930  
FXSA20 KWBC 081427  
PMDSA  
 
SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
927 AM EST WED NOV 08 2017  
 
GFS DATA AT FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PROD/  
 
SYNOPSIS (VALID FROM NOV 08 AT 0000 UTC): NORTH OVER THE  
CONTINENT...AT 200 HPA...A RIDGE EXTENDS WEST-TO-EAST BETWEEN  
05S-20S. NORTH OF THIS AXIS...A SHORT WAVE TROUGH EXTEND ACROSS  
AMAPA IN BRASIL TO THE GUIANAS. THE TROUGH IS INTERACTING WITH THE  
ITCZ TO THE NORTH...ENHANCING CONVECTION OVER NORTHERN FRENCH  
GUIANA. THE RIDGE...MEANWHILE...VENTS ORGANIZED DEEP CONVECTION  
ACROSS TOCANTINS-GOIAS-BAHIA IN BRASIL. OTHER CONVECTION WAS  
BUILDING TO THE WEST ACROSS PARA-AMAZONAS-ACRE IN BRASIL TO THE  
PERUVIAN JUNGLE.  
 
THE 250 HPA ANALYSIS SHOWS THE SOUTHERN POLAR WITH AXIS ALONG 48S  
120W...41S 110W...41S 98W...EXITING AT 44S 89W. A FINGER TO THE  
EAST EXTENDS BETWEEN 60S 46W AND 51S 42W. THE NORTHERN POLAR LIES  
ALONG 43S 120W...38S 112W...37S 103W...38S 95W...EXITING AT 40S  
89W. IT REFORMS AT 42S 53W...ALONG 39S 46W...35S 41W...30S  
30W...34S 21W...40S 13W...AND 46S 08W. THE SUBTROPICAL JET EXTENDS  
ALONG 29S 120W...30S 110W...33S 99W...A 133KT MAXIMUM AT 34S  
87W...31S 72W...EXITING AT 28S 63W. IT REFORMS AT 27S 53W...ALONG  
26S 44W...25S 33W...25S 25W...EXITING AT 23S 17W.  
 
AT 500 HPA...A TROUGH EXTENDS NORTH BETWEEN 80W-110W TO 30S. THIS  
IS PRECEDED BY A SHORT WAVE TROUGH THAT EXTENDS ACROSS SOUTHERN  
CHILE TO PATAGONIA IN ARGENTINA. ANOTHER IS PULLING ACROSS  
MESOPOTAMIA VALLEY IN ARGENTINA TO URUGUAY/SOUTHERN BRASIL. THE  
LATTER PROVIDES THE DYNAMICAL SUPPORT TO ORGANIZED DEEP CONVECTION  
ACROSS MATO GROSSO DO SUL-PARAGUAY. A SKEWED RIDGE TO THE EAST  
EXTENDS ALONG THE SOUTH COAST OF BRASIL...50S 57W TO THE ANTARCTIC  
PENINSULA. DOWNSTREAM FROM THIS RIDGE...A TROUGH EXTENDS BETWEEN  
45W-00W TO 24S.  
 
AT LOW LEVELS...AN OCCLUDED 966 HPA LOW AT 63S 96W EXTENDS A FRONT  
ALONG A 966 HPA LOW AT 67S 91W...65S 77W...59S 78W...A 994 HPA LOW  
AT 57S 81W...53S 80W...50S 81W...A 1006 HPA LOW AT 41S 91W...36S  
99W...TO 32S 107W. ANOTHER FRONT TO THE EAST LIES ALONG A 996 HPA  
LOW AT 64S 54W...58S 52W...54S 58W...52S 67W...A 1010 HPA LOW AT  
47S 69W...PATAGONIA TO CENTRAL CUYO. THIS SUSTAINS SCATTERED  
CONVECTION ACROSS THE SOUTHERN CONE. BROAD RIDGE TO THE EAST  
CENTERS ON A 1025 HPA HIGH AT 41S 48W...AND A 1023 HPA HIGH AT 33S  
41W. A 1016 HPA LOW AT 34S 50W EXTENDS A FRONT ACROSS BUENOS AIRES  
TO A 1010 HPA LOW AT 34S 62W...TO MENDOZA. THIS SUSTAINS SCATTERED  
STRATIFORM RAINFALL OVER BUENOS AIRES PROVINCE. AN ELONGATED FRONT  
TO THE EAST AND NORTH LIES ALONG A 1010 HPA LOW AT 38S 14W...33S  
15W...30S 19W...A 1014 HPA LOW AT 27S 23W...25S 25W...20S  
31W...ESPIRITO SANTO...SAO PAULO...MISIONES...A 1006 HPA LOW AT  
27S 58W...TO SALTA IN NORTHWEST ARGENTINA. THIS SUSTAINS SCATTERED  
DEEP CONVECTION ACROSS MID SECTIONS OF SOUTH AMERICA.  
 
OVIEDO...SHN (ARGENTINA)  
VANNUCCI...SMN (ARGENTINA)  
RIVAS...SENAMHI (PERU)  
DAVISON...WPC (USA)  

 
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab HPC Page Main Text Page