Alert archive / California / Frost Advisories in 2017
Frost Advisory 13, NWS Medford, OR
NWS Medford, OR issued this frost advisory at Sep 20, 2017, 4:32 AM PDT for Modoc County, Siskiyou County, California. It took effect at Sep 21, 2017, 2:00 AM PDT. It was in force for 7 hr.
The area
The counties it named.
The facts
- Issued
- Sep 20, 2017, 4:32 AM PDT (11:32 UTC)
- In effect from
- Sep 21, 2017, 2:00 AM PDT
- Expired
- Sep 21, 2017, 9:00 AM PDT
- In force
- 7 hr
- Issued by
- NWS Medford, OR
Counties Modoc County, CA, Siskiyou County, CA
The radar
The Medford radar (KMAX), 105 km from the middle of the area, began a volume at 11:32 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, 11.5 hours before the alert went out and 130 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
- 16 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 1080 m above ground
- 0-6 km bulk shear
- 78 kt
- 0-1 km storm-relative helicity
- 201 m²/s²
- 0-3 km storm-relative helicity
- 257 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
509 WWUS76 KMFR 201132 NPWMFR URGENT - WEATHER MESSAGE National Weather Service Medford OR 432 AM PDT Wed Sep 20 2017 CAZ085-202345- /O.NEW.KMFR.FZ.W.0013.170921T0900Z-170921T1500Z/ /O.NEW.KMFR.FR.Y.0013.170921T0900Z-170921T1500Z/ /O.CON.KMFR.WI.Y.0031.170920T1300Z-170921T0000Z/ Modoc County- Including the cities of Alturas, Canby, and Likely 432 AM PDT Wed Sep 20 2017 ...WIND ADVISORY REMAINS IN EFFECT UNTIL 5 PM PDT THIS AFTERNOON... ...FREEZE WARNING IN EFFECT FROM 2 AM TO 8 AM PDT THURSDAY... ...FROST ADVISORY IN EFFECT FROM 2 AM TO 8 AM PDT THURSDAY... The National Weather Service in Medford has issued a Freeze Warning...which is in effect from 2 AM to 8 AM PDT Thursday. A Frost Advisory has also been issued. This Frost Advisory is in effect from 2 AM to 8 AM PDT Thursday. * Winds...West 25 to 35 mph with gusts of 45 to 55 mph. * Timing...Winds will peak this morning into early this afternoon then gradually lower late this afternoon. * Temperature...lowering to 32 to 35 degrees late tonight and early Thursday morning. * Locations for the wind advisory include...Higher terrain in Lake and eastern Modoc counties, including Summer Ridge, the Hart Mountains and the Warner Mountains. This also includes Cedar Pass along Highway 299 in eastern Modoc County and portions of Highway 140 east of Lakeview. * Wind Impacts...Travel will become difficult for lightweight and high profile vehicles. Loose objects may be blown around or lost. * Locations for the freeze warning include...outlying areas in Modoc county including Davis Creek and the higher terrain. * Locations for the frost advisory include...Alturas...Adin... Likely...Canby and Newell. * Temperature impacts...Sensitive vegetation may be killed or damaged if left unprotected. * View the hazard area in detail at https://www.wrh.noaa.gov/mfr/HAZARD Precautionary/preparedness actions... A Wind Advisory means that winds of 35 mph are expected with higher gusts possible. Winds this strong can make driving difficult, especially for high profile vehicles. Use extra caution. A Freeze Warning means sub-freezing temperatures are imminent or highly likely. These conditions will kill crops and other sensitive vegetation. A Frost Advisory means that widespread frost is expected. Sensitive outdoor plants may be killed if left uncovered. && $$ CAZ084-202345- /O.NEW.KMFR.FZ.W.0013.170921T0900Z-170921T1500Z/ /O.NEW.KMFR.FR.Y.0013.170921T0900Z-170921T1500Z/ Northeast Siskiyou and Northwest Modoc Counties- Including the cities of Tulelake and Dorris 432 AM PDT Wed Sep 20 2017 ...FREEZE WARNING IN EFFECT FROM 2 AM TO 8 AM PDT THURSDAY... ...FROST ADVISORY IN EFFECT FROM 2 AM TO 8 AM PDT THURSDAY... The National Weather Service in Medford has issued a Freeze Warning...which is in effect from 2 AM to 8 AM PDT Thursday. A Frost Advisory has also been issued. This Frost Advisory is in effect from 2 AM to 8 AM PDT Thursday. * Temperature...lowering to 31 to 34 degrees late tonight and early Thursday morning. * Locations for the freeze warning include...Dorris and Tulelake * Locations for the frost advisory include...MacDoel. * Impacts...Sensitive vegetation may be killed or damaged if left unprotected. * View the hazard area in detail at https://www.wrh.noaa.gov/mfr/HAZARD Precautionary/preparedness