Alert archive / Iowa / Heat Advisories in 2017
Heat Advisory 3, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this heat advisory at Jul 18, 2017, 3:07 PM CDT for Ida County, Woodbury County, Iowa; Dakota County, Dixon County, Nebraska. It took effect at Jul 20, 2017, 1:00 PM CDT. It was in force for 7 hr.
The area
The counties it named.
The facts
- Issued
- Jul 18, 2017, 3:07 PM CDT (20:07 UTC)
- In effect from
- Jul 20, 2017, 1:00 PM CDT
- Expired
- Jul 20, 2017, 8:00 PM CDT
- In force
- 7 hr
- Issued by
- NWS Sioux Falls, SD
Counties Ida County, IA, Woodbury County, IA, Dakota County, NE, Dixon County, NE
The radar
The Omaha radar (KOAX), 122 km from the middle of the area, began a volume at 20:07 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, 8.1 hours before the alert went out and 122 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
- 367 J/kg
- Mixed-layer CIN
- -70 J/kg
- Mixed-layer LCL
- 1063 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 33 m²/s²
- 0-3 km storm-relative helicity
- -25 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
683 WWUS73 KFSD 182007 NPWFSD URGENT - WEATHER MESSAGE National Weather Service Sioux Falls SD 307 PM CDT Tue Jul 18 2017 IAZ031-032-NEZ013-014-190415- /O.NEW.KFSD.HT.Y.0002.170719T1800Z-170720T0100Z/ /O.NEW.KFSD.HT.Y.0003.170720T1800Z-170721T0100Z/ Woodbury-Ida-Dixon-Dakota- 307 PM CDT Tue Jul 18 2017 ...HEAT ADVISORY IN EFFECT FROM 1 PM TO 8 PM CDT WEDNESDAY... ...HEAT ADVISORY IN EFFECT FROM 1 PM TO 8 PM CDT THURSDAY... The National Weather Service in Sioux Falls has issued a Heat Advisory, which is in effect from 1 PM to 8 PM CDT Wednesday. A Heat Advisory has also been issued from 1 PM to 8 PM CDT Thursday. * TEMPERATURE...High temperatures will reach the mid 90s Wednesday and Thursday afternoon producing heat index values between 100 and 105 degrees. * IMPACTS...The combination of hot temperatures and high humidity will increase the potential for heat-related stress and illness. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Heat Advisory means that a period of hot temperatures is expected. The combination of hot temperatures and high humidity will combine to create a situation in which heat illnesses are possible. Drink plenty of fluids...stay in an air-conditioned room...stay out of the sun...and check up on relatives and neighbors. 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 light weight and loose fitting clothing when possible and drink plenty of water. 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. && $$ IAZ001-012-020-021-SDZ050-052-053-057>071-190415- /O.NEW.KFSD.HT.Y.0002.170719T1800Z-170720T0100Z/ Lyon IA-Sioux-Plymouth-Cherokee-Gregory-Jerauld-Sanborn-Brule- Aurora-Davison-Hanson-McCook-Minnehaha-Charles Mix-Douglas- Hutchinson-Turner-Lincoln SD-Bon Homme-Yankton-Clay SD-Union- 307 PM CDT Tue Jul 18 2017 ...HEAT ADVISORY IN EFFECT FROM 1 PM TO 8 PM CDT WEDNESDAY... The National Weather Service in Sioux Falls has issued a Heat Advisory, which is in effect from 1 PM to 8 PM CDT Wednesday. * TEMPERATURE...High temperatures will reach the mid 90s Wednesday afternoon producing heat index values between 100 and 105 degrees. * IMPACTS...The combination of hot temperatures and high humidity will increase the potential for heat-related stress and illness. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Heat Advisory means that a period of hot temperatures is expected. The combination of hot temperatures and high humidity will combine to create a situation in which heat illnesses are possible. Drink plenty of fluids...stay in an air-conditioned room...stay out of the sun...and check up on relatives and neighbors. Take extra precautions...if you work or spend time outside. When possible...reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear light weight and loose fitting clothing when possible and drink plenty of water. To reduce risk during outdoor work...the occupational safety and health administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency...call 9 1 1. && $$
