Click for Day 1 FireWX Areal Outline Product
ZCZC SPCFWDDY1 ALL
FNUS21 KWNS 290817
DAY 1 FIRE WEATHER OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0317 AM CDT TUE SEP 29 2009
VALID 291200Z - 301200Z
...CRITICAL FIRE WEATHER AREA FOR CNTRL/SRN NV...UT...NWRN
AZ/CO...CNTRL/SRN WY...
...SYNOPSIS...
A HIGHLY AMPLIFIED UPPER-LEVEL PATTERN WILL PERSIST WITH A RIDGE
OVER THE CNTRL CONUS FLANKED BY TROUGHS IN THE WEST AND EAST. THE
TROUGH ALONG THE PACIFIC NW/NRN CA COAST WILL PROGRESS INLAND INTO
THE INTERMOUNTAIN WEST/GREAT BASIN THROUGH EARLY WED. LEE
CYCLOGENESIS WILL OCCUR IN THE NRN HIGH PLAINS...WITH AN ATTENDANT
COLD FRONT DRAPED SWWD THROUGH THE CNTRL GREAT BASIN THIS AFTERNOON.
...CRITICAL FIRE WEATHER AREA - CNTRL/SRN NV...UT...NWRN
AZ/CO...CNTRL/SRN WY...
PRIMARY CONDITIONS: STRONG WINDS / LOW RH / RECENT DRYNESS
STRENGTHENING LOW/MID-LEVEL SWLYS ACROSS THE CNTRL/SRN GREAT BASIN
TOWARDS THE NRN HIGH PLAINS SHOULD LEAD TO A BROAD SWATH OF CRITICAL
CONDITIONS THIS AFTERNOON THROUGH EARLY EVENING. STEEP LOW-LEVEL
LAPSE RATES WILL AID IN MIXING AND WIDESPREAD SUSTAINED SURFACE
WINDS FROM 20 TO 30 MPH. ALTHOUGH MID/UPPER-LEVEL CLOUD COVERAGE
WILL LIMIT INSOLATION TO SOME EXTENT...ABOVE-NORMAL TEMPERATURES AND
AN ANTECEDENT DRY AIR MASS WILL LEAD TO RH VALUES FALLING TO BETWEEN
8 TO 15 PERCENT IN MOST LOCALES. A COLD FRONT PASSAGE ACROSS CNTRL
NV INTO WRN UT THIS EVENING WILL RESULT IN A WIND SHIFT TO THE W/NW
WITH SUBSTANTIAL RH RECOVERY AND PROBABLE WETTING RAINFALL.
...FAR ERN MT/WRN DAKOTAS...
DESPITE A STEEP LOW-LEVEL INVERSION LIMITING THE DEPTH OF THE
BOUNDARY LAYER...THE AREA WILL REMAIN ON THE WRN FRINGE OF A TIGHT
SURFACE PRESSURE GRADIENT. THIS SHOULD LEAD TO SUSTAINED SELY
SURFACE WINDS FROM 20 TO 25 MPH. ALTHOUGH THERE WILL BE SOME
INCREASE IN MOISTURE TRANSPORT OF A MODIFIED CP AIR MASS...A NARROW
CORRIDOR OF RH VALUES DIPPING TO NEAR 20 PERCENT WILL RESULT IN
LOCALIZED/SHORT-DURATION CRITICAL CONDITIONS.
...ERN PANHANDLE/NRN FL...
MUCH DRIER AIR WILL ADVECT SEWD ACROSS THE AREA IN THE WAKE OF A
COLD FRONT PASSAGE EARLY THIS MORNING. BY EARLY AFTERNOON...RH
VALUES WILL DROP TO BETWEEN 20 AND 30 PERCENT AS TEMPERATURES WARM
INTO THE MIDDLE 80S. HOWEVER...LOW-LEVEL W/NWLYS WILL DIMINISH
THROUGH THE DAY...WITH SUSTAINED SURFACE SPEEDS AROUND 10 MPH DURING
THE AFTERNOON.
..GRAMS.. 09/29/2009
...PLEASE SEE WWW.SPC.NOAA.GOV/FIRE FOR GRAPHIC PRODUCT...
Click for Day 2 FireWX Areal Outline Product
ZCZC SPCFWDDY2 ALL
FNUS22 KWNS 290954
DAY 2 FIRE WEATHER OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0454 AM CDT TUE SEP 29 2009
VALID 301200Z - 011200Z
...CRITICAL FIRE WEATHER AREA FOR NRN AZ/FOUR CORNERS...
...CRITICAL FIRE WEATHER AREA FOR A PORTION OF THE CNTRL/SRN HIGH
PLAINS...
...CRITICAL FIRE WEATHER AREA FOR SRN CA COASTAL RANGES...
...SYNOPSIS...