actions... A Freeze Warning means sub-freezing temperatures are imminent or highly likely. These conditions will kill crops and other sensitive vegetation. A Frost Advisory means that widespread frost is expected. Sensitive outdoor plants may be killed if left uncovered. && $$ ORZ030-031-202345- /O.NEW.KMFR.FZ.W.0013.170921T0900Z-170921T1500Z/ /O.CON.KMFR.WI.Y.0031.170920T1300Z-170921T0000Z/ Northern and Eastern Klamath County and Western Lake County- Central and Eastern Lake County- Including the cities of Beatty, Bly, Chemult, Crescent, Gilchrist, Sprague River, Adel, Lakeview, and Valley Falls 432 AM PDT Wed Sep 20 2017 ...WIND ADVISORY REMAINS IN EFFECT UNTIL 5 PM PDT THIS AFTERNOON... ...FREEZE WARNING IN EFFECT FROM 2 AM TO 8 AM PDT THURSDAY... The National Weather Service in Medford has issued a Freeze Warning...which is in effect from 2 AM to 8 AM PDT Thursday. * Winds...West 25 to 35 mph with gusts of 45 to 55 mph. * Timing...Winds will peak this morning into early this afternoon then gradually lower late this afternoon. * Temperature...lowering to 28 to 32 degrees late tonight and early Thursday morning. * Locations for the wind advisory include...Higher terrain in Lake and eastern Modoc counties, including Summer Ridge, the Hart Mountains and the Warner Mountains. This also includes Cedar Pass along Highway 299 in eastern Modoc County and portions of Highway 140 east of Lakeview. * Wind Impacts...Travel will become difficult for lightweight and high profile vehicles. Loose objects may be blown around or lost. * Locations for the freeze warning include...all areas in Klamath and Lake counties, including Lakeview, Silver Lake, Sprague River and Chemult. * Temperature impacts...Sensitive vegetation may be killed or damaged if left unprotected. * View the hazard area in detail at https://www.wrh.noaa.gov/mfr/HAZARD Precautionary/preparedness actions... A Wind Advisory means that winds of 35 mph are expected with higher gusts possible. Winds this strong can make driving difficult, especially for high profile vehicles. Use extra caution. A Freeze Warning means sub-freezing temperatures are imminent or highly likely. These conditions will kill crops and other sensitive vegetation. && $$ ORZ029-202345- /O.NEW.KMFR.FZ.W.0013.170921T0900Z-170921T1500Z/ Klamath Basin- Including the cities of Altamont and Klamath Falls 432 AM PDT Wed Sep 20 2017 ...FREEZE WARNING IN EFFECT FROM 2 AM TO 8 AM PDT THURSDAY... The National Weather Service in Medford has issued a Freeze Warning...which is in effect from 2 AM to 8 AM PDT Thursday. * Temperature...lowering to 30 to 32 degrees late tonight and early Thursday morning. * Locations include...all areas in Klamath County, including Klamath Falls, Keno, Merrill and Chiloquin. * Impacts...Sensitive vegetation may be killed or damaged if left unprotected. * View the hazard area in detail at https://www.wrh.noaa.gov/mfr/HAZARD Precautionary/preparedness actions... A Freeze Warning means sub-freezing temperatures are imminent or highly likely. These conditions will kill crops and other sensitive vegetation. && $$
4 follow-up statements
638 WWUS76 KMFR 202132 NPWMFR URGENT - WEATHER MESSAGE National Weather Service Medford OR 232 PM PDT Wed Sep 20 2017 CAZ085-210945- /O.NEW.KMFR.FZ.W.0014.170922T0900Z-170922T1600Z/ /O.NEW.KMFR.FR.Y.0014.170922T0900Z-170922T1600Z/ /O.CON.KMFR.FZ.W.0013.170921T0900Z-170921T1500Z/ /O.CON.KMFR.WI.Y.0031.000000T0000Z-170921T0000Z/ /O.CON.KMFR.FR.Y.0013.170921T0900Z-170921T1500Z/ Modoc County- Including the cities of Alturas, Canby, and Likely 232 PM PDT Wed Sep 20 2017 ...WIND ADVISORY REMAINS IN EFFECT UNTIL 5 PM PDT THIS AFTERNOON... ...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 8 AM PDT THURSDAY... ...FROST ADVISORY REMAINS IN EFFECT FROM 2 AM TO 8 AM PDT THURSDAY... ...FREEZE WARNING IN EFFECT FROM 2 AM TO 9 AM PDT FRIDAY... ...FROST ADVISORY IN EFFECT FROM 2 AM TO 9 AM PDT FRIDAY... The National Weather Service in Medford has issued a Freeze Warning...which is in effect from 2 AM to 9 AM PDT Friday. A Frost Advisory has also been issued. This Frost Advisory is in effect from 2 AM to 9 AM PDT Friday. * Winds...West 25 to 35 mph with gusts of 45 to 55 mph. * Timing...Winds will peak this morning into early this afternoon then gradually lower late this afternoon. * Temperature...lowering