Fire Weather Outlook Discussion
Issued by NWS

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33
000
FNUS22 KWNS 271825
FWDDY2

DAY 2 FIRE WEATHER OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0125 PM CDT THU AUG 27 2015

VALID 281200Z - 291200Z

NO CHANGES HAVE BEEN MADE. PLEASE SEE PREVIOUS DISCUSSION FOR MORE
DETAILS.

..LEITMAN.. 08/27/2015

.PREV DISCUSSION... /ISSUED 0222 AM CDT THU AUG 27 2015/

...SYNOPSIS...
THE VIGOROUS UPPER LOW OVER THE NORTHEASTERN PACIFIC ON D1/THU WILL
MAKE GRADUAL PROGRESS INLAND ACROSS THE PACIFIC NORTHWEST THROUGHOUT
D2/FRI.  IMMEDIATELY DOWNSTREAM OF THIS STORM SYSTEM...AN UPPER
RIDGE FROM THE FOUR CORNERS NORTHWARD INTO MONTANA WILL MIGRATE
STEADILY EASTWARD...AND A WEAK SHORTWAVE WILL MOVE TOWARD THE
WESTERN GREAT LAKES REGION.  A BROAD/WEAK DISTURBANCE WILL REMAIN
QUASI-STATIONARY OVER THE LOWER MISSISSIPPI VALLEY AND GULF OF
MEXICO.

...NORTHERN CALIFORNIA NORTHEASTWARD INTO SOUTHEASTERN OREGON...
MODERATE TO STRONG /45-70 KNOT/ SOUTHWESTERLY MID-LEVEL FLOW WILL
OVERSPREAD THE REGION THROUGHOUT THE DAY AND INTO THE EVENING HOURS
ATOP A VERY DRY LOW-LEVEL AIRMASS IN PLACE OVER THE AREA.
INSOLATION/VERTICAL MIXING PROCESSES WILL TRANSPORT THAT
HIGHER-MOMENTUM AIR TO THE SURFACE...RESULTING IN SOUTHWESTERLY
SURFACE WINDS APPROACHING 20 MPH /WITH HIGHER GUSTS/ DURING THE
AFTERNOON AND EVENING HOURS.  THESE WINDS...ALONG WITH DRY FUELS AND
NEAR-CRITICAL SURFACE RH VALUES /AROUND 15 PERCENT/ WILL YIELD
ELEVATED TO LOCALLY CRITICAL FIRE WEATHER CONDITIONS FROM LATE
AFTERNOON INTO THE EARLY EVENING ACROSS THE AREA.

...NORTHEASTERN MONTANA...
A DRY AIRMASS WILL ALSO BE IN PLACE IN THIS REGION...WITH 12-20
PERCENT SURFACE RH VALUES EXPECTED FOR SEVERAL HOURS DURING THE
AFTERNOON.  SURFACE WINDS ARE EXPECTED TO APPROACH 15 MPH EARLY IN
THE DAY...BUT SHOULD WEAKEN SOME DURING THE DAY DUE TO UPPER RIDGING
BUILDING INTO THE AREA AND A NORTHERN-PLAINS SURFACE LOW MOVING AWAY
FROM THE AREA.  CURRENT INDICATIONS ARE THAT ANY ELEVATED FIRE
WEATHER CONDITIONS WILL BE TOO BRIEF FOR A DELINEATION AT THIS
TIME...ALTHOUGH IF SURFACE WINDS ARE STRONGER AND/OR LONGER DURATION
THAN CURRENTLY INDICATED IN MODEL GUIDANCE...AN ELEVATED /OR PERHAPS
CRITICAL/ FIRE WEATHER DELINEATION MAY ULTIMATELY BE NEEDED.  THIS
AREA WILL BE MONITORED IN FUTURE OUTLOOKS.

...PLEASE SEE WWW.SPC.NOAA.GOV/FIRE FOR GRAPHIC PRODUCT...




USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.