Alert archive / South Dakota / Heat Advisories in 2018

Heat Advisory 4, NWS Sioux Falls, SD

July 3, 201812 counties in South Dakota

NWS Sioux Falls, SD issued this heat advisory at Jul 3, 2018, 3:43 AM CDT for 12 counties in South Dakota. It took effect at Jul 3, 2018, 2:00 PM CDT. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued
Jul 3, 2018, 3:43 AM CDT (08:43 UTC)
In effect from
Jul 3, 2018, 2:00 PM CDT
Expired
Jul 3, 2018, 8:00 PM CDT
In force
6 hr
Issued by
NWS Sioux Falls, SD

Counties Aurora County, SD, Beadle County, SD, Bon Homme County, SD, Brule County, SD, Charles Mix County, SD, Davison County, SD, Douglas County, SD, Hanson County, SD, Hutchinson County, SD, Jerauld County, SD, Sanborn County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 120 km from the middle of the area, began a volume at 08:45 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, 8.7 hours before the alert went out and 145 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-pSkew-T log-p diagram, Aberdeen, SD at 00:00Z on 2018-07-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2124 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Aberdeen, SD at 00:00Z on 2018-07-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 113 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
2124 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
1720 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
113 m²/s²
0-3 km storm-relative helicity
157 m²/s²
Significant tornado parameter
0.4
Supercell composite
8.5

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 2, 11:03 PM CDT, 4 hours 40 minutes earlier.

Area forecast discussion, Jul 2, 11:03 PM CDT, 4 hours 40 minutes before
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Hazardous weather outlook, Jul 2, 7:24 PM CDT, 8 hours 19 minutes before
Hazardous Weather Outlook
National Weather Service Sioux Falls SD
724 PM CDT Mon Jul 2 2018

IAZ002-003-012>014-020>022-031-032-MNZ090-NEZ013-014-SDZ071-
040030-
Osceola-Dickinson-Sioux-O'Brien-Clay IA-Plymouth-Cherokee-
Buena Vista-Woodbury-Ida-Jackson-Dixon-Dakota-Union-
724 PM CDT Mon Jul 2 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

Moderate to major flooding will continue on many rivers. Those
with interest along area rivers will want to remain alert. For
specific river details, visit:
https://water.weather.gov.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Heat indices will climb to near 100 Wednesday afternoon.

There is a chance of thunderstorms Wednesday night. A few of the
storms may be strong producing strong winds and hail.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated.

IAZ001-MNZ080-081-089-097-098-SDZ056-060>062-065>070-040030-
Lyon IA-Murray-Cottonwood-Nobles-Pipestone-Rock-Moody-Hanson-
McCook-Minnehaha-Hutchinson-Turner-Lincoln SD-Bon Homme-Yankton-
Clay SD-
724 PM CDT Mon Jul 2 2018

This Hazardous Weather Outlook is for portions of northwest Iowa,
southwest Minnesota, east central South Dakota, and southeast
South Dakota.

.DAY ONE...Tonight

There is a slight chance of thunderstorms tonight into Tuesday
morning. These storms are not expected to be severe.

Minor to moderate flooding will continue on some rivers,
especially the Vermillion and Big Sioux. Those with interest
along area rivers will want to remain alert. For specific river
details, visit:
https://water.weather.gov.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Thunderstorms are possible across the region Tuesday night. These
storms are not expected to be severe. Additional storms are
possible Wednesday night. A few of these storms may be strong
producing strong winds or large hail.

Heat and humidity will increase across the region creating heat
indices near 100 Wednesday afternoon.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated.

MNZ071-072-SDZ038>040-050-052>055-057>059-063-064-040030-
Lincoln MN-Lyon MN-Beadle-Kingsbury-Brookings-Gregory-Jerauld-
Sanborn-Miner-Lake-Brule-Aurora-Davison-Charles Mix-Douglas-
724 PM CDT Mon Jul 2 2018

This Hazardous Weather Outlook is for portions of southwest
Minnesota, central South Dakota, east central South Dakota, south
central South Dakota, and southeast South Dakota.

.DAY ONE...Tonight

Thunderstorms are possible this evening into the overnight. A few
storms may be strong to severe producing large hail up to the
size of ping pong balls and damaging winds up to 60 mph.
Monday

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Heat indices will approach 100 degrees Tuesday and Wednesday
afternoon.

Thunderstorms are once again possible Tuesday and Wednesday
evenings into the overnight hours. A few storms may be strong
producing large hail and damaging winds.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is possible into tonight.

The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 3, 10:11 AM CDTRiver Flood WarningFSDMinnehaha46 hr
Jul 3, 11:11 AM CDTRiver Flood WarningFSDMinnehaha47 hr
Jul 3, 6:37 PM CDTRiver Flood WarningFSDMoody38 hr
Jul 3, 10:11 AM CDTRiver Flood WarningFSDLyon53 hr
Jul 3, 10:11 AM CDTRiver Flood WarningFSDLyon4 days
Jul 3, 11:11 AM CDTRiver Flood WarningFSDLyon, Sioux4 days
Jul 3, 2:20 AM CDTFlash Flood WarningFSDLyon11 hr
Jul 3, 4:39 AM CDTFlash Flood WarningFSDLyon9 hr
Jul 3, 5:36 AM CDTSevere Thunderstorm WarningFSDLyon, Murray, Pipestone13 min
Jul 3, 6:37 AM CDTFlash Flood Warning EmergencyFSDMurray7 hr
Jul 3, 7:11 AM CDTFlash Flood WarningFSDCottonwood6 hr
Jul 3, 7:24 AM CDTFlash Flood WarningFSDPipestone6 hr
Jul 3, 7:50 AM CDTFlash Flood WarningFSDMurray, Nobles, Pipestone, Rock5 hr
Jul 3, 8:28 AM CDTSevere Thunderstorm WarningFSDMurray, Nobles47 min
Jul 3, 8:31 AM CDTFlash Flood WarningFSDMurray, Nobles5 hr
Jul 3, 9:52 AM CDTSevere Thunderstorm WarningFSDCottonwood, Jackson, Murray, Nobles38 min
Jul 3, 10:05 AM CDTRiver Flood WarningFSDLyon4 days
Jul 3, 11:42 AM CDTRiver Flood WarningFSDPipestone24 hr
Jul 3, 1:09 PM CDTAreal Flood WarningFSDCottonwood, Lyon, Murray, Pipestone24 hr

Nearby

Heat Advisories in South Dakota, 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.