to 32 to 35 degrees late tonight and early Thursday morning. * Locations for the wind advisory include...Higher terrain in Lake and eastern Modoc counties, including Summer Ridge, the Hart Mountains and the Warner Mountains. This also includes Cedar Pass along Highway 299 in eastern Modoc County and portions of Highway 140 east of Lakeview. * Wind Impacts...Travel will become difficult for lightweight and high profile vehicles. Loose objects may be blown around or lost. * Locations for the freeze warnings include...Newell and Alturas. * Locations for the frost advisory include...central Modoc County, areas north and west of Alturas, Canby, Willow Ranch and Davis Creek. * Temperature impacts...Sensitive vegetation may be killed or damaged if left unprotected. * View the hazard area in detail at https://www.wrh.noaa.gov/mfr/HAZARD Precautionary/preparedness actions... A Wind Advisory means that winds of 35 mph are expected with higher gusts possible. Winds this strong can make driving difficult, especially for high profile vehicles. Use extra caution. A Freeze Warning means sub-freezing temperatures are imminent or highly likely. These conditions will kill crops and other sensitive vegetation. A Frost Advisory means that widespread frost is expected. Sensitive outdoor plants may be killed if left uncovered. && $$ CAZ084-210945- /O.NEW.KMFR.FZ.W.0014.170922T0900Z-170922T1600Z/ /O.NEW.KMFR.FR.Y.0014.170922T0900Z-170922T1600Z/ /O.CON.KMFR.FZ.W.0013.170921T0900Z-170921T1500Z/ /O.CON.KMFR.FR.Y.0013.170921T0900Z-170921T1500Z/ Northeast Siskiyou and Northwest Modoc Counties- Including the cities of Tulelake and Dorris 232 PM PDT Wed Sep 20 2017 ...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 8 AM PDT THURSDAY... ...FROST ADVISORY REMAINS IN EFFECT FROM 2 AM TO 8 AM PDT THURSDAY... ...FREEZE WARNING IN EFFECT FROM 2 AM TO 9 AM PDT FRIDAY... ...FROST ADVISORY IN EFFECT FROM 2 AM TO 9 AM PDT FRIDAY... The National Weather Service in Medford has issued a Freeze Warning...which is in effect from 2 AM to 9 AM PDT Friday. A Frost Advisory has also been issued. This Frost Advisory is in effect from 2 AM to 9 AM PDT Friday. * Temperature...lowering to 31 to 34 degrees late tonight and early Thursday morning. * Locations for the freeze warnings include...Dorris, Tulelake and MacDoel * Locations for the frost advisory include...Lava Beds National Monument. * Impacts...Sensitive vegetation may be killed or damaged if left unprotected. * View the hazard area in detail at https://www.wrh.noaa.gov/mfr/HAZARD Precautionary/preparedness actions... A Freeze Warning means sub-freezing temperatures are imminent or highly likely. These conditions will kill crops and other sensitive vegetation. A Frost Advisory means that widespread frost is expected. Sensitive outdoor plants may be killed if left uncovered. && $$ ORZ030-031-210945- /O.NEW.KMFR.FZ.W.0014.170922T0900Z-170922T1600Z/ /O.NEW.KMFR.FR.Y.0014.170922T0900Z-170922T1600Z/ /O.CON.KMFR.FZ.W.0013.170921T0900Z-170921T1500Z/ /O.CON.KMFR.WI.Y.0031.000000T0000Z-170921T0000Z/ Northern and Eastern Klamath County and Western Lake County- Central and Eastern Lake County- Including the cities of Beatty, Bly, Chemult, Crescent, Gilchrist, Sprague River, Adel, Lakeview, and Valley Falls 232 PM PDT Wed Sep 20 2017 ...WIND ADVISORY REMAINS IN EFFECT UNTIL 5 PM PDT THIS AFTERNOON... ...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 8 AM PDT THURSDAY... ...FREEZE WARNING IN EFFECT FROM 2 AM TO 9 AM PDT FRIDAY... ...FROST ADVISORY IN EFFECT FROM 2 AM TO 9 AM PDT FRIDAY... The National Weather Service in Medford has issued a Freeze Warning...which is in effect from 2 AM to 9 AM PDT Friday. A Frost Advisory has also been issued. This Frost Advisory is in effect from 2 AM to 9 AM PDT Friday. * Winds...West 25 to 35 mph with gusts of 45 to 55 mph. * Timing...Winds will peak this morning into early this afternoon then gradually lower late this afternoon. * Temperature...lowering to 28 to 32 degrees late tonight and early Thursday morning. * Locations for the wind advisory include...Higher terrain in Lake and eastern Modoc counties, including Summer Ridge, the Hart Mountains and the Warner Mountains. This also includes Cedar Pass along Highway 299 in eastern Modoc County and portions of Highway 140 east of