Flash Flood Warning 79, NWS New Orleans, LA

858 
WGUS54 KLIX 181554
FFWLIX
MSC109-181900-
/O.EXT.KLIX.FF.W.0079.000000T0000Z-260618T1900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New Orleans LA
1054 AM CDT Thu Jun 18 2026

...FLASH FLOOD EMERGENCY FOR PICAYUNE AND NICHOLSON, MISSISSIPPI...

The National Weather Service in New Orleans has extended the

* Flash Flood Warning for...
  South Central Pearl River County in southern Mississippi...

* Until 200 PM CDT.

* At 1054 AM CDT, local law enforcement dispatch reported water is
  approaching homes and businesses. Multiple roads are closed due to
  flooding including US Highway 11 and Interstate 59 near Picayune.
  Between 7 and 10 inches of rain have fallen. Additional rainfall
  amounts of 3 to 6 inches are possible in the warned area.

  FLASH FLOOD EMERGENCY for Picayune and Nicholson, Mississippi. This
  is a PARTICULARLY DANGEROUS SITUATION. SEEK HIGHER GROUND NOW!

  HAZARD...Life threatening flash flooding. Thunderstorms producing
           flash flooding.

  SOURCE...Law enforcement reported.

  IMPACT...This is a PARTICULARLY DANGEROUS SITUATION. SEEK HIGHER
           GROUND NOW! Life threatening flash flooding of low water
           crossings, small creeks and streams, urban areas,
           highways, streets and underpasses.

* Some locations that will experience flash flooding include...
  Picayune.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to higher ground now! This is an extremely dangerous and
life-threatening situation. Do not attempt to travel unless you are
fleeing an area subject to flooding or under an evacuation order.

Stay away or be swept away. River banks and culverts can become
unstable and unsafe.

Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.

&&

LAT...LON 3053 8978 3062 8966 3052 8954 3052 8960
      3050 8960 3050 8965 3046 8965 3046 8969
      3048 8971 3048 8972 3049 8972 3050 8974
      3050 8975 3052 8976 3051 8977 3053 8977

FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CATASTROPHIC

$$

TJS

220 
WGUS54 KLIX 181836
FFWLIX
MSC109-182030-
/O.EXT.KLIX.FF.W.0079.000000T0000Z-260618T2030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New Orleans LA
136 PM CDT Thu Jun 18 2026

...FLASH FLOOD EMERGENCY FOR PICAYUNE AND NICHOLSON, MISSISSIPPI...

The National Weather Service in New Orleans has extended the

* Flash Flood Warning for...
  South Central Pearl River County in southern Mississippi...

* Until 330 PM CDT.

* At 136 PM CDT, local law enforcement reported water is approaching
  homes and businesses. Multiple roads are closed due to flooding
  including US Highway 11 and Interstate 59 near Picayune. Between 8
  and 11 inches of rain have fallen. Additional rainfall amounts up
  to 1 inch are possible in the warned area.

  FLASH FLOOD EMERGENCY for Picayune and Nicholson, Mississippi. This
  is a PARTICULARLY DANGEROUS SITUATION. SEEK HIGHER GROUND NOW!

  HAZARD...Life threatening flash flooding. Thunderstorms producing
           flash flooding.

  SOURCE...Law enforcement reported.

  IMPACT...This is a PARTICULARLY DANGEROUS SITUATION. SEEK HIGHER
           GROUND NOW! Life threatening flash flooding of low water
           crossings, small creeks and streams, urban areas,
           highways, streets and underpasses.

* Some locations that will experience flash flooding include...
  Picayune and Nicholson.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to higher ground now! This is an extremely dangerous and
life-threatening situation. Do not attempt to travel unless you are
fleeing an area subject to flooding or under an evacuation order.

Stay away or be swept away. River banks and culverts can become
unstable and unsafe.

Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.

&&

LAT...LON 3053 8978 3062 8966 3052 8954 3052 8960
      3050 8960 3050 8965 3046 8965 3046 8969
      3048 8971 3048 8972 3049 8972 3050 8974
      3050 8975 3052 8976 3051 8977 3053 8977

FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CATASTROPHIC

$$

TJS

217 
WGUS74 KLIX 182028 RRA
FFSLIX

Flash Flood Statement
National Weather Service New Orleans LA
328 PM CDT Thu Jun 18 2026

MSC109-182038-
/O.EXP.KLIX.FF.W.0079.000000T0000Z-260618T2030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pearl River MS-
328 PM CDT Thu Jun 18 2026

...FLASH FLOOD WARNING WILL EXPIRE AT 330 PM CDT THIS AFTERNOON FOR
SOUTH CENTRAL PEARL RIVER COUNTY...

