Area Forecast Discussion
Issued by NWS Grand Forks, ND

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FXUS63 KFGF 250803
AFDFGF

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND FORKS ND
303 AM CDT FRI JUL 25 2014

.SHORT TERM...(TODAY THROUGH SATURDAY)
ISSUED AT 302 AM CDT FRI JUL 25 2014

CONVECTION CHANCES THROUGHOUT THE PERIOD WILL BE THE MAIN FORECAST
PROBLEM FOR THE SHORT TERM.

THE MAIN UPPER LOW REMAINS OVER SOUTHERN ALBERTA BUT A FEW WEAK
SHORTWAVE TROUGHS HAVE MOVED INTO THE NORTHERN PLAINS OVERNIGHT.
THE NORTHERN SHORTWAVE HAS BEEN PRODUCING STORMS OVER WESTERN ND
AND SOME OF THE ACTIVITY HAS BEEN MOVING INTO OUR NORTHWESTERN CWA
AND WEAKENING. THE SOUTHERN SHORTWAVE HAS INTERACTED WITH SOME
STRONG ELEVATED INSTABILITY AND THE LOW LEVEL JET TO SET OFF SOME
STORMS OVER EASTERN SD AND FAR SOUTHEASTERN ND. THE STORMS WERE
JUST UNDER SEVERE LIMITS AT TIMES BUT HAVE WEAKENED IN THE PAST
FEW HOURS. AS THE LOW LEVEL JET NOSE MOVES OFF TO THE EAST...THINK
THAT THE ACTIVITY OVER OUR SOUTHERN COUNTIES WILL GRADUALLY
WEAKEN.

TODAY...THE SFC LOW CURRENTLY OVER SD WILL WEAKEN AND MOVE
EAST...PUSHING A WEAK BOUNDARY/WIND SHIFT ACROSS THE CWA. TIMING
OF THE SYSTEM WILL BE KEY...AND IT IS POSSIBLE THAT THERE COULD BE
SOME CAPE VALUES OF 2000 J/KG AHEAD OF THE BOUNDARY. THE QUESTION
WILL BE IF THE CAP CAN BE OVERCOME WITH MOST OF THE BEST FORCING
OFF TO THE EAST. THE BOUNDARY MAY ALSO BE PAST OUR COUNTIES BEFORE
PEAK HEATING. WILL CONTINUE TO KEEP SOME 20-40 POPS GOING MAINLY
OVER OUR EASTERN COUNTIES...BUT WILL LEAVE OUT ANY MENTION OF
STRENGTH FOR NOW.

THE UPPER LOW OVER SASK WILL CONTINUE TO MOVE SLOWLY SOUTHEASTWARD
TONIGHT...DROPPING INTO THE NORTHERN CWA BY TOMORROW. SFC LOW
PRESSURE WILL REDEVELOP OVER SOUTHERN CANADA AND MOVE EAST...THIS
TIME DROPPING A PRETTY SUBSTANTIAL COLD FRONT INTO THE AREA. TEMPS
WILL BE TRICKY FOR SATURDAY BUT FOR NOW WENT LOW 70S IN THE NORTH
TO LOW 80S IN THE SOUTHEAST. MODELS MAINLY HAVE PRECIP MOVING IN
ALONG THE FRONTAL BOUNDARY INTO OUR NORTHERN COUNTIES IN THE
AFTERNOON...WHICH SEEMS REASONABLE. INSTABILITY WILL BE PRETTY
WEAK...UNDER 1000 J/KG SO SEVERE THREAT IS NOT IMPRESSIVE.

.LONG TERM...(SATURDAY NIGHT THROUGH THURSDAY)
ISSUED AT 302 AM CDT FRI JUL 25 2014

SATURDAY NIGHT THROUGH SUNDAY NIGHT...COLD AIR ADVECTION BEHIND A
COLD FRONT WILL CONTINUE THROUGH SATURDAY NIGHT. HIGH PRESSURE
WILL BUILD INTO THE NORTHERN PLAINS THROUGH SUNDAY AND SUNDAY
NIGHT. EVEN WITH THE SFC HIGH...WITH THE UPPER LOW IN THE AREA
THERE COULD STILL BE SOME SHOWER AND THUNDERSTORM DEVELOPMENT WITH
DAYTIME HEATING...PARTICULARLY IN THE EAST WHERE MID LEVEL TEMPS
WILL BE THE LOWEST. SUNDAY SHOULD BE COOL WITH TEMPS WELL BELOW
SEASONAL AVERAGES AND LOWS SUNDAY NIGHT SHOULD DROP IN THE LOW TO
MID 50S.

MONDAY-THURSDAY...NORTHWEST FLOW ALOFT WILL REMAIN IN PLACE THROUGH
THE PERIOD...WITH SFC HIGH PRESSURE PROVIDING TRANQUIL CONDITIONS TO
START THE WEEK. A VERY GRADUAL INCREASE IN TEMPS IS EXPECTED THROUGH
MID-WEEK TO NEAR AVERAGE. MUCH OF THE PERIOD SHOULD BE DRY...WITH ANY
LOW MID-WEEK PRECIP CHANCES DEPENDENT ON LOW PREDICTABILITY LOW
AMPLITUDE SHORT WAVE TROUGHS RIDING OVER THE WESTERN US RIDGE.

&&

.AVIATION...(FOR THE 06Z TAFS THROUGH 06Z FRIDAY NIGHT)
ISSUED AT 1153 PM CDT THU JUL 24 2014

FOG LOOP INDICATED PLENTY OF BLOW OFF MOVING INTO THE AREA FROM THE
WEST. ALSO LOWER CLOUDS HAVE DEVELOPED MAINLY OVER NORTHEASTERN ND.
CIGS WERE 3 TO 4 THOUSAND FT. EXPECT CLOUDS TO LOWER NORTH OF
DEVELOPING PRECIP AREA FROM FAR TO JMS. SOME MVFR CIGS POSSIBLE
NORTH OF THE LINE OF PRECIP OR THE NORTHERN TWO THIRDS OF THE AREA
OVERNIGHT.


&&

.FGF WATCHES/WARNINGS/ADVISORIES...
ND...NONE.
MN...NONE.
&&

$$

SHORT TERM...JR
LONG TERM...JR/MAKOWSKI
AVIATION...HOPPES






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