Alert archive / South Dakota / Frost Advisories in 2011

Frost Advisory 1, NWS Aberdeen, SD

May 15, 201116 counties in South Dakota; Big Stone County, Traverse County, Minnesota

NWS Aberdeen, SD issued this frost advisory at May 15, 2011, 3:23 PM CDT for 16 counties in South Dakota; Big Stone County, Traverse County, Minnesota. It took effect at May 16, 2011, 4:00 AM CDT. It was in force for .

The area

The counties it named.

The facts

Issued: May 15, 2011, 3:23 PM CDT (20:23 UTC)
In effect from: May 16, 2011, 4:00 AM CDT
Expired: May 16, 2011, 3:59 AM CDT
In force
Issued by: NWS Aberdeen, SD

Counties Big Stone County, MN, Traverse County, MN, Brown County, SD, Campbell County, SD, Clark County, SD, Codington County, SD, Day County, SD, Deuel County, SD, Edmunds County, SD, Faulk County, SD, Grant County, SD, Hamlin County, SD, Hand County, SD, Marshall County, SD, McPherson County, SD, Roberts County, SD, Spink County, SD, Walworth County, SD

The radar

The Aberdeen radar (KABR), 38 km from the middle of the area, began a volume at 20:30 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, 8.4 hours before the alert went out and 52 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2088 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 108 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this frost advisory 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 frost advisory went out at May 15, 10:26 AM CDT, 4 hours 57 minutes earlier.

Area forecast discussion, May 15, 10:26 AM CDT, 4 hours 57 minutes before

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Hazardous weather outlook, May 15, 3:34 AM CDT, 11 hours 49 minutes before

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Nearby

Frost Advisories in South Dakota, 2011 Frost Advisories in Minnesota, 2011 Every frost advisory in 2011

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.