619
FXUS63 KABR 220838
AFDABR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE ABERDEEN SD
238 AM CST SUN DEC 22 2024
KEY MESSAGES
- THERE IS A LOW (15-25%) CHANCE OF A LIGHT WINTRY MIX OF
PRECIPITATION, INCLUDING RAIN AND FREEZING RAIN OVER NORTH CENTRAL
SOUTH DAKOTA THIS AFTERNOON, AS WELL AS FREEZING RAIN OR SNOW OVER
NORTHEASTERN SD INTO WEST CENTRAL MN THIS EVENING.
- TEMPERATURES WILL RUN AROUND 5 TO 20 DEGREES ABOVE NORMAL THROUGH
NEXT SUNDAY.
SHORT TERM /TODAY THROUGH MONDAY AFTERNOON/
ISSUED AT 234 AM CST SUN DEC 22 2024
MAIN STORY IN THE SHORT TERM FORECAST IS THE POTENTIAL FOR SOME
LIGHT PRECIPITATION THIS AFTERNOON CAUSED BY AN UPPER LEVEL
SHORTWAVE. HI-RES GUIDANCE IS HESITANT TO BRING ANYTHING INTO THE
ABR AREA, AND INSTEAD KEEPS THE BEST CHANCES UP IN NORTH DAKOTA.
SOME LINGERING ENSEMBLE CHANCES OVER NORTH CENTRAL AND NORTHEASTERN
SOUTH DAKOTA AND WESTERN MINNESOTA IN ADDITION TO A FEW CAMS STILL
RESOLVING PRECIPITATION OVER THE AREA HAVE LED TO KEEPING SOME AREAS
OF SLIGHT CHANCE POPS IN THE NORTH SUNDAY EVENING THROUGH NIGHT.
IN TERMS OF PRECIPITATION TYPE, SOUNDINGS INDICATE THAT RAIN AND
FREEZING RAIN ARE THE MOST LIKELY TYPE OVER NORTH CENTRAL SOUTH
DAKOTA, WHILE SNOW AND FREEZING RAIN BECOME THE DOMINANT TYPES AS
THE SYSTEM PROGRESSES EASTWARD. EVERYTHING IS DEPENDENT ON BOTH
SURFACE TEMPERATURE AND MID-LEVEL MOISTURE THROUGH THE EVENT.
SOUNDINGS ARE A LITTLE UNCLEAR ON THE LATTER, BUT GENERALLY SUGGEST
THAT MOISTURE ALOFT NEEDED FOR SATURATION OF THE DGZ WILL NOT BE
PRESENT AT THE BEGINNING OF THE EVENT BUT WILL INCREASE OVER
NORTHEASTERN SOUTH DAKOTA AS THE EVENT CONTINUES. IN TERMS OF
SURFACE TEMPERATURES, WARM AIR ADVECTION WILL KEEP TEMPERATURES
ABOVE FREEZING OVER CENTRAL SOUTH DAKOTA, BUT THE SAME CANNOT BE
SAID FOR THE NORTHEASTERN PART OF THE FORECAST AREA. FREEZING LINE
FOR HIGH TEMPS AT THE SURFACE LOOKS TO SET UP IN A LINE NORTHWEST
TO SOUTHEAST ACROSS MCPHERSON, EDMUNDS, BROWN, AND SPINK COUNTIES.
TO SUMMARIZE, AT SOME POINT DURING THE EVENT (LIKELY ~0Z), A SWITCH
FROM SUPERCOOLED WATER TO ICE NUCLEI WILL OCCUR, AND PRECIPITATION
TYPES WILL CHANGE FROM RAIN AND FREEZING RAIN TO SNOW AND FREEZING
RAIN. REGARDLESS OF WHAT TYPE PRECIPITATION ENDS UP AT, QPF VALUES
ARE EXPECTED TO BE LOW, ONLY A COUPLE HUNDREDTHS OF LIQUID
EQUIVALENT AT THE MOST.
ON MONDAY, HIGH PRESSURE TO THE NORTH BEGINS TO BUILD INTO THE AREA.
LIGHT NORTHERLY WINDS SWITCH TO SOUTHERLY THROUGH THE DAY MONDAY.
CLOUD COVER OVER THE NORTHEASTERN FORECAST AREA WILL LIMIT HIGHS TO
THE 20S OVER NORTHEASTERN SOUTH DAKOTA AND WESTERN MINNESOTA, WHILE
RELATIVELY CLEARER SKIES OVER CENTRAL SOUTH DAKOTA WILL SUPPORT
HIGHS IN THE 30S TO LOW 40S.
