Alert archive / South Dakota / Frost Advisories in 2006

Frost Advisory 1, NWS Sioux Falls, SD

September 19, 200613 counties in South Dakota; 11 counties in Iowa; 8 counties in Minnesota

NWS Sioux Falls, SD issued this frost advisory at Sep 19, 2006, 3:50 AM CDT for 13 counties in South Dakota; 11 counties in Iowa; 8 counties in Minnesota. It took effect at Sep 19, 2006, 3:33 PM CDT. It was in force for 16 hr.

The area

The counties it named.

The facts

Issued: Sep 19, 2006, 3:50 AM CDT (08:50 UTC)
In effect from: Sep 19, 2006, 3:33 PM CDT
Expired: Sep 20, 2006, 8:00 AM CDT
In force: 16 hr
Issued by: NWS Sioux Falls, SD

All 32 counties

Buena Vista County, IA, Cherokee County, IA, Clay County, IA, Dickinson County, IA, Ida County, IA, Lyon County, IA, O'Brien County, IA, Osceola County, IA, Plymouth County, IA, Sioux County, IA, Woodbury County, IA, Cottonwood County, MN, Jackson County, MN, Lincoln County, MN, Lyon County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Rock County, MN, Beadle County, SD, Brookings County, SD, Hanson County, SD, Kingsbury County, SD, Lake County, SD, Lincoln County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Sanborn County, SD, Turner County, SD, Union County, SD

The radar

The Sioux Falls radar (KFSD), 30 km from the middle of the area, began a volume at 08:54 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, 8.8 hours before the alert went out and 262 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: 13 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 636 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 130 m²/s²
0-3 km storm-relative helicity: 135 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 Sioux Falls, SD wrote its last area forecast discussion before this frost advisory went out at Sep 18, 3:20 PM CDT, 12 hours 30 minutes earlier.

Area forecast discussion, Sep 18, 3:20 PM CDT, 12 hours 30 minutes before

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Hazardous weather outlook, Sep 18, 10:26 AM CDT, 17 hours 24 minutes before

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Nearby

Frost Advisories in South Dakota, 2006 Frost Advisories in Iowa, 2006 Frost Advisories in Minnesota, 2006 Every frost advisory in 2006

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.