Alert archive / Mississippi / Special Weather Statements in 2021

Special Weather Statement, NWS New Orleans, LA

June 21, 2021Hancock County, Harrison County, Mississippi

NWS New Orleans, LA issued this special weather statement at Jun 21, 2021, 5:55 PM CDT for Hancock County, Harrison County, Mississippi. It was in force for 50 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: Jun 21, 2021, 5:55 PM CDT (22:55 UTC)
Expired: Jun 21, 2021, 6:45 PM CDT
In force: 50 min
Issued by: NWS New Orleans, LA

Counties Hancock County, MS, Harrison County, MS

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 10.9 hours before the alert went out and 42 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 730 J/kg
Mixed-layer CIN: -82 J/kg
Mixed-layer LCL: 990 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 105 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 New Orleans, LA wrote its last area forecast discussion before this special weather statement went out at Jun 21, 3:53 PM CDT, 2 hours 2 minutes earlier.

Area forecast discussion, Jun 21, 3:53 PM CDT, 2 hours 2 minutes before

Area Forecast Discussion
National Weather Service New Orleans LA
353 PM CDT Mon Jun 21 2021

.SHORT TERM...
Tonight through Thursday...
Tonight into Tuesday morning, a frontal system is expected to move
through our area, increasing rain chances. Southerly surface winds
will help to enhance the lifting and moisture advection into the
area. Upper level divergence will help to enhance buoyancy and
help with efficiency. PW values will remain above the 75th
percentile for the SPC sounding climatology for the next few days.
These storms will have the potential for locally heavy rainfall
overnight, especially in the vulnerable areas. Lightning will also
be a concern overnight as well.

Tuesday through Thursday, the frontal boundary will linger over
the area. Wednesday and Thursday, the boundary refires
convection, mainly during the afternoon hours. Southerly surface
winds will help to enhance lifting and moisture advection over the
area Tuesday through Thursday. PW values will remain over the
75th percentile for the next few days. Heavy rainfall inside of
thunderstorm development will be a concern with this frontal
system moving through, particularly Tuesday. Lightning will also
be a concern as well. MSW

.LONG TERM...
Friday through Monday...
Friday through Monday, more of a normal summertime pattern will
begin to dominate the area. Rain chances will be enhanced, mainly
during the afternoon hours. Southerly surface winds will help to
enhance moisture advection in the atmosphere. PW values will
remain high through this time period. Scattered thunderstorms and
showers will be possible daily during the peak daytime heating
hours. Lightning will be a concern inside thunderstorm development
as well. MSW

&&

.AVIATION...
VFR conditions prevail at all area airports. Some vicinity showers
will be possible through the afternoon hours. Temporary periods of
showers and storms will be possible at all area airports which
will cause lower visibilities and ceilings, and TEMPO groups are
in place during the best timing for these showers and storms.
Overnight tonight through the end of the forecast period, MVFR
conditions will be possible due to low ceilings and vicinity
showers. MCB may get to IFR conditions around daybreak tomorrow
briefing due to fog and vicinity showers before returning to MVFR
conditions for the end of the forecast period. MSW

&&

.MARINE...
Tonight through Friday, winds will be southerly and moderate (<15
knots). Friday afternoon through Monday, winds will be easterly to
southeasterly and moderate (<15 knots). Wave heights will
correspond to the wind speeds. MSW

&&

.PRELIMINARY POINT TEMPS/POPS...
MCB  71  83  70  89 /  80  80  20  50
BTR  73  86  73  90 /  80  90  30  60
ASD  73  86  72  89 /  80  80  40  70
MSY  76  87  76  89 /  80  80  40  70
GPT  74  85  74  87 /  90  80  40  70
PQL  72  84  72  87 /  90  90  50  70

&&

.LIX WATCHES/WARNINGS/ADVISORIES...
LA...None.
GM...None.
MS...None.
GM...None.
&&

In the hours before

Local storm report, Jun 21, 5:15 PM CDT, 40 minutes before

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Local storm report, Jun 21, 5:36 PM CDT, 19 minutes before

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Local storm report, Jun 21, 5:46 PM CDT, 9 minutes before

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Local storm report, Jun 21, 5:49 PM CDT, 6 minutes before

