Area Forecast Discussion
Issued by NWS Hastings, NE

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000
FXUS63 KGID 180549
AFDGID

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HASTINGS NE
1249 AM CDT THU SEP 18 2014

.SHORT TERM...(THIS EVENING THROUGH THURSDAY)
ISSUED AT 253 PM CDT WED SEP 17 2014

FOCUS IS ON THE POTENTIAL FOR FOG AND TSTM DEVELOPMENT TONIGHT.

THE PATTERN ALOFT FEATURED AN UPPER RIDGE AXIS OVER THE ROCKIES...A
TROUGH MOVING INTO THE WEST COAST...WEAKENING ODILE LIFTING INTO
SOUTHERN AZ/NM AND NW FLOW ACROSS THE CENTRAL PLAINS.  TEMPS HAVE
BEEN ON THE INCREASE THIS AFTN ONCE STRATUS FINALLY ERODED ACROSS
OUR SOUTHERN ZONES...WITH READINGS AVERAGING IN THE UPPER 70S TO
LOWER 80S.

THE FIRST PART OF TONIGHT IS LOOKING UNEVENTFUL...HOWEVER AFTER
DARK...CHANCES FOR TSTMS INCREASE AS ENERGY TRANSLATES EAST OF
THE ROCKIES ONTO THE PLAINS AND MID LEVEL WAA INCREASES AIDED BY A
STRENGTHENING LLVL JET. A NARROW MOISTURE AXIS IS EXPECTED TO
DEVELOP ALONG OUR WESTERN ZONES AND IN EASTERLY LLVL FLOW WITH
LIGHT WINDS...EXPECT LOW CLOUDS TO AGAIN DEVELOP TOWARD DAYBREAK.
MODELS ARE PRETTY ROBUST WITH LOW VSBY PROGS IN FOG AND HAVE WENT
WITH MORE AREAS VS PATCHY FOG DEVELOPMENT. WILL NEED TO MONITOR
VSBY TRENDS THROUGH THE EVENING BUT ESPECIALLY OVERNIGHT AS SOME
AREAS MAY SEE DENSE FOG. HOW LOW VSBYS DROP WILL ALSO BE DEPENDENT
UPON ON QUICKLY WINDS TRANSITION FROM EASTERLY TO
SOUTHEAST/SOUTHERLY THURSDAY MORNING WITH WIND SPEEDS PICKING UP
BY MID/LATE MORNING. BASED ON STRATUS/FOG TIMING EARLIER
TODAY...THE VSBY IMPROVEMENT WAS MORE TOWARD 14Z SO WENT WITH
SIMILAR TIMING FOR THURS. THERE IS STILL SOME CONCERN ON HOW MUCH
OF THIS WILL BE FOG VS TSTM VS DRIZZLE AND HAVE LEFT DRIZZLE OUT
DUE TO HAVING POPS IN THERE FOR STORMS. IF STORMS GO...A STRONG
STORM CAPABLE OF PRODUCING NICKEL HAIL SIZE HAIL DUE TO PRESENCE
OF INSTABILITY OF 1500 J/KG AND 40KTS OF SHEAR.

THURSDAY IS COMPLICATED DUE TO HOW LONG STRATUS WILL HOLD AND IF IT
HOLDS THRU MUCH OF THE DAY...IT WILL HAVE AN IMPACT ON TEMPS.
HAVE WENT WITH A MORE PESSIMISTIC FORECAST AS MODELS HOLD ONTO
LLVL MOISTURE INTO THE AFTN AND HAVE LOWERED MAX TEMPS AND
INCREASED CLOUD COVER.

.LONG TERM...(THURSDAY NIGHT THROUGH WEDNESDAY)
ISSUED AT 253 PM CDT WED SEP 17 2014

PATTERN: THE NEXT TWO WEEKS ARE LOOKING VERY DRY HERE...PRIMARILY
ONCE WE GET PAST SAT. THAT DOES NOT MEAN IT WON`T RAIN...JUST THAT
CONDITIONS GENERALLY WILL BE UNFAVORABLE FOR DECENT RAINFALL AND THE
PROBABILITY WILL BE HIGH FOR A LONG STRETCH WITH NO RAIN. MULTI-DAY
500 MB ENSEMBLE MEANS FROM NCEP/ECMWF/MSC/JMA ALL INDICATE HIGH
PREDICTABILITY IN A NE PACIFIC TROF/WRN USA RIDGE WITH NW FLOW HERE
OVER THE PLAINS. WHILE THIS IS A DRY PATTERN...IT WILL BE
WONDERFULLY WARM AT TIMES AS WE TUSSLE BETWEEN THE LAST VESTIGES OF
SUMMER AND ONCOMING AUTUMN. THERE WILL BE POTENTIAL FOR A 90F DAY OR
TWO IN THE TRI-CITIES.

ALOFT: THE RIDGE CURRENTLY OVER THE WRN USA WILL ADVANCE E OVER THE
PLAINS BY 00Z/FRI AS THE LOW OFF CA MOVES INLAND. SIGNIFICANT
AMPLIFICATION WILL TAKE PLACE OVER N AMERICA THIS WEEKEND AS HEIGHTS
FALL OVER THE NE PACIFIC. THIS WILL SEND ANOTHER SERIOUS SPELL OF
BELOW NORMAL CHILL NEXT WEEK. THE RIDGE WILL REMAIN OVERHEAD FRI BUT
BECOMES QUASHED SAT AS THE LONGWAVE TROF DIGS OVER THE ERN USA. THE
WRN USA RIDGE WILL BE SHOVED TEMPORARILY E INTO THE CNTRL USA NEXT
TUE-WED...ALONG WITH THE EMBEDDED LOW THAT WILL MOVES INLAND IN THE
W TOMORROW. THIS LOW WILL BE A FCST PROBLEM AND COULD CONTRIBUTE TO
A DAY OR TWO OF MUCH BELOW NORMAL CHILL.

