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ZCZC NFDSPENES ALL SPENES HIZ000- . SATELLITE PRECIPITATION ESTIMATES..DATE/TIME 02/17/21 0106Z SATELLITE ANALYSIS BRANCH/NESDIS---NPPU---TEL.301-683-1404 LATEST DATA USED: GOES-17 0050Z; AMSU/SSMIS 2330Z; RADAR 0102Z;MSL . LOCATION...HAWAII... . ATTN WFOS...HFO... ATTN RFCS...AKRFC... . EVENT...FLASH FLOODING HAWAIIAN ISLANDS . SATELLITE ANALYSIS AND TRENDS...RECENT G17 IMAGERY SHOWS A COLD FRONT APPROACHING FROM THE NORTHWEST AHEAD OF UL TROFFING. THESE COMBINED FEATURES ARE FUNNELING VERY MOIST AIR NORTHEASTWARD ALONG THE EASTWARD MOVING FRONTAL AXIS. 2330Z AMSU PWATS REMAIN ABOVE 1.5" OVER THE WESTERN ISLANDS, WITH PWATS SHARPLY DROPPING OFF BEHIND THE FRONT. G17 UL WV IMAGERY INDICATES GRADUAL MOISTENING OF THE AIR MASS OVER ALL OF THE STATE, WITH THE FASTEST MOISTENING OCCURRING OVER THE WESTERN QUARTER, AS INDICATED BY VISIBLE IMAGERY SHOWING INCREASED CIRRUS. VISIBLE IMAGERY CLEARLY SHOWS A LINE OF FRONTAL LIFTING RACING SOUTHEAST ALONG THE BOUNDARY. CONVECTION IS BEGINNING TO ORGANIZE JUST AHEAD OF SAID LIFTING, WITH SHOWERS STARTING TO POP UP DUE WEST OF KAUAI. . SHORT TERM OUTLOOK VALID 0100-1200Z...MEDIUM CONFIDENCE FACTOR IN SHORT TERM OUTLOOK...RADAR OVER KAUAI INDICATES STEADY RAIN FALLING OVER NORTHEASTERN NI’IHAU, WITH SCATTERED SHOWERS INCREASING IN COVERAGE TO THE SOUTH AND WEST. SHOWERS WILL CONTINUE TO INCREASE IN COVERAGE AS THE FRONT APPROACHES AND REACHES KAUAI COUNTY OVER THE NEXT SEVERAL HOURS. THIS FRONT, ALONG WITH THE UPPER-LEVEL TROFFING, WILL BE THE MAIN LIFTING MECHANISMS. A FLASH FLOOD WATCH HAS BEEN ISSUED FOR KAUAI COUNTY, WITH THE HIGHEST POTENTIAL FOR FLASH FLOODING IN URBAN AND LOW-LYING AREAS, AS WELL AS SATURATED GROUNDS FROM EARLIER RAIN. . ....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 2273 15429 1826 15411 1816 16127 2270 16124 . NNNN |
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