442
FNUS22 KWNS 041909
FWDDY2
DAY 2 FIRE WEATHER OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0208 PM CDT THU SEP 04 2025
VALID 051200Z - 061200Z
A RATHER EXPANSIVE ISODRYT AREA WAS ADDED AS SCATTERED TO WIDESPREAD
MIXED WET/DRY THUNDERSTORMS ARE EXPECTED ACROSS CENTRAL
OREGON/VICINITY TOMORROW WITH MORE ISOLATED COVERAGE INTO WESTERN
OREGON AND WESTERN/CENTRAL WASHINGTON. LATE EVENING AND NOCTURNAL
THUNDERSTORMS ARE POSSIBLE IN PORTIONS OF CENTRAL/EASTERN/NORTHWEST
OREGON AND WESTERN WASHINGTON.
WHILE WETTING RAIN IS LIKELY IN PORTIONS OF CENTRAL/EASTERN OREGON,
THE AMOUNT OF LIGHTNING AND DRY TO VERY DRY FUELS AS EVIDENT BY NEW
IGNITIONS AND ACTIVE TO EXTREME FIRE BEHAVIOR ON LARGE FIRES IN THE
REGION SUPPORT THE INTRODUCTION OF AN ISODRYT AREA. STORMS WILL
TRACK GENERALLY NORTHWARD AT 10-20 KNOTS LIKELY PRODUCING ABUNDANT
LIGHTNING, INCLUDING OUTSIDE OF THE CORES, WITH DRIER AIR MOVING
INTO PORTIONS OF SOUTHERN/CENTRAL OREGON BEHIND THEM. PRECIPITABLE
WATER VALUES WILL RANGE FROM 0.7-1.3" IN THE ISODRYT AREA AND
TRAINING OF STORMS WITH SOME OF THOSE HIGHER PWAT VALUES WILL LEAD
TO WETTING RAIN IN AREAS. THE ONSHORE FLOW/MARINE LAYER IS ALSO
PRECLUDING INCLUDING MORE OF COASTAL OREGON IN THE ISODRYT AREA AS
IT LOOKS TO DEEPEN TOMORROW, BUT THUNDERSTORMS MAY GO UP THE COAST
RANGES LATE TOMORROW.
DEEP PYROCONVECTION REMAINS POSSIBLE ON VERY ACTIVE LARGE WILDFIRES
IN THE NORTHWEST, NORTH IDAHO, AND CALIFORNIA. A COMPLICATING FACTOR
IN THIS FORECAST IS THE QUANTITY OF SMOKE THAT WILL BE IN THE REGION
FROM EXISTING FIRES AND BEING TRANSPORTED SOUTHWARD FROM CANADA.
..NAUSLAR.. 09/04/2025
PREV DISCUSSION
/ISSUED 1249 AM CDT THU SEP 04 2025/
..SYNOPSIS
A SECONDARY MID-LEVEL WAVE WILL TRAVERSE THE PACIFIC NORTHWEST ON
D2/FRIDAY. THIS WAVE WILL BRING MUCH COOLER TEMPERATURES, HIGHER
RELATIVE HUMIDITY, AND POTENTIAL FOR MORE WIDESPREAD THUNDERSTORM
ACTIVITY. WHILE LIGHTNING EFFICIENCY MAY INCREASE, INCREASE COVERAGE
OF THUNDERSTORMS AND BETTER ORGANIZATION WITH INCREASING SHEAR
SHOULD PROMOTE HEAVIER CORES AND WETTING RAINFALL POTENTIAL. AS
SUCH, NO ISOLATED THUNDERSTORM AREAS WERE INCLUDED AT THIS TIME.
..PLEASE SEE WWW.SPC.NOAA.GOV/FIRE FOR GRAPHIC PRODUCT
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