Lakeview. * Wind Impacts...Travel will become difficult for lightweight and high profile vehicles. Loose objects may be blown around or lost. * Locations for the freeze warnings include...Lakeview, Silver Lake, Sprague River, Bonanza and Chemult. * Locations in the frost advisory Friday include...Paisley and Summer Lake. * Temperature impacts...Sensitive vegetation may be killed or damaged if left unprotected. * View the hazard area in detail at https://www.wrh.noaa.gov/mfr/HAZARD Precautionary/preparedness actions... A Wind Advisory means that winds of 35 mph are expected with higher gusts possible. Winds this strong can make driving difficult, especially for high profile vehicles. Use extra caution. A Freeze Warning means sub-freezing temperatures are imminent or highly likely. These conditions will kill crops and other sensitive vegetation. A Frost Advisory means that widespread frost is expected. Sensitive outdoor plants may be killed if left uncovered. && $$ ORZ029-210945- /O.NEW.KMFR.FZ.W.0014.170922T0900Z-170922T1600Z/ /O.NEW.KMFR.FR.Y.0014.170922T0900Z-170922T1600Z/ /O.CON.KMFR.FZ.W.0013.170921T0900Z-170921T1500Z/ Klamath Basin- Including the cities of Altamont and Klamath Falls 232 PM PDT Wed Sep 20 2017 ...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 8 AM PDT THURSDAY... ...FREEZE WARNING IN EFFECT FROM 2 AM TO 9 AM PDT FRIDAY... ...FROST ADVISORY IN EFFECT FROM 2 AM TO 9 AM PDT FRIDAY... The National Weather Service in Medford has issued a Freeze Warning...which is in effect from 2 AM to 9 AM PDT Friday. A Frost Advisory has also been issued. This Frost Advisory is in effect from 2 AM to 9 AM PDT Friday. * Temperature...lowering to 30 to 32 degrees late tonight and early Thursday morning. * Locations in the warnings include...Klamath Falls, Merrill and Chiloquin. * Locations in the advisory Friday include...Keno and Modoc Point. * Impacts...Sensitive vegetation may be killed or damaged if left unprotected. * View the hazard area in detail at https://www.wrh.noaa.gov/mfr/HAZARD Precautionary/preparedness actions... A Freeze Warning means sub-freezing temperatures are imminent or highly likely. These conditions will kill crops and other sensitive vegetation. A Frost Advisory means that widespread frost is expected. Sensitive outdoor plants may be killed if left uncovered. && $$
727 WWUS76 KMFR 210017 NPWMFR URGENT - WEATHER MESSAGE National Weather Service Medford OR 517 PM PDT Wed Sep 20 2017 CAZ085-211230- /O.EXP.KMFR.WI.Y.0031.000000T0000Z-170921T0000Z/ /O.CON.KMFR.FZ.W.0013.170921T0900Z-170921T1500Z/ /O.CON.KMFR.FZ.W.0014.170922T0900Z-170922T1600Z/ /O.CON.KMFR.FR.Y.0013.170921T0900Z-170921T1500Z/ /O.CON.KMFR.FR.Y.0014.170922T0900Z-170922T1600Z/ Modoc County- Including the cities of Alturas, Canby, and Likely 517 PM PDT Wed Sep 20 2017 ...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 8 AM PDT THURSDAY... ...FROST ADVISORY REMAINS IN EFFECT FROM 2 AM TO 8 AM PDT THURSDAY... ...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 9 AM PDT FRIDAY... ...FROST ADVISORY REMAINS IN EFFECT FROM 2 AM TO 9 AM PDT FRIDAY... ...WIND ADVISORY HAS EXPIRED... * Temperature...lowering to 32 to 35 degrees late tonight and early Thursday morning. * Locations for the freeze warnings include...Newell and Alturas. * Locations for the frost advisory include...central Modoc County, areas north and west of Alturas, Canby, Willow Ranch and Davis Creek. * Temperature impacts...Sensitive vegetation may be killed or damaged if left unprotected. * View the hazard area in detail at https://www.wrh.noaa.gov/mfr/HAZARD Precautionary/preparedness actions... A Freeze Warning means sub-freezing temperatures are imminent or highly likely. These conditions will kill crops and other sensitive vegetation. A Frost Advisory means that widespread frost is expected. Sensitive outdoor plants may be killed if left uncovered. && $$ ORZ030-031-211230- /O.EXP.KMFR.WI.Y.0031.000000T0000Z-170921T0000Z/ /O.CON.KMFR.FZ.W.0013.170921T0900Z-170921T1500Z/ /O.CON.KMFR.FZ.W.0014.170922T0900Z-170922T1600Z/ /O.CON.KMFR.FR.Y.0014.170922T0900Z-170922T1600Z/ Northern and Eastern Klamath County and Western Lake County- Central and Eastern Lake County- Including the cities of Beatty, Bly, Chemult, Crescent, Gilchrist, Sprague River, Adel, Lakeview, and Valley Falls 517 PM PDT Wed Sep 20 2017 ...