Alert archive / South Carolina / Special Weather Statements in 2017

Special Weather Statement, NWS Wilmington, NC

March 1, 2017Marlboro County, South Carolina

NWS Wilmington, NC issued this special weather statement at Mar 1, 2017, 9:30 PM EST for Marlboro County, South Carolina. It was in force for 45 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Mar 1, 2017, 9:30 PM EST (02:30 UTC)
Expired
Mar 1, 2017, 10:15 PM EST
In force
45 min
Issued by
NWS Wilmington, NC

County Marlboro County, SC

The radar

The Wilmington radar (KLTX), 141 km from the middle of the area, began a volume at 02:34 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 2.5 hours before the alert went out and 164 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Greensboro/Hi Pt, NC at 00:00Z on 2017-03-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Greensboro/Hi Pt, NC at 00:00Z on 2017-03-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 37 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
838 m above ground
0-6 km bulk shear
72 kt
0-1 km storm-relative helicity
37 m²/s²
0-3 km storm-relative helicity
335 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

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

NWS Wilmington, NC wrote its last area forecast discussion before this special weather statement went out at Mar 1, 7:32 PM EST, 1 hour 58 minutes earlier.

Area forecast discussion, Mar 1, 7:32 PM EST, 1 hour 58 minutes before
Area Forecast Discussion
National Weather Service Wilmington NC
732 PM EST Wed Mar 1 2017

.SYNOPSIS...
A cold front will bring showers and thunderstorms late tonight.
Thursday will turn seasonably cool followed by a period of cold
weather Friday and Saturday. Sunday will mark the return of mild
weather.

&&

.NEAR TERM /THROUGH THURSDAY/...
As of 700 PM Wednesday...Latest SPC convective Day 1 outlook
has shifted the slight risk area to include all but the far
southern CWA. The ongoing strong to severe convection moving
across upstate SC will reach the western CWA by about 04Z.
Despite limited instability, strong wind shear will result in
at least some potential for storms to possess supercell
characteristics as they approach the coast. The northern CWA
would be a favored area due proximity of the strongest low-
level jetting.

The cold front will drop from NW to SE across the CWA starting
around midnight and will be offshore by daybreak. Rapid
cooling and drying will follow FROPA Thursday morning. Expect
sunny skies Thursday afternoon with highs in the mid 60s.

&&

.SHORT TERM /THURSDAY NIGHT THROUGH FRIDAY NIGHT/...
As of 300 PM Wednesday...Cool and dry advection Thursday night into
Friday will keep the sky clear and bring seasonable temperatures. A
shortwave passes through around midday Friday and it will be
followed by a bolstering of the strength of the cold advection. This
could lead to a slight non-diurnal temperature curve as gusty NW
winds flatten or even weakly reverse afternoon temperature rises.
As this CAA continues into Friday night 850mb temperatures will drop
to roughly -3C to -6C, south to north. This will lead to near
freezing to possibly subfreezing (mainly inland) temperatures
across the area. This will be a bit more problematic this year as the
warm winter has put local flora and some agriculture ahead of their
normal curves.

&&

.LONG TERM /SATURDAY THROUGH WEDNESDAY/...
As of 700 PM Wednesday...Surface high moves off the coast
Sunday while mid level heights builds. On Tuesday the warmth
will continue but a flattening of the upper ridge may allow for
deeper moisture, possibly to the point where some minor rain
chances are justified. Currently the POPs are capped around 20.
Warm and moist advection continues on Wednesday in the low
levels. Overall deep forcing for precipitation remains lacking
however and so the trend of warm temperatures and very low rain
chances will continue. A backdoor cold front Wednesday night
into Thursday will temper the warmth while slightly raising rain
chances.

&&

.AVIATION /00Z THURSDAY THROUGH MONDAY/...
As of 00z...Cold front expected to cross the area from west to
east roughly 07-10Z. Associated line of strong to severe
convection crossing upstate SC this evening will begin to impact
KFLO and KLBT by midnight, and some potential for the storms to
maintain severe characteristics will likely continue as they
approach the coast. Low-level jetting will result in wind gusts
greater than 20 knots, outside of convection, through about
09Z. A shift to NW winds will occur behind the cold front, which
should push off the coast by 10Z, followed by clearing mid to
late Thursday morning.

