Area Forecast Discussion
Issued by NWS Des Moines, IA

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FXUS63 KDMX 020827
AFDDMX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DES MOINES IA
327 AM CDT TUE SEP 2 2014

.SYNOPSIS...
ISSUED AT 317 AM CDT TUE SEP 2 2014

FAST MOVING S/WV WILL EXIT THE CWA THIS MORNING WITH HIGH PRESSURE
FOLLOWING TODAY. THE HIGH WILL MOVE TO THE EAST OF THE CWA
TONIGHT. A COLD FRONT WILL WILL MOVE INTO THE STATE THURSDAY AND
PASS TO THE SOUTHEAST BY FRIDAY. COOL HIGH PRESSURE WILL FOLLOW.

&&

.SHORT TERM /TODAY/...
ISSUED AT 317 AM CDT TUE SEP 2 2014

ANOTHER SHORTWAVE IS CURRENTLY MOVING INTO NORTHWEST IOWA AND WILL
PUSH ACROSS THE STATE THIS MORNING.  PRETTY DECENT VORT MAX EMBEDDED
IN THE WAVE AS WELL WHICH HAD FIRED CONVECTION OUT OVER NEBRASKA AND
SOUTH DAKOTA EARLIER IN THE EVENING.  THE STORMS HELD TOGETHER AND
AS THEY ENTERED WESTERN IOWA PRODUCED 40-50MPH WIND GUSTS.  THE GUST
FRONT OUTRAN THE STORMS AS THEY PUSHED INTO THE WESTERN FORECAST
AREA SO WIND ISN`T LOOKING AS IMPRESSIVE.  HOWEVER...THESE STORMS ARE
VERY PULSY AND WITH 50DBZ HEIGHTS BEING SIGNIFICANTLY LOWER TONIGHT
THAN THEY WERE THE PAST COUPLE OF NIGHTS THEY ARE BEING CLOSELY
WATCHED FOR THE POTENTIAL FOR LARGE HAIL.  A COUPLE STORMS HAVE COME
CLOSE.

ALL MODELS ARE IN DECENT AGREEMENT ON MOVING THE SHORTWAVE EAST
DURING THE MID TO LATE MORNING WITH CONVECTION WANING DURING THIS
TIME.  THE REST OF TODAY SHOULD BE DRY AND QUITE SUNNY.  HIGHS TODAY
WILL BE TRICKY.  WE HAVE CONSIDERABLY LOWER DEWPOINTS TODAY AND WITH
AMPLE SUN WE SHOULD WARM UP PRETTY NICELY BUT WITH A WEST TO
NORTHWEST COMPONENT TO THE WIND WE WILL LIKELY SEE TEMPS COMPARABLE
TO YESTERDAY.

.LONG TERM /TONIGHT THROUGH MONDAY/...
ISSUED AT 317 AM CDT TUE SEP 2 2014

WINDS WILL SWING TO THE SOUTH AS THE HIGH MOVES TO THE EAST OF THE
CWA TONIGHT. THETA-E ADVETION WILL BEGIN...BUT IT APPEARS IT WILL
BE LATE NIGHT BEFORE ISOLATED THUNDERSTORMS DEVELOP. AREA OF
ISOLATED TO SCATTERED THUNDERSTORMS WILL PUSH NORTHEAST DURING THE
DAY WED AS VERY HUMID AIRMASS RETURNS TO THE STATE.

THURSDAY LOOKS OT BE THE WARMEST DAY WITH DEW POINTS WILL INTO THE
70S. TEMPERATURES WILL BE HELD DOWN SOME BY A COMBINATION OF
FACTORS...INCLUDING WET ANTECEDENT CONDITIONS...LATE SEASON SUN
ANGLE...AND SOME LINGERING CLOUDINESS. WENT CLOSE TO 90 SOUTH WITH
80S NORTH. AIR MASS WILL BECOME CAPPED FOR A PERIOD OF TIME THU
INTO EARLY THURSDAY EVENING. TEMPS FALL OVERNIGHT AND WILL ALLOW
FOR A SQUALL LINE TO DEVELOP AHEAD OF THE COLD FRONT. UPPED POPS
TO THE LIKELY CATEGORY FRO THU NIGHT.

HIGH PRESSURE WILL PUSH THE MOISTURE SOUTH ON FRIDAY WITH
SIGNIFICANT COOLING EXPECTED FOR FRIDAY INTO EARLY NEXT WEEK WITH
TEMPS HOLDING BELOW NORMAL FOR SEVERAL DAYS.

&&

.AVIATION...02/06Z
ISSUED AT 1138 PM CDT MON SEP 1 2014

WEAK LINE OF CONVECTION SLOWLY DIMINISHING AS IT MOVES EAST INTO
WESTERN IOWA AND MAY CLIP MCW/FOD B/T 07-09Z. HIGH CLOUDS FROM MCS
OVER MISSOURI AND CLOUD COVER FROM AFOREMENTIONED STORMS SHOULD
HINDER THE DENSE FOG DEVELOPMENT OVERNIGHT. LEFT ANY MENTION OUT
ATTM. OTHERWISE...VFR CONDITIONS WILL PREVAIL.


&&

.DMX WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

$$

SYNOPSIS...MS SEP 14
SHORT TERM...FAB
LONG TERM...MS SEP 14
AVIATION...PODRAZIK



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