883
FXUS63 KABR 051135 AAA
AFDABR
AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE ABERDEEN SD
635 AM CDT SAT SEP 5 2026
KEY MESSAGES
- THERE IS A MARGINAL RISK (LEVEL 1 OUT OF 5) FOR SEVERE STORMS
OVER CENTRAL AND NORTHEASTERN SD AND WEST CENTRAL MN THIS
AFTERNOON INTO TONIGHT, AS WELL AS ON SUNDAY AND MONDAY. THE
PRIMARY HAZARDS WILL BE 1 INCH IN DIAMETER HAIL AND 60 MPH
WIND GUSTS.
- OUR WARMING TREND CONTINUES INTO THE WEEKEND, PEAKING AT 15 TO
20 DEGREES ABOVE NORMAL TODAY. HIGHS IN THE LOW 80S OVER
NORTHEASTERN SD TO UPPER 90S OVER CENTRAL SD ARE EXPECTED.
HIGHER HUMIDITY VALUES OVER CENTRAL SD WILL LEAD TO HEAT INDEX
VALUES IN SOME PLACES TO GET INTO THE TRIPLE DIGITS.
UPDATE
ISSUED AT 628 AM CDT SAT SEP 5 2026
AVIATION DISCUSSION UPDATED BELOW FOR THE 12Z TAFS.
DISCUSSION
ISSUED AT 140 AM CDT SAT SEP 5 2026
AS AN UPPER-LEVEL SHORTWAVE HAS MOVED OVER SD LAST NIGHT INTO THIS
MORNING, SCATTERED SHOWERS AND STORMS CONTINUE TO POP UP AND MOVE
OVER AREAS EAST OF THE MISSOURI RIVER. THE LOW LEVEL JET HAS SET UP
OVER THE AREA AND HAS BEEN HELPING TO DEVELOP AND SUPPORT THESE
SHOWERS AND STORMS AND IT WILL CONTINUE TO SUPPORT THEM INTO THE
MORNING. CONFIDENCE IN THE TIMING OF SHOWERS AND STORMS IS A BIT LOW
THIS MORNING, AS THE HIGH-RES MODELS HAVE HAD A HARDER TIME
CORRECTLY SHOWING WHAT IS ACTUALLY HAPPENING WHEN THEY INITIALIZE,
WHICH MAKES A PERSON HAVE A HARDER TIME TRUSTING WHAT THE MODELS
HAVE HAPPENING LATER ON IN THE RUN. WITH WARM, MOIST AIR CONTINUING
TO MOVE INTO CENTRAL AND NORTHEASTERN SD, THE ENVIRONMENT IS PRIMED
FOR SHOWERS AND STORMS TO CONTINUE TO DEVELOP EARLY THIS MORNING.
CAPE VALUES THIS MORNING ARE BETWEEN 1000-2000 J/KG OVER CENTRAL AND
NORTHEASTERN SD. THERE ARE MID-LEVEL LAPSE RATES OF 7-8 C/KM AND
ABOUT 30-40 KTS OF SHEAR IN THE ENVIRONMENT. WHILE SO FAR THE
SCATTERED PULSY SHOWERS AND STORMS HAVEN'T BECOME SEVERE, IF THEY
ARE ABLE TO GET STRONG ENOUGH TO TAP INTO THE ENVIRONMENT AND THE
SUPPORT OF THE LOW LEVEL JET, THEN THEY COULD BECOME SEVERE. IF THAT
HAPPENS, THEN THE STORMS COULD HAVE HAIL UP AROUND 1 INCH IN
DIAMETER AND WIND GUSTS OF 60 MPH. AFTER THE LOW LEVEL JET DIES BACK
THIS MORNING, THE SHOWERS AND STORMS WILL LIKELY BACK OFF FOR A FEW
HOURS.
MORE WARM, MOIST AIR WILL BE PUSHING INTO CENTRAL AND NORTHEASTERN
SD TODAY. TEMPERATURES WILL BE GETTING UP INTO THE LOW 80S OVER FAR
NORTHEASTERN SD AND INCREASE TO THE WEST WITH HIGHS IN THE UPPER
90S. THE HIGHER HUMIDITY VALUES WILL CAUSE THE HEAT INDEX VALUES
OVER CENTRAL SD TO INCREASE AND GET INTO THE TRIPLE DIGITS IN SOME
AREAS. AFTER THE SHOWERS AND STORMS MOVE THROUGH THIS MORNING, THE
HEAT AND HUMIDITY WILL HELP TO INCREASE CAPE VALUES BACK UP TO 1000-
3000 J/KG THIS AFTERNOON AND TONIGHT. 850MB TEMPERATURES WILL ALSO
BE WARMER TODAY, WITH MODELS SHOWING TEMPERATURES BETWEEN 20-28
DEGREES C. THESE TEMPERATURES WILL HELP TO PLACE A PRETTY DECENT CAP
OVER CENTRAL AND NORTHEASTERN SD. THIS WILL LIKELY BE A SIMILAR
SITUATION TO YESTERDAY, WHERE THERE WILL BE SCATTERED JUNKY AND
PULSY SHOWERS AND STORMS THAT START TO POP UP IN THE AFTERNOON ALONG
THE SURFACE TROUGH IN THE ROCKIES AND THE ATTACHED FRONTAL BOUNDARY
THAT STRETCHES FROM NORTHWESTERN TO SOUTHEASTERN SD AND SHOWERS AND
STORMS WILL CONTINUE THIS PATTERN THROUGH THE NIGHT. HOWEVER, WITH
THE POTENTIAL FOR AN UPPER-LEVEL SHORTWAVE TO PROVIDE SUPPORT TO THE
STORMS AT SOME POINT AS WELL AS AN ENVIRONMENT CONDUCIVE TO SEVERE
STORMS IF THEY CAN BREAK THROUGH THE CAP, SOME STORMS COULD BECOME
SEVERE. LAPSE RATES LATE THIS AFTERNOON INTO TONIGHT WILL BE BETWEEN
7-8 C/KM AND BULK SHEAR WILL BE BETWEEN 35-45 KTS. WITH THIS
ENVIRONMENT IN PLACE, THERE IS A MARGINAL RISK (LEVEL 1 OF 5) FOR
STORMS TO BECOME SEVERE, WITH HAIL UP AROUND 1 INCH AND WIND GUSTS
OF 60 MPH POSSIBLE. CONFIDENCE IN TIMING FOR THESE STORMS IS LOW DUE
TO THE CAP THAT WILL BE IN PLACE AND NOT KNOWING WHERE AND WHEN
SOMETHING MIGHT BE ABLE TO BREAK THROUGH A WEAK POINT.
