Alert archive / Oregon / Frost Advisories in 2021
Frost Advisory 8, NWS Medford, OR
NWS Medford, OR issued this frost advisory at Apr 11, 2021, 1:15 PM PDT for Coos County, Curry County, Douglas County, Oregon. It took effect at Apr 12, 2021, 2:00 AM PDT. It was in force for 7 hr.
The area
The counties it named.
The facts
- Issued
- Apr 11, 2021, 1:15 PM PDT (20:15 UTC)
- In effect from
- Apr 12, 2021, 2:00 AM PDT
- Expired
- Apr 12, 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 20:14 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, 8.3 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
- 822 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- -5 m²/s²
- 0-3 km storm-relative helicity
- 35 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
134 WWUS76 KMFR 112015 NPWMFR URGENT - WEATHER MESSAGE National Weather Service Medford OR 115 PM PDT Sun Apr 11 2021 ORZ021-121200- /O.NEW.KMFR.FR.Y.0008.210412T0900Z-210412T1600Z/ South Central Oregon Coast- Including the cities of Coos Bay, North Bend, Reedsport, and Coquille 115 PM PDT Sun Apr 11 2021 ...FROST ADVISORY IN EFFECT FROM 2 AM TO 9 AM PDT MONDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...South Central Oregon Coast, including the cities of Reedsport, Coos Bay, North Bend, Myrtle Point and Powers. * WHEN...From 2 AM to 9 AM PDT Monday. * IMPACTS...Frost could damage or 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. && $$ Visit us at https://www.weather.gov/Medford
2 follow-up statements
602 WWUS76 KMFR 121000 NPWMFR URGENT - WEATHER MESSAGE National Weather Service Medford OR 300 AM PDT Mon Apr 12 2021 ORZ021-121600- /O.CON.KMFR.FR.Y.0008.000000T0000Z-210412T1600Z/ South Central Oregon Coast- Including the cities of Coos Bay, North Bend, Reedsport, and Coquille 300 AM PDT Mon Apr 12 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...South Central Oregon Coast, including the cities of Reedsport, Coos Bay, North Bend, Myrtle Point and Powers. * WHEN...Until 9 AM PDT Monday. * IMPACTS...Frost could damage or kill sensitive outdoor vegetation if left uncovered. * View the hazard area in detail at https://www.wrh.noaa.gov/map/?wfo=mfr PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ Visit us at https://www.weather.gov/Medford
674 WWUS76 KMFR 121543 NPWMFR URGENT - WEATHER MESSAGE National Weather Service Medford OR 843 AM PDT Mon Apr 12 2021 ORZ021-121645- /O.EXP.KMFR.FR.Y.0008.000000T0000Z-210412T1600Z/ South Central Oregon Coast- Including the cities of Coos Bay, North Bend, Reedsport, and Coquille 843 AM PDT Mon Apr 12 2021 ...FROST ADVISORY WILL EXPIRE AT 9 AM PDT THIS MORNING... Temperatures will continue to rise above critical thresholds this morning. $$ Visit us at https://www.weather.gov/Medford
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.