Area Forecast Discussion
Issued by NWS Bismarck, ND

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FXUS63 KBIS 290002
AFDBIS

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BISMARCK ND
702 PM CDT THU MAY 28 2015

.UPDATE...
ISSUED AT 654 PM CDT THU MAY 28 2015

COLD FRONT MOVING INTO NORTHWEST NORTH DAKOTA AT THIS TIME. TO THE
EAST OF THE FRONT A LEADING TROUGH ACROSS CENTRAL NORTH DAKOTA WAS
RESPONSIBLE FOR THUNDERSTORMS WITH HEAVY RAIN IN THE SOUTHERN JAMES
RIVER VALLEY SO FAR THIS EVENING. EXPECT A FEW HOURS OF THUNDERSTORMS
IN LAMOURE AND DICKEY COUNTIES THEN THINGS WILL TREND DOWN. WILL
HAVE TO WATCH WINDS TONIGHT. A FEW SHOWERS NORTHWEST SEEMS TO BE
KICKING THE WINDS UP A BIT WITH THE FRONTAL PASSAGE.

UPDATE ISSUED AT 1244 PM CDT THU MAY 28 2015

THE FORECAST FOR THE AFTERNOON REMAINS ON TRACK WITH ISOLATED
CONVECTION BEGINNING TO INITIATE ALONG A WEAK SURFACE TROUGH
ACROSS SOUTH CENTRAL NORTH DAKOTA AND A MORE DISTINCT PRE-FRONTAL
TROUGH ACROSS NORTHWEST NORTH DAKOTA. EXPECT CONVECTIVE COVERAGE
TO CONTINUE TO INCREASE IN ASSOCIATION WITH THESE FEATURES AIDED
BY MULTIPLE IMPULSES EJECTING OUT OF THE UPPER LEVEL LOW ACROSS
NORTHERN WYOMING AND SOUTH CENTRAL MONTANA. SPC CONTINUES TO
MAINTAIN A MARGINAL RISK WITH THEIR 1630Z DAY ONE CONVECTIVE
OUTLOOK. THIS IS PLAUSIBLE WITH A FEW STRONG TO SEVERE STORMS
POSSIBLE...ESPECIALLY ACROSS FAR SOUTH CENTRAL NORTH DAKOTA...THE
JAMES RIVER VALLEY AND INTO EASTERN NORTH DAKOTA WITH ML CAPE OF
AROUND 1500 J/KG. HOWEVER...OVERALL DEEP LAYER SHEAR IS
MARGINAL...ON THE ORDER OF 20-30 KTS.

UPDATE ISSUED AT 859 AM CDT THU MAY 28 2015

NO SIGNIFICANT CHANGES WITH THIS FORECAST UPDATE OTHER THAN TO
BLEND TO OBSERVED TRENDS THROUGH 14 UTC. EXPECT A LULL IN
CONVECTIVE ACTIVITY FOR THE NEXT COUPLE HOURS...UNTIL THE ARRIVAL
OF IMPULSES PROPAGATING NORTHEAST OUT OF WYOMING AND WESTERN SOUTH
DAKOTA AND POTENTIAL WEAK SCATTERED CONVECTION ACROSS THE
SOUTHWEST AND SOUTH CENTRAL AROUND 16-17 UTC.

UPDATE
ISSUED AT 638 AM CDT THU MAY 28 2015

SHOWERS CONTINUE TO PUSH EAST OUT OF MY EASTERN COUNTIES...SO
TWEAKED POPS TO MATCH. NEW SHOWER ACTIVITY ACROSS MY SOUTH
CENTRAL...FOLLOWED THE HRRR AND INCREASED POPS THERE FOR THIS.
ENOUGH INSTABILITY PRESENT TO INCLUDE ISOLD THUNDER.

&&

.SHORT TERM...(TODAY AND TONIGHT)

ISSUED AT 415 AM CDT THU MAY 28 2015

THUNDERSTORMS WILL ONCE AGAIN BE THE FOCUS FOR THE SHORT TERM.

EARLY THIS MORNING A PREFRONTAL TROUGH WAS PARKED ACROSS WESTERN
NORTH DAKOTA...WHILE A STATIONARY FRONT WAS DRAPED ACROSS
NORTHERN NORTH DAKOTA. LIGHT SHOWERS CONTINUE TO PUSH OFF TO THE
NORTH AND EAST. REDEVELOPMENT OF SHOWERS IS EXPECTED ALONG THE
FRONT THROUGH THE DAY. ACROSS WESTERN NORTH DAKOTA...WHERE SKIES
HAVE CLEARED OUT...FOG HAS DEVELOPED. THE HRRR IS SHOWING FOG
ACROSS WESTERN NORTH DAKOTA THROUGH THE EARLY MORNING HOURS.

