Area Forecast Discussion
Issued by NWS Bismarck, ND

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000
FXUS63 KBIS 240847
AFDBIS

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BISMARCK ND
347 AM CDT SUN MAY 24 2015

.SHORT TERM...(TODAY AND TONIGHT)
ISSUED AT 317 AM CDT SUN MAY 24 2015

RAIN WILL FINALLY MAKE IT INTO NORTH DAKOTA TODAY/TONIGHT.

THE POTENT TROUGH ACROSS THE MOUNTAIN WEST HAS BEEN SLOWER TO
MOVE INTO THE PLAINS THAN PREVIOUS MODEL RUNS SUGGESTED. WITH THE
LATEST (00 UTC) RUNS THERE IS STILL A FAIR BIT OF UNCERTAINTY WITH
RESPECT TO RAIN AMOUNTS. THANKFULLY THEY ARE IN BETTER AGREEMENT
WITH THE PLACEMENT OF PRECIP TODAY/TONIGHT. IT APPEARS THE AREA OF
LIGHT RAIN CURRENTLY ACROSS CENTRAL SOUTH DAKOTA WILL CONTINUE TO
PUSH NORTH AND MAKE IT INTO SOUTHERN NORTH DAKOTA THIS MORNING.
THESE SHOWERS ARE EXPECTED TO BE RATHER LIGHT AND SCATTERED AS THE
MAIN AREA OF FORCING (SURFACE AND UPPER LEVEL LOW) REMAINS SOUTH
INTO NEBRASKA. HOWEVER...LATER TONIGHT THE SURFACE LOW LOOKS TO
PROPAGATE NORTH ACROSS SOUTH DAKOTA. THIS SHOULD PUT SOUTHERN
NORTH DAKOTA IN A FAVORABLE LOCATION TO RECEIVE SOME WIDESPREAD
MODERATE RAIN. AT THIS TIME IT LOOKS LIKE AREAS ALONG AND SOUTH OF
INTERSTATE 94 WILL SEE THE MOST PRECIPITATION...WITH TOTALS
ANYWHERE FROM HALF AN INCH TO AS MUCH AS ONE INCH OF RAINFALL. THE
LATEST TRENDS IN THE SHORT TERM HIGH-RES AND GLOBAL MODELS IS A
FURTHER SOUTH TRACK THAT COULD POTENTIALLY LEAVE NORTHERN NORTH
DAKOTA HIGH AND DRY. BUT...THERE HAS BEEN A GREAT MANY ALTERATIONS
FROM ONE MODEL RUN TO THE NEXT...SO THIS COULD EASILY CHANGE.

.LONG TERM...(MONDAY THROUGH SATURDAY)
ISSUED AT 317 AM CDT SUN MAY 24 2015

THE PROBLEM OF THE DAY IS PRECIPITATION TIMING AND LOCATION.

THE AFOREMENTIONED DELAYS IN PRECIPITATION ONSET FROM PAST FORECASTS
RESULTED IN REDUCTION OF PRECIPITATION CHANCES ACROSS THE NORTHERN
HALF OF THE STATE. THIS WAS SUPPORTED BY THE HIRES MODEL SUITE AND
THE 00 UTC GFS. THE ECMWF AND SREF MEAN...HOWEVER...CONTINUE TO MOVE
PRECIPITATION ACROSS THE NORTHERN HALF OF THE STATE. THE FORECAST
ALSO REDUCES CHANCES FOR THUNDERSTORMS THROUGH THE HOLIDAY AS THE
BEST INSTABILITY IS NOW FORECAST TO LARGELY REMAIN SOUTH.

THEREAFTER...CONTINUATION OF THE VERY ACTIVE PATTERN IS SUPPORTED
BY THE GFS/ECMWF/GEFS/GEM GLOBAL...BUT TIMING OF MIDDLE LEVEL
IMPULSES EJECTING OUT OF THE BROAD WESTERN U.S. UPPER LEVEL TROUGH
IS HIGHLY UNCERTAIN.

&&

.AVIATION...(FOR THE 06Z TAFS THROUGH 06Z SUNDAY NIGHT)
ISSUED AT 1214 AM CDT SUN MAY 24 2015

VFR CONDITIONS WILL CONTINUE THROUGH THE EARLY MORNING HOURS. PRECIPITATION
CHANCES WILL INCREASE ACROSS THE SOUTHERN TAF SITES BY SUNDAY
AFTERNOON AND EVENING. SOME LIGHT SCATTERED RAIN IS POSSIBLE SUNDAY
MORNING WITH MORE WIDESPREAD PRECIPITATION MOVING IN SUNDAY
EVENING. MVFR...AND MAYBE IFR CONDITIONS IN HEAVIER RAIN...ARE
LIKELY AT KDIK/KBIS/KJMS THIS EVENING. KEPT THE NORTHERN TAF
SITES VFR THROUGH THE PERIOD.


&&

.BIS WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

$$

SHORT TERM...AJ
LONG TERM...SCHECK
AVIATION...AJ



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