Alert archive / Oregon / Frost Advisories in 2018

Frost Advisory 11, NWS Medford, OR

October 15, 20185 counties in Oregon; Siskiyou County, California

NWS Medford, OR issued this frost advisory at Oct 15, 2018, 2:20 PM PDT for 5 counties in Oregon; Siskiyou County, California. It took effect at Oct 16, 2018, 2:00 AM PDT. It was in force for 7 hr.

The area

The counties it named.

The facts

Issued: Oct 15, 2018, 2:20 PM PDT (21:20 UTC)
In effect from: Oct 16, 2018, 2:00 AM PDT
Expired: Oct 16, 2018, 9:00 AM PDT
In force: 7 hr
Issued by: NWS Medford, OR

Counties Siskiyou County, CA, Coos County, OR, Curry County, OR, Douglas County, OR, Jackson County, OR, Josephine County, OR

The radar

The Medford radar (KMAX), 76 km from the middle of the area, began a volume at 21:11 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

Medford/Jackson, OR (KMFR), launched 12:00Z, 9.3 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: 3970 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: -117 m²/s²
0-3 km storm-relative helicity: -9 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 Medford, OR wrote its last area forecast discussion before this frost advisory went out at Oct 15, 8:00 AM PDT, 6 hours 20 minutes earlier.

Area forecast discussion, Oct 15, 8:00 AM PDT, 6 hours 20 minutes before

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The office that day

Everything else NWS Medford, OR issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 15, 3:26 AM PDT	Freeze Watch	MFR	Curry, Josephine	11 hr
Oct 15, 1:35 PM PDT	Beach Hazards Statement	MFR	Coos, Curry, Douglas	57 hr
Oct 15, 2:20 PM PDT	Freeze Warning	MFR	Curry, Jackson, Josephine	19 hr

Nearby

Frost Advisories in Oregon, 2018 Frost Advisories in California, 2018 Every frost advisory in 2018

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.