Alert archive / Oregon / Frost Advisories in 2017

Frost Advisory 22, NWS Medford, OR

October 14, 2017Coos County, Curry County, Douglas County, Oregon

NWS Medford, OR issued this frost advisory at Oct 14, 2017, 2:26 PM PDT for Coos County, Curry County, Douglas County, Oregon. It took effect at Oct 15, 2017, 2:00 AM PDT. It was in force for 7 hr.

The area

The counties it named.

The facts

Issued: Oct 14, 2017, 2:26 PM PDT (21:26 UTC)
In effect from: Oct 15, 2017, 2:00 AM PDT
Expired: Oct 15, 2017, 9:00 AM PDT
In force: 7 hr
Issued by: NWS Medford, OR

Counties Coos County, OR, Curry County, OR, Douglas County, OR

The radar

The Medford radar (KMAX), 135 km from the middle of the area, began a volume at 21:27 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, 9.4 hours before the alert went out and 108 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: 814 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: -71 m²/s²
0-3 km storm-relative helicity: -121 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 13, 4:43 PM PDT, 21 hours 43 minutes earlier.

Area forecast discussion, Oct 13, 4:43 PM PDT, 21 hours 43 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 13, 6:34 PM PDT	Freeze Warning	MFR	Curry, Jackson, Josephine	14 hr
Oct 13, 8:04 PM PDT	Frost Advisory	MFR	Coos, Curry, Douglas	13 hr
Oct 14, 2:26 PM PDT	Freeze Warning	MFR	Curry, Jackson, Josephine, Klamath	19 hr
Oct 14, 2:57 PM PDT	Small Craft Advisory	MFR		26 hr

Nearby

Frost Advisories in Oregon, 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.