FVXX25 KNES 110059
VA ADVISORY
DTG: 20210411/0059Z

VAAC: WASHINGTON

VOLCANO: SOUFRIERE ST VINCENT 360150
PSN: N1319 W06110

AREA: W_INDIES

SUMMIT ELEV: 3865 FT (1178 M)

ADVISORY NR: 2021/012

INFO SOURCE: GOES-16. NWP MODELS. ASH3D. VOLCAT.
SOCIAL MEDIA. 

ERUPTION DETAILS: ONGOING EXPLOSIVE EMS.

OBS VA DTG: 11/0030Z

OBS VA CLD: SFC/FL400 N2108 W03859 - N2047 W03224
- N1743 W03149 - N1435 W03343 - N1439 W03848 -
N1153 W04531 - N1437 W04839 - N1222 W05400 -
N1553 W05538 - N1700 W05240 - N2108 W03859 MOV E
30KT SFC/FL470 N1555 W05532 - N1224 W05400 -
N1433 W04835 - N1149 W04529 - N1017 W04657 -
N0657 W05040 - N0622 W05358 - N1110 W05743 -
N1535 W05838 - N1555 W05532 MOV E 0KT SFC/FL520
N1546 W05855 - N1052 W05743 - N1303 W06113 -
N1328 W06118 - N1546 W05855 MOV E 40KT 

FCST VA CLD +6HR: 11/0630Z SFC/FL400 N2152 W03317
- N1717 W03143 - N1458 W03428 - N1234 W04409 -
N1340 W04641 - N1307 W05331 - N1611 W05419 -
N1948 W04420 - N2152 W03317 SFC/FL470 N1609
W05422 - N1309 W05328 - N1344 W04643 - N1234
W04409 - N1342 W03911 - N1246 W04045 - N0556
W05241 - N1014 W05727 - N1538 W05844 - N1609
W05422 SFC/FL520 N1553 W05852 - N1034 W05733 -
N1303 W06118 - N1331 W06116 - N1553 W05852 

FCST VA CLD +12HR: 11/1230Z SFC/FL400 N2045
W04051 - N2011 W03205 - N1317 W03343 - N1234
W04355 - N1240 W05232 - N1637 W05404 - N2045
W04051 SFC/FL470 N1632 W05404 - N1235 W05234 -
N1247 W03913 - N0602 W05346 - N1040 W05735 -
N1553 W05853 - N1632 W05404 SFC/FL520 N1549
W05855 - N1038 W05739 - N1259 W06116 - N1344
W06122 - N1549 W05855 

FCST VA CLD +18HR: 11/1830Z SFC/FL400 N1901
W03929 - N1753 W03122 - N1208 W03338 - N1218
W05251 - N1534 W05338 - N1901 W03929 SFC/FL470
N1534 W05338 - N1220 W05251 - N1210 W03343 -
N0618 W05350 - N1116 W05820 - N1506 W05828 -
N1534 W05338 SFC/FL520 N1510 W05828 - N1117
W05818 - N1315 W06128 - N1342 W06122 - N1510
W05828 

RMK: PERIODIC EXPLOSIONS LOFTING VA TO FL520 NEAR
SUMMIT REGION. DOWNWIND VA EXTENDS TO ABOUT 1700
NM ESPECIALLY TO ENE BUT BECOMES RATHER DIFFUSE.
6-18 HR GRAPHIC ASSUMES CONT ACT. 00Z RADIOSONDE
UNAVAILABLE. FCST BASED ON VARIOUS GUIDANCE.
...LEE

NXT ADVISORY: WILL BE ISSUED BY 20210411/0700Z