6 follow-up statements
788 WWUS73 KFSD 190352 NPWFSD URGENT - WEATHER MESSAGE National Weather Service Sioux Falls SD 1052 PM CDT Tue Jul 18 2017 IAZ031-032-NEZ013-014-191200- /O.CON.KFSD.HT.Y.0002.170719T1800Z-170720T0100Z/ /O.CON.KFSD.HT.Y.0003.170720T1800Z-170721T0100Z/ Woodbury-Ida-Dixon-Dakota- 1052 PM CDT Tue Jul 18 2017 ...HEAT ADVISORY REMAINS IN EFFECT FROM 1 PM TO 8 PM CDT WEDNESDAY... ...HEAT ADVISORY REMAINS IN EFFECT FROM 1 PM TO 8 PM CDT THURSDAY... * TEMPERATURE...High temperatures will reach the mid 90s Wednesday and Thursday afternoon producing heat index values between 100 and 105 degrees. * IMPACTS...The combination of hot temperatures and high humidity will increase the potential for heat-related stress and illness. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Heat Advisory means that a period of hot temperatures is expected. The combination of hot temperatures and high humidity will combine to create a situation in which heat illnesses are possible. Drink plenty of fluids...stay in an air-conditioned room...stay out of the sun...and check up on relatives and neighbors. 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 light weight and loose fitting clothing when possible and drink plenty of water. 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. && $$ IAZ001-012-020-021-SDZ050-052-053-057>071-191200- /O.CON.KFSD.HT.Y.0002.170719T1800Z-170720T0100Z/ Lyon IA-Sioux-Plymouth-Cherokee-Gregory-Jerauld-Sanborn-Brule- Aurora-Davison-Hanson-McCook-Minnehaha-Charles Mix-Douglas- Hutchinson-Turner-Lincoln SD-Bon Homme-Yankton-Clay SD-Union- 1052 PM CDT Tue Jul 18 2017 ...HEAT ADVISORY REMAINS IN EFFECT FROM 1 PM TO 8 PM CDT WEDNESDAY... * TEMPERATURE...High temperatures will reach the mid 90s Wednesday afternoon producing heat index values between 100 and 105 degrees. * IMPACTS...The combination of hot temperatures and high humidity will increase the potential for heat-related stress and illness. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Heat Advisory means that a period of hot temperatures is expected. The combination of hot temperatures and high humidity will combine to create a situation in which heat illnesses are possible. Drink plenty of fluids...stay in an air-conditioned room...stay out of the sun...and check up on relatives and neighbors. Take extra precautions...if you work or spend time outside. When possible...reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear light weight and loose fitting clothing when possible and drink plenty of water. To reduce risk during outdoor work...the occupational safety and health administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency...call 9 1 1. && $$
831 WWUS73 KFSD 190844 NPWFSD URGENT - WEATHER MESSAGE National Weather Service Sioux Falls SD 344 AM CDT Wed Jul 19 2017 IAZ013-022-SDZ038-054-191645- /O.EXA.KFSD.HT.Y.0002.170719T1800Z-170720T0100Z/ O'Brien-Buena Vista-Beadle-Miner- 344 AM CDT Wed Jul 19 2017 ...HEAT ADVISORY IN EFFECT FROM 1 PM THIS AFTERNOON TO 8 PM CDT THIS EVENING... The National Weather Service in Sioux Falls has issued a Heat Advisory, which is in effect from 1 PM this afternoon to 8 PM CDT this evening. * TEMPERATURE...High temperatures will reach the mid 90s this afternoon producing heat index values between 100 and 105 degrees. * IMPACTS...The combination of hot temperatures and high humidity will increase the potential for heat-related stress and illness. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Heat Advisory means that a period of hot temperatures is expected. The combination of hot temperatures and high humidity will combine to create a situation in which heat illnesses are possible. Drink plenty of fluids...stay in an air-conditioned room...stay out of the sun...and check up on relatives and neighbors. 