Alert archive / Oregon / Frost Advisories in 2021
Frost Advisory 6, NWS Medford, OR
NWS Medford, OR issued this frost advisory at Apr 8, 2021, 5:11 AM PDT for Coos County, Curry County, Douglas County, Oregon. It took effect at Apr 9, 2021, 2:00 AM PDT. It was in force for 7 hr.
The area
The counties it named.
The facts
- Issued
- Apr 8, 2021, 5:11 AM PDT (12:11 UTC)
- In effect from
- Apr 9, 2021, 2:00 AM PDT
- Expired
- Apr 9, 2021, 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 12:18 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, 0.2 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 944 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 29 m²/s²
- 0-3 km storm-relative helicity
- 134 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
068 WWUS76 KMFR 081211 NPWMFR URGENT - WEATHER MESSAGE National Weather Service Medford OR 511 AM PDT Thu Apr 8 2021 ORZ024-026-090000- /O.UPG.KMFR.FZ.A.0002.210409T0900Z-210409T1600Z/ /O.NEW.KMFR.FZ.W.0006.210409T0900Z-210409T1600Z/ Eastern Curry County and Josephine County-Jackson County- Including the cities of Grants Pass, Cave Junction, Medford, and Ashland 511 AM PDT Thu Apr 8 2021 ...FREEZE WARNING IN EFFECT FROM 2 AM TO 9 AM PDT FRIDAY... * WHAT...Sub-freezing temperatures as low as 25 expected. * WHERE...Valleys of Josephine and Jackson Counties, including Medford, Grants Pass, Ashland, Talent, Phoenix, Eagle Point, Shady Cove, Williams, Provolt, Merlin, Selma, Cave Junction and Obrien. * WHEN...From 2 AM to 9 AM PDT Friday. * IMPACTS...Sub-freezing conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. * ADDITIONAL DETAILS...This is a cold air mass, but there may be enough of an inversion for wind machines to be effective in mixing somewhat 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. && $$ ORZ023-090000- /O.UPG.KMFR.FZ.A.0002.210409T0900Z-210409T1600Z/ /O.NEW.KMFR.FZ.W.0006.210409T0900Z-210409T1600Z/ Central Douglas County- Including the cities of Drain, Elkton, Roseburg, Sutherlin, Green, Myrtle Creek, Canyonville, and Glendale 511 AM PDT Thu Apr 8 2021 ...FREEZE WARNING IN EFFECT FROM 2 AM TO 9 AM PDT FRIDAY... * WHAT...Sub-freezing temperatures as low as 29 expected. * WHERE...Valleys of central Douglas County, including the cities of Roseburg, Sutherlin, Drain, Elkton, Green, Myrtle Creek, Canyonville, and Glendale. * WHEN...From 2 AM to 9 AM PDT Friday. * IMPACTS...Sub-freezing conditions could kill crops and other sensitive vegetation. * ADDITIONAL DETAILS...This is a cold air mass, but there may be enough of an inversion for wind machines to be effective in mixing somewhat warmer air aloft to the surface. * View the hazard area in detail at https://www.wrh.noaa.gov/map/?wfo=mfr PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ ORZ021-022-090000- /O.NEW.KMFR.FR.Y.0006.210409T0900Z-210409T1600Z/ South Central Oregon Coast-Curry County Coast- Including the cities of Coos Bay, North Bend, Reedsport, Bandon, and Coquille 511 AM PDT Thu Apr 8 2021 ...FROST ADVISORY IN EFFECT FROM 2 AM TO 9 AM PDT FRIDAY... * WHAT...Low temperatures of 33 to 36 degrees will result in frost formation. * WHERE...South Central Oregon Coast and Curry County Coast, including Coos Bay, North Bend, Reedsport, Bandon, Coquille and Myrtle Point. * WHEN...From 2 AM to 9 AM PDT Friday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. * 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. && $$ Visit us at https://www.weather.gov/Medford
2 follow-up statements
582 WWUS76 KMFR 082140 NPWMFR URGENT - WEATHER MESSAGE National Weather Service Medford OR 240 PM PDT Thu Apr 8 2021 ORZ024-026-091600- /O.NEW.KMFR.FZ.A.0003.210411T0900Z-210411T1600Z/ /O.CON.KMFR.FZ.W.0006.210409T0900Z-210409T1600Z/ Eastern Curry County and Josephine County-Jackson County- Including the cities of Grants Pass, Cave Junction, Medford, and Ashland 240 PM PDT Thu Apr 8 2021 ...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 9 AM PDT FRIDAY... ...FREEZE WATCH IN EFFECT FROM LATE SATURDAY NIGHT THROUGH SUNDAY MORNING... * WHAT...For the Freeze Warning, sub-freezing temperatures as low as 25 expected. For the Freeze Watch, sub-freezing temperatures as low as 23 possible. * WHERE...Valleys of Josephine and Jackson Counties, including Medford, Grants Pass, Ashland, Talent, Phoenix, Eagle Point, Shady Cove, Williams, Provolt, Merlin, Selma, Cave Junction, and O'Brien. * WHEN...For the Freeze Warning, from 2 AM to 9 AM PDT Friday. For the Freeze Watch, from late Saturday night through Sunday morning. * IMPACTS...Sub-freezing conditions could kill crops and other sensitive vegetation. * ADDITIONAL DETAILS...This is a cold air mass, but there may be enough of an inversion tonight for wind machines to be effective in mixing warmer air aloft to the surface. Any inversion on Saturday night will be weaker. * View the hazard area in detail at https://www.wrh.noaa.gov/map/?wfo=mfr PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. && $$ ORZ023-091600- /O.NEW.KMFR.FZ.A.0003.210411T0900Z-210411T1600Z/ /O.CON.KMFR.FZ.W.0006.210409T0900Z-210409T1600Z/ Central Douglas County- Including the cities of Drain, Elkton, Roseburg, Sutherlin, Green, Myrtle Creek, Canyonville, and Glendale 240 PM PDT Thu Apr 8 2021 ...