 00 32UTC Entire conterminous US FLI 3718218 bytes Animation FLI Player Information GIF Images for 28 Jul 99 6 00 32UTC 5 00 32UTC 4 00 32UTC 3 00 32UTC 2 00 32UTC 1 00 32UTC 0 00 32UTC GIF Images for 27 Jul 99 23 00 32UTC 22 00 32UTC 21 00 32UTC 20 00 32UTC 19 00 32UTC 18 00 32UTC 17 00 32UTC 16 00 32UTC 15 00 32UTC 14 00 32UTC 13 00 32UTC 12 00 32UTC 11 00 32UTC 10 00 32UTC 9 00 32UTC 8 00 32UTC 7 00 32UTC 6 00 32UTC

    Original URL path: http://cimss.ssec.wisc.edu/goes/misc/990727.html (2012-11-14)
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  • 06 July 1999 -- Mesoscale Vorticity Center Over the Carolinas
    July on 05 06 July this circulation moved southward and then westward across the Atlantic Ocean around the periphery of a large ridge of high pressure that was responsible for an early July heat wave across much of the eastern U S NOAA GOES 8 6 7 micrometer InfraRed water vapor imagery above shows the development and motion of the convective system across the northeastern U S followed by the westward propagation of the MVC circulation as it turned back toward the southeast U S coast Numerical models handled this feature poorly note the placement of 500 hPa vorticily centers on the Eta model analyses as the MVC moved westward toward the Carolinas Closer views using the GOES 8 imager 6 7 micrometer IR and GOES 8 Sounder 7 5 micrometer IR below show sustained cyclonic circulation over the Atlantic with the Sounder imagery indicating more of a closed nature to the circulation GOES 8 water vapor wind upper level divergence increased across the Carolina coast region as the MVC began to move inland indicating synoptic scale upward vertical motion favorable for convective development across that area GOES 8 Imager water vapor Java animation GOES 8 Sounder water vapor Java animation GOES 8 visible 05 July Java animation GOES 8 visible 06 July Java animation The cyclonic circulation of clouds within the MVC was also evident on GOES 8 visible imagery as it moved across the Atlantic on 05 July above left During this time the feature was moving over the Gulf Stream where higher sea surface temperatures of 26 28 C may have helped to provide a flux of water vapor and sensible heat into the system As the feature approached the coast the mid level energy interacted with the very moist and unstable air mass that was in

    Original URL path: http://cimss.ssec.wisc.edu/goes/misc/990706.html (2012-11-14)
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  • 02 June 1999 -- Crash of American Airlines Flight 1420 at Little Rock AR
    while making a landing at Little Rock National Airport Adams Field at 04 50 UTC on 02 June 1999 11 50 PM CDT 01 June 1999 GOES 8 10 7 micrometer InfraRed IR imagery showed an intense cluster of convection moving southeastward across Arkansas during that time Cloud top temperatures were as cold as 60 to 70 C red to black enhancement within this convective system indicating that some tops

    Original URL path: http://cimss.ssec.wisc.edu/goes/misc/990602.html (2012-11-14)
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  • 03 May 1999 -- Oklahoma Tornado Outbreak
    IR imagery A loop of 6 7 micrometer IR water vapor imagery shows the approach of an upper level shortwave trough during the afternoon hours strong upper level divergence indicated that synoptic scale upward vertical velocities were being enhanced as a jet streak moved across Oklahoma GOES 8 Sounder lifted index LI and total precipitable water PW derived products are shown below During the morning hours preceeding convective development a trend of rapid destabilization was evident from central Texas into Oklahoma LI s dropped to 8 C and lower red enhancement the moisture gradient appeared to increase slightly along the dry line across western Oklahoma GOES 8 Sounder LI Java animation GOES 8 Sounder PW Java animation GOES 8 Sounder data is combined with AERI retrieval data to produce skew t log p thermodynamic diagrams from Purcell in southcentral Oklahoma at 20 and 21 UTC just prior to the convective development below Note how the low level capping inversion near 850 hPa is eroded from 20 to 21 UTC allowing organized updrafts to penetrate above the level of free convection In that 1 hour period the CAPE increased from 4111 to 4681 J kg 1 and the lifted index LI

    Original URL path: http://cimss.ssec.wisc.edu/goes/misc/990503.html (2012-11-14)
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