Alert archive / California / Frost Advisories in 2012
Frost Advisory 18, NWS Medford, OR
NWS Medford, OR issued this frost advisory at May 22, 2012, 2:20 PM PDT for Klamath County, Oregon; Modoc County, Siskiyou County, California. It took effect at May 23, 2012, 2:00 AM PDT. It was in force for 6 hr.
The area
The counties it named.
The facts
- Issued
- May 22, 2012, 2:20 PM PDT (21:20 UTC)
- In effect from
- May 23, 2012, 2:00 AM PDT
- Expired
- May 23, 2012, 7:51 AM PDT
- In force
- 6 hr
- Issued by
- NWS Medford, OR
Counties Modoc County, CA, Siskiyou County, CA, Klamath County, OR
The radar
The Medford radar (KMAX), 90 km from the middle of the area, began a volume at 21:19 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, 9.3 hours before the alert went out and 106 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
- 25 J/kg
- Mixed-layer CIN
- -11 J/kg
- Mixed-layer LCL
- 823 m above ground
- 0-6 km bulk shear
- 104 kt
- 0-1 km storm-relative helicity
- 31 m²/s²
- 0-3 km storm-relative helicity
- 251 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
685 WWUS76 KMFR 222120 NPWMFR URGENT - WEATHER MESSAGE NATIONAL WEATHER SERVICE MEDFORD OR 220 PM PDT TUE MAY 22 2012 ...FROST EXPECTED WEDNESDAY MORNING... CAZ084-ORZ029-231500- /O.UPG.KMFR.FZ.A.0007.120523T1000Z-120523T1400Z/ /O.NEW.KMFR.FR.Y.0018.120523T0900Z-120523T1500Z/ NORTHEAST SISKIYOU AND NORTHWEST MODOC COUNTIES-KLAMATH BASIN- INCLUDING THE CITIES OF...TULELAKE...DORRIS...ALTAMONT... KLAMATH FALLS 220 PM PDT TUE MAY 22 2012 ...FROST ADVISORY IN EFFECT FROM 2 AM TO 8 AM PDT WEDNESDAY... THE NATIONAL WEATHER SERVICE IN MEDFORD HAS ISSUED A FROST ADVISORY...WHICH IS IN EFFECT FROM 2 AM TO 8 AM PDT WEDNESDAY. THIS REPLACES THE FREEZE WATCH...WHICH IS NO LONGER IN EFFECT. * TEMPERATURES...32 TO 35 DEGREES FOR MOST LOCATIONS. IT WILL BE COLDER IN A FEW OF THE USUALLY COLDER LOCATIONS SUCH AS CHILOQUIN...MACDOEL...AND MT HEBRON...WHERE TEMPERATURES WILL FALL TO BETWEEN 28 AND 31 DEGREES. * TEMPERATURE INVERSION...THERE WILL BE AN INVERSION SO TEMPERATURES WILL BE WARMER ABOVE THE SURFACE LAYER. * TIMING...2 AM TO 8 AM. * LOCATIONS INCLUDE: KLAMATH FALLS...TULELAKE...DORRIS...ALTAMONT ...CHILOQUIN...MACDOEL...AND MT HEBRON. * IMPACTS...SENSITIVE VEGETATION COULD BE DAMAGED OR KILLED IF LEFT UNPROTECTED. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FROST ADVISORY MEANS THAT FROST IS POSSIBLE. SENSITIVE OUTDOOR PLANTS MAY BE KILLED IF LEFT UNCOVERED. && $$ BTL
2 follow-up statements
