An unseasonably cold air mass combined with mostly clearskies to bring very cold temperatures to south central Oregon.
Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS MFR wrote it up.
An unseasonably cold air mass combined with mostly clearskies to bring very cold temperatures to south central Oregon.
The local office's own words before the first event, 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 the first event at Jun 11, 12:55 AM PST, 2 hours 5 minutes earlier.
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MEDFORD OR
155 AM PDT MON JUN 11 2012
.DISCUSSION...TEMPERATURES ON THE EAST SIDE HAVE STAYED UP SO FAR
THIS MORNING THANKS TO A PERSISTENT NORTH WIND. BUT THE BOUNDARY
LAYER IS STARTING TO DECOUPLE AND TEMPERATURES ARE FALLING NOW, SO
FROST STILL LOOKS POSSIBLE AND WILL KEEP THE ADVISORY GOING THIS
MORNING.
LOOKS LIKE WE'RE GOING TO GET ONE MORE DAY OF MOSTLY CLEAR SKIES
AREA-WIDE TODAY, EVEN AT THE COAST. LATEST 11-3.9 SATELLITE SHOWS
THAT STRATUS HAS EDGED INTO OUR OUTER WATERS, BUT I DON'T THINK IT
WILL MAKE IT TO THE COAST BEFORE DAWN. WINDS AT THE COAST HAVE A
BIT OF AN OFFSHORE COMPONENT AND THIS IS HINDERING THE STRATUS'
EASTWARD MOVEMENT. WAS CONCERNED EARLIER ABOUT STRATUS FORMING
RIGHT AT THE COAST, BUT THAT LOOKS LESS LIKELY NOW WITH THE
OFFSHORE COMPONENT AND HAVING NOTICED THAT DEWPOINTS ARE EDGING
DOWN AS A RESULT. SO, THAT WAS A LONG WINDED WAY OF SAYING TODAY
WILL BE MOSTLY SUNNY AND WARM OVER ALL OF MY FORECAST AREA.
A WEAK UPPER RIDGE OVER US NOW WILL SHIFT EAST TONIGHT WITH ZONAL
FLOW ALOFT MOVING OVER THE PACNW. THIS WILL RESULT IN A GREATER
ONSHORE PUSH AND STRATUS INTRUSION TO THE COAST AND UMPQUA BY
TOMORROW MORNING. CLOUDS ARE PRETTY CERTAIN TO AFFECT THESE AREAS
AND IT MAY BE DEEP ENOUGH TO PRODUCE SOME LIGHT RAIN OR DRIZZLE AS
WELL. THIS WILL KNOCK TEMPERATURES BACK A BIT TOMORROW OVER THE
ENTIRE WEST SIDE, BUT THE GREATEST CHANGE WILL BE WHERE THE
STRATUS PERSISTS.
A SHORT WAVE WILL MOVE BY TOMORROW AFTERNOON AND KEEP LIGHT
RAIN/SHOWER CHANCES GOING OVER MUCH OF THE WEST SIDE. THIS WILL
RESULT IN AN EVEN GREATER ONSHORE PUSH WITH STRATUS PROBABLY
MAKING IT ALL THE WAY UP THE ROGUE VALLEY BY WED MORNING. THIS
PATTERN OF NOCTURNAL STRATUS INTRUSIONS AND AFTERNOON SUNSHINE
WILL BE THE RULE THROUGH THE REMAINDER OF THE WEEK, ALBEIT TO A
LESSER DEGREE. HAVEN'T MADE ANY CHANGES TO THE EXTENDED FORECAST
AS PREVIOUS THINKING STILL HOLDS. -WRIGHT
&&
.AVIATION...VFR ALL LOCATIONS THROUGH TODAY. STRATUS WILL PUSH
ONTO THE COAST THIS EVENING AND INTO THE UMPQUA BASIN OVERNIGHT,
PRODUCING A MIX OF MVFR AND IFR CIGS WITH SOME LIFR POSSIBLE AT
THE COAST. VFR CONTINUES ELSEWHERE THROUGH TONIGHT. -WRIGHT
&&
.MFR WATCHES/WARNINGS/ADVISORIES...
OR...FROST ADVISORY UNTIL 7 AM PDT THIS MORNING FOR ORZ030-031.
CA...FROST ADVISORY UNTIL 7 AM PDT THIS MORNING FOR CAZ085.
PZ...SMALL CRAFT ADVISORY FOR WINDS UNTIL 11 PM PDT THIS EVENING FOR
PZZ356-376.
SMALL CRAFT ADVISORY FOR HAZARDOUS SEAS UNTIL 11 PM PDT THIS
EVENING FOR PZZ356.
HAZARDOUS SEAS WATCH FROM WEDNESDAY AFTERNOON THROUGH FRIDAY
EVENING FOR PZZ376.HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MEDFORD OR 637 PM PDT SUN JUN 10 2012 CAZ085-ORZ030-031-111400- MODOC COUNTY- NORTHERN AND EASTERN KLAMATH COUNTY AND WESTERN LAKE COUNTY- CENTRAL AND EASTERN LAKE COUNTY- 637 PM PDT SUN JUN 10 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHERN CALIFORNIA AND SOUTH CENTRAL OREGON. .DAY ONE...TONIGHT A FROST ADVISORY HAS BEEN ISSUED EFFECTIVE FROM 2 AM TONIGHT UNTIL 7 AM PDT MONDAY MORNING. PLEASE SEE THE LATEST ADVISORY MESSAGE FOR FURTHER DETAILS. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THE FROST ADVISORY REMAINS IN EFFECT UNTIL 7 AM PDT MONDAY. NO OTHER SIGNIFICANT WEATHER IS EXPECTED DURING THE PERIOD. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
The national radar mosaic for the moment the first event began.
1 frost/freeze. Local standard time, as filed.
Reported low temperatures ranged from 27 to 40 degrees.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Oregon in 2012Every state in 2012This day in weather historyWarnings in Oregon, June 2012
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 375895.