Alert archive / Louisiana / Small Craft Advisories in 2020

Small Craft Advisory 28, NWS New Orleans, LA

April 12, 2020

NWS New Orleans, LA issued this small craft advisory at Apr 12, 2020, 9:54 PM CDT. It took effect at Apr 12, 2020, 10:00 PM CDT. It was in force for 18 hr.

The area

The counties it named.

The facts

Issued: Apr 12, 2020, 9:54 PM CDT (02:54 UTC)
In effect from: Apr 12, 2020, 10:00 PM CDT
Expired: Apr 13, 2020, 4:00 PM CDT
In force: 18 hr
Issued by: NWS New Orleans, LA

What forecasters said that day

The local office's own words before this small craft advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS New Orleans, LA wrote its last area forecast discussion before this small craft advisory went out at Apr 12, 4:04 PM CDT, 5 hours 50 minutes earlier.

Area forecast discussion, Apr 12, 4:04 PM CDT, 5 hours 50 minutes before

Area Forecast Discussion
National Weather Service New Orleans LA
404 PM CDT Sun Apr 12 2020

.SYNOPSIS...

Surface low over northwest Arkansas at 3 PM CDT, with a cold front
to near Houston. Upper trough over southern Oklahoma, per water
vapor loops. LIX 18z sounding continued to show a cap at 850 mb,
which is inhibiting storms from moving much further eastward than
a McComb to Baton Rouge line at this time. We will be launching a
special sounding shortly to reassess lower levels of the
atmosphere over the eastern half of the area. Tornado Watch 107
continues until 8 PM for northern half of the CWA.

&&

.SHORT TERM...

Short range models show highest threat of severe weather likely to
be north of our CWA, but still enough potential here to not change
the message at this time. All precipitation should be clear of our
area by 07-08z. Will continue Wind Advisory and Coastal Flood
Advisory as currently configured. Water levels 1 to 1.5 feet above
normal. Once wind direction shifts, water levels should start
diminishing. Dry Monday through Tuesday afternoon. As front
becomes parallel to upper flow, could have a period of showers
and/or storms move over the coastal waters and possibly coastal
areas Tuesday night.

Will go with blended temperatures for the short range as not a
major discrepancy for most of the area.

&&

.LONG TERM...

Timing differences exist for the next system next weekend, will
continue using blended solutions until a preferred solution
becomes apparent.

&&

.AVIATION...

Outside of convection, MVFR to VFR ceilings common. Convection
will lower to IFR conditions. Southerly wind gusts 30+ knots
likely producing significant crosswind issues on E-W runway
configurations. LLWS also likely until cold frontal passage. Should
see improvement to VFR behind front.

&&

.MARINE...

No change to current headlines, Small Craft Advisories verifying
well, with a few of the elevated oil platforms seeing an
occasional gust to gale force. Winds should relax behind frontal
passage as pressure gradient eases and cold advection remains to
the north. Winds will increase to the 15-20 knot range again
around Tuesday night as wave moves along the front over the Gulf
of Mexico with these trends continuing into Thursday.

&&

.PRELIMINARY POINT TEMPS/POPS...
MCB  60  75  52  77 /  30   0   0  10
BTR  58  74  52  78 /  20   0   0  20
ASD  62  81  55  81 /  60   0   0  20
MSY  64  80  61  80 /  50   0   0  20
GPT  65  81  57  78 /  50   0   0  20
PQL  63  84  55  82 /  70   0   0  30

&&

.LIX WATCHES/WARNINGS/ADVISORIES...
LA...Wind Advisory until 10 PM CDT this evening for LAZ034>037-039-
     040-046>050-056>072.

     Coastal Flood Advisory until 7 PM CDT this evening for LAZ040-
     050-058-060>062-064-066>070-072.

GM...Small Craft Advisory until 10 PM CDT this evening for GMZ530-534-
     550-552-570-572.

     Small Craft Advisory until 4 AM CDT Monday for GMZ532-536-538-
     555-557-575-577.

MS...Wind Advisory until 10 PM CDT this evening for MSZ068>071-077-
     080>082.

     Coastal Flood Advisory until 7 PM CDT this evening for
     MSZ080>082.

GM...Small Craft Advisory until 10 PM CDT this evening for GMZ534-550-
     552-570-572.

     Small Craft Advisory until 4 AM CDT Monday for GMZ536-538-555-
     557-575-577.

&&

In the hours before

Local storm report, Apr 12, 5:17 PM CDT, 4 hours 37 minutes before

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Local storm report, Apr 12, 6:05 PM CDT, 3 hours 49 minutes before

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Special weather statement, Apr 12, 6:07 PM CDT, 3 hours 47 minutes before

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Special weather statement, Apr 12, 6:35 PM CDT, 3 hours 19 minutes before

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Special weather statement, Apr 12, 6:39 PM CDT, 3 hours 15 minutes before

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Special weather statement, Apr 12, 6:46 PM CDT, 3 hours 8 minutes before

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The office that day

Everything else NWS New Orleans, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 12, 7:02 PM CDT	Severe Thunderstorm Warning	LIX	Livingston, Tangipahoa	43 min
Apr 12, 8:29 PM CDT	Special Weather Statement	LIX	Saint Tammany	31 min
Apr 12, 9:08 PM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany	31 min
Apr 13, 5:46 AM CDT	Dense Fog Advisory	LIX	Assumption, Saint James	3 hr
Apr 12, 8:40 PM CDT	Severe Thunderstorm Warning	LIX	Amite, Wilkinson	33 min
Apr 12, 8:56 PM CDT	Special Weather Statement	LIX	Hancock, Pearl River	64 min
Apr 12, 9:56 PM CDT	Special Weather Statement	LIX	Pike, Walthall	49 min

Nearby

Small Craft Advisories in Louisiana, 2020 Every small craft advisory in 2020

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text.