337 WWUS76 KMFR 230913 NPWMFR URGENT - WEATHER MESSAGE NATIONAL WEATHER SERVICE MEDFORD OR 213 AM PDT WED MAY 23 2012 ...FROST EXPECTED THIS MORNING AND THURSDAY MORNING... CAZ084-ORZ029-232315- /O.NEW.KMFR.FR.Y.0019.120524T0900Z-120524T1500Z/ /O.CON.KMFR.FR.Y.0018.000000T0000Z-120523T1500Z/ NORTHEAST SISKIYOU AND NORTHWEST MODOC COUNTIES-KLAMATH BASIN- INCLUDING THE CITIES OF...TULELAKE...DORRIS...ALTAMONT... KLAMATH FALLS 213 AM PDT WED MAY 23 2012 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM PDT THIS MORNING... ...FROST ADVISORY IN EFFECT FROM 2 AM TO 8 AM PDT THURSDAY... THE NATIONAL WEATHER SERVICE IN MEDFORD HAS ISSUED A FROST ADVISORY...WHICH IS IN EFFECT FROM 2 AM TO 8 AM PDT THURSDAY. A FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM PDT THIS MORNING. * TEMPERATURES...32 TO 35 DEGREES FOR MOST LOCATIONS. IT WILL BE COLDER IN A FEW OF THE USUALLY COLDER LOCATIONS SUCH AS CHILOQUIN...MACDOEL...AND MT HEBRON...WHERE TEMPERATURES WILL FALL TO BETWEEN 28 AND 31 DEGREES. * TEMPERATURE INVERSION...THERE WILL BE AN INVERSION SO TEMPERATURES WILL BE WARMER ABOVE THE SURFACE LAYER. * TIMING...2 AM TO 8 AM. * LOCATIONS INCLUDE: KLAMATH FALLS...TULELAKE...DORRIS... ALTAMONTCHILOQUIN...MACDOEL...AND MT HEBRON. * IMPACTS...SENSITIVE VEGETATION COULD BE DAMAGED OR KILLED IF LEFT UNPROTECTED. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FROST ADVISORY MEANS THAT FROST IS POSSIBLE. SENSITIVE OUTDOOR PLANTS MAY BE KILLED IF LEFT UNCOVERED. && $$ SK
582 WWUS76 KMFR 231451 NPWMFR URGENT - WEATHER MESSAGE NATIONAL WEATHER SERVICE MEDFORD OR 751 AM PDT WED MAY 23 2012 ...FROST EXPECTED THURSDAY MORNING... CAZ084-ORZ029-232300- /O.CAN.KMFR.FR.Y.0018.000000T0000Z-120523T1500Z/ /O.CON.KMFR.FR.Y.0019.120524T0900Z-120524T1500Z/ NORTHEAST SISKIYOU AND NORTHWEST MODOC COUNTIES-KLAMATH BASIN- INCLUDING THE CITIES OF...TULELAKE...DORRIS...ALTAMONT... KLAMATH FALLS 751 AM PDT WED MAY 23 2012 ...FROST ADVISORY REMAINS IN EFFECT FROM 2 AM TO 8 AM PDT THURSDAY... THE NATIONAL WEATHER SERVICE IN MEDFORD HAS CANCELLED THE FROST ADVISORY FOR THIS MORNING. A FROST ADVISORY REMAINS IN EFFECT FROM 2 AM TO 8 AM PDT THURSDAY. * TEMPERATURES...32 TO 36 DEGREES FOR MOST LOCATIONS. * TEMPERATURE INVERSION...THERE WILL BE AN INVERSION SO TEMPERATURES WILL BE WARMER ABOVE THE SURFACE LAYER. * TIMING...2 AM TO 8 AM. * LOCATIONS INCLUDE: KLAMATH FALLS...TULELAKE...DORRIS... ALTAMONT...CHILOQUIN...MACDOEL...AND MT HEBRON. * IMPACTS...SENSITIVE VEGETATION COULD BE DAMAGED OR KILLED IF LEFT UNPROTECTED. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FROST ADVISORY MEANS THAT FROST IS POSSIBLE. SENSITIVE OUTDOOR PLANTS MAY BE KILLED IF LEFT UNCOVERED. && $$
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 May 22, 8:59 AM PDT, 5 hours 21 minutes earlier.
Area forecast discussion, May 22, 8:59 AM PDT, 5 hours 21 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MEDFORD OR
859 AM PDT TUE MAY 22 2012
.DISCUSSION...
