Alert archive / South Dakota / Freeze Watches in 2021
Freeze Watch 1, NWS Aberdeen, SD
NWS Aberdeen, SD issued this freeze watch at May 27, 2021, 3:26 AM CDT for 9 counties in South Dakota; Traverse County, Minnesota. It took effect at May 28, 2021, 1:00 AM CDT. It was in force for .
The area
The counties it named.
The facts
- Issued
- May 27, 2021, 3:26 AM CDT (08:26 UTC)
- In effect from
- May 28, 2021, 1:00 AM CDT
- Expired
- May 27, 2021, 2:46 PM CDT
- In force
- Issued by
- NWS Aberdeen, SD
Counties Traverse County, MN, Brown County, SD, Campbell County, SD, Corson County, SD, Day County, SD, Edmunds County, SD, Marshall County, SD, McPherson County, SD, Roberts County, SD, Walworth County, SD
The radar
The Aberdeen radar (KABR), 27 km from the middle of the area, began a volume at 08:29 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
Rapid City, SD (KUNR), launched 00:00Z, 8.4 hours before the alert went out and 374 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 570 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 370 m²/s²
- 0-3 km storm-relative helicity
- 626 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this freeze watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Aberdeen, SD wrote its last area forecast discussion before this freeze watch went out at May 27, 3:15 AM CDT, 11 minutes earlier.
Area forecast discussion, May 27, 3:15 AM CDT, 11 minutes before
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</html>The office that day
Everything else NWS Aberdeen, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 27, 2:46 PM CDT | Freeze Warning | ABR | Brown, Clark, Codington, Day, Deuel, Edmunds and 6 more | 17 hr |
Nearby
Freeze Watches in South Dakota, 2021Freeze Watches in Minnesota, 2021Every freeze watch 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.