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 light weight and loose fitting clothing when possible and drink plenty of water. 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. && $$ IAZ031-032-NEZ013-014-191645- /O.CON.KFSD.HT.Y.0002.170719T1800Z-170720T0100Z/ /O.CON.KFSD.HT.Y.0003.170720T1800Z-170721T0100Z/ Woodbury-Ida-Dixon-Dakota- 344 AM CDT Wed Jul 19 2017 ...HEAT ADVISORY REMAINS IN EFFECT FROM 1 PM THIS AFTERNOON TO 8 PM CDT THIS EVENING... ...HEAT ADVISORY REMAINS IN EFFECT FROM 1 PM TO 8 PM CDT THURSDAY... * TEMPERATURE...High temperatures will reach the mid 90s Wednesday and Thursday afternoon producing heat index values around 105 degrees. * IMPACTS...The combination of hot temperatures and high humidity will increase the potential for heat-related stress and illness. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Heat Advisory means that a period of hot temperatures is expected. The combination of hot temperatures and high humidity will combine to create a situation in which heat illnesses are possible. Drink plenty of fluids...stay in an air-conditioned room...stay out of the sun...and check up on relatives and neighbors. Take extra precautions...if you work or spend time outside. When possible...reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear light weight and loose fitting clothing when possible and drink plenty of water. To reduce risk during outdoor work...the occupational safety and health administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency...call 9 1 1. && $$ IAZ001-012-020-021-SDZ050-052-053-057>071-191645- /O.CON.KFSD.HT.Y.0002.170719T1800Z-170720T0100Z/ Lyon IA-Sioux-Plymouth-Cherokee-Gregory-Jerauld-Sanborn-Brule- Aurora-Davison-Hanson-McCook-Minnehaha-Charles Mix-Douglas- Hutchinson-Turner-Lincoln SD-Bon Homme-Yankton-Clay SD-Union- 344 AM CDT Wed Jul 19 2017 ...HEAT ADVISORY REMAINS IN EFFECT FROM 1 PM THIS AFTERNOON TO 8 PM CDT THIS EVENING... * TEMPERATURE...High temperatures will reach the mid 90s Wednesday afternoon producing heat index values between 100 and 105 degrees. * IMPACTS...The combination of hot temperatures and high humidity will increase the potential for heat-related stress and illness. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Heat Advisory means that a period of hot temperatures is expected. The combination of hot temperatures and high humidity will combine to create a situation in which heat illnesses are possible. Drink plenty of fluids...stay in an air-conditioned room...stay out of the sun...and check up on relatives and neighbors. 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 light weight and loose fitting clothing when possible and drink plenty of water. 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. && $$
998 WWUS73 KFSD 192017 NPWFSD URGENT - WEATHER MESSAGE National Weather Service Sioux Falls SD 317 PM CDT Wed Jul 19 2017 SDZ038-053-054-061-062-192130- /O.CAN.KFSD.HT.Y.0002.000000T0000Z-170720T0100Z/ Beadle-Sanborn-Miner-McCook-Minnehaha- 317 PM CDT Wed Jul 19 2017 ...HEAT ADVISORY IS CANCELLED... The National Weather Service in Sioux Falls has cancelled the Heat Advisory. The heat index will be below 100 this afternoon. $$ IAZ031-032-NEZ013-014-200430- /O.CON.KFSD.HT.Y.0002.000000T0000Z-170720T0100Z/ /O.CON.KFSD.HT.Y.0003.170720T1800Z-170721T0100Z/ Woodbury-Ida-Dixon-Dakota- 317 PM CDT Wed Jul 19 2017 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM CDT THIS EVENING... ...HEAT ADVISORY REMAINS IN EFFECT FROM 1 PM TO 8 PM CDT THURSDAY... * TEMPERATURE...High temperatures will reach the mid 90s this afternoon and Thursday afternoon producing heat index values between 100 and 105 degrees. * IMPACTS...The combination of hot temperatures and high humidity will increase the potential for heat-related stress and illness. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Heat Advisory means that a period of hot temperatures is expected. The combination of hot temperatures and high humidity will combine to create a situation in which heat illnesses are possible. Drink plenty of fluids...stay in an air-conditioned room...stay out of the sun...and check up on relatives and neighbors. 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 light weight and loose fitting clothing when possible and drink plenty of water. 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. && $$ IAZ001-012-013-020>022-SDZ050-052-057>060-063>071-200100- /O.CON.KFSD.HT.Y.0002.000000T0000Z-170720T0100Z/ Lyon IA-Sioux-O'Brien-Plymouth-Cherokee-Buena Vista-Gregory- Jerauld-Brule-Aurora-Davison-Hanson-Charles Mix-Douglas- Hutchinson-Turner-Lincoln SD-Bon Homme-Yankton-Clay SD-Union- 317 PM CDT Wed Jul 19 2017 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM CDT THIS EVENING... * TEMPERATURE...High temperatures will reach the mid 90s this afternoon producing heat index values between 100 and 105 degrees. * IMPACTS...The combination of hot temperatures and high humidity will increase the potential for heat-related stress and illness. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Heat Advisory means that a period of hot temperatures is expected. The combination of hot temperatures and high humidity will combine to create a situation in which heat illnesses are possible. Drink plenty of fluids...stay in an air-conditioned room...stay out of the sun...and check up on relatives and neighbors. Take extra precautions...if you work or spend time outside. When possible...reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear light weight and loose fitting clothing when possible and drink plenty of water. To reduce risk during outdoor work...the occupational safety and health administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency...call 9 1 1. && $$
888 WWUS73 KFSD 200108 NPWFSD URGENT - WEATHER MESSAGE National Weather Service Sioux Falls SD 808 PM CDT Wed Jul 19 2017 IAZ031-032-NEZ013-014-201145- /O.EXP.KFSD.HT.Y.0002.000000T0000Z-170720T0100Z/ /O.CON.KFSD.HT.Y.0003.170720T1800Z-170721T0100Z/ Woodbury-Ida-Dixon-Dakota- 808 PM CDT Wed Jul 19 2017 ...HEAT ADVISORY REMAINS IN EFFECT FROM 1 PM TO 8 PM CDT THURSDAY... ...HEAT ADVISORY HAS EXPIRED... * TEMPERATURE...High temperatures will reach the mid 90s Thursday afternoon producing heat index values between 100 and 105 degrees. * IMPACTS...The combination of hot temperatures and high humidity will increase the potential for heat-related stress and illness. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Heat Advisory means that a period of hot temperatures is expected. The combination of hot temperatures and high humidity will combine to create a situation in which heat illnesses are possible. Drink plenty of fluids...stay in an air-conditioned room...stay out of the sun...and check up on relatives and neighbors. 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 light weight and loose fitting clothing when possible and drink plenty of water. 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. && $$ IAZ001-012-013-020>022-SDZ050-052-057>060-063>071-200215- /O.EXP.KFSD.HT.Y.0002.000000T0000Z-170720T0100Z/ Lyon IA-Sioux-O'Brien-Plymouth-Cherokee-Buena Vista-Gregory- Jerauld-Brule-Aurora-Davison-Hanson-Charles Mix-Douglas- Hutchinson-Turner-Lincoln SD-Bon Homme-Yankton-Clay SD-Union- 808 PM CDT Wed Jul 19 2017 ...HEAT ADVISORY HAS EXPIRED... Heat index values will again approach 100 degrees Thursday afternoon. $$