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 8 AM PDT THURSDAY... ...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 9 AM PDT FRIDAY... ...FROST ADVISORY REMAINS IN EFFECT FROM 2 AM TO 9 AM PDT FRIDAY... ...WIND ADVISORY HAS EXPIRED... * Temperature...lowering to 28 to 32 degrees late tonight and early Thursday morning. * Locations for the freeze warnings include...Lakeview, Silver Lake, Sprague River, Bonanza and Chemult. * Locations in the frost advisory Friday include...Paisley and Summer Lake. * Temperature impacts...Sensitive vegetation may be killed or damaged if left unprotected. * View the hazard area in detail at https://www.wrh.noaa.gov/mfr/HAZARD Precautionary/preparedness actions... A Freeze Warning means sub-freezing temperatures are imminent or highly likely. These conditions will kill crops and other sensitive vegetation. A Frost Advisory means that widespread frost is expected. Sensitive outdoor plants may be killed if left uncovered. && $$ CAZ084-211230- /O.CON.KMFR.FZ.W.0013.170921T0900Z-170921T1500Z/ /O.CON.KMFR.FZ.W.0014.170922T0900Z-170922T1600Z/ /O.CON.KMFR.FR.Y.0013.170921T0900Z-170921T1500Z/ /O.CON.KMFR.FR.Y.0014.170922T0900Z-170922T1600Z/ Northeast Siskiyou and Northwest Modoc Counties- Including the cities of Tulelake and Dorris 517 PM PDT Wed Sep 20 2017 ...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 8 AM PDT THURSDAY... ...FROST ADVISORY REMAINS IN EFFECT FROM 2 AM TO 8 AM PDT THURSDAY... ...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 9 AM PDT FRIDAY... ...FROST ADVISORY REMAINS IN EFFECT FROM 2 AM TO 9 AM PDT FRIDAY... * Temperature...lowering to 31 to 34 degrees late tonight and early Thursday morning. * Locations for the freeze warnings include...Dorris, Tulelake and MacDoel * Locations for the frost advisory include...Lava Beds National Monument. * Impacts...Sensitive vegetation may be killed or damaged if left unprotected. * View the hazard area in detail at https://www.wrh.noaa.gov/mfr/HAZARD Precautionary/preparedness actions... A Freeze Warning means sub-freezing temperatures are imminent or highly likely. These conditions will kill crops and other sensitive vegetation. A Frost Advisory means that widespread frost is expected. Sensitive outdoor plants may be killed if left uncovered. && $$ ORZ029-211230- /O.CON.KMFR.FZ.W.0013.170921T0900Z-170921T1500Z/ /O.CON.KMFR.FZ.W.0014.170922T0900Z-170922T1600Z/ /O.CON.KMFR.FR.Y.0014.170922T0900Z-170922T1600Z/ Klamath Basin- Including the cities of Altamont and Klamath Falls 517 PM PDT Wed Sep 20 2017 ...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 8 AM PDT THURSDAY... ...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 9 AM PDT FRIDAY... ...FROST ADVISORY REMAINS IN EFFECT FROM 2 AM TO 9 AM PDT FRIDAY... * Temperature...lowering to 30 to 32 degrees late tonight and early Thursday morning. * Locations in the warnings include...Klamath Falls, Merrill and Chiloquin. * Locations in the advisory Friday include...Keno and Modoc Point. * Impacts...Sensitive vegetation may be killed or damaged if left unprotected. * View the hazard area in detail at https://www.wrh.noaa.gov/mfr/HAZARD Precautionary/preparedness actions... A Freeze Warning means sub-freezing temperatures are imminent or highly likely. These conditions will kill crops and other sensitive vegetation. A Frost Advisory means that widespread frost is expected. Sensitive outdoor plants may be killed if left uncovered. && $$
596 WWUS76 KMFR 210951 NPWMFR URGENT - WEATHER MESSAGE National Weather Service Medford OR 251 AM PDT Thu Sep 21 2017 CAZ084-085-212300- /O.EXT.KMFR.FZ.W.0013.000000T0000Z-170921T1600Z/ /O.EXT.KMFR.FR.Y.0013.000000T0000Z-170921T1600Z/ /O.CON.KMFR.FZ.W.0014.170922T0900Z-170922T1600Z/ /O.CON.KMFR.FR.Y.0014.170922T0900Z-170922T1600Z/ Northeast Siskiyou and Northwest Modoc Counties-Modoc County- Including the cities of Tulelake, Dorris, Alturas, Canby, and Likely 251 AM PDT Thu Sep 21 2017 ...FREEZE WARNING NOW IN EFFECT UNTIL 9 AM PDT THIS MORNING... ...FROST ADVISORY NOW IN EFFECT UNTIL 9 AM PDT THIS MORNING... ...