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Special weather statement, Jun 21, 5:50 PM CDT, 5 minutes before

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Special weather statement, Jun 21, 5:55 PM CDT, 0 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
Jun 21, 8:59 AM CDT	Special Weather Statement	LIX	East Baton Rouge, Livingston	46 min
Jun 21, 10:15 AM CDT	Special Weather Statement	LIX	Livingston	30 min
Jun 21, 10:26 AM CDT	Special Marine Warning	LIX		94 min
Jun 21, 10:31 AM CDT	Special Marine Warning	LIX		119 min
Jun 21, 10:52 AM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany, Tangipahoa	33 min
Jun 21, 10:59 AM CDT	Special Marine Warning	LIX		61 min
Jun 21, 12:25 PM CDT	Special Marine Warning	LIX		2 hr
Jun 21, 12:33 PM CDT	Special Weather Statement	LIX	Saint James	57 min
Jun 21, 1:11 PM CDT	Severe Thunderstorm Warning	LIX	Terrebonne	64 min
Jun 21, 2:21 PM CDT	Special Marine Warning	LIX		39 min
Jun 21, 2:39 PM CDT	Areal Flood Advisory	LIX	Jefferson, Orleans, Saint Bernard, Saint Charles	3 hr
Jun 21, 2:51 PM CDT	Special Marine Warning	LIX		84 min
Jun 21, 3:03 PM CDT	Severe Thunderstorm Warning	LIX	Terrebonne	42 min
Jun 21, 3:28 PM CDT	Areal Flood Advisory	LIX	Saint Tammany	29 min
Jun 21, 3:28 PM CDT	Special Weather Statement	LIX	Saint Tammany	32 min
Jun 21, 3:39 PM CDT	Flash Flood Warning	LIX	Jefferson, Orleans, Saint Charles	3 hr
Jun 21, 3:39 PM CDT	Special Weather Statement	LIX	Lafourche	36 min
Jun 21, 3:43 PM CDT	Special Marine Warning	LIX		92 min
Jun 21, 3:53 PM CDT	Areal Flood Advisory	LIX	Lafourche, Saint Charles, Terrebonne	3 hr
Jun 21, 3:57 PM CDT	Flash Flood Warning	LIX	Saint Tammany	2 hr
Jun 21, 4:16 PM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Orleans, Saint Charles, Saint John the Baptist	44 min
Jun 21, 4:24 PM CDT	Special Marine Warning	LIX		96 min
Jun 21, 4:29 PM CDT	Special Weather Statement	LIX	Iberville, Pointe Coupee, West Feliciana	31 min
Jun 21, 5:04 PM CDT	Special Weather Statement	LIX	East Feliciana	56 min
Jun 21, 5:10 PM CDT	Special Marine Warning	LIX		54 min
Jun 21, 5:18 PM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany	42 min
Jun 21, 5:59 PM CDT	Special Marine Warning	LIX		31 min
Jun 21, 6:38 PM CDT	Special Marine Warning	LIX		52 min
Jun 21, 2:11 PM CDT	Areal Flood Advisory	LIX	Harrison	91 min
Jun 21, 2:55 PM CDT	Flash Flood Warning	LIX	Harrison, Jackson	67 min
Jun 21, 4:36 PM CDT	Special Weather Statement	LIX	Hancock, Pearl River	24 min
Jun 21, 4:57 PM CDT	Areal Flood Advisory	LIX	Hancock, Harrison, Pearl River	3 hr
Jun 21, 5:49 PM CDT	Areal Flood Advisory	LIX	Hancock, Harrison	3 hr
Jun 21, 5:50 PM CDT	Special Weather Statement	LIX	Amite	25 min
Jun 21, 5:55 PM CDT	Flash Flood Warning	LIX	Hancock, Harrison	3 hr
Jun 21, 6:24 PM CDT	Special Weather Statement	LIX	Amite, Pike	66 min
Jun 21, 6:32 PM CDT	Special Weather Statement	LIX	Jackson	58 min
Jun 21, 6:51 PM CDT	Flash Flood Warning	LIX	Harrison, Jackson	3 hr

Nearby

Special Weather Statements in Mississippi, 2021 Every special weather statement in 2021

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.