Alert archive / Iowa / Heat Advisories in 2018
Heat Advisory 5, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this heat advisory at Jul 4, 2018, 4:16 AM CDT for 7 counties in South Dakota; 11 counties in Iowa; 4 counties in Minnesota. It took effect at Jul 4, 2018, 1:00 PM CDT. It was in force for 7 hr.
The area
The counties it named.
The facts
- Issued
- Jul 4, 2018, 4:16 AM CDT (09:16 UTC)
- In effect from
- Jul 4, 2018, 1:00 PM CDT
- Expired
- Jul 4, 2018, 8:00 PM CDT
- In force
- 7 hr
- Issued by
- NWS Sioux Falls, SD
All 22 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, Nobles County, MN, Rock County, MN, Bon Homme County, SD, Clay County, SD, Lincoln County, SD, Minnehaha County, SD, Turner County, SD, Union County, SD, Yankton County, SD
The radar
The Sioux Falls radar (KFSD), 69 km from the middle of the area, began a volume at 09:19 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 00:00Z, 9.3 hours before the alert went out and 267 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
- 3627 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 889 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 55 m²/s²
- 0-3 km storm-relative helicity
- 14 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 4.1
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 4, 4:13 AM CDT, 3 minutes earlier.
Area forecast discussion, Jul 4, 4:13 AM CDT, 3 minutes before
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</html>Hazardous weather outlook, Jul 3, 7:42 PM CDT, 8 hours 34 minutes before
Hazardous Weather Outlook National Weather Service Sioux Falls SD 742 PM CDT Tue Jul 3 2018 SDZ038>040-050-052>061-063>066-068-069-050045- Beadle-Kingsbury-Brookings-Gregory-Jerauld-Sanborn-Miner-Lake- Moody-Brule-Aurora-Davison-Hanson-McCook-Charles Mix-Douglas- Hutchinson-Turner-Bon Homme-Yankton- 742 PM CDT Tue Jul 3 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...Tonight There is a chance of thunderstorms generally north of I-90 tonight. Initially, a few storms could be strong to severe with the threat gradually transitioning to a locally heavy rain threat as the evening/overnight progresses. .DAYS TWO THROUGH SEVEN...Wednesday through Monday Heat indices between 90 and 100 degrees are expected for 4th of July afternoon. The chance of storms will increase during the late afternoon and evening on Wednesday, with a few strong to severe storms, as well as locally heavy rain possible. .SPOTTER INFORMATION STATEMENT... Spotter activation is not likely tonight. IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097- 098-NEZ013-014-SDZ062-067-070-071-050045- 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-Minnehaha-Lincoln SD- Clay SD-Union- 742 PM CDT Tue Jul 3 2018 This Hazardous Weather Outlook is for portions of northwest Iowa, west central Iowa, southwest Minnesota, northeast Nebraska, and southeast South Dakota. .DAY ONE...Tonight There is a small possibility of thunderstorms generally north of I-90 tonight. If they do develop, a few storms could be strong to severe with the threat gradually transitioning to a locally heavy rain threat as the evening/overnight progresses. Moderate to major flooding continues on several rivers and streams. For specific river details, visit https://water.weather.gov. .DAYS TWO THROUGH SEVEN...Wednesday through Monday Heat indices around 100 degrees are again expected for 4th of July afternoon. The chance of storms will increase during the late afternoon and evening on Wednesday, with a few strong to severe storms, as well as locally heavy rain possible. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed through tonight.
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 4, 9:37 AM CDT | River Flood Warning | FSD | Lincoln | 24 hr |
| Jul 4, 10:22 AM CDT | Severe Thunderstorm Warning | FSD | Dickinson, Osceola | 23 min |
| Jul 4, 10:36 AM CDT | Severe Thunderstorm Warning | FSD | Dickinson, Osceola | 39 min |
| Jul 4, 11:07 AM CDT | Severe Thunderstorm Warning | FSD | Clay, Dickinson | 38 min |
| Jul 4, 5:35 PM CDT | Severe Thunderstorm Warning | FSD | Cherokee, O'Brien, Plymouth, Sioux | 40 min |
| Jul 4, 6:17 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Cherokee, Clay, O'Brien | 28 min |
| Jul 4, 6:46 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Clay | 29 min |
| Jul 4, 9:37 AM CDT | River Flood Warning | FSD | Rock | 44 hr |
Nearby
Heat Advisories in Iowa, 2018Heat Advisories in South Dakota, 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.