Preliminary Forecasts
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FXUS02 KWNH 100538
PREEPD

PRELIMINARY EXTENDED FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
137 AM EDT THU JUL 10 2014

VALID 12Z SUN JUL 13 2014 - 12Z THU JUL 17 2014


A HIGHLY ANOMALOUS AMPLIFICATION OF THE FLOW ACROSS NORTH AMERICA
IS INDICATED BY THE GLOBAL NUMERICAL MODELS AT THE MEDIUM RANGE.
THE EUROPEAN CENTRE ENSEMBLE MEAN HAS BEEN THE STEADIEST OF THE
MEANS FROM THE VARIOUS MODELING CENTERS OVER THE PAST FEW DAYS OF
DATA CYCLES. THE STABILITY OF THE ECENS MEAN, ALONG WITH THE SLOW
CONVERGENCE OF THE OTHER GLOBAL MODELS TOWARDS IT, CONTINUE TO
PREPOSSESS RELIANCE UPON ITS MASS FIELDS AS SYNOPTIC GUIDANCE.

THE FULL-LATITUDE RIDGE OVER THE WEST IS EXPECTED TO SEND
TEMPERATURES SOARING OVER EASTERN WASHINGTON AND THE ADJACENT
LOWLANDS OF OREGON AND IDAHO. AFTERNOON HIGHS MAY WELL RANGE
BETWEEN 100F AND 110F FOR MUCH OF THE PERIOD. IN THE EAST, A
BONAFIDE POLAR VORTEX APPEARS DESTINED TO NESTLE INTO ONTARIO AND
QUEBEC, DELIVERING REMARKABLY COOL, DRY AIR INTO MUCH OF THE
CENTRAL UNITED STATES. SOME OF THE GREATEST NEGATIVE ANOMALIES ARE
LIKELY TO BE JUST NORTH OF THE POLAR FRONT ONCE IT SETTLES INTO
THE DEEP SOUTH--IN THE CLOUDY, RAINY ZONE WHERE THE PRECIPITATION
WILL SEND THE DRY-BULB READINGS TOWARD THE WET-BULB VALUES. SUCH A
SYNOPTIC SET-UP IS THE VERY RECIPE FOR RECORD LOW MAXIMUM
TEMPERATURES DURING WHAT IT CLIMATOLOGICALLY THE HOTTEST TIME OF
THE YEAR.


CISCO

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