Area Forecast Discussion
Issued by NWS Goodland, KS

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000
FXUS63 KGLD 260821
AFDGLD

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GOODLAND KS
221 AM MDT SAT JUL 26 2014

.UPDATE...
ISSUED AT 846 PM MDT FRI JUL 25 2014

RADAR TRENDS OVER THE LAST HOUR HAVE SHOWN AN INCREASE IN
INTENSITY OF THE LINE OF STORMS MOVING EASTWARD. LOOKING AT RUC
SOUNDINGS FOR TRIBUNE THE BEST ELEVATED INSTABILITY IS ABOVE
700MB...WITH A BULLS EYE OF NEAR 1500J/KG OF CAPE JUST WEST OF THE
KS/CO LINE IN EASTERN CHEYENNE COUNTY. THIS INSTABILITY DRIFTS
SOUTH-SOUTHEAST OVER THE NEXT COUPLE OF HOURS BEFORE DISSIPATING.
MEANWHILE THE ELEVATED CAPE WILL LINGER UNTIL AROUND MIDNIGHT THEN
END AS THE ENVIRONMENT STABILIZES.

&&

.SHORT TERM...(THIS AFTERNOON THROUGH SATURDAY)
ISSUED AT 112 PM MDT FRI JUL 25 2014

EARLY AFTERNOON WV IMAGERY AND RAP UPPER LEVEL ANALYSIS SHOW BROAD
RIDGE STILL IN PLACE FROM THE DESERT SW ACROSS THE SOUTHERN
PLAINS...WITH A PLUME OF MID-UPPER LEVEL MOISTURE AND WEAK VORTICITY
ROTATING AROUND THE NORTHERN PERIPHERY OF THIS RIDGE ACROSS THE
CENTRAL ROCKIES INTO THE HIGH PLAINS. A CLOSED LOW IS MOVING ACROSS
SOUTHERN CANADA WITH SOME WEAK REFLECTION OF THIS EXTENDING FURTHER
SOUTH INTO THE NORTHERN PLAINS. AT THE SURFACE A WEAK COLD FRONT HAS
STALLED OVER THE SOUTHERN PART OF OUR CWA...WITH FAVORABLE JULY
SOLAR ANGLE SUPPORTING GOOD RADIATIONAL WARMING THIS AFTERNOON AS
HIGHS HAVE STILL REACHED THE MID TO UPPER 90S OVER MUCH OF THE CWA
(A LITTLE COOLER TOWARDS THE NW).

STALLED FRONT IN THE SOUTH COMBINED WITH ELEVATED TERRAIN IN
COLORADO SHOULD HELP INITIATE THUNDERSTORMS (WHICH HAVE ALREADY
DEVELOPED ALONG FRONT RANGE). HIGH LCL/LFC OVER OUR CWA SHOULD KEEP
THUNDERSTORM ACTIVITY ELEVATED AND WITH INCREASING INSTABILITY AND
DCAPE WOULD SUPPORT POTENTIAL FOR DOWNBURSTS. IF UPDRAFTS ARE STRONG
ENOUGH...MAYBE LARGE HAIL WOULD BE POSSIBLE THIS
AFTERNOON/EVENING...HOWEVER WITH VERY WARM LOW-MID LEVELS ABOVE
SHALLOW FRONTAL INVERSION CONDITIONS ARE MORE IN LINE WITH A WIND
THREAT. GUIDANCE CONTINUES TO SHOW BETTER COVERAGE OVER
CWA...HOWEVER DESPITE GOOD SURFACE-BL MOISTURE ALONG FRONTAL ZONE
AIR MASS ITSELF IS FAIRLY DRY AND COVERAGE IS A QUESTION. BEST
FORCING WOULD ACTUALLY BE LATER IN THE EVENING AS SHORTWAVE (ALONG
WITH POSSIBLE OUTFLOW FROM POSSIBLE MCS IN THE NORTH) MOVES INTO THE
CWA. AT THIS POINT I WAS COMFORTABLE KEEPING COVERAGE ISOLATED AND
DELAYED EXIT UNTIL AFTER 06Z. WILL NEED TO MONITOR TRENDS AS WESTERN
LOCATIONS COULD SEE SLIGHTLY BETTER COVERAGE BEFORE SUNSET.