A HIGHLY AMPLIFIED UPPER-LEVEL TROUGH WILL PROGRESS EWD FROM THE
INTERMOUNTAIN WEST/GREAT BASIN TO THE NRN HIGH PLAINS/CNTRL ROCKIES
BY EARLY THU. A BROAD BELT OF STRONG MID-LEVEL WLYS WILL PERSIST
ALONG THE SRN PERIPHERY OF THE TROUGH...ARCING FROM THE WRN GREAT
BASIN TO THE FOUR CORNERS AND CNTRL ROCKIES ON WED AFTERNOON.
...CRITICAL FIRE WEATHER AREA - NRN AZ/FOUR CORNERS...
PRIMARY CONDITIONS: VERY STRONG WINDS / LOW RH / MODERATE DROUGHT
VERY STRONG LOW/MID-LEVEL FLOW WILL BE PREVALENT OVER MUCH OF ERN
UT/AZ AND THE CNTRL/SRN ROCKIES WED AFTERNOON. HOWEVER...DRIER AIR
WILL GENERALLY BE CONFINED FROM THE IMMEDIATE FOUR CORNERS SWWD
TOWARDS THE LOWER CO RIVER VALLEY. JUXTAPOSITION OF AT LEAST
MARGINALLY LOW RH VALUES /AROUND 15 PERCENT/ WITH SUSTAINED SURFACE
WINDS FROM 25 TO 35 MPH SHOULD OCCUR FROM THE HIGHER TERRAIN OF NRN
AZ TO THE FOUR CORNERS. GIVEN THE MAGNITUDE OF THE WINDS...A
HIGHER-END CRITICAL THREAT IS EXPECTED.
...CRITICAL FIRE WEATHER AREA - A PORTION OF THE CNTRL/SRN HIGH
PLAINS...
PRIMARY CONDITIONS: STRONG WINDS / LOW RH
SWLY LOW/MID-LEVEL FLOW WILL STRENGTHEN WED WITH APPROACH OF THE WRN
CONUS UPPER-LEVEL TROUGH. AS THE DRYLINE MIXES EWD ACROSS THE HIGH
PLAINS...A DEEPLY-MIXED BOUNDARY LAYER SHOULD RESULT IN SUSTAINED
SURFACE WINDS AROUND 25 MPH. DOWNSLOPE WARMING/DRYING OFF THE SRN
ROCKIES SHOULD SUPPORT RH VALUES FALLING TO BETWEEN 15 AND 20
PERCENT.
...CRITICAL FIRE WEATHER AREA - SRN CA COASTAL RANGES...
PRIMARY CONDITIONS: MODERATE OFFSHORE FLOW / LOW RH / SEVERE DROUGHT
OFFSHORE FLOW WILL STRENGTHEN ALONG THE TRANSVERSE RANGES N OF THE
LOS ANGELES BASIN WED EVENING AND SPREAD SWD ALONG THE PENINSULAR
RANGES INTO EARLY THU. THIS WILL PROMOTE LITTLE IF ANY RH RECOVERY
WED NIGHT AND SHOULD LEAD TO INCREASINGLY WIDESPREAD VALUES OF 10 TO
15 PERCENT. THE LOW-LEVEL PRESSURE GRADIENT WILL TIGHTEN OVERNIGHT
AS HIGH PRESSURE BUILDS INTO THE NWRN GREAT BASIN AND A TROUGH
SHIFTS OFF THE CA COAST. SUSTAINED SURFACE WINDS SHOULD REACH 20 MPH
BY 09-12Z/THU...WITH GUSTS OF 40 TO 50 MPH IN FAVORED
CANYONS/PASSES.
...CNTRL VALLEY AND WRN SLOPES OF THE SIERRA MTNS OF CA...
LOCALIZED/MARGINALLY CRITICAL CONDITIONS SHOULD DEVELOP INVOF THE
CNTRL VALLEY ON WED AFTERNOON AND ALONG THE WRN SLOPES OF THE
SIERRAS WED EVENING/NIGHT. ALTHOUGH MID-LEVEL FLOW WILL WEAKEN WED
AS THE WRN CONUS TROUGH SHIFTS EWD...A MODERATELY TIGHT LOW-LEVEL
PRESSURE GRADIENT SHOULD SUPPORT SUSTAINED SURFACE SPEEDS AROUND 15
TO 20 MPH. WITH AFTERNOON TEMPERATURES GENERALLY IN THE MIDDLE
70S...RH VALUES SHOULD BECOME MARGINALLY LOW AROUND 15 PERCENT.
GUSTY ELYS OFF THE SIERRAS WILL PROMOTE LITTLE TO NO OVERNIGHT RH
RECOVERY ALONG THE WRN FOOTHILLS.
..GRAMS.. 09/29/2009
...PLEASE SEE WWW.SPC.NOAA.GOV/FIRE FOR GRAPHIC PRODUCT...