LONG TERM /MONDAY EVENING THROUGH SATURDAY/
ISSUED AT 234 AM CST SUN DEC 22 2024
ABOVE NORMAL TEMPERATURES WILL CONTINUE THROUGH THE LONG TERM
FORECAST. WHILE MAINLY DRY WEATHER WILL CONTINUE, WE DO HAVE A
COUPLE MENTIONS OF LIGHT PRECIPITATION THURSDAY NIGHT ON. THERE IS
ONLY A 15-25% CHANCE OF A WINTRY MIX OVER OUR FAR SOUTHEASTERN
COUNTIES THURSDAY NIGHT, AND THEN OVER OUR EASTERN COUNTIES FRIDAY
NIGHT THROUGH SATURDAY.
AS FOR THE OVERALL WEATHER PATTERN, WE'LL BE STARTING OUT AT 00Z
TUESDAY WITH A 500MB RIDGE OVER THE DAKOTAS AND WESTERN MN. THIS
WILL BE SHORT LIVED AS A SHORTWAVE TROUGH OVER WESTERN MT/WESTERN WY
MOVES OVERHEAD TUESDAY INTO TUESDAY EVENING. ANOTHER RIDGE WILL
QUICKLY SLIDE ACROSS THE CENTRAL TO NORTHERN PLAINS TUESDAY NIGHT
INTO WEDNESDAY MORNING. A CHANGE TO THIS OSCILLATING PATTERN WILL
COME WEDNESDAY AS A 500MB LOW OVER THE 4-CORNERS OF THE INTERIOR
SOUTHWESTERN U.S. SHIFTS EAST ON THURSDAY INTO THURSDAY EVENING,
ACROSS THE CENTRAL TO SOUTHERN PLAINS STATES. THERE CONTINUES TO BE
SOME DISCREPANCIES BETWEEN MODELS ON HOW FAR NORTH-NORTHEAST THE LOW
TRACKS. THE OPERATIONAL MODELS BRING THE SURFACE LOW ANYWHERE FROM
EASTERN SD TO SOUTHWESTERN MO BY 18Z FRIDAY. THAT'S NEARLY A 475
MILE DIFFERENCE. AS EXPECTED, THIS LEADS TO SIGNIFICANT VARIABILITY
AND LOW CONFIDENCE IN SPECIFICS, LIKE CLOUD COVER AND ANY CHANCES OF
PRECIPITATION, WHICH COULD BE ON THE INCREASE IN LATER FORECASTS. AS
A RESULT, THERE WILL BE SEVERAL CHANGES TO THE FORECAST FOR THIS
PERIOD. THE 00Z ENSEMBLE EC GUIDANCE IS CLUSTERING MORE TO
PRECIPITATION CHANCES ON SATURDAY, AND THE GFS LOOKS TO BE TRENDING
THE SAME WAY. THE SLIGHT CHANCE (15-25% CHANCE) OF PRECIPITATION
OVER EASTERN SD/WEST CENTRAL MN LOOKS REASONABLE AT THIS TIME.
STILL, THE OVERALL TREND STEADY TO INCREASING HIGH AND LOW
TEMPERATURES WILL CONTINUE THROUGH AT LEAST FRIDAY, ON THE ORDER OF
5 TO 20 DEGREES.
AVIATION /06Z TAFS THROUGH 06Z SUNDAY/
ISSUED AT 1126 PM CST SAT DEC 21 2024
TERMINALS KABR,KATY,KPIR,KMBG
VFR CONDITIONS WILL PERSIST THROUGH MOST OF THE TAF PERIOD. A
WEAK SYSTEM WILL BE SLIDING EAST ACROSS THE DAKOTAS ON SUNDAY,
AND LOOKS TO BRING AREAS OF -FZRA/-SN TO SOUTHERN ND, POTENTIALLY
SNEAKING INTO FAR NORTHERN SD. CONFIDENCE IN THIS AFFECTING
KABR/KMBG IS LOW, SO WILL LEAVE OUT OF THE TAFS FOR THE TIME
BEING. WHAT'S MORE LIKELY TO OCCUR FROM THIS SYSTEM, IS SOME MVFR
CIGS MOVING SOUTH INTO THE AREA LATE IN THE TAF PERIOD AND HAVE
INSERTED MENTION OF THIS FOR KABR/KATY.
ABR WATCHES/WARNINGS/ADVISORIES
SD...NONE.
MN...NONE.
SHORT TERM...BC
LONG TERM...KF
AVIATION...TMT
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