Area Forecast Discussion
Issued by NWS Hastings, NE

Home | Current Version | Previous Version | Graphics & Text | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
000
FXUS63 KGID 272104
AFDGID

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HASTINGS NE
404 PM CDT SUN JUL 27 2014

.SHORT TERM...(THIS EVENING THROUGH MONDAY)
ISSUED AT 404 PM CDT SUN JUL 27 2014

THE FORECAST IS DRY THROUGH THE SHORT TERM THEREFORE THE MAIN FOCUS
IS ON TEMPERATURES.  THE PATTERN ALOFT FEATURED NW FLOW ACROSS THE
INTERIOR CONUS WHILE AN UPPER RIDGE AXIS WAS BUILDING OVER THE
ROCKIES AND AN UPPER TROUGH WAS TRANSLATING SE THRU THE GREAT LAKES
REGION.  AT THE SURFACE...HIGH PRESSURE WAS BUILDING SE FM THE
WESTERN DAKOTAS AND A COOLER...DRIER AIRMASS WAS IN PLACE WITH AFTN
TEMPS AVERAGING IN THE 80S WITH DPS IN THE 50S.

THE UPPER TROUGH TO THE EAST WILL DEEPEN TONIGHT/MONDAY WITH COOLER
AIR BACKING INTO OUR REGION AND H85 TEMPS DROP ANOTHER DEGREE OR
TWO.  UNDER THE INFLUENCE OF THE SFC RIDGE TONIGHT AND THE DRY AIR
IN PLACE...LOWS ARE EXPECTED TO DROP TO THE 55 TO 60 DEGREE RANGE
WHICH WILL BE ABOUT FIVE DEGREES BELOW SEASONAL NORMALS.

HEADING INTO LATE TONIGHT OR EARLY MONDAY...MODELS INDICATE AN
INCREASE IN MID LEVEL MOISTURE/CLOUDS AND THE PRESENCE OF MID LEVEL
FRONTOGENESIS.  HAVE JUST INCREASED SKY GRIDS ATTM WITH MOISTURE
LACKING IN THE LOW LEVELS.  FOR THE START OF THE WORKWEEK...THE SFC
RIDGE WILL BUILDS ALONG THE MISSOURI RIVER AND WINDS WILL BE FAIRLY
LIGHT DURING THE DAY.  AFTERNOON HIGHS WILL AGAIN BE SIMILAR TO
TODAY WITH READINGS IN THE LOW/MID 80S.

.LONG TERM...(MONDAY NIGHT THROUGH SUNDAY)
ISSUED AT 404 PM CDT SUN JUL 27 2014

FOR THOSE WHO PREFERRED TODAYS WEATHER OVER THE HOT/SULTRY
CONDITIONS THAT PEAKED BACK ON FRIDAY-SATURDAY...THEN THIS 6-DAY
LONG TERM PERIOD IS FOR YOU. IN A NUTSHELL...THERE ARE CURRENTLY
NO 90+ DEGREE HIGHS FORECAST ANYWHERE IN THE CWA DURING THIS
TIME...WITH MOST DAYS PROGGED TO GENERALLY RANGE FROM LOW-MID 80S
NORTH TO MID-UPPER 80S SOUTH. OVERNIGHT LOWS ARE MAINLY AIMED INTO
THE LOW-MID 60S MOST NIGHTS...WITH SOME UPPER 50S LIKELY
ESPECIALLY IN NORTHERN ZONES EARLY IN THE WEEK. THE NET-RESULT
TEMP-WISE IS THIS 6-DAY PERIOD SHOULD GENERALLY AVERAGE AROUND 5
DEGREES BELOW NORMAL/AVERAGE...ESSENTIALLY SEALING WHAT WILL
LIKELY BE A TOP-10 COOLEST JULY ON RECORD FOR MUCH OF THE CWA. FOR
EXAMPLE...WITH SEVERAL DAYS LEFT TO GO TO DRAG THE AVERAGE MONTHLY
TEMPERATURE DOWN A BIT MORE...GRAND ISLAND AIRPORT IS ALREADY
SITTING ON ITS 17TH-COOLEST JULY ON RECORD OUT OF 119 YEARS.
ADDING TO THE GOOD NEWS FOR THOSE NOT A FAN OF OPPRESSIVE
DEWPOINTS/HUMIDITY...DEWPOINTS ARE FORECAST TO ONLY AVERAGE IN THE
MID-50S TO LOW-60S RANGE...WHICH IS PRETTY DARN COMFORTABLE BY
LATE-JULY/EARLY-AUGUST STANDARDS.