NO UPDATES WILL BE MADE TO THE FORECAST THIS MORNING. A NEW
FRONTAL BOUNDARY ARRIVING AT THE COAST AROUND NOON TODAY WILL GIVE
RISE TO SHOWERS ACROSS THE AREA TODAY. MOST OF THE PRECIPITATION
WILL BE ALONG AND NEAR THE COAST AND COAST RANGE TODAY, AS WELL AS IN
THE UMPQUA BASIN. SHOWERS WILL AFFECT OTHER PARTS OF THE WEST SIDE
AND EXTREME NORTHERN CALIFORNIA AND THE OREGON EAST SIDE, BUT RAIN
WILL BE MEASURABLE IN ONLY SOME OF THESE AREAS. A SIMILAR
PATTERN WILL CONTINUE THROUGH THURSDAY, WITH BREEZY CONDITIONS
SOUTH OF THE AREAS OF RAINFALL.
ON FRIDAY A LOW DROPPING SOUTH THROUGH THE AREA IS LIKELY TO
RESULT IN A MORE ORGANIZED AREA OF RAIN OUTSIDE OF THE COAST AND
UMPQUA BASIN. DETAILS ARE STILL UNCERTAIN REGARDING WHERE THIS
RAIN WILL FALL, BUT IT APPEARS MOST LIKELY OVER PORTIONS OF THE
EAST SIDE.
CURRENT GUIDANCE SUPPORTS TEMPERATURES RETURNING TO NEAR NORMAL
CONDITIONS FOR THE HOLIDAY WEEKEND. WE WILL LOOK INTO THIS FURTHER
TODAY TO CONFIRM. BTL
&&
.AVIATION...
PLEASE NOTE...MEASURED OBSERVATIONS AT NORTH BEND WILL NOT BE
AVAILABLE FROM TUESDAY MAY 22ND THROUGH THURSDAY MAY 24TH. MANUAL
OBSERVATIONS WILL BE TAKEN DURING THIS TIME...BUT THEY WILL BE
ESTIMATES AND OBSERVATIONS WILL NOT BE AVAILABLE FROM 9 PM PDT
UNTIL 7 AM PDT.
COASTAL MVFR CONDITIONS AND MOUNTAIN OBSCURATIONS ACROSS THE
FORECAST AREA WILL CONTINUE THROUGH TODAY. CEILINGS SHOULD STAY
JUST ABOVE MVFR OVER WEST SIDE VALLEYS. EAST OF THE CASCADES...INCREASING
SURFACE WINDS WILL GENERATE INCREASED TURBULENCE THIS AFTERNOON.
&&
.PREV DISCUSSION... /ISSUED 258 AM PDT TUE MAY 22 2012/
DISCUSSION...AFTER MEDFORD REGISTERED THE MOST DAILY RAINFALL IN
NEARLY A MONTH...AT 0.15 INCHES...A COOL...CLOUDY...AND GENERALLY
UNSETTLED WEATHER PATTERN WILL CONTINUE THROUGH TOMORROW AS A
FRONTAL BOUNDARY LINGERS OVER THE FORECAST AREA. THIS WILL BE
FOLLOWED BY AN UPPER LOW THURSDAY INTO FRIDAY THAT WILL PROVIDE
ADDITIONAL INGREDIENTS FOR SHOWERS. DAYTIME HIGH TEMPERATURES ARE
EXPECTED TO BE 5 TO 10 DEGREES BELOW NORMAL THROUGH FRIDAY.
TODAY...A SHORTWAVE AND UPGLIDE AT THE 300K ISENTROPE WILL
GENERATE PLENTY OF CLOUDS AND A ROUND OF LIGHT TO MODERATE
RAIN...MOSTLY ALONG AND WEST OF THE CASCADES. ADDITIONALLY...TODAY
WILL BE BREEZY EAST OF THE CASCADES. THE 18Z GFS SUGGESTED WINDY
CONDITIONS...AND THE SUBSEQUENT RUN CAME MORE IN LINE WITH THE 00Z
NAM...SO A CONSENSUS OF MODELS AND VERIFICATION OF TODAY'S
OBSERVATIONS YIELDED FORECAST WIND SPEEDS JUST BELOW ADVISORY
CRITERIA.