LATER THIS AFTERNOON...THUNDERSTORMS ARE EXPECTED TO DEVELOP
ACROSS SOUTH CENTRAL AND SOUTHEASTERN NORTH DAKOTA ALONG THE
TROUGH AXIS. THE WRF/RAP/HRRR ARE SHOWING A RAPIDLY DESTABILIZING
BOUNDARY LAYER THIS AFTERNOON WITH 1000+ J/KG CAPE AND STEEP LOW
LEVEL LAPSE RATES. AGAIN THE INGREDIENT THAT APPEARS TO BE LACKING
IS SHEAR. HOWEVER...STRONG STORMS ARE POSSIBLE WITH GUSTY
WINDS...HAIL AND VERY HEAVY RAIN.

AS WE HEAD TOWARD THE LATE AFTERNOON AND EVENING HOURS...AN UPPER
LEVEL SHORTWAVE TROUGH WILL ENTER THE WESTERN DAKOTAS. THIS WILL
PROVIDE THE FORCING NEEDED TO KICK THE STATIONARY FRONT SOUTHWARD
ACROSS NORTH NORTH DAKOTA AS A COLD FRONT. WIDESPREAD SHOWERS AND
THUNDERSTORMS ARE EXPECTED TO DEVELOP ALONG THE FRONT LATE THIS
AFTERNOON AND EVENING.

.LONG TERM...(FRIDAY THROUGH WEDNESDAY)

ISSUED AT 415 AM CDT THU MAY 28 2015

A DRY AND COOL FRI-SAT AFTERNOON PERIOD FOLLOWED BY A MUCH MORE
ACTIVE WEATHER PATTERN SATURDAY NIGHT AND ONWARDS ARE THE MAIN
HIGHLIGHTS IN THE LONG TERM PERIOD.

A STABLE AIRMASS ASSOCIATED WITH A RIDGE OF SURFACE HIGH PRESSURE
WILL DEVELOP ACROSS THE NORTHERN PLAINS ON FRIDAY...REMAINING IN
PLACE THROUGH MUCH OF SATURDAY. HIGHS FRI-SAT COMFORTABLE AT
55-65. DRY AIR ACCOMPANYING THE SFC HIGH WILL BRING A CHANCE FOR
WIDESPREAD FROST FRIDAY NIGHT-SAT MORNING WITH FORECAST LOWS IN
THE 30S. WOULD EXPECT SOME SORT OF FROST HEADLINES BEING ISSUED
FOR THAT PERIOD OVER THE NEXT 24-36 HOURS.

ROBUST RETURN FLOW WEST SATURDAY AND AREA WIDE SUNDAY INTO EARLY
NEXT WEEK AS THE RIDGE OF HIGH PRESSURE MOVES OFF TO OUR EAST AND
A STRONG FRONTAL BOUNDARY DEVELOPS JUST OFF TO OUR WEST ACROSS THE
HIGH PLAINS. FIRST WAVE OF PRECIPITATION ARRIVES SATURDAY NIGHT AS
A STRONG MID LEVEL S/WV IMPULSE MOVES EAST IN ZONAL FLOW TOWARDS
AND ACROSS NORTH DAKOTA. BOTH GFS/EC SHOW LITTLE IF ANY
INSTABILITY SO REMOVED THUNDER AND WENT WITH STRAIGHT SHOWERS.
THIS AREA OF SHOWERS CONTINUES SUNDAY MORNING BEFORE MOVING OFF TO
OUR EAST BY SUNDAY AFTERNOON. SPOTTY POPS FOR THE REMAINDER OF
SUNDAY AND SUNDAY NIGHT ALONG WITH A SLIGHT CHANCE FOR T-STORMS.
WE WILL WARM BACK INTO THE 70S WEST AND SOUTH CENTRAL WHERE MODELS
PUT THE STRONGER WAA.

STRONG WARM AIR AND MOISTURE ADVECTION CONTINUES EARLY NEXT WEEK
WITH HIGH TEMPERATURES WARMING INTO THE 70S TO MID 80S ACROSS THE
REGION. THIS WILL RESULT IN INCREASING INSTABILITY MONDAY INTO
THE MIDDLE PORTIONS OF THE WEEK. 12Z GFS/EC MODELS STILL PROJECT
ANYWHERE FROM 1500-3500 J/KG OF MUCAPE ALONG WITH AMPLE WIND SHEAR
FOR THE MONDAY-WEDNESDAY TIMEFRAME. STILL LOTS OF UNCERTAINTY
WHERE THE BEST COMBINATION OF FORCING...INSTABILITY...AND SHEAR
WILL SET UP. WILL MENTION THE POSSIBILITY FOR STRONG THUNDERSTORMS
AND HEAVY RAINFALL IN THE HWO.

&&

.AVIATION...(FOR THE 00Z TAFS THROUGH 00Z FRIDAY EVENING)
ISSUED AT 654 PM CDT THU MAY 28 2015

AT 630 PM CDT A COLD FRONT WAS MOVING INTO NORTHWEST NORTH DAKOTA.
THE FRONT WILL MOVE EAST AND DRAW SOME STRATUS AND MVFR CEILINGS
SOUTH INTO THE REGION TONIGHT. OTHERWISE VFR AFTER 15Z ON FRIDAY.

&&

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

$$

UPDATE...WAA
SHORT TERM...AJ
LONG TERM...NH
AVIATION...WAA



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