DEEPENING ON EVOLUTION OF OUTFLOW (AS INDICATED BY NAM) OR WEAK
FRONTAL PASSAGE SATURDAY TEMPS COULD BE TRICKY ONCE AGAIN AS HEIGHTS
AND PATTERN ALOFT WOULD GENERALLY SUPPORT GOOD DAYTIME HEATING AND A
RECOVERY OF THE AIR MASS IN PLACE. I KEPT TEMPS SIMILAR TO TODAY
WITH ABOVE NORMAL VALUES IN THE 90S (AROUND 100F IN THE EAST). HIGH
BASED THUNDERSTORMS MAY DEVELOP AGAIN SATURDAY AFTERNOON ALONG
FRONTAL ZONE IN THE SOUTH...HOWEVER CONFIDENCE IS LOW ON EARLIER
INITIATION OVER OUR CWA...WITH FLOW MORE SUPPORTIVE OF UPSTREAM
DEVELOPMENT IN COLORADO.

.LONG TERM...(TUESDAY THROUGH FRIDAY)
ISSUED AT 221 AM MDT SAT JUL 26 2014

HIGH PRESSURE AT 500 AND 700 MB WILL BE PRESENT OVER THE TRI STATE
AREA IN THE LONG TERM PERIOD WITH MAIN JET FLOW WELL TO THE NORTH OF
THE REGION.  DESPITE THE LACK OF FORCING THAT WILL BE PRESENT
ALOFT...PLENTY OF MOISTURE WILL BE PRESENT WITH PRECIPITABLE WATER
AMOUNTS FROM THE GFS BETWEEN 1.25 AND 1.6 INCHES FOR THE DURATION OF
THE LONG TERM PERIOD. THE ECMWF ALSO HAS BETWEEN 1.25 AND 1.5 INCHES
OF PRECIPITABLE WATER FOR TUESDAY AND WEDNESDAY...AND THEN BRINGS IN
MORE DRY AIR ALOFT FOR LATER IN THE WEEK. THEREFORE...THE
POTENTIAL FOR SOME HEAVY RAINFALL WILL EXIST AREA WIDE.

A LOW PRESSURE SYSTEM DEVELOPING IN THE SOUTHERN PLAINS IN
COMBINATION WITH SOME SURFACE CONFLUENCE IN EASTERN COLORADO WILL
BRING CHANCES FOR THUNDERSTORMS TUESDAY THROUGH THURSDAY.  THE
POTENTIAL FOR DRY AIR MOVING IN ALOFT WILL DECREASE CHANCES FOR
THUNDERSTORMS ON FRIDAY...HOWEVER SURFACE THETA E VALUES BETWEEN 330
AND 350 K ARE STILL PLENTY TO SUPPORT SOME STORMS THAT MAY DEVELOP.
INSTABILITY IS NOT TOO IMPRESSIVE WITH CAPE VALUES BELOW 1000 J/KG
FOR BOTH THE GFS AND ECMWF...BUT IS STILL SUFFICIENT ENOUGH TO
SUPPORT SOME CONVECTIVE DEVELOPMENT.

NORTHWEST FLOW ALOFT WILL KEEP CONDITIONS AT THE SURFACE A BIT
COOLER THAN AVERAGE DURING THIS PERIOD...WITH HIGH TEMPERATURES IN
THE LOW TO MID 80S ACROSS THE AREA. LOW TEMPERATURES SHOULD BE RIGHT
ABOUT NORMAL IN THE LOWER 60S.

&&

.AVIATION...(FOR THE 06Z TAFS THROUGH 06Z SATURDAY NIGHT)
ISSUED AT 1140 PM MDT FRI JUL 25 2014

VFR CONDITIONS FORECAST FOR THE 6Z TAFS. AREA OF THUNDERSTORMS
SHOULD CONTINUE TO MOVE EASTERLY AND REMAIN SOUTH OF THE KMCK
SITE. AM THINKING THERE COULD BE A THREAT FOR FOG...ESPECIALLY
WHERE RAINFALL HAS OCCURRED. HOWEVER WILL KEEP A MENTION OF FOG
OUT OF THE KGLD TAF FOR NOW DUE TO LOWER DEW POINTS MOVING IN
THROUGH THE REST OF THE NIGHT. OTHERWISE A COLD FRONT WILL MOVE
THROUGH MID MORNING WITH WINDS BECOMING BREEZY BEHIND IT. DURING
THE AFTERNOON AN UPPER LEVEL SHORT WAVE TROUGH MOVES ACROSS THE
AREA SOUTH OF KGLD WHICH MAY SPARK A FEW STORMS OFF. THIS ACTIVITY
SHOULD REMAIN SOUTH OF THE SITE.


&&

.GLD WATCHES/WARNINGS/ADVISORIES...
KS...NONE.
CO...NONE.
NE...NONE.
&&

$$

UPDATE...JTL
SHORT TERM...DR
LONG TERM...MK
AVIATION...JTL






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