Alert archive / Iowa / Heat Advisories in 2021
Heat Advisory 3, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this heat advisory at Jun 17, 2021, 3:00 AM CDT for 4 counties in Iowa; Dakota County, Nebraska. It took effect at Jun 17, 2021, 1:00 PM CDT. It was in force for 6 hr.
The area
The counties it named.
The facts
- Issued
- Jun 17, 2021, 3:00 AM CDT (08:00 UTC)
- In effect from
- Jun 17, 2021, 1:00 PM CDT
- Expired
- Jun 17, 2021, 7:22 PM CDT
- In force
- 6 hr
- Issued by
- NWS Sioux Falls, SD
Counties Buena Vista County, IA, Cherokee County, IA, Ida County, IA, Woodbury County, IA, Dakota County, NE
The radar
The Sioux Falls radar (KFSD), 141 km from the middle of the area, began a volume at 08:04 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 00:00Z, 8.0 hours before the alert went out and 143 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
- 2997 J/kg
- Mixed-layer CIN
- -144 J/kg
- Mixed-layer LCL
- 1946 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 120 m²/s²
- 0-3 km storm-relative helicity
- 435 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 27.9
The text
As transmitted.
361 WWUS73 KFSD 170800 NPWFSD URGENT - WEATHER MESSAGE National Weather Service Sioux Falls SD 300 AM CDT Thu Jun 17 2021 IAZ021-022-031-032-NEZ014-171600- /O.NEW.KFSD.HT.Y.0003.210617T1800Z-210618T0100Z/ Cherokee-Buena Vista-Woodbury-Ida-Dakota- 300 AM CDT Thu Jun 17 2021 ...HEAT ADVISORY IN EFFECT FROM 1 PM THIS AFTERNOON TO 8 PM CDT THIS EVENING... * WHAT...Heat index values up to 106 expected. * WHERE...In Nebraska, Dakota County. In Iowa, Cherokee, Buena Vista, Woodbury and Ida Counties. * WHEN...From 1 PM this afternoon to 8 PM CDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ For more information from the National Weather Service visit https://weather.gov/siouxfalls
2 follow-up statements
690 WWUS73 KFSD 171955 NPWFSD URGENT - WEATHER MESSAGE National Weather Service Sioux Falls SD 255 PM CDT Thu Jun 17 2021 IAZ021-022-031-032-NEZ014-180100- /O.CON.KFSD.HT.Y.0003.000000T0000Z-210618T0100Z/ Cherokee-Buena Vista-Woodbury-Ida-Dakota- 255 PM CDT Thu Jun 17 2021 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM CDT THIS EVENING... * WHAT...Heat index values up to 106 expected. * WHERE...In Nebraska, Dakota County. In Iowa, Cherokee, Buena Vista, Woodbury and Ida Counties. * WHEN...From 1 PM this afternoon to 8 PM CDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ For more information from the National Weather Service visit https://weather.gov/siouxfalls
625 WWUS73 KFSD 180022 NPWFSD URGENT - WEATHER MESSAGE National Weather Service Sioux Falls SD 722 PM CDT Thu Jun 17 2021 IAZ021-022-031-032-NEZ014-180130- /O.CAN.KFSD.HT.Y.0003.000000T0000Z-210618T0100Z/ Cherokee-Buena Vista-Woodbury-Ida-Dakota- 722 PM CDT Thu Jun 17 2021 ...HEAT ADVISORY IS CANCELLED... Heat indices have dropped below the advisory threshold, thus allowing for the advisory to be cancelled early. Temperatures will continue to slowly fall through the evening hours. $$ For more information from the National Weather Service visit https://weather.gov/siouxfalls
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 16, 8:38 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Cherokee, Clay, O'Brien | 37 min |
| Jun 16, 9:00 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Cherokee, Ida | 45 min |
| Jun 16, 9:47 PM CDT | Severe Thunderstorm Warning | FSD | Ida | 28 min |
| Jun 16, 10:04 PM CDT | Severe Thunderstorm Warning | FSD | Ida | 9 min |
Nearby
Heat Advisories in Iowa, 2021Heat Advisories in Nebraska, 2021Every heat advisory in 2021
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.