Alert archive / South Dakota / Heat Advisories in 2018
Heat Advisory 7, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this heat advisory at Jul 10, 2018, 2:39 PM CDT for 24 counties in South Dakota; 11 counties in Iowa; 8 counties in Minnesota. It took effect at Jul 11, 2018, 12:00 PM CDT. It was in force for 32 hr.
The area
The counties it named.
The facts
- Issued
- Jul 10, 2018, 2:39 PM CDT (19:39 UTC)
- In effect from
- Jul 11, 2018, 12:00 PM CDT
- Expired
- Jul 12, 2018, 8:00 PM CDT
- In force
- 32 hr
- Issued by
- NWS Sioux Falls, SD
All 43 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, Cottonwood County, MN, Jackson County, MN, Lincoln County, MN, Lyon County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Rock County, MN, Aurora County, SD, Beadle County, SD, Bon Homme County, SD, Brookings 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, Kingsbury County, SD, Lake County, SD, Lincoln County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Sanborn County, SD, Turner County, SD, Union County, SD, Yankton County, SD
The radar
The Sioux Falls radar (KFSD), 12 km from the middle of the area, began a volume at 19:39 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
Omaha, NE (KOAX), launched 12:00Z, 7.7 hours before the alert went out and 247 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.
- Mixed-layer CAPE
- 59 J/kg
- Mixed-layer CIN
- -283 J/kg
- Mixed-layer LCL
- 1766 m above ground
- 0-6 km bulk shear
- 7 kt
- 0-1 km storm-relative helicity
- 19 m²/s²
- 0-3 km storm-relative helicity
- -2 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 10, 11:58 AM CDT, 2 hours 41 minutes earlier.
Area forecast discussion, Jul 10, 11:58 AM CDT, 2 hours 41 minutes before
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</html>Hazardous weather outlook, Jul 10, 3:49 AM CDT, 10 hours 50 minutes before
Hazardous Weather Outlook National Weather Service Sioux Falls SD 349 AM CDT Tue Jul 10 2018 IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097- 098-NEZ013-014-SDZ040-056-062-067-070-071-110900- Lyon IA-Osceola-Dickinson-Sioux-O'Brien-Clay IA-Plymouth-Cherokee- Buena Vista-Woodbury-Ida-Lincoln MN-Lyon MN-Murray-Cottonwood- Nobles-Jackson-Pipestone-Rock-Dixon-Dakota-Brookings-Moody- Minnehaha-Lincoln SD-Clay SD-Union- 349 AM CDT Tue Jul 10 2018 This Hazardous Weather Outlook is for portions of northwest Iowa, west central Iowa, southwest Minnesota, northeast Nebraska, east central South Dakota, and southeast South Dakota. .DAY ONE...Today and Tonight Flooding continues on several rivers. For specific river details, visit https://water.weather.gov. Afternoon heat index values will climb into the mid 90s. .DAYS TWO THROUGH SEVEN...Wednesday through Monday Heat index values will climb into the mid 90s on Wednesday afternoon. Thunderstorms will be possible on Wednesday evening. A few of the storms may become severe. The better chances will be north of Interstate 90. Thunderstorms will again be possible Thursday night. Isolated severe storms will be possible along with a threat for heavy rainfall. The better chances should be along and south of Interstate 90. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed tonight. SDZ038-039-050-052>055-057>061-063>066-068-069-110900- Beadle-Kingsbury-Gregory-Jerauld-Sanborn-Miner-Lake-Brule-Aurora- Davison-Hanson-McCook-Charles Mix-Douglas-Hutchinson-Turner- Bon Homme-Yankton- 349 AM CDT Tue Jul 10 2018 This Hazardous Weather Outlook is for portions of central South Dakota, east central South Dakota, south central South Dakota, and southeast South Dakota. .DAY ONE...Today and Tonight Afternoon heat index values will climb into the mid and upper 90s. .DAYS TWO THROUGH SEVEN...Wednesday through Monday Heat index values will climb to 95 to 100 on Wednesday afternoon. Thunderstorms will be possible on Wednesday evening. A few of the storms may become severe. The better chances will be north of Interstate 90. Thunderstorms will again be possible Thursday night. Isolated severe storms will be possible along with a threat for heavy rainfall. The better chances should be along and south of Interstate 90. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed tonight.
In the hours before
Local storm report, Jul 10, 11:17 AM CDT, 3 hours 22 minutes before
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</html>Local storm report, Jul 10, 11:19 AM CDT, 3 hours 20 minutes before
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</html>Local storm report, Jul 10, 12:32 PM CDT, 2 hours 7 minutes before
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</html>Local storm report, Jul 10, 12:38 PM CDT, 2 hours 1 minute before
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</html>The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 10, 11:01 AM CDT | Severe Thunderstorm Warning | FSD | Clay, Dickinson | 29 min |
| Jul 10, 7:43 AM CDT | Severe Thunderstorm Warning | FSD | Lincoln, Lyon | 47 min |
Nearby
Heat Advisories in South Dakota, 2018Heat Advisories in Iowa, 2018Heat Advisories in Minnesota, 2018Every heat advisory in 2018
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.