The heavy rain has ended. An areal flood warning remains in effect
for southeastern St. Tammany Parish and Hancock, northern Harrison,
and southeastern Pearl River Counties where ongoing significant
flooding continues caused by rises in creeks and rivers. Please
continue to heed remaining road closures.

A Flood Watch remains in effect until 700 AM CDT Friday for portions
of southeast Louisiana and southern Mississippi.

&&

LAT...LON 3053 8978 3062 8966 3052 8954 3052 8960
      3050 8960 3050 8965 3046 8965 3046 8969
      3048 8971 3048 8972 3049 8972 3050 8974
      3050 8975 3052 8976 3051 8977 3053 8977

$$

TJS

Area Forecast Discussion
National Weather Service New Orleans LA
618 AM CDT Thu Jun 18 2026

...New AVIATION...

.KEY MESSAGES...
Updated at 613 AM CDT Thu Jun 18 2026

- Potential for Life Threatening Flash Flooding. A Particularly
  Dangerous and Life Threatening Flash Flood Situation exists with
  a High Risk of Flooding across portions of south Mississippi and
  southeast Louisiana, especially east of Interstate 55.
  Considerable Flash Flooding is likely and Catastrophic Flash
  Flooding is possible today.

- A Flood Watch is in effect through Friday morning for most of
  southeast Louisiana as well as all of southwest and coastal
  Mississippi.

- Tornado Watch 348 in effect until 6 AM CDT for most of the area.

- Dangerous conditions for mariners of small craft and minor
  coastal flooding on south facing shores west of the Mississippi
  River will persist through tonight as Post Tropical Cyclone
  Arthur moves into southwest Louisiana.

- Extreme heat is expected this weekend. Heat advisories will
  likely be issued for heat index values of around 110 degrees.

&&

.UPDATE...
Issued at 354 AM CDT Thu Jun 18 2026

Updated Key Messages for WPC's High Risk of Excessive Rainfall
today for portions of the area. Likely to have a fairly large
stripe of 6 to 10 inch rainfall with isolated totals significantly
higher from Houma and Thibodaux northeastward.

&&

.SHORT TERM...
(Now through Sunday)
Issued at 1220 AM CDT Thu Jun 18 2026

Post Tropical Cyclone Arthur has degenerated to a low pressure
area along the Upper Texas Coast. The remnants will continue to
track across western Louisiana overnight and will reach the
Carolinas coastlines by Friday morning. We've already seen some
rotation in radar data, and expect we'll have short-lived spinups
overnight. Additionally, we remain highly concerned about extreme
rainfall amounts overnight. We already had 2.3 inch precipitable
water values at 00z, with guidance indicating that values near 2.6
inches are possible/likely overnight as a 35-40 knot low level jet
plugs in. The 02Z HRRR, for instance, has a large area of rainfall
totals in excess of 6 inches across the area by mid-afternoon
Thursday with spot totals approaching or exceeding 10 inches. If
these totals, or anything close are realized, we're probably
looking at major flooding in those areas. No changes to Flood
Watch anticipated. Could still be scattered precipitation into
Thursday evening associated with this system before we start
seeing some slight drying.

With precipitable water values remaining near 2 inches through
Sunday, still plenty of moisture available for scattered
convection, even without large scale forcing to aid in producing
lift. The large scale heavy rainfall threat will diminish beyond
Thursday evening, but localized heavy rain still possible. Could
also see a few microbursts on Friday.

A second issue over the weekend will be heat stress. We'll likely
see at least some sunshine at times Friday through the weekend
that will allow temperatures to get into the lower, or possibly
middle 90s in many areas. With dew points likely in the upper 70s
to near 80, and lots of residual moisture on the ground, it's
going to be steamy. Likely to have heat index values near our 108
degree criteria for Heat Advisories in many areas on Friday and
possibly again on Sunday. This will be addressed once we get past
the rainfall and tornado issues this morning. Overnight lows may
have trouble getting below 80 degrees for several nights.