179 WWUS73 KFSD 200805 NPWFSD URGENT - WEATHER MESSAGE National Weather Service Sioux Falls SD 305 AM CDT Thu Jul 20 2017 IAZ031-032-NEZ013-014-201615- /O.CON.KFSD.HT.Y.0003.170720T1800Z-170721T0100Z/ Woodbury-Ida-Dixon-Dakota- 305 AM CDT Thu Jul 20 2017 ...HEAT ADVISORY REMAINS IN EFFECT FROM 1 PM THIS AFTERNOON TO 8 PM CDT THIS EVENING... * TEMPERATURE...High temperatures will reach the mid 90s this afternoon producing heat index values between 100 and 105 degrees. * IMPACTS...The combination of hot temperatures and high humidity will increase the potential for heat-related stress and illness. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Heat Advisory means that a period of hot temperatures is expected. The combination of hot temperatures and high humidity will combine to create a situation in which heat illnesses are possible. Drink plenty of fluids...stay in an air-conditioned room...stay out of the sun...and check up on relatives and neighbors. 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 light weight and loose fitting clothing when possible and drink plenty of water. 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. && $$
452 WWUS73 KFSD 202025 NPWFSD URGENT - WEATHER MESSAGE National Weather Service Sioux Falls SD 325 PM CDT Thu Jul 20 2017 IAZ031-032-NEZ013-014-210430- /O.NEW.KFSD.HT.Y.0004.170721T1700Z-170722T0100Z/ /O.CON.KFSD.HT.Y.0003.000000T0000Z-170721T0100Z/ Woodbury-Ida-Dixon-Dakota- 325 PM CDT Thu Jul 20 2017 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM CDT THIS EVENING... ...HEAT ADVISORY IN EFFECT FROM NOON TO 8 PM CDT FRIDAY... The National Weather Service in Sioux Falls has issued a Heat Advisory, which is in effect from noon to 8 PM CDT Friday. * TEMPERATURE...High temperatures will reach the mid 90s this afternoon producing heat index values between 100 and 105 degrees. * IMPACTS...The combination of hot temperatures and high humidity will increase the potential for heat-related stress and illness. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Heat Advisory means that a period of hot temperatures is expected. The combination of hot temperatures and high humidity will combine to create a situation in which heat illnesses are possible. Drink plenty of fluids...stay in an air-conditioned room...stay out of the sun...and check up on relatives and neighbors. Take extra precautions...if you work or spend time outside. When possible...reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear light weight and loose fitting clothing when possible and drink plenty of water. To reduce risk during outdoor work...the occupational safety and health administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency...call 9 1 1. && $$ IAZ001-002-012-013-020>022-MNZ098-SDZ038-039-050-052>071-210430- /O.NEW.KFSD.HT.Y.0004.170721T1700Z-170722T0100Z/ Lyon IA-Osceola-Sioux-O'Brien-Plymouth-Cherokee-Buena Vista-Rock- Beadle-Kingsbury-Gregory-Jerauld-Sanborn-Miner-Lake-Moody-Brule- Aurora-Davison-Hanson-McCook-Minnehaha-Charles Mix-Douglas- Hutchinson-Turner-Lincoln SD-Bon Homme-Yankton-Clay SD-Union- 325 PM CDT Thu Jul 20 2017 ...HEAT ADVISORY IN EFFECT FROM NOON TO 8 PM CDT FRIDAY... The National Weather Service in Sioux Falls has issued a Heat Advisory, which is in effect from noon to 8 PM CDT Friday. * TEMPERATURE...High temperatures will reach the mid to upper 90s Friday afternoon and evening, producing heat index values from 100 to near 110 degrees. * IMPACTS...The combination of hot temperatures and high humidity will increase the potential for heat-related stress and illness. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Heat Advisory means that a period of hot temperatures is expected. The combination of hot temperatures and high humidity will combine to create a situation in which heat illnesses are possible. Drink plenty of fluids...stay in an air-conditioned room...stay out of the sun...and check up on relatives and neighbors. 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 light weight and loose fitting clothing when possible and drink plenty of water. 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. && $$
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 18, 2:57 PM CDT, 10 minutes earlier.