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 9 AM PDT FRIDAY... ...FROST ADVISORY REMAINS IN EFFECT FROM 2 AM TO 9 AM PDT FRIDAY... * Temperature...lowering to 30 to 34 degrees early this morning. Additional low temperatures in the lower 30s are expected Friday morning. * Locations for the freeze warnings include...Dorris, Tulelake and MacDoel and Alturas. * Locations for the frost advisory include...Canby, Adin and Lava Beds National Monument. * Impacts...Sensitive vegetation may be killed or damaged if left unprotected. * View the hazard area in detail at https://www.wrh.noaa.gov/mfr/HAZARD Precautionary/preparedness actions... A Freeze Warning means sub-freezing temperatures are imminent or highly likely. These conditions will kill crops and other sensitive vegetation. A Frost Advisory means that widespread frost is expected. Sensitive outdoor plants may be killed if left uncovered. && $$ ORZ029>031-212300- /O.EXT.KMFR.FZ.W.0013.000000T0000Z-170921T1600Z/ /O.CON.KMFR.FZ.W.0014.170922T0900Z-170922T1600Z/ /O.CON.KMFR.FR.Y.0014.170922T0900Z-170922T1600Z/ Klamath Basin- Northern and Eastern Klamath County and Western Lake County- Central and Eastern Lake County- Including the cities of Altamont, Klamath Falls, Beatty, Bly, Chemult, Crescent, Gilchrist, Sprague River, Adel, Lakeview, and Valley Falls 251 AM PDT Thu Sep 21 2017 ...FREEZE WARNING NOW IN EFFECT UNTIL 9 AM PDT THIS MORNING... ...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 9 AM PDT FRIDAY... ...FROST ADVISORY REMAINS IN EFFECT FROM 2 AM TO 9 AM PDT FRIDAY... * Temperature...lowering to 30 to 32 degrees early this morning. Additional low temperatures in the lower 30s are expected Friday morning. * Locations in the warnings include...Klamath Falls, Merrill, Chiloquin, Sprague River, Chemult, Lakeview and Valley Falls. * Locations in the advisory Friday include...Keno and Worden. * Impacts...Sensitive vegetation may be killed or damaged if left unprotected. * View the hazard area in detail at https://www.wrh.noaa.gov/mfr/HAZARD Precautionary/preparedness actions... A Freeze Warning means sub-freezing temperatures are imminent or highly likely. These conditions will kill crops and other sensitive vegetation. A Frost Advisory means that widespread frost is expected. Sensitive outdoor plants may be killed if left uncovered. && $$ CC
739 WWUS76 KMFR 211607 NPWMFR URGENT - WEATHER MESSAGE National Weather Service Medford OR 907 AM PDT Thu Sep 21 2017 CAZ084-085-221200- /O.EXP.KMFR.FZ.W.0013.000000T0000Z-170921T1600Z/ /O.EXP.KMFR.FR.Y.0013.000000T0000Z-170921T1600Z/ /O.CON.KMFR.FZ.W.0014.170922T0900Z-170922T1600Z/ /O.CON.KMFR.FR.Y.0014.170922T0900Z-170922T1600Z/ Northeast Siskiyou and Northwest Modoc Counties-Modoc County- Including the cities of Tulelake, Dorris, Alturas, Canby, and Likely 907 AM PDT Thu Sep 21 2017 ...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 9 AM PDT FRIDAY... ...FROST ADVISORY REMAINS IN EFFECT FROM 2 AM TO 9 AM PDT FRIDAY... ...FREEZE WARNING HAS EXPIRED... ...FROST ADVISORY HAS EXPIRED... * Temperature...The upper 20s to lower 30s are expected late tonight into Friday morning. * Locations for the freeze warnings include...Dorris, Tulelake and MacDoel and Alturas. * Locations for the frost advisory include...Canby, Adin and Lava Beds National Monument. * Impacts...Sensitive vegetation may be killed or damaged if left unprotected. * View the hazard area in detail at https://www.wrh.noaa.gov/mfr/HAZARD Precautionary/preparedness actions... A Freeze Warning means sub-freezing temperatures are imminent or highly likely. These conditions will kill crops and other sensitive vegetation. A Frost Advisory means that widespread frost is expected. Sensitive outdoor plants may be killed if left uncovered. && $$ ORZ029>031-221200- /O.EXP.KMFR.FZ.W.0013.000000T0000Z-170921T1600Z/ /O.CON.KMFR.FZ.W.0014.170922T0900Z-170922T1600Z/ /O.CON.KMFR.FR.Y.0014.170922T0900Z-170922T1600Z/ Klamath Basin- Northern and Eastern Klamath County and Western Lake County- Central and Eastern Lake County- Including the cities of Altamont, Klamath Falls, Beatty, Bly, Chemult, Crescent, Gilchrist, Sprague River, Adel, Lakeview, and Valley Falls 907 AM PDT Thu Sep 21 2017 ...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 9 AM PDT FRIDAY... ...FROST ADVISORY REMAINS IN EFFECT FROM 2 AM TO 9 AM PDT FRIDAY... ...FREEZE WARNING HAS EXPIRED... * Temperature...The upper 20s to lower 30s are expected late tonight into Friday morning. * Locations in the warnings include...Klamath Falls, Merrill, Chiloquin, Sprague River, Chemult, Lakeview and Valley Falls. * Locations in the advisory include...Keno and Worden. * Impacts...Sensitive vegetation may be killed or damaged if left unprotected. * View the hazard area in detail at https://www.wrh.noaa.gov/mfr/HAZARD Precautionary/preparedness actions... A Freeze Warning means sub-freezing temperatures are imminent or highly likely. These conditions will kill crops and other sensitive vegetation. A Frost Advisory means that widespread frost is expected. Sensitive outdoor plants may be killed if left uncovered. && $$ Petrucelli