AS USUAL...CONFIDENCE IS A BIT HIGHER IN THE TEMPERATURE SITUATION
THAN RAINFALL CHANCES. THE BOTTOM LINE HERE IS THAT THERE ARE A
SMATTERING OF MAINLY LOW-END 20-30 POPS WITHIN VARIOUS PORTIONS OF
THE OUTLOOK AREA BETWEEN TUESDAY MORNING AND FRIDAY...WITH THE
OVERALL-HIGHEST (IF YOU WANT TO CALL IT THAT) CONCENTRATION OF
30-40 POPS WITHIN NORTH CENTRAL KS ZONES DURING THE TUESDAY
AFTERNOON-WEDNESDAY AFTERNOON TIME FRAME. AT LEAST FOR NOW...THE
UPCOMING WEEKEND IS VOID OF ANY PRECIP-MENTION...BUT THIS MAY BE
NO GUARANTEE TO STAY THIS WAY FOR ALL AREAS...AS FRIDAY NIGHT-SATURDAY
MAY EVENTUALLY WARRANT SOME SLIGHT POPS PER SOME MODELS. ON A
POSITIVE NOTE...SEVERAL MODELS AGREE THAT CONVECTIVE INSTABILITY
WILL BE QUITE MEAGER FOR THIS TIME OF YEAR...MAKING STRONG STORMS
UNLIKELY THIS ENTIRE TIME...LET ALONE SEVERE STORMS...BARRING
SUBSTANTIVE CHANGES. ON A SOMEWHAT NEGATIVE NOTE...WITH THE
MAJORITY OF THE CWA (ESPECIALLY NORTH OF THE STATE LINE
AREA) LIKELY STRUGGLING TO SEE RAINFALL TOTALS IN EXCESS OF ONE-
QUARTER INCH THROUGH NEXT WEEKEND...WHAT HAS ALREADY BEEN A WELL-
BELOW NORMAL MONTH OF PRECIPITATION FOR MOST OF THE CWA WILL
LIKELY PERSIST INTO EARLY AUGUST. ALTHOUGH FAR FROM SLIPPING BACK
INTO A SERIOUS DROUGHT SITUATION IN THE NEAR-TERM...THE OBVIOUS
IMPACTS OF THE SURPLUS OF JUNE MOISTURE CONTINUES TO SLOWLY FADE
AWAY.

BEFORE TAKING THINGS IN 12-24 HOUR BLOCKS AND ADDING SOME
METEOROLOGICAL DETAIL: THE MOST BASIC THEME THOUGH OF THIS 6-DAY
PERIOD IS A PREVAILING EASTERN CONUS TROUGH/WESTERN CONUS RIDGE
PATTERN.

MONDAY NIGHT...ALREADY RIGHT OFF THE BAT HERE THERE IS SOME
FORECAST UNCERTAINTY...AS ALTHOUGH CONFIDENCE IS HIGH IN DRY
WEATHER THROUGH THE EVENING HOURS...THE LATER NIGHT HOURS COULD BE
TRENDING TOWARD REALIZING SOME SPOTTY SHOWER ACTIVITY WITH MAYBE
EVEN A WEAK RUMBLE OF THUNDER. GIVEN THAT THE PREVIOUS FORECAST
WAS VOID OF ANY RAIN MENTION...OPTED TO TAKE A MIDDLE-GROUND
APPROACH FOR NOW AND ADD A GENERIC SLIGHT CHANCE OF SPRINKLES
CWA-WIDE FOR LATER IN THE NIGHT...AND DEFER TO LATER FORECASTS TO
SEE IF A MEASURABLE POP MIGHT BE WARRANTED. IN THE MID-UPPER
LEVELS...THE LOCAL AREA LIES ALONG THE INTERFACE BETWEEN A WESTERN
CONUS RIDGE CENTERED OVER THE SOUTHERN ROCKIES AND AN EXPANSIVE
TROUGH THAT ENVELOPES MUCH OF THE EASTERN CONUS FROM AN ANCHORING
CLOSED LOW CENTERED NEAR THE SOUTHERN TIP OF HUDSON BAY. THE KEY
FOR ANY SPOTTY PRECIP WILL BE A ZONE OF SOMEWHAT-SUBTLE MID LEVEL
ISENTROPIC LIFT SUCH AS EVIDENT AROUND 700 MILLIBARS AND ALSO THE
310K ISENTROPIC SURFACE. MODEL-WISE...QPF FIELDS FROM THE 18Z
NAM/12Z ECMWF AND ALSO SIMULATED REFLECTIVITY FROM THE 12Z 4KM
WRF-NMM CERTAINLY SUPPORT THE TREND TOWARD SOME SPOTTY SHOWER
POTENTIAL LATE MONDAY NIGHT...WHILE THE 12Z GFS REMAINED DRY. AT
THE SURFACE...LIGHT GENERALLY EASTERLY BREEZES WILL SETUP DURING
THE NIGHT. TEMP-WISE...DESPITE INCREASING MID LEVEL CLOUDS
LATE...SHOULD SEE A DECENT COOL-DOWN AND MAKE LITTLE CHANGE AIMING
FROM MID-UPPER 50S NORTHEAST TO LOW 60S SOUTHWEST.