Area forecast discussion, Jul 18, 2:57 PM CDT, 10 minutes before
Area Forecast Discussion National Weather Service Sioux Falls SD 257 PM CDT Tue Jul 18 2017 .SHORT TERM...(This evening through Wednesday) Issued at 257 PM CDT Tue Jul 18 2017 Upper air analysis shows a ridge of high pressure centered over the central and southern through Wednesday, with a weak surface cold front extending from east to west just south of Interstate 90. The forecast area will remain on the southern edge of some pretty strong westerlies which reside to our north, and the surface front will make progress only to about Sioux City to Storm Lake before stalling. Spotty convection has broken out near the surface boundary across the heart of northwest Iowa. There is not a lot of upper forcing either right now or tonight to work with. PV along the 1.5 pressure surface is virtually non existent, so current thoughts are that convection will remain tied to the surface to 850mb wind shift line this evening. It is unstable, but with weak wind shear in the lowest couple of kilometers, do not think that severe potential will become widespread late this afternoon or evening due to a lack of upper forcing. Still, its certainly worth watching for the next several hours. Introduced some chances for TSRA late tonight between 06Z and 12Z Wednesday near the I 90 corridor as the low level jet shifts back to a southeasterly direction. The I 90 corridor is forecast to be along a wind shift late tonight from a southerly, to easterly direction, and fairly strong thetae advection maximized along 925mb is noted as it shifts off to the northwest late tonight. Did not want to go very high with the rain chances late tonight however due to rising heights and mid level warm air advection. The rising heights and mid level warm air advection continue into Wednesday. In fact by afternoon, both the nam and gfs have a bulk of of our forecast area at +14 to +15C at 700mb. With our frontal boundary currently where it is right now shifting back northward tonight, Wednesday looks to be hot and humid, with a heat advisory warranted for southeast and south central SD, as well as parts of northwest IA and extreme northeast Nebraska for heat index values of 100 to 105 degrees. Due to the very warm mid level temperatures, convective chances during the Wednesday day period are extremely small, although a few morning thunderstorms could be lingering in our northwest zones with the aforementioned thetae boundary lifting northward. Although highs will be in the 90s on Wednesday, convective temperatures are 100 to 105 degrees, so convective initiation in the afternoon is pretty remote. .LONG TERM...(Wednesday night through Tuesday) Issued at 257 PM CDT Tue Jul 18 2017 Unsettled pattern continues through the end of the week as a series of disturbances continue to slowly break down the ridge. Disturbances will kick off a series of chances for showers and strong to severe thunderstorms while temperatures will slowly become more seasonable as the ridge breaks down. Wave swings through Wednesday night bringing chances of rain to the Highway 14 corridor and southwest Minnesota. Instability will be plenty sufficient for thunderstorms with CAPE values over 3,000 J/kg expected. Deep layer shear is strong, with over 50 knots 0-6km shear, so expect convection to be well organized. However, convective inhibition remains a concern across our CWA with a fairly strong cap from 700-800mb seen on model soundings at BKX and MML. Models have trended accordingly and are now keeping most of the convection just north and northeast of our CWA. Nevertheless, will need to keep on eye on this impacting our northern and northeastern border, especially for severe wind gusts with DCAPE around 1,000 J/kg. Expected lack of lingering convective debris from Wednesday night will lead to a hot and muggy day in our southern zones. Heat indices are likely to exceed 100 around Sioux City. Will go ahead and issue a heat advisory for Thursday afternoon. As for precipitation, it will be deja vu all over again Thursday night, this time with only our edge in southwest Minnesota possibly being affected. Instability is sufficient but 700-800mb capping may once again keep the convection out of the CWA save for parts of Lyon and Cottonwood counties. Pattern calms considerably by Friday evening. GFS suggests a round of storms along and south of I-90 Saturday evening but will discount that for now as it is a significant outlier. But, the upper jet does linger just to our north through the weekend, so can't totally rule out showers and storms. However, QG support for broad lift and moisture are lacking so will keep chances low for now. && .AVIATION...