What forecasters said that day
The local office's own words before this frost 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 frost advisory went out at Sep 19, 9:14 PM PDT, 7 hours 18 minutes earlier.
Area forecast discussion, Sep 19, 9:14 PM PDT, 7 hours 18 minutes before
Area Forecast Discussion
National Weather Service Medford OR
914 PM PDT Tue Sep 19 2017
.DISCUSSION...An update to the forecast is not necessary. A flash
flood watch remains in effect through Wednesday morning for areas
including the Chetco Bar wildfire in Curry County into far western
Josephine County and highway 138 adjacent to the Umpqua North
Complex wildfire. A shortwave trough will bring enhanced rainfall
amounts during the remainder of tonight to the coastal range of
southern Oregon and into western Siskiyou County as well as the
southern Oregon Cascades. A cold front will follow to the coast
around 4 AM then inland through the morning with another episode
of enhanced rainfall. Rainfall amounts will be highest on west
facing slopes with snow levels falling from around 8000 feet to
around 5500 feet in the morning. There is also a slight chance of
thunderstorms both with and behind the cold frontal passage at the
coast and north of the Umpqua Divide from mid-morning into
Wednesday evening. Additional showers Wednesday afternoon into
Thursday will not be as numerous as the activity now through
Wednesday morning. The latest model data supports the forecast of
a warmer high temperatures with a drying airmass this weekend
through next week.
&&
.MARINE...Updated 830 PM PDT Tuesday 19 September 2017... A cold
front is expected to push into the marine waters later tonight and
south winds will increase as a result. However, these winds are
expected to stay within Small Craft Advisory thresholds. Steep
northwest swell will also continue to impact the area tonight as the
low pressure system in the Gulf of Alaska slides down into our
region. We can expect these steep northwest seas to continue into
Wednesday before the swell heights start to decrease late Wednesday
into early Thursday.
Eventually, high pressure will develop and a thermal trough will
position itself along the coast and south of Cape Blanco. We are
getting into that time of year when the temperature difference
between land and water is not going to be that great, so winds
associated with this thermal trough will be small craft advisory at
best. -Smith/DW
&&
.PREV DISCUSSION... /Issued 529 PM PDT Tue Sep 19 2017/
DISCUSSION...Cool and unsettled weather will continue through at
least Thursday. The weather will begin to dry out Friday, then we
could be looking at dry and warmer weather this weekend through
at least the middle of next week.
Were at a relative break in shower activity. The latest visible image
shows the leading edge of a warm front approaching the Oregon coast.
Steady precipitation is expected to arrive in southwest Oregon early
this evening and move inland tonight. This are could get some
significant rainfall and the concern is still there for possible
flooding. Therefore a flash flood watch remains in effect. Details on
this can be found at FFAMFR.
At the same time a strong upper trough for this time of the year
will push south tonight through Wednesday. There will be plenty of
energy, so expect moderate to heavy precipitation along the coast,
coastal mountains and Cascades. These areas could pick up between
1.50 and 2.00 inches of precipitation from this evening through
Wednesday evening. Even some westside valley locations could pick up
0.25 to 0.50 of an inch or more rainfall during the same time
period. Snow levels will be higher compared to last night, so were
not expecting any accumulations in places they did last night/early
this morning.
