Click for Day 1 FireWX Areal Outline Product
ZCZC SPCFWDDY1 ALL
FNUS21 KWNS 190911
DAY 1 FIRE WEATHER OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0411 AM CDT SUN AUG 19 2007
VALID 191200Z - 201200Z
...CRITICAL FIRE WEATHER AREA FOR GREAT BASIN...NRN ROCKIES...
...SYNOPSIS...
A VIGOROUS UPPER-LEVEL TROUGH ALONG THE W COAST WILL ACCELERATE
E/NEWD ACROSS THE PACIFIC NW/GREAT BASIN TODAY...BECOMING
INCREASINGLY NEGATIVELY-TILTED AS IT REACHES THE NRN ROCKIES
TONIGHT. A BROAD SWATH OF MODERATE TO STRONG MID-LEVEL SWLYS WILL
SPREAD ACROSS MUCH OF THE GREAT BASIN/NRN ROCKIES. AT THE
SURFACE...A LEE CYCLONE WILL INTENSIFY OVER CNTRL MT/SWRN
SASKATCHEWAN...WHILE AN ATTENDANT SHARP COLD FRONT WILL EXTEND FROM
THE LOW TO THE NRN GREAT BASIN BY LATE AFTERNOON.
...CRITICAL FIRE WEATHER AREA - GREAT BASIN...NRN ROCKIES...
PRIMARY CONDITIONS: STRONG WINDS / LOW RH / LONG-TERM DROUGHT
A HIGHER-END CRITICAL THREAT IS EXPECTED TO AFFECT A LARGE PORTION
OF THE GREAT BASIN/NRN ROCKIES LATER THIS MORNING THROUGH EARLY
EVENING. SUSTAINED SWLY SURFACE WINDS OF 20 TO 30 MPH WILL BE QUITE
COMMON. MORE INTENSE SUSTAINED WINDS /APPROACHING 40 MPH/...ARE
EXPECTED OVER PORTIONS OF ERN ID/SWRN MT BENEATH THE CORE OF A
MID-LEVEL JET AND AS A SHARP COLD FRONT PASSES. THIS MAY LEAD TO A
BRIEF DURATION OF EXTREME CONDITIONS...HOWEVER THE LENGTH OF LOW RH
DOES NOT APPEAR TO BE LONG ENOUGH TO JUSTIFY AN UPGRADE TO EXTREMELY
CRITICAL. ELSEWHERE...RH VALUES WILL GENERALLY RANGE FROM 10 TO 20
PERCENT...WITH THE LONGEST DURATION OF CRITICALLY LOW RH ACROSS THE
CNTRL GREAT BASIN. THE PASSAGE OF A COLD FRONT FROM NW TO SE THIS
AFTERNOON/EVENING WILL RESULT IN RAPID RH RECOVERY BEHIND THE
BOUNDARY...AS WELL AS A WIND SHIFT TO THE W/NW.
...WRN/CNTRL WY AND PORTIONS OF CNTRL MT...
ALTHOUGH STRENGTHENING LOW/MID-LEVEL SWLYS SHOULD RESULT IN
SUSTAINED SURFACE WINDS OF 20 TO 25 MPH BY LATE AFTERNOON...MIN RH
VALUES WILL LIKELY REMAIN TOO MARGINAL TO WARRANT A CRITICAL AREA.
SURFACE DEW POINTS WERE GENERALLY IN THE 40S TO LOWER 50S THIS
MORNING. THIS MOISTURE ALONG WITH DAYTIME HEATING AND STRONG
DYNAMICAL FORCING FROM THE ARRIVAL OF A POTENT UPPER-LEVEL TROUGH
WILL LEAD TO ISOLATED/SCATTERED TSTMS THIS AFTERNOON. A COLD FRONT
PASSAGE WILL ALSO SIGNIFICANTLY IMPROVE RH THIS EVENING. IT APPEARS
THE DURATION OF RH VALUES BETWEEN 15 TO 20 PERCENT WOULD BE
SHORT-LIVED GIVEN THIS SCENARIO.
..GRAMS.. 08/19/2007
...PLEASE SEE WWW.SPC.NOAA.GOV/FIRE FOR GRAPHIC PRODUCT...
