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ZCZC NFDSPENES ALL SPENES HIZ000- . SATELLITE PRECIPITATION ESTIMATES..DATE/TIME 04/11/19 2156Z SATELLITE ANALYSIS BRANCH/NESDIS---NPPU---TEL.301-683-1404 LATEST DATA USED: GOES 17 VIS 2146Z; FCS . LOCATION...BIG ISLAND OF HAWAII... . ATTN WFOS...HFO... ATTN RFCS...AKRFC... . EVENT...DEVELOPING CONVECTION OVER THE BIG ISLAND . SATELLITE ANALYSIS AND TRENDS...GOES 17 VISIBLE SATELLITE IMAGERY SHOWS GROWING THUNDERSTORMS SUPPORTED BY METAR OBSERVATIONS AT PHTO REPORTING HEAVY RAIN EARLIER. ALTHOUGH THE CENTER OF THE STORM IS FARTHER AWAY, THE COUNTERCLOCKWISE FLOW AROUND THE STORM HAS RESULTED IN UPWARD FORCING AND DEVELOPMENT OF CONVECTION OVER THE BIG ISLAND OF HAWAII THAT IS EVOLVING ON SATELLITE IMAGERY. STEEP TOPOGRAPHY AND LOW LEVEL WINDS FROM AN EASTERLY DIRECTION IS FORCING MOISTURE UPWARDS AS UPPER LEVEL WINDS REMOVE MASS ALOFT EVIDENCED BY CIRRUS CLOUDS DRIFTING TO THE SOUTHEAST ON NORTHWESTERLY WINDS ALOFT INDICATED ON THE LATEST SATELLITE IMAGES; THEREFORE, THE OPPORTUNITY EXISTS FOR LONGER LIVED THUNDERSTORMS TO PRODUCE HEAVIER RAINFALL OVER AN EXTENDED PERIOD AS FLASH FLOODING BECOMES AN INCREASING THREAT OVER HAWAII. . SHORT TERM OUTLOOK VALID 2156-0256Z...HIGHER CONFIDENCE FACTOR IN SHORT TERM OUTLOOK...DEVELOPING THUNDERSTORMS OVER THE BIG ISLAND AT THE MOMENT ARE CAPABLE OF PRODUCING HEAVY RAINFALL AND POTENTIAL FLASH FLOODING. CANYONS AND VALLEYS ARE SUSCEPTIBLE TO THE CHANNELING OF WATER FROM STORMS OVER THE MOUNTAINS. RADAR OVER THE BIG ISLAND DOES NOT CAPTURE THE DEVELOPING CELLS DUE TO BLOCKING OF THE RADAR SIGNAL. . ....NESDIS IS A MEMBER OF NWSCHAT (NESDISSATELLITEPRECIP).... ....NESDIS IS A MEMBER OF 12 PLANET.... . FOR QUESTIONS AND COMMENTS CONCERNING THE SATELLITE PRECIPITATION MESSAGES AND GRAPHICS PLEASE EMAIL SSDPrecip@noaa.gov . FOR PRECIP MESSAGES AND GRAPHICS ON THE WEB: http://www.ospo.noaa.gov/Products/atmosphere/spe/ . FOR AUTOMATED SATELLITE PRECIPITATION ESTIMATES ON THE WEB: http://www.star.nesdis.noaa.gov/smcd/emb/ff/CONUS.php . LAT...LON 2305 16051 2039 15458 1834 15462 2112 16057 2304 16051 . NNNN |
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