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ZCZC NFDSPENES ALL SPENES HIZ000- . SATELLITE PRECIPITATION ESTIMATES..DATE/TIME 03/01/21 0745Z SATELLITE ANALYSIS BRANCH/NESDIS---NPPU---TEL.301-683-1404 LATEST DATA USED: GOES 17 0710Z; RADAR 0738Z; AMSU PW 0530Z; MESONET;MSL . LOCATION...ISLAND OF HAWAII (BIG ISLAND) AND MAUI... . ATTN WFOS...HFO... ATTN RFCS...AKRFC... . EVENT...FLASH FLOODING HAWAII AND MAUI ISLANDS . SATELLITE ANALYSIS AND TRENDS...THE LATEST G17 ML WV SHOWS MODEST MOISTENING OVER SOUTH MAUI AND NORTHERN PORTIONS OF THE BIG ISLAND ADVECTING FROM THE WEST. THIS IS PART OF A LARGE MOIST AIR MASS IN THE MID-LEVELS THAT MOSTLY REMAINS SOUTH AND WEST OF THE MAIN ISLAND CHAIN. THIS AIR MASS IS SLOWLY DRIFTING TO THE NORTHEAST. THOUGH THE HIGHEST PWATS ARE GENERALLY ASSOCIATED WITH THIS AIR MASS, CURRENT NORTHEASTERN ADVECTION OF THE AIR MASS DOES NOT APPEAR TO BE DRIVING THESE HIGHER PWATS INTO THE AREA, AS LL EASTERLIES ARE DOMINATING MOISTURE ADVECTION. HIGHER PWATS ARE SLOWLY TRENDING SOUTH BUT GENERALLY REMAIN AT AROUND 1 INCH WITH VALUES REACHING 1.5 INCHES AT SOUTHERN PORTIONS OF THE BIG ISLAND. . SHORT TERM OUTLOOK VALID 0800-1200Z...MEDIUM CONFIDENCE FACTOR IN SHORT TERM OUTLOOK...RECENT RADAR TRENDS CONTINUE TO SHOW WIDESPREAD RAINFALL THROUGHOUT THE ISLAND CHAIN, WITH THE MOST PERSISTENT SHOWERS OVER EASTERN PORTIONS OF THE BIG ISLAND AS WELL AS WINDWARD REGIONS OF MAUI, MOLOKAI, AND MUCH OF OAHU. WITH MUCH OF THE GROUND ALREADY SATURATED FROM THE ONGOING RAINFALL FLASH FLOODING IS POSSIBLE WITH THE HIGHEST LIKELIHOOD IN WINDWARD REGIONS OF THE BIG ISLAND AND MAUI THAT HAVE RECEIVED THE MOST RAINFALL OVER THE PAST 24-HRS AS WELL AS LOW-LYING AREAS WHERE RUNOFF AND RIVER FLOODING IS LIKELY. LOCALIZED FLOODING CAN NOT BE RULED OUT ON OTHER ISLANDS SUCH AS OAHU IF SIGNIFICANT TRAINING OR CONVECTION SETS ITSELF UP OVER THOSE REGIONS. . ....NESDIS IS A MEMBER OF NWSCHAT (NESDISSATELLITEPRECIP).... ....NESDIS IS A MEMBER OF 12 PLANET.... . FOR QUESTIONS AND COMMENTS CONCERNING THE SATELLITE PRECIPITATION MESSAGES WHICH DISCONTINUE 12 APRIL 2021 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 2229 15823 2226 15823 1878 15284 1875 15551 2229 16099 . NNNN |
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