Click for Day 2 FireWX Areal Outline Product
ZCZC SPCFWDDY2 ALL
FNUS22 KWNS 191009
DAY 2 FIRE WEATHER OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0509 AM CDT SUN AUG 19 2007
VALID 201200Z - 211200Z
...CRITICAL FIRE WEATHER AREA FOR PORTIONS OF ERN MT...
...CRITICAL FIRE WEATHER AREA FOR SRN WY...
...SYNOPSIS...
A VIGOROUS UPPER-LEVEL TROUGH IS EXPECTED TO BE OVER THE NRN ROCKIES
EARLY MON AND WILL LIFT NWD AS ITS SURFACE CYCLONE OCCLUDES. A
STRONG UPPER-LEVEL JET STREAK AND ASSOCIATED IMPULSE WILL SLIDE
ACROSS THE NERN PACIFIC THROUGH THE PACIFIC NW/SWRN CANADA. BELT OF
STRONG MID-LEVEL FLOW WILL BECOME ANCHORED IN A WEST-TO-EAST FASHION
ACROSS THE PACIFIC NW/NRN ROCKIES. ALTHOUGH RELATIVELY COOL
CONDITIONS ARE ANTICIPATED...DOWNSLOPE EFFECTS INVOF NRN ROCKIES
SHOULD BE SUFFICIENT FOR CRITICAL CONDITIONS IN THIS REGION MON
AFTERNOON.
...CRITICAL FIRE WEATHER AREA - PORTIONS OF ERN MT...
PRIMARY CONDITIONS: STRONG WINDS / LOW RH / RECENT DRYNESS
LOW/MID-LEVEL WLYS WILL REMAIN STRONG BEHIND A COLD FRONT PASSAGE
EXPECTED TO OCCUR LATE IN THE DAY 1 PERIOD. SUSTAINED SURFACE WINDS
OF 20 TO 30 MPH APPEAR LIKELY THROUGH MUCH OF THE DAY. ALTHOUGH THE
LOW-LEVEL THERMAL PROFILE WILL COOL FROM PREVIOUS DAYS...DOWNSLOPE
WARMING/DRYING SHOULD RESULT IN TEMPERATURES IN THE 70S TO LOWER 80S
AND RH VALUES AROUND 20 PERCENT DURING THE AFTERNOON.
...CRITICAL FIRE WEATHER AREA - SRN WY...
PRIMARY CONDITIONS: STRONG WINDS / LOW RH / LONG-TERM DROUGHT
THE AREA WILL REMAIN BENEATH MODERATELY STRONG LOW/MID-LEVEL WLYS
THROUGH MUCH OF THE DAYTIME PERIOD LEADING TO A LONG DURATION OF
SUSTAINED SURFACE WINDS AROUND 20 TO 25 MPH. THE LENGTH OF
CRITICALLY LOW RH APPEARS MORE MARGINAL. HOWEVER...BEING ON THE
FRINGE OF MORE SIGNIFICANT COOLING TO THE N/NW...AFTERNOON
TEMPERATURES IN THE MIDDLE 70S AND 80S SHOULD ALLOW MIN RH VALUES TO
REACH 15 PERCENT.
...FAR NERN CA/NRN NV/SERN ORE...
IT APPEARS PLAUSIBLE THAT A NARROW JUXTAPOSITION OF SUSTAINED WINDS
AROUND 20 MPH WITH RH VALUES NEAR 15 PERCENT MAY OCCUR DOWNWIND OF
THE SRN CASCADES/NRN SIERRAS LEADING TO POTENTIAL CRITICAL
CONDITIONS MON AFTERNOON. MUCH OF THE REGION WILL LIKELY REMAIN ON
THE SRN FRINGE OF STRONG ZONAL MID-LEVEL FLOW OVER THE PACIFIC NW.
MODEL GUIDANCE DOES DIFFER IN JUST HOW FAR SOUTH THESE WLYS WILL
RESIDE MON AFTERNOON AND THIS IS THE MAIN LIMITING FACTOR TO A
CRITICAL AREA ISSUANCE ATTM.
..GRAMS.. 08/19/2007
...PLEASE SEE WWW.SPC.NOAA.GOV/FIRE FOR GRAPHIC PRODUCT...