TUESDAY DAYTIME-NIGHT...VERY LITTLE CHANGE IN THE LARGE-SCALE
PATTERN AS NORTHWESTERLY FLOW ALOFT PERSISTS BETWEEN THE
AFOREMENTIONED MEAN RIDGE AND TROUGH POSITIONS. EVEN IF WE MANAGE
TO GET THROUGH SUNRISE WITHOUT ANY SPOTTY PRECIP...THERE IS
CERTAINLY SUPPORT FOR AT LEAST SLIGHT POPS ON TUESDAY MORNING IN
MOST AREAS AS A CONTINUATION OF THE ISENTROPIC LIFT SIGNAL...AND
FOR 20-30 POPS IN MAINLY JUST THE SOUTHWEST HALF OF THE CWA DURING
THE AFTERNOON ALTHOUGH THE BULK OF THIS POTENTIAL ACTIVITY SHOULD
FOCUS FARTHER WEST OVER THE HIGH PLAINS. ON TUESDAY NIGHT...KEPT
20-30 POPS WITHIN MAINLY THE SOUTHWEST 2/3 OF THE CWA MAINLY TO
ACCOUNT FOR THE POSSIBILITY OF ACTIVITY TO THE WEST DURING THE
AFTERNOON SLIDING EASTWARD...BUT TRENDED DOWN THESE POPS ABOUT 10
PERCENT FROM PREVIOUS. BREEZES GENERALLY ONLY 5-10 MPH FROM THE
SOUTHEAST.

WEDNESDAY DAYTIME-NIGHT...PRETTY MUCH STATUS QUO NORTHWESTERLY
FLOW IN THE LARGE SCALE OVER THE CENTRAL PLAINS. THE COMBO OF LOW
LEVEL UPSLOPE FLOW INTERACTING WITH LOW AMPLITUDE SHORTWAVE
DISTURBANCES ALOFT WILL KEEP CONSIDERABLY HIGHER PRECIP CHANCES
GOING ALONG AN AXIS FROM COLORADO THROUGH WESTERN INTO SOUTHERN
KS...LEAVING THE LOCAL AREA MAINLY ALONG THE FAR
NORTHERN/NORTHEASTERN FRINGES OF THIS RAIN POTENTIAL...MEANING
THERE IS PLENTY OF UNCERTAINTY ABOUT HOW MUCH GETS IN...BUT WITH
THE BEST CHANCES FOCUSED IN OUR NORTH CENTRAL KS ZONES. TONED DOWN
POPS ABOUT 10 PERCENT FROM PREVIOUS FORECAST...BUT STILL LEFT A
DECENT COVERAGE OF 30-40 POPS IN THE FAR SOUTH DURING THE DAY AND
A BIT LOWER AT NIGHT.

THURSDAY DAYTIME-NIGHT...AGAIN STATUS QUO NORTHWESTERLY FLOW.
ALTHOUGH MODELS ARE LOOKING MAINLY DRY ALL AREAS...MAINTAINED SOME
VERY LOW-CONFIDENCE SLIGHT POPS IN SOUTHERN ZONES DURING THE DAY
AND EASTERN ZONES AT NIGHT.

FRIDAY DAYTIME-NIGHT...THE CENTRAL PLAINS REMAINS SANDWICHED
BETWEEN THE MEAN RIDGE WEST AND MEAN TROUGH EAST. MAINLY PER THE
GFS ALLOWED SOME SLIGHT POPS TO PERSIST FOR AT LEAST ONE MORE
FORECAST CYCLE IN EASTERN ZONES DURING THE DAY. AT NIGHT...LEFT
DRY DESPITE THE GFS QPF SUGGESTING POPS MAY NEED ADDED AT A LATER
TIME.

SATURDAY DAYTIME-SUNDAY DAYTIME...AT LEAST FOR NOW HAVE KEPT ANY
RAIN CHANCES OUT OF THE FORECAST...BUT THERE ARE HINTS THAT AT
LEAST SOUTHERN ZONES MAY EVENTUALLY NEED SLIGHT POPS CONSIDERED
FOR SATURDAY. CERTAINLY PLENTY OF TIME FOR LIKELY ALTERATIONS
HERE. OTHERWISE...THE SAME LARGE-SCALE PATTERN THAT DEFINES THE
WHOLE WEEK GENERALLY REMAINS IN PLACE...HENCE RESULTING IN THE
REMARKABLY CONSISTENT TEMPERATURES FORECAST THROUGHOUT THIS ENTIRE
6-DAY PERIOD.

&&

.AVIATION...(FOR THE 18Z TAFS THROUGH 18Z MONDAY AFTERNOON)
ISSUED AT 1200 PM CDT SUN JUL 27 2014

HIGH PRESSURE WILL BUILD SOUTHEAST ACROSS THE CENTRAL PLAINS INTO
MONDAY WITH DRY AND COOLER CONDITIONS SETTLING IN. WINDS WILL BE
FROM A NORTHERLY DIRECTION WITH STEADY WINDS IN THE AFTN
DECREASING TONIGHT. MODELS INDICATE AN INCREASE IN MID LEVEL CLOUD
COVER LATE TONIGHT OR MONDAY MORNING.

&&

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

$$

SHORT TERM...FAY
LONG TERM...PFANNKUCH
AVIATION...FAY



USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.