Heavy rain event in southeastern South Dakota

August 28th, 2015 |

GOES-13 Infrared (10.7 um) images [click to play animation]

GOES-13 Infrared (10.7 um) images [click to play animation]

A line of training thunderstorms produced heavy rainfall in parts of southeastern South Dakota on the evening of 27 August 2015, with the highest rainfall amount being 7.52 inches just southwest of Sioux Falls (Public Information Statement). 4-km resolution GOES-13 (GOES-East) 10.7 µm Infrared images (above; click to play animation) showed the development and motion of the storms that moved through the Sioux Falls (KFSD) area. The coldest cloud-top IR brightness temperature was -68º C (darker black color enhancement) just to the northwest of Sioux Falls on the 0115 UTC (8:15 PM local time) image. However, because of parallax resulting from the large satellite viewing angle, the actual location of that tall, cold cloud top would have been just to the southeast of Sioux Falls (the yellow + symbol on this image).

A comparison of 1-km resolution POES AVHRR Visible (0.86 µm) and Infrared (12.0 µm) images at 2330 UTC or 6:30 PM local time (below) showed the developing convective storms in greater detail. The coldest cloud-top IR brightness temperature was -73º C with the westernmost cluster of thunderstorms.

POES AVHRR Visible (0.86 m) and Infrared (12.0 um) images [click to enlarge]

POES AVHRR Visible (0.86 m) and Infrared (12.0 um) images [click to enlarge]

A closer view of the GOES-13 Infrared images with METAR surface reports is shown below. Note that Sioux Falls had a peak wind gust of 32 knots (37 mph).

GOES-13 Infrared (10.7 um) images with METAR surface reports [click to play animation]

GOES-13 Infrared (10.7 um) images with METAR surface reports [click to play animation]

The Blended Total Precipitable Water (TPW) Percent of Normal product (below; click to play animation) showed TPW values as high as 199% of normal just to the north-northeast of Sioux Falls at 0442 UTC (11:42 PM local time).

Blended Total Precipitable Water Percent of Normal [click to play animation]

Blended Total Precipitable Water Percent of Normal [click to play animation]


 

 

 

 

 

 


 

 

 

 

 

 

 

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