Fire Weather Outlook Discussion
Issued by NWS

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
000
FNUS21 KWNS 311521
FWDDY1

DAY 1 FIRE WEATHER OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1020 AM CDT FRI JUL 31 2015

VALID 311700Z - 011200Z

NO CHANGES NEEDED...PLEASE SEE PREVIOUS DISCUSSION FOR MORE DETAILS.

..LEITMAN.. 07/31/2015

.PREV DISCUSSION... /ISSUED 0329 AM CDT FRI JUL 31 2015/

...SYNOPSIS...
AN UPPER-LEVEL RIDGE EXTENDING NWWD FROM THE SOUTHERN ROCKIES TO THE
CALIFORNIA/OREGON BORDER WILL REMAIN IN PLACE TODAY.  AS A
RESULT...HOT AND DRY CONDITIONS WILL PREVAIL OVER MUCH OF THE
INTERMOUNTAIN WEST.  HOWEVER...THE ABSENCE OF STRONG WINDS IN THE
LOWER HALF OF THE TROPOSPHERE AND A WEAK SURFACE PRESSURE GRADIENT
ACROSS THE REGION WILL LIMIT THE RISK FOR LARGE-SCALE CRITICAL FIRE
WEATHER CONDITIONS.  SOME POTENTIAL FOR ISOLATED DRY THUNDERSTORMS
EXISTS OVER THE HIGHER TERRAIN OF NRN CA AND SRN ORE AS MIDLEVEL
MOISTURE INCREASES.

...NORTHERN CALIFORNIA AND SOUTHWESTERN OREGON...
A WEAK MIDLEVEL IMPULSE CURRENTLY OVER CENTRAL CALIFORNIA /PER WATER
VAPOR IMAGERY/ MAY PLAY A ROLE IN MIDLEVEL MOISTENING AND
THUNDERSTORM INITIATION AS IT PROGRESSES INTO NORTHERN CALIFORNIA BY
THE AFTERNOON.  HOWEVER...ISOLATED THUNDERSTORM INITIATION
/SUPPORTED BY LATEST CONVECTION-ALLOWING MODEL RUNS/ IS MOST LIKELY
OVER THE HIGHER ELEVATIONS OF NORTHERN CALIFORNIA AND SOUTHWESTERN
OREGON THROUGH TERRAIN-INDUCED CIRCULATIONS DRIVEN BY DIURNAL
HEATING.  PW VALUES BELOW 0.75 IN AND DEEP/DRY SUB-CLOUD LAYERS WILL
SUPPORT ISOLATED DRY THUNDERSTORM POTENTIAL.

...PLEASE SEE WWW.SPC.NOAA.GOV/FIRE FOR GRAPHIC PRODUCT...



USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.