WHILE MOISTURE WILL CONTINUE TO MOVE IN OVER CENTRAL AND
NORTHEASTERN SD SUNDAY AND MONDAY, THE SURFACE TEMPERATURES WILL
COOL SLIGHTLY. HIGH TEMPERATURES THESE DAYS WILL BE IN THE LOW 80S
TO LOW 90S. INSTABILITY WILL START TO INCREASE AGAIN OVER CENTRAL SD
SUNDAY, WITH CAPE VALUES IN THE AFTERNOON INTO THE NIGHTTIME HOURS
BETWEEN 1000-2000 J/KG. AS MORE UPPER-LEVEL SHORTWAVES MOVE OVER SD,
THEY WILL BE ABLE TO PROVIDE SUPPORT FOR SHOWERS AND STORMS TO
CONTINUE TO DEVELOP ALONG THE SURFACE TROUGH AND FRONTAL BOUNDARY
THAT HAVE PARKED THEMSELVES OVER THE STATE. SLIGHTLY COOLER
TEMPERATURES ALOFT WILL HELP TO WEAKEN THE CAP SLIGHTLY, HOWEVER
WITH 850 TEMPERATURES STILL LOOKING TO BE BETWEEN 18-24 DEGREES C,
THERE WILL STILL BE A CAP TO LIMIT STORM DEVELOPMENT. AS WITH
YESTERDAY AND TODAY, THERE COULD BE JUNKY, PULSY SCATTERED SHOWERS
AND STORMS THROUGH THE AFTERNOON AND NIGHT IN THIS ENVIRONMENT.
LAPSE RATES LOOK TO BE SLIGHTLY WEAKER SUNDAY, BETWEEN 6-7 C/KM, AS
WELL AS A BIT WEAKER SHEAR OVER THE AREA COMPARED TO TODAY. IF A
STORM IS ABLE TO BREAK THROUGH THE CAP, THERE IS A MARGINAL CHANCE
(LEVEL 1 OF 5) IT COULD BECOME SEVERE SUNDAY AFTERNOON THROUGH THE
OVERNIGHT. THE PRIMARY HAZARDS WILL BE HAIL UP TO 1 INCH AND WIND
GUSTS OF 60 MPH. WHILE THE START OF MONDAY LOOKS TO HAVE SIMILAR
CONDITIONS, AN UPPER-LEVEL TROUGH WILL BE PUSHING THE RIDGE THAT
SITS OVER THE AREA OUT, WHILE ALSO PROVIDING SUPPORT FOR A COLD
FRONT TO PUSH THROUGH OVERNIGHT MONDAY INTO TUESDAY. THIS WILL HAVE
MORE STORMS ALONG IT, BUT ONCE THE FRONT PUSHES OUT OF CENTRAL AND
NORTHEASTERN SD, WE WILL FINALLY GET A LITTLE BREAK FROM THE PATTERN
WE HAVE BEEN STUCK IN AS WELL AS SOME COOLER TEMPERATURES.
AVIATION /12Z TAFS THROUGH 12Z SUNDAY/
ISSUED AT 628 AM CDT SAT SEP 5 2026
TERMINALS KABR,KATY,KPIR,KMBG
AREAS OF -SHRA/SHRA AND -TSRA/TSRA STILL LINGERING NEAR THE
KABR/KATY TERMINALS AT 12Z THIS MORNING, ALTHOUGH EXPECTING THIS
ACTIVITY TO DISSIPATE/DEPART THE REGION BY MID/LATE MORNING.
THERE ARE ALSO SOME PATCHES OF MVFR CIGS ACROSS NORTHEAST SD
WHICH COULD BRIEFLY AFFECT KABR/KATY THIS MORNING. FOR THIS
AFTERNOON, GENERALLY VFR CONDITIONS ARE FORECAST. THERE IS A
THREAT FOR ADDITIONAL TSRA ACTIVITY LATE THIS AFTERNOON INTO THE
NIGHTTIME HOURS, BUT CONFIDENCE ON AREAL COVERAGE AND LOCATIONS
OF THESE STORMS IS LOW. WILL DEFER TO LATER TAF ISSUANCES FOR
POSSIBLE INSERTION OF PROB30.
ABR WATCHES/WARNINGS/ADVISORIES
SD...NONE.
MN...NONE.
UPDATE...TMT
DISCUSSION...12
AVIATION...TMT
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