Satellite Precipitation Estimates (TXUS20 KWBC)
Issued by NWS

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TXUS20 KNES 141928
SPENES

DAY 1 SATELLITE PRECIPITATION DISCUSSION
NESDIS/SAB
####Z #### ### ## ####
VALID 20-06Z

NOTE...THE LACK OF GOES-EAST SOUNDER DATA CONTINUES TO HAVE A NEGATIVE
IMPACT ON THE SATELLITE ANALYSIS.

...PAC NW...
LATEST WV/IR IMAGERY SHOWING CURRENT SYSTEM THAT HAS BEEN AFFECTING
PAC NW IS SLOWLY DRIFTING ENE INTO SE AK WITH FRONTAL BOUNDARY DRAPED
ALONG THE WA COAST. THERE IS A BREAK IN ENHANCED CLOUDS/RAINFALL (AS PER
MICROWAVE RAIN RATE PRODUCT) BETWEEN THIS SYSTEM AND NEXT ONE TAKING
SHAPE BETWEEN 145-155W. THIS SYSTEM IS TAPPING INTO DEEP SUBTROPICAL
MOISTURE FROM W OF HAWAII WITH A PLUME OF 1.0" TO 1.3" TPW EXTENDING FROM
15N180W TO THE NE TO NEAR 46N135W WITH AMOUNTS BETWEEN 135W AND 155W
200 PERCENT OF NORMAL OR HIGHER. VALUES TAPER OFF A BIT AS THE PLUME
FLATTENS OUT AND IS ALIGNED E/W ALONG THE NORTHERN PERIPHERY OF RIDGE
CENTERED NEAR 38N133W. BEST TPW VALUES ALIGN WELL WITH 89GHZ IMAGERY
WHICH DEPICTS MOISTURE SURGING NE AHEAD OF NEXT SYSTEM. 89GHZ IMAGERY
ALSO SHOWS BOUNDARY FROM CURRENT SYSTEM AFFECTING WA EXTENDS WWRD FROM
WA/OR BORDER ALONG E/W AXIS. WV TRENDS POINT TOWARD SOME MODEST BUILDING
OF MID/UPPER RIDGE WHICH WILL ALLOW FOR SOME NORTHWARD SHIFT IN THE LOW
LEVEL BOUNDARY NEXT 6-12 HOURS. EXPECT HEAVIEST RAINFALL TO BE ALONG
AND NORTH OF THIS BOUNDARY AS THE SHORT WAVE APPROACHES.

CURRENT AMSU RAIN RATES SHOW A SOLID SWATH ASSOCIATED WITH THE PLUME
WITH AN AREA OF ENHANCED RATES NEAR 45N143W APPARENTLY ASSOCIATED WITH
A FLAT IMPULSE EMBEDDED IN THE FLOW OUT AHEAD OF THE MAIN SYSTEM. MAX
RAIN RATES ARE MAINLY AROUND .15"/HR. LOW TO MID LEVEL FLOW AS PER MODEL
GUIDANCE DEPICTS 8H AND 7H WINDS ARE NEARLY UNIDIRECTIONAL AND ALIGNED
WITH THE PLUME WHICH IS ALLOWING FOR RAINFALL EFFICIENCY AND DISCOURAGING
DRY AIR ENTRAINMENT.

RUMINSKI
























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