ANOTHER COMPLICATION WILL BE THE REMNANTS OF ODILE /CURRENTLY MOVING
INTO AZ/NM.

SURFACE: ERN USA HIGH PRES WILL LOSE ITS INFLUENCE OVER THE REGION
AS A COLD FRONT SAGS ACROSS CANADA AND THE NRN USA FRI-SAT. THIS
FRONT WILL SLIP THRU HERE SAT NIGHT. CANADIAN HIGH PRES WILL THEN
BUILD IN SUN-TUE AS IT PRESSES SE INTO THE ERN USA.

THE DAILY DETAILS...

THU NIGHT: A MILD NIGHT. BREEZY AT TIMES. WE HAVE SEEN A LOT OF FALL-
LIKE CHILL THIS MONTH. TEMPS WILL BE THE WARMEST IN A WEEK FOR SURE
AND POSSIBLY ALL THE WAY BACK TO SEP 3RD.

FRI: WARM SECTOR. SUNNY/BREEZY AND VERY WARM JUST AHEAD OF THE
APPROACHING LEE-SIDE TROF. THIS WILL BE THE WARMEST DAY WE`VE SEEN
IN OVER A WEEK. NOT OUT OF THE QUESTION ONE OF THE TRI-CITIES COULD
BRIEFLY TOUCH 90F FOR AN HOUR. BEST CHANCE AT KEARNEY. CAN`T RULE
OUT A VERY LATE AFTERNOON TSTM N OF NEB HWY 92 AS THE FRONT EASES IN
FROM THE N.

USED A 50-50 BLEND OF THE MAV AND 4KM NAM 2M DEWPOINTS FOR 21Z AS
THEY HAVE BEEN CONSISTENTLY VERIFYING BEST AND OUR DEWPOINT
PERFORMANCE HAS BEEN LOW AT 57 HRS.

FRI NIGHT: SHORTWAVE TROF WITH THE LEE-SIDE TROF AND APPROACHING
FRONT WILL RESULT IN SCATTERED CLUSTERS OF TSTMS...PRIMARILY AFTER
MIDNIGHT. MUCAPE 1000-2000 J/KG. EFFECTIVE DEEP LAYER SHEAR 40-50
KTS. THIS COULD RESULT IN STRONG-SEVERE TSTMS. PROBABLY NOT
WIDESPREAD AND CONFIDENCE IS ONLY AVERAGE.

SAT: SOME TSTMS OR TSTM CLUSTERS WILL PROBABLY LINGER AS THE
SHORTWAVE TROF DEPARTS. SOME HELP VIA THE REMNANTS OF ODILE COULD
OCCUR OVER PARTS OF KS. THIS ACTIVITY /EVEN IF IT DOES NOT MAKE IT
INTO OUR N-CNTRL KS COUNTIES/ COULD PUT A SIGNIFICANT CAP ON TEMPS.
NOT SURE WE HAVE THIS HANDLED PROPERLY YET. BACK TO NORMAL ON THE
TEMPS...EXCEPT THIS POSSIBLE SNAG.

SUN: SUNNY AND VERY NICE WITH LIGHT WINDS. TEMPS NEAR NORMAL.

MON: SUNNY WITH TEMPS DROPPING COOLER THAN NORMAL BUT STILL VERY
PLEASANT.

TUE-WED: WARM SECTOR WITH A WARM FRONT DEVELOPING OVER THE REGION.
CLUSTERS OF LLJ WAA-DRIVEN TSTMS. TEMPS HIGHLY DEPENDENT UPON CLOUD
COVER.

&&

.AVIATION...(FOR THE 06Z TAFS THROUGH 06Z THURSDAY NIGHT)
ISSUED AT 1242 AM CDT THU SEP 18 2014

MAIN FORECAST CONCERN THROUGH THIS TAF PERIOD LIES THROUGH THE
REST OF TONIGHT/EARLY MORNING HOURS...WITH DROPPING CEILINGS AND
FOG. SHORT TERM MODELS AND GUIDANCE...TO VARYING
DEGREES...CONTINUE TO SHOW CONDITIONS DETERIORATING WITH TIME AS
WE GET CLOSER TO SUNRISE. HAVE MVFR/IFR CONDITIONS GOING AT BOTH
TERMINAL SITES...WILL ADJUST ONCE THINGS DEVELOP AND CAN GET A
BETTER FEEL FOR JUST HOW BAD CONDITIONS LOOK TO GET. VFR
CONDITIONS ARE EXPECTED TO RETURN BY LATE MORNING AND CONTINUE
THROUGH THE REMAINDER OF THE TAF PERIOD. NO SIGNIFICANT CHANGES IN
WINDS...WHICH REMAIN GENERALLY SERLY.

&&

.GID WATCHES/WARNINGS/ADVISORIES...
NE...NONE.
KS...NONE.
&&

$$

SHORT TERM...FAY
LONG TERM...HALBLAUB
AVIATION...ADP


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