Area Forecast Discussion
Issued by NWS Des Moines, IA

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FXUS63 KDMX 131203
AFDDMX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DES MOINES IA
703 AM CDT SUN JUL 13 2014

.SYNOPSIS...
ISSUED AT 326 AM CDT SUN JUL 13 2014

FIRST COLD FRONT HAS MOVED SOUTH OF THE CWA WITH SECONDARY ON THE
WAY. EXPECT TO SEE THAT MOVE SOUTH ACROSS THE STATE TONIGHT.
CANADIAN HIGH PRESSURE WILL FOLLOW AND DOMINATE FOR MUCH OF THE
REST OF THE WEEK.

&&

.SHORT TERM /TODAY/...
ISSUED AT 326 AM CDT SUN JUL 13 2014

GIVEN LIGHT WINDS AND AMPLE LOW LEVEL MOISTURE DUE TO SATURDAY
PRECIPITATION...AREAS OF FOG WILL BE PRESENT AT SITES THROUGH EARLY
MORNING HOURS. CURRENT TRENDS INDICATE THAT DENSE FOG WILL BE
TRANSIENT AND PATCHY IN NATURE...AND FOR NOW WILL NOT ISSUE A DENSE
FOG ADVISORY...THOUGH WILL CONTINUE TO MONITOR IN CASE CONDITIONS
DETERIORATE AND ADVISORY BECOMES NECESSARY.

FOR REMAINDER OF THE DAY...LARGE UPPER LEVEL LOW PRESSURE SYSTEM IN
CANADA WILL BEGIN TO DROP SOUTH THROUGHOUT THE DAY. THIS WILL SPREAD
A WEAK FRONTAL BOUNDARY INTO CENTRAL IOWA...AND HAVE KEPT ISOLATED
THUNDER MENTION WITH THIS SYSTEM. OTHERWISE...TEMPERATURES WILL BE
COOLER AS COOL AIR BEGINS TO SPILL IN WITH LOW.

.LONG TERM /TONIGHT THROUGH SATURDAY/...
ISSUED AT 326 AM CDT SUN JUL 13 2014

SCATTERED SHOWERS ARE EXPECTED ACROSS THE CWA TONIGHT AS THE
SECONDARY COLD FRONT MOVES THROUGH. THE DYNAMICS ARE WEAK AND DO
NOT EXPECT MUCH IN THE WAY OF COVERAGE OR AMOUNTS OUT OF THESE. A
STRONG S/WV WILL ROTATE ACROSS THE CWA ON MON AND WILL BRING SOME
INSTABILITY SHOWERS...ESPECIALLY DURING PEAK HEATING OF COLD
AIRMASS.

AS FOR THE REST OF THE WEEK...CANADIAN HIGH PRESSURE WILL DOMINATE
THE REST OF THE WEEK. MIN TEMPS WILL BE CLOSE TO RECORD LOWS FOR
BOTH TUE AND WED MORNINGS. ON TUE THE COLDEST AIR WILL PASS OVER
THE STATE...HOWEVER...HIGH PRESSURE AND CALM WINDS ARE EXPECTED ON
WED MORNING YIELDING TEMPS ABOUT AS COLD AS TUE MORNING. THE REST
OF THE WEEK WILL BRING A SLOW MODERATION...TOUGH TEMPS WILL REMAIN
BELOW NORMAL THROUGH THIS FORECAST PERIOD. THE NEXT CHANCE FOR
RAINFALL WILL COME LATE IN THE FORECAST PERIOD AS THE NEXT TROUGH
OVERTOPS THE RIDGE AND PASSES THROUGH NEXT WEEKEND.

&&

.AVIATION...13/12Z
ISSUED AT 615 AM CDT SUN JUL 13 2014

IFR AND LIFR FG AND BR AT SITES NEAR 12Z WILL LIFT QUICKLY AS SUN
RISES. WINDS WILL BE FROM THE NORTHWEST...WITH GUSTS POSSIBLE IN
THE AFTERNOON. CONDITIONS WILL BE VFR THROUGH MUCH OF
PERIOD...THOUGH ADDITIONAL BR/FG MAY BE POSSIBLE AT SITES AFTER
06Z AGAIN AS WINDS BECOME LIGHT AND VARIABLE AND AMPLE LOW LEVEL
MOISTURE REMAINS. HAVE ONLY TRENDED CEILINGS LOWER ATTM.


&&

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

&&

$$

SYNOPSIS...MS JUN 14
SHORT TERM...AWB
LONG TERM...MS JUN 14
AVIATION...AWB


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