Click for Day 1 FireWX Areal Outline Product
ZCZC SPCFWDDY1 ALL
FNUS21 KWNS 052135
DAY 1 FIRE WEATHER OUTLOOK RESENT 1
NWS STORM PREDICTION CENTER NORMAN OK
0435 PM CDT WED SEP 05 2007
VALID 051200Z - 061200Z
...CRITICAL FIRE WEATHER AREA FOR FAR SRN NV...
...SYNOPSIS...
...RESENT PER REQUEST...
AN UPPER-LEVEL LOW CENTERED OVER ERN ORE/WRN ID PER WATER VAPOR
IMAGERY...WILL SLOWLY TRANSLATE EWD AND LIKELY REACH WRN WY BY EARLY
THU. ASSOCIATED RIBBON OF MODERATE MID-LEVEL FLOW WILL REMAIN
CENTERED ACROSS THE SRN GREAT BASIN. AT THE SURFACE...A COLD FRONT
FROM NRN UT TO SRN NV WILL BECOME QUASI-STATIONARY TODAY PRIOR TO A
MORE RAPID ACCELERATION TONIGHT FOLLOWING THE PASSAGE OF THE
UPPER-LEVEL TROUGH AXIS. BEHIND THIS BOUNDARY...A RATHER TIGHT
SURFACE PRESSURE GRADIENT WILL REMAIN ACROSS NRN CA WITH STRONG HIGH
PRESSURE CENTERED OVER THE ERN PACIFIC.
...CRITICAL FIRE WEATHER AREA - FAR SRN NV...
PRIMARY CONDITIONS: MODERATE WINDS / LOW RH / SEVERE DROUGHT
SEVERAL FACTORS APPEAR TO CONFINE THE OVERALL AREA OF PROBABLE
CRITICAL CONDITIONS THIS AFTERNOON OVER PORTIONS OF THE SRN GREAT
BASIN. SLY LOW-LEVEL WINDS HAVE RESULTED IN A SURGE OF LOW-LEVEL
MOISTURE UP THE LOWER CO RIVER VALLEY OVER THE PAST 24 HOURS.
ALTHOUGH THESE WINDS WILL VEER SOMEWHAT...THE ERN/SRN EXTENT OF
CRITICAL CONDITIONS WILL BE HAMPERED BY THIS SURGE ALONG WITH THE
EXPECTATION OF STRONGEST LOW-LEVEL FLOW PRIMARILY IN THIS MOIST
SECTOR. FARTHER NW...A COLD FRONT HAS DROPPED INTO SRN NV WITH A
MUCH COOLER AIR MASS BEHIND IT. THUS...A SMALLER SECTOR OF VERY
WARM/DRY CONDITIONS IS NOW EXPECTED COMPARED TO PREVIOUS FORECASTS.
MODERATE MID-LEVEL W/SWLYS COMBINED WITH INCREASINGLY STEEP
LOW-LEVEL LAPSE RATES SHOULD RESULT IN SUSTAINED SURFACE WINDS
AROUND 20 MPH DURING PEAK HEATING. MIN RH VALUES WILL DROP TO
BETWEEN 8 TO 15 PERCENT.
...NRN SACRAMENTO VALLEY AREA...
LOCALLY GUSTY N/NELY DOWNSLOPE WINDS HAVE BEEN ONGOING THIS MORNING
OVER PORTIONS OF THE NRN CA COASTAL RANGES AND THE SRN CASCADES.
ALTHOUGH THE AIR MASS ACROSS NRN CA IS RELATIVELY COOL/MOIST
ATTM...OFFSHORE FLOW WILL CONTINUE THROUGH THE PERIOD FURTHERING
DOWNSLOPE WARMING/DRYING. AS A RESULT...TEMPERATURES THIS AFTERNOON
SHOULD RISE INTO THE LOWER TO MIDDLE 90S INVOF NRN SACRAMENTO VALLEY
LEADING TO MARGINALLY LOW RH AROUND 15 PERCENT. THIS SHOULD COINCIDE
WITH SUSTAINED WINDS AROUND FROM 15 TO 20 MPH. A SLIGHT RELAXATION
OF THE SURFACE PRESSURE GRADIENT IS EXPECTED IN THE NEXT 24
HOURS...BUT CONTINUED OFFSHORE FLOW SHOULD RESULT IN LOCALLY POOR
OVERNIGHT RH RECOVERY.
..GRAMS.. 09/05/2007
...PLEASE SEE WWW.SPC.NOAA.GOV/FIRE FOR GRAPHIC PRODUCT...
Click for Day 2 FireWX Areal Outline Product
ZCZC SPCFWDDY2 ALL
FNUS22 KWNS 052139
DAY 2 FIRE WEATHER OUTLOOK RESENT 1
NWS STORM PREDICTION CENTER NORMAN OK
0439 PM CDT WED SEP 05 2007
VALID 061200Z - 071200Z
...NO CRITICAL AREAS...
...SYNOPSIS...
AN UPPER-LEVEL LOW EXPECTED TO BE INVOF WRN WY EARLY THU SHOULD
ACCELERATE ITS EWD PROGRESSION AND BECOME AN OPEN WAVE AS AN
UPSTREAM SHORT WAVE TROUGH OVER SWRN CANADA DIGS TOWARDS THE NRN
ROCKIES. DOWNSTREAM HEIGHT FALLS WILL CONTRIBUTE TO SURFACE LOW
PRESSURE INTENSIFYING OVER SD WITH A SECONDARY LOW DEVELOPING OVER
NWRN KS THU AFTERNOON. A COLD FRONT WILL SURGE EWD AS THE SD SURFACE
CYCLONE LIFTS NEWD ACROSS THE UPPER MS RIVER VALLEY.
...SWRN SD/FAR ERN WY/WRN NEB PANHANDLE...
W/NWLY LOW-LEVEL FLOW SHOULD SUBSTANTIALLY INCREASE THU AFTERNOON
DUE TO THE COMBINATION OF DOWNSLOPE FLOW AND SUBSIDENCE BEHIND THE
PASSAGE OF A POTENT MID-LEVEL SHORT WAVE TROUGH. SUSTAINED SURFACE
WINDS OF 25 TO 35 MPH APPEAR LIKELY. MUCH UNCERTAINTY EXISTS WITH
RESPECT TO HOW MUCH DRYING WILL OCCUR. THE NAM IS FARTHER S WITH THE
TRACK OF ITS SURFACE LOW AND IS ALSO MUCH MORE MOIST THAN THE GFS
IMMEDIATELY W/WSW OF THE LOW. EVEN IF THE DRIER GFS FORECAST WOULD
BE CORRECT...THE OVERALL AREA OF POTENTIAL CRITICALLY LOW RH APPEARS
TO BE SMALL AND BRIEF IN DURATION. IN ADDITION...POSSIBLE RAINFALL
IN BOTH THE DAY 1/EARLY DAY 2 PERIODS MAY ALSO MITIGATE THE OVERALL
FIRE WEATHER THREAT THU AFTERNOON.
..GRAMS.. 09/05/2007
...PLEASE SEE WWW.SPC.NOAA.GOV/FIRE FOR GRAPHIC PRODUCT...