Alert archive / South Dakota / Heat Advisories in 2010

Heat Advisory 2, NWS Sioux Falls, SD

August 7, 201020 counties in South Dakota; 11 counties in Iowa; Rock County, Minnesota

NWS Sioux Falls, SD issued this heat advisory at Aug 7, 2010, 3:43 PM CDT for 20 counties in South Dakota; 11 counties in Iowa; Rock County, Minnesota. It took effect at Aug 8, 2010, 1:00 PM CDT. It was in force for 26 hr.

The area

The counties it named.

The facts

Issued: Aug 7, 2010, 3:43 PM CDT (20:43 UTC)
In effect from: Aug 8, 2010, 1:00 PM CDT
Expired: Aug 9, 2010, 3:26 PM CDT
In force: 26 hr
Issued by: NWS Sioux Falls, SD

All 32 counties

Buena Vista County, IA, Cherokee County, IA, Clay County, IA, Dickinson County, IA, Ida County, IA, Lyon County, IA, O'Brien County, IA, Osceola County, IA, Plymouth County, IA, Sioux County, IA, Woodbury County, IA, Rock County, MN, Aurora County, SD, Beadle County, SD, Bon Homme County, SD, Brule County, SD, Charles Mix County, SD, Clay County, SD, Davison County, SD, Douglas County, SD, Gregory County, SD, Hanson County, SD, Hutchinson County, SD, Jerauld County, SD, Lincoln County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Sanborn County, SD, Turner County, SD, Union County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 40 km from the middle of the area, began a volume at 20:49 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 8.7 hours before the alert went out and 206 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1979 J/kg
Mixed-layer CIN: -159 J/kg
Mixed-layer LCL: 799 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 139 m²/s²
0-3 km storm-relative helicity: 162 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this heat advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Sioux Falls, SD wrote its last area forecast discussion before this heat advisory went out at Aug 7, 3:31 PM CDT, 12 minutes earlier.

Area forecast discussion, Aug 7, 3:31 PM CDT, 12 minutes before

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Hazardous weather outlook, Aug 7, 11:15 AM CDT, 4 hours 28 minutes before

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In the hours before

Local storm report, Aug 7, 9:47 AM CDT, 5 hours 56 minutes before

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The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 7, 3:43 PM CDT	Excessive Heat Warning	FSD	Bon Homme, Clay, Union, Yankton	27 hr
Aug 7, 2:44 AM CDT	Flash Flood Warning	FSD	Buena Vista, Clay	3 hr
Aug 7, 3:11 AM CDT	Flash Flood Warning	FSD	O'Brien, Osceola	3 hr
Aug 7, 5:25 AM CDT	Flash Flood Warning	FSD	Buena Vista, Clay	3 hr
Aug 7, 6:50 AM CDT	River Flood Warning	FSD	Buena Vista, Clay	8 hr

Nearby

Heat Advisories in South Dakota, 2010 Heat Advisories in Iowa, 2010 Heat Advisories in Minnesota, 2010 Every heat advisory in 2010

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.