11 July 2000 | Severe Convection Across South Dakota

GOES-11 visible - Click to enlarge

GOES-11 visible image

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GOES-11 10.7 IR - Click to enlarge

GOES-11 10.7 IR image

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(- Fade between GOES-11 22:15 UTC visible and IR image -)

The recently-launched NOAA GOES-11 satellite is being evaluated during a 2-part Science Test during July and August 2000. The GOES-11 imager and sounder products shown here are from an outbreak of severe convection across eastern South Dakota on 11 July, which produced several tornadoes, large hail (up to 4 inches in diameter), and damaging winds (60-70 mph gusts). In addition, Aberdeen, SD set a daily precipitation record, receiving 1.95 inches of rainfall (in a 2-hour period). GOES-11 visible (above left) and 10.7 micrometer InfraRed (above, right) show the development of the convection along and ahead of a cold front that was moving southeastward across the region. Preliminary locations of severe weather at 22:15 UTC (+/- 5 minutes) are plotted on the static images above (TORN=tornado; A100=hail of 1.00 inch in diameter; G70=wind gust of 70 knots). Visible and IR features of interest are discussed on their respective Java animation pages (severe report locations will be added to the animation images soon...).

GOES-11 Sounder PW - Click to enlarge

GOES-11 Sounder PW

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GOES-11 water vapor image - Click to enlarge

GOES-11 water vapor image

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GOES-11 sounder Precipitable Water (above, left) shows that ample moisture (PW values greater than 40 mm [1.5 inches], red enhancement) was in place across eastern South Dakota during the afternoon hours. A moisture gradient associated with the developing warm frontal boundary in south-central South Dakota is also evident.

GOES-11 imager 6.7 micrometer IR, or "water vapor" imagery (above, right) shows warming/drying moving eastward across the region, associated with the advance of an upper-level jet streak (40 m s-1 at 250 mb). Upper level divergence ahead of the advancing jet streak indicated large-scale upward vertical motion across the region, which was favorable for convective development. Additional GOES-8 water vapor winds products for this event are available.

For additional information on the GOES-11 Science Test, including real-time GOES-11 Sounder products and animations, see the CIMSS GOES-11 Science Test page. Real-time GOES-11 imager products are available from the CIRA RAMSDIS Online site.

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