Alert archive / South Dakota / Heat Advisories in 2020

Heat Advisory 3, NWS Sioux Falls, SD

July 17, 202010 counties in South Dakota; Lincoln County, Minnesota

NWS Sioux Falls, SD issued this heat advisory at Jul 17, 2020, 2:36 PM CDT for 10 counties in South Dakota; Lincoln County, Minnesota. It took effect at Jul 18, 2020, 1:00 PM CDT. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: Jul 17, 2020, 2:36 PM CDT (19:36 UTC)
In effect from: Jul 18, 2020, 1:00 PM CDT
Expired: Jul 18, 2020, 3:36 PM CDT
In force: 3 hr
Issued by: NWS Sioux Falls, SD

Counties Lincoln County, MN, Brookings County, SD, Charles Mix County, SD, Davison County, SD, Douglas County, SD, Hanson County, SD, Lake County, SD, McCook County, SD, Miner County, SD, Moody County, SD, Sanborn County, SD

The radar

The Sioux Falls radar (KFSD), 71 km from the middle of the area, began a volume at 19:38 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

Minneapolis, MN (KMPX), launched 12:00Z, 7.6 hours before the alert went out and 331 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: 1028 J/kg
Mixed-layer CIN: -75 J/kg
Mixed-layer LCL: 924 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 145 m²/s²
0-3 km storm-relative helicity: 190 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Jul 17, 12:01 PM CDT, 2 hours 35 minutes earlier.

Area forecast discussion, Jul 17, 12:01 PM CDT, 2 hours 35 minutes before

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Hazardous weather outlook, Jul 17, 5:29 AM CDT, 9 hours 7 minutes before

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In the hours before

Local storm report, Jul 17, 8:42 AM CDT, 5 hours 54 minutes before

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Local storm report, Jul 17, 8:44 AM CDT, 5 hours 52 minutes before

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Local storm report, Jul 17, 8:58 AM CDT, 5 hours 38 minutes before

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Local storm report, Jul 17, 9:31 AM CDT, 5 hours 5 minutes before

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Local storm report, Jul 17, 9:57 AM CDT, 4 hours 39 minutes before

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Local storm report, Jul 17, 10:48 AM CDT, 3 hours 48 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
Jul 17, 4:05 AM CDT	Excessive Heat Watch	FSD	Bon Homme, Clay, Hanson, Hutchinson, Lincoln, McCook and 4 more	11 hr
Jul 17, 8:01 AM CDT	Severe Thunderstorm Warning	FSD	Bon Homme	29 min
Jul 17, 8:26 AM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Yankton	49 min
Jul 17, 8:59 AM CDT	Severe Thunderstorm Warning	FSD	Hanson, Hutchinson, McCook	46 min
Jul 17, 2:36 PM CDT	Excessive Heat Warning	FSD	Bon Homme, Clay, Hutchinson, Lincoln, Minnehaha, Turner and 2 more	29 hr

Nearby

Heat Advisories in South Dakota, 2020 Heat Advisories in Minnesota, 2020 Every heat advisory in 2020

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.