Click for Day 1 FireWX Areal Outline Product
ZCZC SPCFWDDY1 ALL
FNUS21 KWNS 200920
DAY 1 FIRE WEATHER OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0420 AM CDT FRI OCT 20 2006
VALID 201200Z - 211200Z
...CRITICAL FIRE WEATHER AREA FOR A PORTION OF NRN CA...
...SYNOPSIS...
ANOTHER UPPER TROUGH WILL DIG SEWD OUT OF THE PAC NW INTO THE
CENTRAL ROCKIES TODAY. AT THE SFC...HIGH PRESSURE WILL MOVE SEWD
INTO THE PAC NW/NRN GREAT BASIN IN THE WAKE OF THE UPPER TROUGH. AS
THIS HIGH MOVES INTO THE NRN GREAT BASIN...IT WILL SUPPORT A
STRENGTHENING OF THE OFFSHORE PRESSURE GRADIENT ACROSS NRN CA AND
GENERATION OF MODERATE WINDS. COMBINED WITH LOW RH READINGS AND
INCIPIENT DROUGHT CONDITIONS OVER THE AREA A CRITICAL FIRE WEATHER
THREAT IS ANTICIPATED TO DEVELOP LATER TODAY AND OVERNIGHT. A VERY
DRY AIRMASS WILL RESIDE OVER THE REMAINDER OF INTERIOR CA...BUT THE
OFFSHORE GRADIENTS SHOULD NOT BE STRONG ENOUGH TO SUPPORT CRITICAL
FIRE WEATHER CONDITIONS OVER CENTRAL/SRN CA. ELSEWHERE ACROSS THE
NATION...ANOTHER COLD AIRMASS WILL SINK SWD THROUGH THE NRN PLAINS
ASSOCIATED WITH A STRONG COLD FRONT. DRIER AIR WILL FILTER INTO THE
SERN STATES IN THE WAKE OF A COLD FRONT...BUT RECENT RAINFALL OVER
THIS REGION WILL PRECLUDE ANY FIRE WEATHER RELATED CONCERNS.
...CRITICAL FIRE WEATHER AREA - NRN CA...
PRIMARY CONDITIONS: SUSTAINED NNELY WINDS FROM 20-30 MPH WITH GUSTS
OVER 35 MPH DEVELOPING THIS AFTERNOON....LOW RH READINGS FROM 10-15
PERCENT...INCIPIENT DROUGHT
BEHIND ANOTHER UPPER TROUGH MOVING INTO THE CENTRAL ROCKIES
TODAY...A LARGE AREA OF SFC HIGH PRESSURE WILL BUILD SWD THROUGH THE
INTERIOR PAC NW INTO THE NRN GREAT BASIN. WITH UPPER RIDGING
BUILDING OFF THE PAC NW COAST...THE THERMAL TROUGH WILL SHIFT WWD
OFF THE NRN CA COAST BY THE END OF THE PERIOD. THE RESULT WILL BE A
MODERATE OFFSHORE PRESSURE GRADIENT DEVELOPING OVER THE REGION
/10-14 MB OVER 200 MILES/ BY SATURDAY MORNING. SUSTAINED NLY WINDS
FROM 15-25 MPH ARE LIKELY TO DEVELOP OVER THE NRN SAC VALLEY AND
MTNS OF NRN CA DURING THE AFTERNOON AS THE PRESSURE GRADIENT BEGINS
TO INTENSIFY...WITH THE STRONGEST OFFSHORE WINDS ANTICIPATED TO
DEVELOP LATER TONIGHT OVER THE COASTAL RANGES/FOOTHILLS AS THE
GRADIENT CONTINUES TO STRENGTHEN. VERY LOW RH READINGS FROM 10-15
PERCENT WILL BE COMMONPLACE OVER THE AREA WITH PRESENCE OF THE UPPER
RIDGE AND SUBSIDENT/COMPRESSIONAL FLOW OVER THE SRN CASCADES/NRN
SIERRA NEVADA AND COASTAL RANGE MTNS. MODERATE WINDS OVERNIGHT WILL
ALSO SUPPORT POOR RH RECOVERY. DESPITE LIGHT PRECIPITATION IN THE
LAST WEEK...THE OVERALL PRECIP TREND ACROSS THE AREA THE LAST COUPLE
OF MONTHS INDICATES INCIPIENT DROUGHT CONDITIONS.
...CENTRAL/SRN CA...
THE OFFSHORE GRADIENT WILL REMAIN RELATIVELY WEAK THROUGH FRIDAY
NIGHT. HOWEVER...MIN RH READINGS WILL REMAIN VERY LOW /10-15
PERCENT/ DUE TO PRESENCE OF REMNANT GREAT BASIN DRY AIR AND ABOVE
NORMAL TEMPERATURES. LACK OF STRONGER THAN 20 MPH WINDS WILL
PRECLUDE A CRITICAL OUTLOOK AREA. THE GRADIENT IS EXPECTED TO
INCREASE SATURDAY NIGHT WHICH MAY SUPPORT A CRITICAL FIRE WEATHER
THREAT.
...SRN HIGH PLAINS...