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 9 AM PDT FRIDAY... ...FREEZE WATCH IN EFFECT FROM LATE SATURDAY NIGHT THROUGH SUNDAY MORNING... * WHAT...For the Freeze Warning, sub-freezing temperatures as low as 29 expected. For the Freeze Watch, sub-freezing temperatures as low as 27 possible. * WHERE...Valleys of central Douglas County, including the cities of Roseburg, Sutherlin, Drain, Elkton, Green, Myrtle Creek, Canyonville, and Glendale. * WHEN...For the Freeze Warning, from 2 AM to 9 AM PDT Friday. For the Freeze Watch, from late Saturday night through Sunday morning. * IMPACTS...Sub-freezing conditions could kill crops and other sensitive vegetation. * ADDITIONAL DETAILS...This is a cold air mass, but there may be enough of an inversion tonight for wind machines to be effective in mixing warmer air aloft to the surface. Any inversion on Saturday night will be weaker. * 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. && $$ ORZ021-022-091600- /O.CON.KMFR.FR.Y.0006.210409T0900Z-210409T1600Z/ South Central Oregon Coast-Curry County Coast- Including the cities of Coos Bay, North Bend, Reedsport, Bandon, and Coquille 240 PM PDT Thu Apr 8 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 2 AM TO 9 AM PDT FRIDAY... * WHAT...Low temperatures of 33 to 36 degrees will result in frost formation. * WHERE...South Central Oregon Coast and Curry County Coast, including Coos Bay, North Bend, Reedsport, Bandon, Coquille, and Myrtle Point. * WHEN...From 2 AM to 9 AM PDT Friday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. * View the hazard area in detail at https://www.wrh.noaa.gov/map/?wfo=mfr PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ Visit us at https://www.weather.gov/Medford
690 WWUS76 KMFR 091543 NPWMFR URGENT - WEATHER MESSAGE National Weather Service Medford OR 843 AM PDT Fri Apr 9 2021 ORZ024-026-092345- /O.EXP.KMFR.FZ.W.0006.000000T0000Z-210409T1600Z/ /O.CON.KMFR.FZ.A.0003.210411T0900Z-210411T1600Z/ Eastern Curry County and Josephine County-Jackson County- Including the cities of Grants Pass, Cave Junction, Medford, and Ashland 843 AM PDT Fri Apr 9 2021 ...FREEZE WATCH REMAINS IN EFFECT FROM LATE SATURDAY NIGHT THROUGH SUNDAY MORNING... ...FREEZE WARNING WILL EXPIRE AT 9 AM PDT THIS MORNING... * WHAT...Sub-freezing temperatures as low as 21 possible. * WHERE...Valleys of Josephine and Jackson Counties, including Medford, Grants Pass, Ashland, Talent, Phoenix, Eagle Point, Shady Cove, Williams, Provolt, Merlin, Selma, Cave Junction, and O'Brien. * WHEN...Late Saturday night through Sunday morning. * IMPACTS...Frost and freeze conditions could 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. && $$ ORZ023-092345- /O.EXP.KMFR.FZ.W.0006.000000T0000Z-210409T1600Z/ /O.CON.KMFR.FZ.A.0003.210411T0900Z-210411T1600Z/ Central Douglas County- Including the cities of Drain, Elkton, Roseburg, Sutherlin, Green, Myrtle Creek, Canyonville, and Glendale 843 AM PDT Fri Apr 9 2021 ...FREEZE WATCH REMAINS IN EFFECT FROM LATE SATURDAY NIGHT THROUGH SUNDAY MORNING... ...FREEZE WARNING WILL EXPIRE AT 9 AM PDT THIS MORNING... * WHAT...Sub-freezing temperatures as low as 26 possible. * WHERE...Valleys of central Douglas County, including the cities of Roseburg, Sutherlin, Drain, Elkton, Green, Myrtle Creek, Canyonville, and Glendale. * WHEN...Late Saturday night through Sunday morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. * View the hazard area in detail at https://www.wrh.noaa.gov/map/?wfo=mfr PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. && $$ ORZ021-022-091645- /O.EXP.KMFR.FR.Y.0006.000000T0000Z-210409T1600Z/ South Central Oregon Coast-Curry County Coast- Including the cities of Coos Bay, North Bend, Reedsport, Bandon, and Coquille 843 AM PDT Fri Apr 9 2021 ...FROST ADVISORY WILL EXPIRE AT 9 AM PDT THIS MORNING... Temperatures will continue rise above critical values this morning. However, another round of frost potential will be possible late Saturday night into Sunday morning. $$ 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 8, 1:55 AM PDT | Freeze Watch | MFR | Coos, Curry, Douglas, Jackson, Josephine | 3 hr |
| Apr 8, 5:11 AM PDT | Freeze Warning | MFR | Coos, Curry, Douglas, Jackson, Josephine | 28 hr |
| Apr 8, 2:40 PM PDT | Freeze Watch | MFR | Coos, Curry, Douglas, Jackson, Josephine | 36 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.