Alert archive / Minnesota / Frost Advisories in 2017

Frost Advisory 1, NWS Duluth, MN

May 18, 20175 counties in Minnesota

NWS Duluth, MN issued this frost advisory at May 18, 2017, 3:08 PM CDT for 5 counties in Minnesota. It took effect at May 19, 2017, 12:00 AM CDT. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued: May 18, 2017, 3:08 PM CDT (20:08 UTC)
In effect from: May 19, 2017, 12:00 AM CDT
Expired: May 19, 2017, 6:00 AM CDT
In force: 6 hr
Issued by: NWS Duluth, MN

Counties Cass County, MN, Cook County, MN, Crow Wing County, MN, Lake County, MN, Saint Louis County, MN

The radar

The Duluth radar (KDLH), 55 km from the middle of the area, began a volume at 20:05 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

International Fa, MN (KINL), launched 12:00Z, 8.1 hours before the alert went out and 154 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: 614 m above ground
0-6 km bulk shear: 1 kt
0-1 km storm-relative helicity: -154 m²/s²
0-3 km storm-relative helicity: -63 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 Duluth, MN wrote its last area forecast discussion before this frost advisory went out at May 17, 6:27 PM CDT, 20 hours 41 minutes earlier.

Area forecast discussion, May 17, 6:27 PM CDT, 20 hours 41 minutes before

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Hazardous weather outlook, May 17, 3:46 PM CDT, 23 hours 22 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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The office that day

Everything else NWS Duluth, MN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 18, 3:08 PM CDT	Freeze Warning	DLH	Aitkin, Carlton, Cook, Itasca, Koochiching, Lake and 2 more	15 hr
May 17, 7:42 PM CDT	Special Weather Statement	DLH	Price	18 min
May 17, 7:59 PM CDT	Special Weather Statement	DLH	Price	16 min

Nearby

Frost Advisories in Minnesota, 2017 Every frost advisory in 2017

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.