Alert archive / Mississippi / Special Weather Statements in 2021

Special Weather Statement, NWS New Orleans, LA

July 12, 2021Jackson County, Mississippi

NWS New Orleans, LA issued this special weather statement at Jul 12, 2021, 1:27 PM CDT for Jackson County, Mississippi. It was in force for 63 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: Jul 12, 2021, 1:27 PM CDT (18:27 UTC)
Expired: Jul 12, 2021, 2:30 PM CDT
In force: 63 min
Issued by: NWS New Orleans, LA

County Jackson County, MS

The radar

The Mobile radar (KMOB), 54 km from the middle of the area, began a volume at 18:29 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

Slidell Radar S, LA (KSIL), launched 12:00Z, 6.5 hours before the alert went out and 95 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: 3080 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 582 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 122 m²/s²
0-3 km storm-relative helicity: 93 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 Jul 12, 12:37 PM CDT, 50 minutes earlier.

Area forecast discussion, Jul 12, 12:37 PM CDT, 50 minutes before

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In the hours before

Local storm report, Jul 12, 11:45 AM CDT, 1 hour 42 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1145 AM CDT MON JUL 12 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1143 AM     TSTM WND GST     13 SSW MANDEVILLE       30.19N 90.12W
07/12/2021  M46 MPH          GMZ530             LA   MESONET

            SENSOR RECORDED 46 MPH WIND GUST.

&&

KO

Special weather statement, Jul 12, 11:49 AM CDT, 1 hour 38 minutes before

Special Weather Statement
National Weather Service New Orleans LA
1149 AM CDT Mon Jul 12 2021

LAZ061-077-121715-
Western Orleans-Upper Jefferson-
1149 AM CDT Mon Jul 12 2021

...A STRONG THUNDERSTORM WILL AFFECT WEST CENTRAL ORLEANS AND
NORTHWESTERN JEFFERSON PARISHES...

At 1149 AM CDT, a strong thunderstorm was located over Metairie,
moving east at 25 mph.

Winds in excess of 40 mph are possible with this storm.

Locations impacted include...
New Orleans, Metairie, Avondale, Harvey, Jefferson, Gretna, Harahan,
Westwego, Elmwood, Bridge City, River Ridge, Waggaman, New Orleans
Armstrong Airport and Lakefront Airport.

This includes the following Interstates...
 Interstate 10 in Louisiana between mile markers 222 and 243.
 Interstate 610 between mile markers 1 and 4.

If outdoors, consider seeking shelter inside a building.

LAT...LON 2997 9028 3005 9028 3002 9018 3002 9011
      3004 9006 3003 9003 3006 9003 3004 9002
      3005 8998 2991 9006 2991 9027
TIME...MOT...LOC 1649Z 273DEG 20KT 3000 9021

TB

Local storm report, Jul 12, 12:10 PM CDT, 1 hour 17 minutes before

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Special weather statement, Jul 12, 12:23 PM CDT, 1 hour 4 minutes before

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Local storm report, Jul 12, 12:24 PM CDT, 1 hour 3 minutes before

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Special weather statement, Jul 12, 1:27 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
Jul 12, 3:50 AM CDT	River Flood Warning	LIX	Saint Tammany	31 hr
Jul 12, 3:50 AM CDT	River Flood Warning	LIX	Saint Tammany	10 hr
Jul 12, 5:45 AM CDT	River Flood Warning	LIX	Saint Tammany	30 hr
Jul 12, 7:23 AM CDT	Special Weather Statement	LIX	West Feliciana	52 min
Jul 12, 8:04 AM CDT	Special Weather Statement	LIX	East Feliciana, Pointe Coupee, West Feliciana	56 min
Jul 12, 9:00 AM CDT	Special Weather Statement	LIX	East Baton Rouge, East Feliciana, Pointe Coupee, Saint Helena, West Baton Rouge, West Feliciana	30 min
Jul 12, 10:56 AM CDT	Special Marine Warning	LIX		64 min
Jul 12, 11:07 AM CDT	Severe Thunderstorm Warning	LIX	Jefferson	8 min
Jul 12, 11:14 AM CDT	Special Weather Statement	LIX	Saint Tammany	46 min
Jul 12, 11:49 AM CDT	Special Weather Statement	LIX	Orleans	26 min
Jul 12, 11:56 AM CDT	Special Marine Warning	LIX		49 min
Jul 12, 12:05 PM CDT	Areal Flood Advisory	LIX	Saint Tammany	115 min
Jul 12, 12:15 PM CDT	Special Marine Warning	LIX		60 min
Jul 12, 12:23 PM CDT	Special Weather Statement	LIX	Jefferson, Lafourche	67 min
Jul 12, 1:11 PM CDT	Special Marine Warning	LIX		64 min
Jul 12, 1:43 PM CDT	Special Marine Warning	LIX		62 min
Jul 12, 2:13 PM CDT	Special Marine Warning	LIX		62 min
Jul 12, 3:11 PM CDT	Special Marine Warning	LIX		64 min
Jul 12, 4:10 PM CDT	Special Marine Warning	LIX		65 min
Jul 11, 7:32 PM CDT	River Flood Warning	LIX	Harrison	38 hr
Jul 12, 6:01 AM CDT	River Flood Warning	LIX	Pearl River	38 hr
Jul 12, 10:17 AM CDT	Special Weather Statement	LIX	Pearl River	43 min

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; radar from the NEXRAD Level II archive.