Alert archive / South Dakota / Frost Advisories in 2020

Frost Advisory 1, NWS Aberdeen, SD

September 8, 202010 counties in South Dakota; Big Stone County, Traverse County, Minnesota

NWS Aberdeen, SD issued this frost advisory at Sep 8, 2020, 3:29 PM CDT for 10 counties in South Dakota; Big Stone County, Traverse County, Minnesota. It took effect at Sep 9, 2020, 3:00 AM CDT. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued
Sep 8, 2020, 3:29 PM CDT (20:29 UTC)
In effect from
Sep 9, 2020, 3:00 AM CDT
Expired
Sep 9, 2020, 9:00 AM CDT
In force
6 hr
Issued by
NWS Aberdeen, SD

Counties Big Stone County, MN, Traverse County, MN, Brown County, SD, Day County, SD, Faulk County, SD, Hughes County, SD, Hyde County, SD, Jones County, SD, Marshall County, SD, Roberts County, SD, Stanley County, SD, Sully County, SD

The radar

The Aberdeen radar (KABR), 48 km from the middle of the area, began a volume at 20:33 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 12:00Z, 8.5 hours before the alert went out and 25 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 12:00Z on 2020-09-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 12:00Z on 2020-09-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -107 square meters per square second.1939587897117Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1079 m above ground
0-6 km bulk shear
72 kt
0-1 km storm-relative helicity
-107 m²/s²
0-3 km storm-relative helicity
-35 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 8, 3:29 PM CDTFreeze WarningABRCampbell, Corson, Dewey, Edmunds, McPherson, Potter and 1 more18 hr

Nearby

Frost Advisories in South Dakota, 2020Frost Advisories in Minnesota, 2020Every frost advisory in 2020

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.