Alert archive / Oregon / Winter Weather Advisories in 2021
Winter Weather Advisory 28, NWS Medford, OR
NWS Medford, OR issued this winter weather advisory at May 18, 2021, 1:00 PM PDT for Klamath County, Lake County, Oregon; Modoc County, California. It took effect at May 19, 2021, 11:00 PM PDT. It was in force for 9 hr.
The area
The counties it named.
The facts
- Issued
- May 18, 2021, 1:00 PM PDT (20:00 UTC)
- In effect from
- May 19, 2021, 11:00 PM PDT
- Expired
- May 20, 2021, 8:00 AM PDT
- In force
- 9 hr
- Issued by
- NWS Medford, OR
Counties Modoc County, CA, Klamath County, OR, Lake County, OR
The radar
The Medford radar (KMAX), 151 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
Reno, NV (KREV), launched 12:00Z, 8.0 hours before the alert went out and 385 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2548 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 55 m²/s²
- 0-3 km storm-relative helicity
- 37 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this winter weather 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 winter weather advisory went out at May 18, 11:04 AM PDT, 1 hour 56 minutes earlier.
Area forecast discussion, May 18, 11:04 AM PDT, 1 hour 56 minutes before
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</html>The office that day
Everything else NWS Medford, OR issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 18, 1:23 AM PDT | Small Craft Advisory | MFR | 5 days |
Nearby
Winter Weather Advisories in Oregon, 2021Winter Weather Advisories in California, 2021Every winter weather advisory in 2021
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.