Alert archive / Oregon / Freeze Warnings in 2021
Freeze Warning 4, NWS Medford, OR
NWS Medford, OR issued this freeze warning at Apr 5, 2021, 9:00 PM PDT for Curry County, Jackson County, Josephine County, Oregon. It took effect at Apr 6, 2021, 3:00 AM PDT. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Apr 5, 2021, 9:00 PM PDT (04:00 UTC)
- In effect from
- Apr 6, 2021, 3:00 AM PDT
- Expired
- Apr 6, 2021, 9:00 AM PDT
- In force
- 6 hr
- Issued by
- NWS Medford, OR
Counties Curry County, OR, Jackson County, OR, Josephine County, OR
The radar
The Medford radar (KMAX), 75 km from the middle of the area, began a volume at 04:01 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 00:00Z, 4.0 hours before the alert went out and 58 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
- 2733 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 2 m²/s²
- 0-3 km storm-relative helicity
- -54 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
109 WWUS76 KMFR 060400 NPWMFR URGENT - WEATHER MESSAGE National Weather Service Medford OR 900 PM PDT Mon Apr 5 2021 ORZ024-026-061600- /O.NEW.KMFR.FZ.W.0004.210406T1000Z-210406T1600Z/ Eastern Curry County and Josephine County-Jackson County- Including the city of Cave Junction 900 PM PDT Mon Apr 5 2021 ...FREEZE WARNING IN EFFECT FROM 3 AM TO 9 AM PDT TUESDAY... * WHAT...Sub-freezing temperatures as low as 28 expected. * WHERE...The Illinois Valley, the Applegate Valley, and rural portions of the Rogue Valley. Additionally, the communities of Rogue River, Gold Hill, and Shady Cove are included. * WHEN...From 3 AM to 9 AM PDT Tuesday. * IMPACTS...Freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. * ADDITIONAL DETAILS...The inversion will be relatively strong tonight, so wind machines may be effective in mixing warmer air aloft to the surface. * View the hazard area in detail at https://www.wrh.noaa.gov/map/?wfo=mfr PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. && $$ Visit us at https://www.weather.gov/Medford
1 follow-up statement
862 WWUS76 KMFR 061607 NPWMFR URGENT - WEATHER MESSAGE National Weather Service Medford OR 907 AM PDT Tue Apr 6 2021 ORZ024-026-061715- /O.EXP.KMFR.FZ.W.0004.000000T0000Z-210406T1600Z/ Eastern Curry County and Josephine County-Jackson County- Including the city of Cave Junction 907 AM PDT Tue Apr 6 2021 ...FREEZE WARNING HAS EXPIRED... The freeze warning has expired. Morning lows in the valleys of Josephine and Jackson counties ranged from the mid 20s to lower 30s. $$ Visit us at https://www.weather.gov/Medford
The office that day
Everything else NWS Medford, OR issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 6, 2:23 PM PDT | Freeze Warning | MFR | Curry, Jackson, Josephine | 19 hr |
Nearby
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.