Extended Outlook...Predominantly VFR expected.

&&

.MARINE...
NEAR TERM /TONIGHT THROUGH THURSDAY/...
As of 700 PM Wednesday...Small Craft Advisory remains in effect
through Thursday afternoon as strong SW winds continue in
advance of the next cold front. Thunderstorms ahead of the cold
front should begin to move off the coast by around 2 AM. The
front will move across the waters around daybreak Thursday
morning, with winds backing to the NW early and diminishing
during the afternoon.

SHORT TERM /THURSDAY NIGHT THROUGH FRIDAY NIGHT/...
As of 300 PM Wednesday...The area will be in a cold advection
northerly flow regime through the period except for a brief
backing to westerly on Friday around midday. This coincides with
a strengthening of the cold air advection, the resulting Friday
night increase in wind speeds possibly necessitating Small
Craft Advisory.

LONG TERM /SATURDAY AND SUNDAY/...
As of 300 PM Wednesday...The period may start off with SE winds
around high pressure off the MidAtlantic coast but as it moves
eastward most of the long term will be characterized by SW flow.
Though the high will be moderately strong (about 1033mb) its
large and sprawling nature will tend to keep waves in the
'normal' 10 to 15 kt range. Any swell energy in the western
Atlantic will remain well to our south so the remaining wind
waves will likely average about 2 ft.

&&

.ILM WATCHES/WARNINGS/ADVISORIES...
SC...None.
NC...None.
MARINE...Small Craft Advisory until 3 PM EST Thursday for AMZ250-252-
     254-256.

&&

SYNOPSIS...MBB
NEAR TERM...REK/CRM
SHORT TERM...MBB
LONG TERM...MBB
AVIATION...CRM
Hazardous weather outlook, Mar 1, 2:28 PM EST, 7 hours 2 minutes before
Hazardous Weather Outlook
National Weather Service Wilmington NC
228 PM EST Wed Mar 1 2017

NCZ087-096-099-105>109-SCZ017-023-024-032-033-039-053-055-021930-
Robeson-Bladen-Columbus-Inland Pender-Coastal Pender-
Inland New Hanover-Coastal New Hanover-Inland Brunswick-Marlboro-
Darlington-Dillon-Florence-Marion-Williamsburg-Inland Horry-
Inland Georgetown-
228 PM EST Wed Mar 1 2017

This Hazardous Weather Outlook is for southeast North Carolina and
northeast South Carolina.

.DAY ONE...This Afternoon and Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Relative humidity values will drop to near 25 percent Friday and
Saturday afternoons.

Freezing temperatures are possible Saturday and Sunday mornings.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

AMZ250-252-254-256-021930-
Coastal waters from Surf City to Cape Fear NC out 20 nm-
Coastal waters from Cape Fear NC to Little River Inlet SC out 20 nm-
Coastal waters from Little River Inlet to Murrells Inlet SC out
20 nm-
Coastal waters from Murrells Inlet to South Santee River SC out
20 nm-
228 PM EST Wed Mar 1 2017

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 3 PM EST THURSDAY...

This Hazardous Weather Outlook is for The adjacent Coastal Waters.

.DAY ONE...This Afternoon and Tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Small Craft Advisory.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Small Craft Advisory.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

NCZ110-SCZ054-056-021930-
Coastal Brunswick-Coastal Horry-Coastal Georgetown-
228 PM EST Wed Mar 1 2017

This Hazardous Weather Outlook is for southeast North Carolina and
northeast South Carolina.

.DAY ONE...This Afternoon and Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Relative humidity values will drop to near 25 percent Friday and
Saturday afternoons.

Freezing temperatures are possible Saturday and Sunday mornings.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

In the hours before

Special weather statement, Mar 1, 9:30 PM EST, 0 minutes before
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The office that day

Everything else NWS Wilmington, NC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 1, 10:16 PM ESTSpecial Weather StatementILMDarlington, Dillon, Florence59 min
Mar 1, 10:59 PM ESTSpecial Weather StatementILMDillon, Florence, Marion61 min
Mar 1, 10:55 PM ESTSevere Thunderstorm WarningILMBladen, Robeson50 min
Mar 1, 11:38 PM ESTSpecial Weather StatementILMPender52 min

Nearby

Special Weather Statements in South Carolina, 2017Every special weather statement in 2017

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.