Alert archive / Oregon / Frost Advisories in 2021
Frost Advisory 13, NWS Medford, OR
NWS Medford, OR issued this frost advisory at Nov 16, 2021, 2:00 PM PST for Coos County, Douglas County, Oregon. It took effect at Nov 17, 2021, 1:00 AM PST. It was in force for 7 hr.
The area
The counties it named.
The facts
- Issued
- Nov 16, 2021, 2:00 PM PST (22:00 UTC)
- In effect from
- Nov 17, 2021, 1:00 AM PST
- Expired
- Nov 17, 2021, 8:00 AM PST
- In force
- 7 hr
- Issued by
- NWS Medford, OR
Counties Coos County, OR, Douglas County, OR
The radar
The Medford radar (KMAX), 149 km from the middle of the area, began a volume at 21:58 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, 10.0 hours before the alert went out and 118 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
- 1026 m above ground
- 0-6 km bulk shear
- 60 kt
- 0-1 km storm-relative helicity
- -3 m²/s²
- 0-3 km storm-relative helicity
- 37 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
711 WWUS76 KMFR 162200 NPWMFR URGENT - WEATHER MESSAGE National Weather Service Medford OR 200 PM PST Tue Nov 16 2021 ORZ023-171300- /O.NEW.KMFR.FR.Y.0013.211117T0900Z-211117T1600Z/ /O.CON.KMFR.FZ.W.0013.211117T0900Z-211117T1600Z/ Central Douglas County- Including the cities of Drain, Elkton, Roseburg, Sutherlin, Green, Myrtle Creek, Canyonville, and Glendale 200 PM PST Tue Nov 16 2021 ...FROST ADVISORY IN EFFECT FROM 1 AM TO 8 AM PST WEDNESDAY... ...FREEZE WARNING REMAINS IN EFFECT FROM 1 AM TO 8 AM PST WEDNESDAY... * WHAT...For the Freeze Warning, sub-freezing temperatures as low as 30 expected. For the Frost Advisory, temperatures in the 33 to 36 degree range will result in frost formation. * WHERE...Central Douglas County. * WHEN...From 1 AM to 8 AM PST Wednesday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. * 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. && $$ Visit us at https://www.weather.gov/Medford
3 follow-up statements
509 WWUS76 KMFR 162224 CCA NPWMFR URGENT - WEATHER MESSAGE...CORRECTED National Weather Service Medford OR 224 PM PST Tue Nov 16 2021 ORZ023-171300- /O.COR.KMFR.FR.Y.0013.211117T0900Z-211117T1600Z/ /O.COR.KMFR.FZ.W.0013.211117T0900Z-211117T1600Z/ Central Douglas County- Including the cities of Drain, Elkton, Roseburg, Sutherlin, Green, Myrtle Creek, Canyonville, and Glendale 224 PM PST Tue Nov 16 2021 ...FROST ADVISORY IN EFFECT FROM 1 AM TO 8 AM PST WEDNESDAY... ...FREEZE WARNING REMAINS IN EFFECT FROM 1 AM TO 8 AM PST WEDNESDAY... * WHAT...For the Freeze Warning, sub-freezing temperatures as low as 30 expected. For the Frost Advisory, temperatures in the 33 to 36 degree range will result in frost formation. * WHERE...Central Douglas County. Cities in the Freeze Warning include Sutherlin, Drain, Curtin, Camas Valley, Yoncalla, and Myrtle Creek. Cities in the Frost Advisory include Roseburg, Elkton, Scottsburg, Riddle, Canyonville, Azalea, and Tiller. * WHEN...From 1 AM to 8 AM PST Wednesday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. * View the hazard area in detail at https://www.wrh.noaa.gov/map/?wfo=mfr PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. && $$ Visit us at https://www.weather.gov/Medford
248 WWUS76 KMFR 171132 NPWMFR URGENT - WEATHER MESSAGE National Weather Service Medford OR 332 AM PST Wed Nov 17 2021 ORZ023-171600- /O.CON.KMFR.FZ.W.0013.000000T0000Z-211117T1600Z/ /O.CON.KMFR.FR.Y.0013.000000T0000Z-211117T1600Z/ Central Douglas County- Including the cities of Drain, Elkton, Roseburg, Sutherlin, Green, Myrtle Creek, Canyonville, and Glendale 332 AM PST Wed Nov 17 2021 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 8 AM PST THIS MORNING... ...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM PST THIS MORNING... * WHAT...For the Freeze Warning, sub-freezing temperatures as low as 30 expected. For the Frost Advisory, temperatures in the 33 to 35 degree range will result in frost formation. * WHERE...Central Douglas County. Cities in the Freeze Warning include Sutherlin, Drain, Curtin, Camas Valley, Yoncalla, and Myrtle Creek. Cities in the Frost Advisory include Roseburg, Elkton, Scottsburg, Riddle, Canyonville, Azalea, and Tiller. * WHEN...Until 8 AM PST this morning. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. * 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. && $$ Visit us at https://www.weather.gov/Medford
500 WWUS76 KMFR 171555 NPWMFR URGENT - WEATHER MESSAGE National Weather Service Medford OR 755 AM PST Wed Nov 17 2021 ORZ023-171700- /O.EXP.KMFR.FZ.W.0013.000000T0000Z-211117T1600Z/ /O.EXP.KMFR.FR.Y.0013.000000T0000Z-211117T1600Z/ Central Douglas County- Including the cities of Drain, Elkton, Roseburg, Sutherlin, Green, Myrtle Creek, Canyonville, and Glendale 755 AM PST Wed Nov 17 2021 ...FREEZE WARNING WILL EXPIRE AT 8 AM PST THIS MORNING... ...FROST ADVISORY WILL EXPIRE AT 8 AM PST THIS MORNING... Reported low temperatures ranged from the upper 20s to middle 30s across the area. $$ 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 |
|---|---|---|---|---|
| Nov 15, 9:33 PM PST | Freeze Watch | MFR | Coos, Douglas | 4 hr |
| Nov 16, 1:43 AM PST | Freeze Warning | MFR | Coos, Douglas | 30 hr |
| Nov 16, 2:03 AM PST | Hazardous Seas Warning | MFR | 35 hr |
Nearby
Frost Advisories in Oregon, 2021Every frost 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.