Alert archive / Oregon / Frost Advisories in 2009
Frost Advisory 21, NWS Medford, OR
NWS Medford, OR issued this frost advisory at Apr 4, 2009, 2:52 PM PDT for 5 counties in Oregon. It took effect at Apr 5, 2009, 2:00 AM PDT. It was in force for 6 hr.
The area
The counties it named.
The facts
- Issued
- Apr 4, 2009, 2:52 PM PDT (21:52 UTC)
- In effect from
- Apr 5, 2009, 2:00 AM PDT
- Expired
- Apr 5, 2009, 8:29 AM PDT
- In force
- 6 hr
- Issued by
- NWS Medford, OR
Counties Coos County, OR, Curry County, OR, Douglas County, OR, Jackson County, OR, Josephine County, OR
The radar
The Medford radar (KMAX), 101 km from the middle of the area, began a volume at 21:52 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, 9.9 hours before the alert went out and 75 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
- 738 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- -98 m²/s²
- 0-3 km storm-relative helicity
- 15 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WWUS76 KMFR 042152 NPWMFR URGENT - WEATHER MESSAGE NATIONAL WEATHER SERVICE MEDFORD OR 252 PM PDT SAT APR 4 2009 ...FROST EXPECTED TONIGHT... .CLEAR SKIES AND A DRYING ATMOSPHERE WILL CREATE AREAS OF FROST BY EARLY SUNDAY MORNING. ORZ023>026-051600- /O.NEW.KMFR.FR.Y.0021.090405T0900Z-090405T1600Z/ CENTRAL DOUGLAS COUNTY-EASTERN CURRY COUNTY AND JOSEPHINE COUNTY- EASTERN DOUGLAS COUNTY FOOTHILLS-JACKSON COUNTY- INCLUDING THE CITIES OF...ROSEBURG...SUTHERLIN...GREEN... STEAMBOAT...TOKETEE FALLS...MEDFORD...ASHLAND 252 PM PDT SAT APR 4 2009 ...FROST ADVISORY IN EFFECT FROM 2 AM TO 9 AM PDT SUNDAY... THE NATIONAL WEATHER SERVICE IN MEDFORD HAS ISSUED A FROST ADVISORY...WHICH IS IN EFFECT FROM 2 AM TO 9 AM PDT SUNDAY. LOW TEMPERATURES WILL GENERALLY FALL INTO THE LOW TO MID 30S TONIGHT OVER INTERIOR VALLEYS IN SOUTHWEST OREGON. LOCALLY... TEMPERATURES COULD BRIEFLY DIP BELOW FREEZING. HOWEVER...SUB FREEZING TEMPERATURES SHOULD OCCUR FOR PERIODS NO LONGER THAN 2 HOURS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FROST ADVISORY MEANS THAT FROST IS POSSIBLE. SENSITIVE OUTDOOR PLANTS MAY BE KILLED IF LEFT UNCOVERED. && $$ MWJ
1 follow-up statement
000 WWUS76 KMFR 051529 NPWMFR URGENT - WEATHER MESSAGE NATIONAL WEATHER SERVICE MEDFORD OR 829 AM PDT SUN APR 5 2009 ...FROST THREAT HAS ENDED... ORZ023>026-051630- /O.CAN.KMFR.FR.Y.0021.000000T0000Z-090405T1600Z/ CENTRAL DOUGLAS COUNTY-EASTERN CURRY COUNTY AND JOSEPHINE COUNTY- EASTERN DOUGLAS COUNTY FOOTHILLS-JACKSON COUNTY- INCLUDING THE CITIES OF...ROSEBURG...SUTHERLIN...GREEN... STEAMBOAT...TOKETEE FALLS...MEDFORD...ASHLAND 829 AM PDT SUN APR 5 2009 ...FROST ADVISORY IS CANCELLED... THE NATIONAL WEATHER SERVICE IN MEDFORD HAS CANCELLED THE FROST ADVISORY. THE FROST THREAT HAS ENDED SINCE TEMPERATURES ARE GENERALLY ABOVE 36 DEGREES AS OF 830 AM. $$ MWJ
The office that day
Everything else NWS Medford, OR issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 3, 11:26 PM PDT | Small Craft Advisory for Hazardous Seas | MFR | 12 hr |
Nearby
Frost Advisories in Oregon, 2009Every frost advisory in 2009
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.