Alert archive / Iowa / Frost Advisories in 2023

Frost Advisory 1, NWS Sioux Falls, SD

October 6, 2023Buena Vista County, Clay County, Dickinson County, Iowa; Cottonwood County, Jackson County, Lyon County, Minnesota

NWS Sioux Falls, SD issued this frost advisory at Oct 6, 2023, 2:48 AM CDT for Buena Vista County, Clay County, Dickinson County, Iowa; Cottonwood County, Jackson County, Lyon County, Minnesota. It took effect at Oct 7, 2023, 12:00 AM CDT. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued
Oct 6, 2023, 2:48 AM CDT (07:48 UTC)
In effect from
Oct 7, 2023, 12:00 AM CDT
Expired
Oct 7, 2023, 9:00 AM CDT
In force
9 hr
Issued by
NWS Sioux Falls, SD

Counties Buena Vista County, IA, Clay County, IA, Dickinson County, IA, Cottonwood County, MN, Jackson County, MN, Lyon County, MN

The radar

The Sioux Falls radar (KFSD), 118 km from the middle of the area, began a volume at 07:53 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

Minneapolis, MN (KMPX), launched 00:00Z, 7.8 hours before the alert went out and 197 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, Minneapolis, MN at 00:00Z on 2023-10-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 27 joules per kilogram.LCLLFCEL10008507005003002001001 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, Minneapolis, MN at 00:00Z on 2023-10-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 88 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
27 J/kg
Mixed-layer CIN
-20 J/kg
Mixed-layer LCL
1329 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
88 m²/s²
0-3 km storm-relative helicity
112 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 6, 2:48 AM CDTFreeze WarningFSDAurora, Beadle, Bon Homme, Brookings, Brule, Charles Mix and 18 more30 hr

Nearby

Frost Advisories in Iowa, 2023Frost Advisories in Minnesota, 2023Every frost advisory in 2023

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.