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ZCZC NFDSPENES ALL SPENES HIZ000- . SATELLITE PRECIPITATION ESTIMATES..DATE/TIME 04/12/19 0457Z SATELLITE ANALYSIS BRANCH/NESDIS---NPPU---TEL.301-683-1404 LATEST DATA USED: GOES-17 0446Z HANNA . LOCATION...HAWAII... . ATTN WFOS...HFO... ATTN RFCS...AKRFC... . EVENT...HEAVY RAIN THREAT . SATELLITE ANALYSIS AND TRENDS...MOST RECENT WV IMAGERY SHOWS THAT THE MID AND UPPER LOW E OF THE HI ISLANDS HAS CONTINUED TO SLOWLY RETROGRADE TO THE W IN RESPONSE TO THE ANOMALOUS RIDGING THAT HAS BUILT TO THE N AND NE OVER PORTIONS OF THE NE PACIFIC. AT LEAST FOR THE IMMEDIATE SHORT TERM, BELIEVE THAT SYSTEM SHOULD REMAIN STATIONARY AS THERE IS LITTLE EVIDENCE OF ANY MOVEMENT IN THE HIGH LEVEL UPSTREAM BLOCKING BOUNDARY W OF THE ISLANDS. LATE DAY VIS IMAGERY IS INDICATING THAT OUTFLOW BOUNDARY FROM EARLIER CONVECTIVE COMPLEX TO THE E OF HI HAS BEGUN TO PUSH INTO E PORTIONS OF THE BIG ISLAND AND SHOULD ALSO MOVE INTO MAUI WITHIN THE NEXT HOUR. HAVE NOTICED SOME INCREASING CONVECTION ALONG THIS BOUNDARY AND BELIEVE THIS SHOULD ALLOW FOR SOME MORE ORGANIZED CONVECTION TO OVERSPREAD BOTH THE BIG ISLAND AND MAUI OVER THE NEXT FEW HOURS. EVENING SOUNDINGS WERE SUGGESTING THAT THE LOSS OF DAYTIME HEATING SHOULD BE AT A MINIMUM PARTIALLY OFFSET BY THE ANOMALOUSLY COLD MID LEVEL TEMPS WITHIN THE UPPER LOW TO CONTINUE THE HEAVY RAIN THREAT THROUGH THE OVERNIGHT HOURS. BLENDED PW ANALYSIS WAS INDICATING THAT MOISTURE HAS BEEN GRADUALLY INCREASING THROUGHOUT THE DAY AS ANOMALOUS E FLOW, MOSTLY AS A RESULT OF ANOMALOUS LOW LEVEL RIDGING THAT EXTENDED ALONG ROUGHLY 35N, WAS TRANSPORTING REMNANT FRONTAL MOISTURE W THROUGHOUT THE DAY. THIS ANOMALOUS E FLOW SHOULD ALSO HELP TO FURTHER ENHANCE RAINFALL TOTALS WITHIN FAVORED TERRAIN. OVERALL BELIEVE HEAVY RAIN THREAT TO CONTINUE THROUGHOUT THE OVERNIGHT HOURS AND INTO THE DAY FRIDAY BEFORE SYSTEM EVENTUALLY BEGINS TO LIFT OUT IN RESPONSE TO THE AMPLIFICATION OF UPSTREAM KICKER NOW ALONG 170W. . ....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 2106 15660 2097 15602 2081 15569 2060 15537 2022 15489 1963 15462 1934 15468 1899 15495 1870 15535 1867 15575 1893 15612 1938 15611 1980 15621 2006 15638 2042 15701 2078 15726 2098 15701 . NNNN |
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