Preliminary Forecasts
Issued by NWS

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FXUS02 KWNH 150515
PREEPD

PRELIMINARY EXTENDED FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
114 AM EDT MON SEP 15 2014

VALID 12Z THU SEP 18 2014 - 12Z MON SEP 22 2014


...CONTINUED THREAT FOR TROPICAL DOWNPOURS IN THE SOUTHWEST...


THE 12Z/14 ECENS MEAN OFFERS THE MOST ROBUST CONTINUITY OF THE
RECENT GLOBAL NUMERICAL GUIDANCE, AND OFFERS A SMOOTH TRANSITION
WITH THE PROGRESSION OF LONGWAVES ACROSS CENTRAL NORTH AMERICA AT
THE MEDIUM RANGE. THE PROGRESSIVE PATTERN MEANS TRENDING
TEMPERATURES THROUGHOUT THE PERIOD, WITH RAINFALL FOCUSING ALONG
THE MEANDERING POLAR FRONT--PARTICULARLY OVER THE CENTRAL PLAINS.

A SPECIAL FOCUS SEEMS MERITED OVER THE FAR SOUTHWEST, WHERE
TROPICAL MOISTURE IS ONCE AGAIN POISED TO FLOW INTO THE REGION AS
THE MID-LATITUDE TROUGH OFF THE UNITED STATES WEST COAST KICKS
INLAND. VERY HIGH PRECIPITABLE-WATER VALUES MAY WELL BE WRUNG OUT
BY A SERIES OF SMALL-SCALE SHORTWAVES WIGGLING NORTHWARD FROM THE
GULF OF CALIFORNIA.


CISCO

$$




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