Area Forecast Discussion
Issued by NWS Boise, ID

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 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
000
FXUS65 KBOI 210234
AFDBOI

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
834 PM MDT MON APR 20 2015

.DISCUSSION...NO UPDATES TO THE FORECAST FOR TONIGHT WITH CLEAR
SKIES AND MILD TEMPERATURES. FOR TUESDAY LATEST MODEL SOLUTIONS
/18Z-00Z/ STILL SHOWING AFTERNOON SHOWER AND THUNDERSTORM
DEVELOPMENT OVER CENTRAL OREGON AND TEMPERATURES A FEW DEGREES
WARMER THAN TODAY.

&&

.AVIATION...VFR WITH SCATTERED HIGH LEVEL CLOUDS.  SURFACE WINDS
VARIABLE 10 KNOTS OR LESS.  WINDS ALOFT WEST-NORTHWEST AROUND 10
KNOTS UP THROUGH 10K FEET MSL.

&&

.PREV DISCUSSION...
SHORT TERM...UPPER RIDGE ALONG THE COAST WILL MOVE SLOWLY INLAND
WITH WARMING FOR OUR CWA THROUGH PART OF WEDNESDAY. LATE TUESDAY
NIGHT AND WEDNESDAY A SHORT WAVE TROUGH BEHIND THE RIDGE WILL PUSH
A SURFACE COLD FRONT EWD ACROSS OREGON ZONES.  FRONT WILL PROBABLY
NOT REACH SCENTRAL IDAHO UNTIL LATE WEDNESDAY WHICH WILL ALLOW TEMPS
TO GET QUITE WARM THERE.  MODELS HAVE BECOME MORE CONSISTENT WITH
THIS IDEA.  OREGON ZONES...HOWEVER...WILL COOL NOTICEABLY WEDNESDAY
BEHIND THE FRONT.  WITH THE LARGE TEMPERATURE DIFFERENTIAL ACROSS
OUR CWA WEDNESDAY EVEN A SLIGHT CHANGE IN TIMING OF THE COLD FRONT
WILL HAVE A BIG EFFECT ON MAX TEMPS.  MODELS HAVE ENOUGH MOISTURE
AND INSTABILITY FOR A CHANCE OF SHOWERS AND SLIGHT CHANCE OF
THUNDERSTORMS IN WRN HARNEY COUNTY TUESDAY EVENING.  THE SHOWERS
WILL EXPAND NEWD TUESDAY NIGHT BUT THE THUNDERSTORMS SHOULD END.
ON WEDNESDAY SHOWERS WILL RE-DEVELOP MAINLY IN THE IDAHO ZONES
AND INSTABILITY IN IDAHO WILL PROVIDE A SLIGHT CHANCE OF
THUNDERSTORMS.  OREGON SHOULD BE TOO COOL AND STABLE FOR
THUNDERSTORMS WEDNESDAY.

LONG TERM...WEDNESDAY NIGHT THROUGH MONDAY...THE SPLIT FLOW OVER
THE COAST IS STILL EVIDENT THROUGH FRIDAY...WITH WEAK SYSTEMS MOVING
INLAND NORTH AND SOUTH OF OUR CWA. WITH LIMITED DYNAMICS...SCATTERED
SHOWERS WILL BE MAINLY CONFINED OVER THE HIGHER TERRAIN. MODELS SHOW
ADEQUATE INSTABILITY FOR ISOLATED THUNDERSTORMS WEDNESDAY EVENING...
AS WELL AS OVER THE CENTRAL IDAHO MOUNTAINS FRIDAY AFTERNOON. MODELS
AGREE ON A LOW AMPLITUDE SHORT WAVE RIDGE OVER OUR AREA ON SUNDAY...
WITH ENOUGH MOISTURE FLOWING THROUGH THE RIDGE FOR A CONTINUING
CHANCE OF SHOWERS. AN UPPER LEVEL TROUGH IS SHOWN APPROACHING THE
NORTHWEST COAST ON MONDAY...WITH DRIER AND WARMER SOUTHWEST FLOW
ALOFT OVER THE INTERMOUNTAIN REGION. TEMPERATURES ARE EXPECTED TO BE
NEAR NORMAL THROUGH SUNDAY...THEN A FEW DEGREES ABOVE NORMAL ON
MONDAY.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...NONE.
OR...NONE.

&&

$$

WEATHER.GOV/BOISE

DISCUSSION...DG
AVIATION.....JA
PREV SHORT TERM...LC
PREV LONG TERM....JT/DD



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