The above mentioned upper trough will bring in a colder air mass
aloft and snow levels could lower enough for wet snow to accumulate
near Diamond Lake, Crater Lake Park Entrance up to the Rim and Mount
Ashland Ski area, especially in the presence of heavier showers
Wednesday afternoon, but there's a better chance for snow to stick
there after dark Wednesday as road temperatures begin to lose
surface heating. Right now, snow levels are expected to be around
6,000 feet Wednesday, but could briefly lower to around 5500 feet in
heavier showers. So while it may be snowing at these levels,
accumulating snow should be higher up in elevation due to the warm
ground and roads. Snow levels could lower to near 5000 feet
Wednesday night with 1-2 inches of wet slushy snow is possible near
Diamond lake and 2-4 near Crater Lake and Mount Ashland Ski area, so
anyone planing on traveling in these areas should be prepared for
winter like conditions.
In addition 500mb temperatures between -25 and -26 C will move
overhead Wednesday afternoon over the marine waters and portions of
Douglas County during the time of max heating, therefore could not
rule out a slight chance of thunderstorms Wednesday afternoon into
early Wednesday evening.
There is less confidence in the weather for Thursday. In general,
the models show different solutions with the locations of
precipitation. For example, a couple of solutions show another
disturbance moving south along the Oregon coast which if correct
would bring little in the way of precipitation. However one model
solution brings the disturbance further inland resulting in a
greater chance for showers over a good portion of the area. This was
pretty much the case yesterday, so we'll continue to lean towards
the drier GFS and ECMWF solution, but further adjustments may be
necessary.
Precipitation will not be the only impact. Moderate to strong winds
are also possible along and east of the Cascades into early this
evening and again Wednesday afternoon and early evening. Right now,
were not expecting winds to reach any criteria, but it's something
we'll have monitor.
Friday will be a transition day as the upper trough shifts east
with a dry northerly flow. Still could not rule out a few showers
along the northern Cascades and eastside, but they should be the
exception. Dry and warmer weather returns next weekend as an upper
ridge builds over the eastern Pacific. At the surface, a thermal
trough will develop with increasing offshore flow in southeast
Oregon and Western Siksyou County. There is increasing confidence we
could remain in a prolonged period dry and warmer weather for most
of next week and beyond, but this is not a slam dunk. -Petrucelli
AVIATION...20/00Z TAF CYCLE...A mix of MVFR/VFR ceilings are
expected area wide tonight into Tuesday morning with terrain
obscured. As for the coast and TAF site KOTH, we'll probably see
CIGS fall down to IFR conditions before 12z. With a cold front
approaching around 12z, CIGS will will likely lift after frontal
passage and push CIGS into MVFR limits. As for the inland valleys
and east of the Cascades. VFR will dominate the forecast but MVFR
conditions are possible at times. -Smith
FIRE WEATHER...Updated 130 PM PDT Tuesday, 19 September
2017...The focus in the near-term is safety as the landscape
becomes quite cold, wet, and windy.
Breezy to windy conditions will affect most of the forecast area
through Wednesday, with strongest winds east of the Cascades and in
the highest terrain. Any weakened trees from wildfire will be
susceptible to falling due to the strong winds in the highest
terrain, especially where some wet snowfall weighs them down.
Snowfall will impact primarily areas above 6000 ft with several
inches accumulation possible.
Moderate to occasionally heavy rain could cause debris flows and/or
wash out rural forest roads, especially in the Coast Range on the
Chetco Bar wildfire burn scar late this afternoon into Wednesday
morning.
Warming and drying is expected beginning Friday. We are expecting
broad northeast to east flow over the weekend, and afternoon
humidity will likely lower into the 20s and 30s across the forecast
area. Model trends are suggesting a dry and warm period that lasts
through next weekend. Additionally, the Climate Prediction Center's
8-14 day outlook is calling for enhanced chances for above normal
temperatures and below normal precipitation. In short, this wet and
cool period will likely be followed by a steady and long-duration
warming and drying trend. -Keene
&&
.MFR WATCHES/WARNINGS/ADVISORIES...
OR...Flash Flood Watch through Wednesday morning for ORZ022-024.
Flash Flood Watch through Wednesday afternoon for ORZ025.
CA...None.
Pacific Coastal Waters...Small Craft Advisory until 5 AM PDT
Thursday for PZZ350-356-370-376.
DW/MAP/CZSThe office that day
Everything else NWS Medford, OR issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 20, 3:54 AM PDT | Wind Advisory | MFR | Modoc | 13 hr |
| Sep 20, 4:32 AM PDT | Freeze Warning | MFR | Modoc, Siskiyou | 28 hr |
| Sep 20, 2:32 PM PDT | Frost Advisory | MFR | Modoc, Siskiyou | 42 hr |
| Sep 20, 2:32 PM PDT | Freeze Warning | MFR | Modoc, Siskiyou | 42 hr |
Nearby
Frost Advisories in California, 2017Every frost advisory in 2017
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.