&&

.LONG TERM...
(Sunday night through Wednesday)
Issued at 1220 AM CDT Thu Jun 18 2026

Ridging sets up over the northern Gulf for the first half of next
week. However, shortwaves will be tracking west to east just north
of the local area. If we are going to have a day that is
completely dry, it'll probably be Monday. Similar to the weekend,
we'll have to monitor for potential Heat Advisories, especially
Monday. For Tuesday and Wednesday, the question will be exactly
when storms develop. If they develop early enough in the day, that
would blunt the heat somewhat. For now, will stick with the NBM
forecast temperatures with several days seeing highs in the lower
and middle 90s.

&&

.AVIATION...
(12Z TAFS)
Issued at 613 AM CDT Thu Jun 18 2026

Large area of SHRA/TSRA moving across most terminals early this
morning with IFR or lower conditions. Main exceptions are KHUM and
KBTR, where convection has moved east for now. Eastern terminals
could still see gusts to around 40 knots as convection moves
through. The current area of convection should be east of all
terminals by 18z, but with abundant moisture still in place,
afternoon heating could redevelop TSRA. Expect any remaining
precipitation to dissipate after sunset, but MVFR ceilings could
redevelop before sunrise.

&&

.MARINE...
Issued at 1220 AM CDT Thu Jun 18 2026

Strong southerly winds of 20 to 25 knots with gusts of 30 knots
will remain in place over the coastal waters through tonight and
into Thursday and seas of 6 to 9 feet can be expected in the open
Gulf waters. Small craft advisories remain in effect due to these
conditions. Moving into the weekend and early next week, a broad
area of high pressure will build back over the eastern Gulf
waters. Persistent onshore winds of 10 to 15 knots and seas of 2
to 4 feet can be expected from Friday through early next week.

&&

.LIX WATCHES/WARNINGS/ADVISORIES...
LA...Flood Watch through Friday morning for LAZ034>037-039-046>048-
     056>058-064-071-076>087-089-090-092-094-096-098>100.

GM...Small Craft Advisory until 6 AM CDT Friday for GMZ529-531>536-
     541-543-551-553-554-557-570-572-575-577.

MS...Flood Watch through Friday morning for MSZ068>071-077-083>088.

GM...Small Craft Advisory until 6 AM CDT Friday for GMZ531>536-541-
     543-551-553-554-557-570-572-575-577.

&&

SHORT TERM...RW
LONG TERM....RW
AVIATION...RW
MARINE...RW

Preliminary Local Storm Report
National Weather Service New Orleans LA
822 AM CDT Thu Jun 18 2026

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

0535 AM     Tstm Wnd Dmg     1 NW Avondale           29.91N 90.20W
06/18/2026                   Jefferson          LA   Broadcast Media

            Report of destroyed mobile home in Avondale.

&&

MEFFER

Preliminary Local Storm Report
National Weather Service New Orleans LA
825 AM CDT Thu Jun 18 2026

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

0824 AM     Tstm Wnd Dmg     3 NE Slidell            30.31N 89.75W
06/18/2026                   St. Tammany        LA   Public

            Picture on social media showed water in cars
            parked along Brownswitch in Slidell.

&&

MEFFER

Preliminary Local Storm Report
National Weather Service New Orleans LA
827 AM CDT Thu Jun 18 2026

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

0826 AM     Tstm Wnd Dmg     4 ENE Slidell           30.29N 89.72W
06/18/2026                   St. Tammany        LA   Broadcast Media

            Significant flooding in Crossgates
            neighborhood in Slidell. Water encroaching
            on homes.

&&

MEFFER

Preliminary Local Storm Report
National Weather Service New Orleans LA
828 AM CDT Thu Jun 18 2026

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

0820 AM     Flash Flood      1 SSW Picayune          30.52N 89.68W
06/18/2026                   Pearl River        MS   Emergency Mngr

            Water over the roads at the intersection of
            Main Street and Jarrell.

&&

JFL

Preliminary Local Storm Report
National Weather Service New Orleans LA
841 AM CDT Thu Jun 18 2026

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

0819 AM     Flash Flood      2 ESE Picayune          30.52N 89.65W
06/18/2026                   Pearl River        MS   Public

            Jeff Wheat Rd closed due to flooding.

&&

JFL

Preliminary Local Storm Report
National Weather Service New Orleans LA
903 AM CDT Thu Jun 18 2026

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

0900 AM     Tstm Wnd Dmg     10 NNE Kiln             30.53N 89.35W
06/18/2026                   Hancock            MS   Emergency Mngr

            Trees on house. Occupants were rescued.

&&

LNN