Weather forecasting

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Nowcasting

The forecasting of the weather in the 0-6 hour timeframe is often referred to as nowcasting. It is in this range that the human forecaster still has an advantage over computer NWP models. In this time range it is possible to forecast smaller features such as individual shower clouds with reasonable accuracy, however these are often too small to be resolved by a computer model. A human given the latest radar, satellite and observational data will be able to make a better analysis of the small scale features present and so will be able to make a more accurate forecast for the following few hours.

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Below is a sample nowcast, issued by the National Weather Service in Mount Holly, New Jersey:

Related Topics:
National Weather Service - Mount Holly, New Jersey

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000

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FPUS71 KPHI 240805

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NOWPHI

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SHORT TERM FORECAST

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NATIONAL WEATHER SERVICE MOUNT HOLLY NJ

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405 AM EDT FRI JUN 24 2005

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DEZ002>004-MDZ015-019-020-NJZ013-014-020-022>027-241200-

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ATLANTIC NJ-ATLANTIC COASTAL CAPE MAY NJ-CAPE MAY NJ-CAROLINE MD-

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COASTAL ATLANTIC NJ-COASTAL OCEAN NJ-DELAWARE BEACHES DE-

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EASTERN MONMOUTH NJ-INLAND SUSSEX DE-KENT DE-OCEAN NJ-

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QUEEN ANNE'S MD-SOUTHEASTERN BURLINGTON NJ-TALBOT MD-

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WESTERN MONMOUTH NJ-

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INCLUDING THE CITIES OF...ATLANTIC CITY AND DOVER

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405 AM EDT FRI JUN 24 2005

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.NOW...

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AREAS OF FOG AND LOW CLOUDS WILL BE OVER SOUTHERN DELAWARE AND

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PORTIONS OF THE NORTHEASTERN MARYLAND SHORE EARLY THIS MORNING, AS

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WELL AS ALONG THE NEW JERSEY COAST. THE PATCHY DENSE FOG MAY REDUCE

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THE VISIBILITY TO A QUARTER MILE OR LESS AT TIMES. IF YOU WILL BE

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DRIVING THIS MORNING, BE SURE TO LEAVE PLENTY OF ROOM BETWEEN YOUR

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VEHICLE AND THE ONE AHEAD OF YOU. YOUR VISIBILITY COULD DROP QUICKLY

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IF YOU DRIVE INTO A DENSE PATCH OF FOG. WATCH ESPECIALLY FOR

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PEDESTRIANS. THE FOG SHOULD DISSIPATE AN HOUR OR TWO AFTER SUNRISE.

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$$

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