PRECIPITATION WILL DIMINISH OVERNIGHT AND REMAIN SPARSE ON
WEDNESDAY...INCREASING AGAIN THURSDAY AS AN UPPER LOW DIGS FROM
NORTH TO SOUTH ALONG THE COAST. 850MB TEMPERATURES WILL BOTTOM OUT
NEAR 1C WEDNESDAY AND THURSDAY MORNINGS...AND A FREEZE WATCH AT
NPWMFR HAS BEEN ISSUED FOR WEDNESDAY MORNING EAST OF THE CASCADES.
AT THIS TIME...CLOUDS WILL LIKELY BE TOO PREVALENT WEST OF THE
CASCADES FOR WIDESPREAD FROST OR FREEZE IN THE VALLEYS.
HOWEVER...SKY COVER WILL NEED TO BE ANALYZED THE NEXT FEW DAYS TO
FINE TUNE THE TEMPERATURE FORECASTS. THE AIR MASS IS AT ITS
COLDEST ON THURSDAY MORNING...SO EFFORTS WILL BE FOCUSED
PRIMARILY ON THIS TIMEFRAME. INSTABILITY ON THURSDAY PER TONIGHT'S
MODELS DOES NOT SUPPORT ADDING THUNDERSTORMS...BUT IT IS MARGINAL
AND WILL NEED TO BE LOOKED AT IN FURTHER SHIFTS FOR ANY TREND
TOWARDS INCREASED INSTABILITY.
ONCE THE UPPER LOW DIGS SOUTH ON FRIDAY...THE GFS...NAM...GEM...AND
ECMWF ALL PINPOINT LAKE AND MODOC COUNTY FOR SUBSTANTIAL
PRECIPITATION. TYPICALLY...NORTHERLY FLOW BEHIND LOWS FAVOR THESE
LOCATIONS...SO THE SOLUTIONS SEEM REASONABLE. THEREFORE...HAVE
BUMPED UP POPS AND QPF IN THIS AREA FOR FRIDAY MORNING.
A DRYING AND WARMING TREND IS EXPECTED OVER THE WEEKEND INTO EARLY
NEXT WEEK.
&&
.MFR WATCHES/WARNINGS/ADVISORIES...
OR...FREEZE WATCH FROM LATE TONIGHT THROUGH WEDNESDAY MORNING FOR
ORZ029.
CA...FREEZE WATCH FROM LATE TONIGHT THROUGH WEDNESDAY MORNING FOR
CAZ084.
PZ...SMALL CRAFT ADVISORY FOR WINDS UNTIL 8 PM PDT THIS EVENING FOR
PZZ350-356-370-376.
SMALL CRAFT ADVISORY FOR HAZARDOUS SEAS UNTIL 8 PM PDT THIS
EVENING FOR PZZ350-356-370-376.
BTL/SKHazardous weather outlook, May 22, 2:03 PM PDT, 17 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MEDFORD OR 203 PM PDT TUE MAY 22 2012 CAZ084-ORZ029-222215- NORTHEAST SISKIYOU AND NORTHWEST MODOC COUNTIES-KLAMATH BASIN- 203 PM PDT TUE MAY 22 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHERN CALIFORNIA AND SOUTH CENTRAL OREGON. .DAY ONE...THIS AFTERNOON AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED.
In the hours before
Local storm report, May 22, 8:39 AM PDT, 5 hours 41 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MEDFORD OR
839 AM PDT TUE MAY 22 2012
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0812 AM HEAVY RAIN 5 NNW BROOKINGS 42.12N 124.32W
05/22/2012 M1.88 INCH CURRY OR TRAINED SPOTTER
IN 24 HOURS ENDING AT 0800 PDT.
&&
STOCKTONThe office that day
Everything else NWS Medford, OR issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 21, 11:05 PM PDT | Small Craft Advisory for Winds | MFR | 18 hr | |
| May 21, 11:05 PM PDT | Small Craft Advisory for Hazardous Seas | MFR | 27 hr | |
| May 22, 2:58 AM PDT | Freeze Watch | MFR | Klamath | 11 hr |
Nearby
Frost Advisories in California, 2012Frost Advisories in Oregon, 2012Every frost advisory in 2012
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.