IN THE WAKE OF HIGH PRESSURE AND AHEAD OF THE UPPER TROUGH OVER THE
ROCKIES...THE SFC LEE TROUGH WILL INTENSIFY OVER THE SRN HIGH PLAINS
SUPPORTING SUSTAINED SSWLY WINDS FROM 15-25 MPH THIS AFTERNOON.
SEASONABLY LOW DEWPTS AND WARMING TEMPERATURES DUE TO INCREASING
DOWNSLOPE FLOW WILL SUPPORT MIN RH READINGS FROM 15-20 PERCENT OVER
PORTIONS OF ERN NM...SERN CO AND WRN TX. RECENT RAINFALL OVER THE
REGION WILL LIMIT ANY CRITICAL FIRE WEATHER THREAT HOWEVER.
..CROSBIE.. 10/20/2006
...PLEASE SEE WWW.SPC.NOAA.GOV/FIRE FOR GRAPHIC PRODUCT...
Click for Day 2 FireWX Areal Outline Product
ZCZC SPCFWDDY2 ALL
FNUS22 KWNS 200920
DAY 2 FIRE WEATHER OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0420 AM CDT FRI OCT 20 2006
VALID 211200Z - 221200Z
...CRITICAL FIRE WEATHER AREA FOR A PORTION OF NRN CA...
...SYNOPSIS...
THE UPPER TROUGH OVER THE ROCKIES TODAY WILL SHIFT INTO THE PLAINS
TOMORROW. IN THE WAKE OF THE TROUGH...SFC HIGH PRESSURE WILL SHIFT
SEWD THROUGH THE GREAT BASIN. OFFSHORE FLOW IS EXPECTED TO
RESTRENGTHEN OVER CENTRAL/SRN CA AS A RESULT...LEADING TO THE
POSSIBLE RE-DEVELOPMENT OF CRITICAL FIRE WEATHER CONDITIONS TO THIS
AREA. MEANWHILE...OFFSHORE FLOW WILL REMAIN STRONG OVER NRN CA EARLY
IN THE PERIOD...BEFORE DIMINISHING. ELSEWHERE ACROSS THE NATION...A
STRONG COLD FRONT WILL PUSH THROUGH THE SRN PLAINS IN ADVANCE OF THE
PLAINS UPPER TROUGH.
...CRITICAL FIRE WEATHER AREA - A PORTION OF NRN CA EARLY IN THE
DAY...
PRIMARY CONDITIONS: SUSTAINED NELY WINDS FROM 20-30 MPH WITH GUSTS
UP TO 40 MPH...MIN RH READINGS FROM 10-15 PERCENT
OFFSHORE GRADIENTS IN THE EARLY MORNING HRS...21/12Z-15Z...WILL
REMAIN STRONG /10-14 MB FROM SFO-WMC/. THIS WILL SUPPORT NELY WINDS
FROM 20-30 MPH WITH HIGHER GUSTS FROM THE EAST BAY HILLS NWD INTO
THE NRN COASTAL RANGE/FOOTHILLS OF NRN CA. AS THE SFC HIGH PRESSURE
AREA OVER THE INTERIOR PORTIONS OF THE PAC NW MOVES SWD INTO THE SRN
GREAT BASIN THROUGH TOMORROW...THE OFFSHORE GRADIENT OVER NRN CA
WILL WEAKEN SUFFICIENTLY TO PRECLUDE CRITICAL FIRE WEATHER
CONDITIONS REDEVELOPING SAT NIGHT. HOWEVER...DRY AIR /RH READINGS
FROM 10-20 PERCENT/ WILL SUPPORT VERY HIGH FIRE DANGER THE REMAINDER
OF THE PERIOD.
...SRN/CENTRAL CA...
AS THE SFC HIGH PRESSURE AREA MOVES SWD THROUGH THE GREAT
BASIN...THE OFFSHORE FLOW WILL RE-STRENGTHEN LATE IN THE PERIOD. THE
DEGREE OF STRENGTH OF THE SFC HIGH IS SOMEWHAT UNCERTAIN. THUS THE
STRENGTH OF THE OFFSHORE GRADIENT WILL REMAIN UNCERTAIN ENOUGH TO
NOT WARRANT A CRITICAL FIRE WEATHER ISSUANCE ATTM. IF LATER FCSTS
INDICATE A STRONGER GRADIENT...THEN PORTIONS OF THE AREA WOULD NEED
TO BE UPGRADED GIVEN A VERY DRY AIRMASS THAT WILL REMAIN IN PLACE
OVER THE REGION.
...LOWER CO RIVER VALLEY...
SIMILAR TO AREAS FURTHER WEST...THE DEGREE OF STRENGTH OF SFC HIGH
OVER THE SRN GREAT BASIN DURING THE PERIOD REMAINS UNCERTAIN. IF
LATER FCSTS INDICATE SUFFICIENTLY STRONG N-S GRADIENT...THEN
SUSTAINED NLY WINDS AROUND 20 MPH WOULD BE REALIZED AND COMBINED
WITH MIN RH READINGS FROM 10-15 PERCENT WOULD PRODUCE CRITICAL FIRE
WEATHER CONDITIONS.
..CROSBIE.. 10/20/2006
...PLEASE SEE WWW.SPC.NOAA.GOV/FIRE FOR GRAPHIC PRODUCT...