(For the 18Z TAFS through 18Z Wednesday afternoon) Issued at 1213 PM CDT Tue Jul 18 2017 Main issue today and tonight is a weak cold frontal passage and associated TSRA chances. Currently at 17Z Tuesday, the frontal passage is close to Interstate 90, but it is difficult to ascertain whether this is the primary frontal wind shift, or residual outflow from thunderstorms in northern SD this morning. At any rate, the surface winds should generally veer to an easterly direction as the day progresses into tonight, with Sioux City's wind direction possibly the most variable, albeit fairly light in speed. Convective chances associated with the frontal boundary are quite a challenge. Right now, timed the TSRA as best as possible in the KFSD and KSUX TAF sites with not enough confidence to go a TEMPO group at this time. One final item to watch for, is if rainfall becomes widespread to the east of the Sioux Falls forecast area, we will have to watch for MVFR stratus in rain cooled air backing into the forecast area late tonight and early Wednesday. && .FSD WATCHES/WARNINGS/ADVISORIES... SD...None. MN...None. IA...None. NE...None. && SHORT TERM...MJ LONG TERM...Ferguson/ AVIATION...MJ
Hazardous weather outlook, Jul 18, 5:04 AM CDT, 10 hours 3 minutes before
Hazardous Weather Outlook National Weather Service Sioux Falls SD 504 AM CDT Tue Jul 18 2017 IAZ012-020>022-031-032-NEZ013-014-SDZ050-063>071-191015- Sioux-Plymouth-Cherokee-Buena Vista-Woodbury-Ida-Dixon-Dakota- Gregory-Charles Mix-Douglas-Hutchinson-Turner-Lincoln SD- Bon Homme-Yankton-Clay SD-Union- 504 AM CDT Tue Jul 18 2017 This Hazardous Weather Outlook is for portions of northwest Iowa, west central Iowa, northeast Nebraska, south central South Dakota, and southeast South Dakota. .DAY ONE...Today and Tonight Heat index values will once again approach 100 degrees in the Missouri River Valley today. Thunderstorms will be possible late this afternoon into this evening. Best chances for storms will be east of the James River. Hail to the size of half dollars, wind gusts to 65 mph, and an isolated tornado will be possible with stronger storms. Heavy rain will also be possible. .DAYS TWO THROUGH SEVEN...Wednesday through Monday The combination of heat and humidity will persist through mid-week, with heat index values in the 90s to near 105 across the area through Wednesday. Thunderstorms chances will arrive almost daily this week, bringing a potential for isolated strong to severe storms, as well as locally heavy rainfall, to parts of the region through Friday. The primary risks in thunderstorms will be damaging winds, along with a large hail threat. .SPOTTER INFORMATION STATEMENT... Spotter activation is likely after 5 pm. SDZ038>040-052>054-057>060-191015- Beadle-Kingsbury-Brookings-Jerauld-Sanborn-Miner-Brule-Aurora- Davison-Hanson- 504 AM CDT Tue Jul 18 2017 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 Thunderstorms will be possible this morning. An isolated storm may produce hail to the size of quarters or wind gust to 60 mph. .DAYS TWO THROUGH SEVEN...Wednesday through Monday The chance for mainly nighttime thunderstorms will bring a potential for isolated strong to severe storms, as well as locally heavy rainfall, to parts of the region through Friday. Although areas near and to the north of Interstate 90 are currently more favored to see storms, timing and location are uncertain. At this time, the greatest risks for strong thunderstorms are focused on Wednesday afternoon and evening, and again by Friday. While afternoon temperatures will ultimately depend on the extent of overnight thunderstorm activity, heat index values in the 90s to lower 100s will be possible at times through the upcoming week. .SPOTTER INFORMATION STATEMENT... Spotter activation is possible through noon today. IAZ001>003-013-014-MNZ071-072-080-081-089-090-097-098-SDZ055-056- 061-062-191015- Lyon IA-Osceola-Dickinson-O'Brien-Clay IA-Lincoln MN-Lyon MN- Murray-Cottonwood-Nobles-Jackson-Pipestone-Rock-Lake-Moody-McCook- Minnehaha- 504 AM CDT Tue Jul 18 2017 This Hazardous Weather Outlook is for portions of northwest Iowa, southwest Minnesota, east central South Dakota, and southeast South Dakota. .DAY ONE...Today and Tonight A complex of storms across northeast south Dakota may try to build south through late morning into the early afternoon. Wind gusts up to 60 mph and hail to the size of ping pong balls are possible with the strongest storms. Heavy rainfall will also be possible. .DAYS TWO THROUGH SEVEN...Wednesday through Monday Nearly daily thunderstorm chances through Friday may bring the risk of locally heavy rainfall and pockets of severe weather. At this time, the greatest risks for strong thunderstorms are focused on Tuesday afternoon, Wednesday afternoon and evening, and again by Friday. Damaging winds and large hail will be the primary risks. While afternoon temperatures will ultimately depend on the extent of overnight thunderstorm activity, heat index values in the 90s to lower 100s will be possible across mainly northwest Iowa. .SPOTTER INFORMATION STATEMENT... Spotter activation is likely after 10 am this morning.
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 18, 3:07 PM CDT | Heat Advisory | FSD | Buena Vista, Cherokee, Ida, Lyon, O'Brien, Plymouth and 2 more | 29 hr |
Nearby
Heat Advisories in Iowa, 2017Heat Advisories in Nebraska, 2017Every heat advisory in 2017
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.