Alert archive / Mississippi / Flash Flood Warnings in 2018

Flash Flood Warning 40, NWS Mobile, AL

December 28, 2018Greene County, Perry County, Stone County, Mississippi

NWS Mobile, AL issued this flash flood warning at Dec 28, 2018, 2:26 AM CST for Greene County, Perry County, Stone County, Mississippi. It was in force for 3 hr. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Dec 28, 2018, 2:26 AM CST (08:26 UTC)
Expired: Dec 28, 2018, 5:30 AM CST
In force: 3 hr
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Flood severity: None

Counties Greene County, MS, Perry County, MS, Stone County, MS

The radar

The Mobile radar (KMOB), 76 km from the middle of the area, began a volume at 08:30 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.

What was reported inside it

Time	Report	Where	Remark
Dec 28, 5:00 AM CST	FLASH FLOOD	9 Nne Jonathan, MS	MAJOR WASHOUT ON OLD AVERA ROAD NEAR INDIAN HILL ROAD.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 8.4 hours before the alert went out and 106 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: 1187 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 480 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 365 m²/s²
0-3 km storm-relative helicity: 395 m²/s²
Significant tornado parameter: 2.5
Supercell composite: 14.9

Open this sounding in Storm Lab

The text

As transmitted.

381 
WGUS54 KMOB 280826
FFWMOB
MSC041-111-131-281130-
/O.NEW.KMOB.FF.W.0040.181228T0826Z-181228T1130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mobile AL
226 AM CST FRI DEC 28 2018

The National Weather Service in Mobile has issued a

* Flash Flood Warning for...
  Southern Perry County in southeastern Mississippi...
  Greene County in southeastern Mississippi...
  Stone County in southeastern Mississippi...

* Until 530 AM CST.

* At 225 AM CST, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Up to two inches of rain have
  already fallen. Flash flooding is expected to begin shortly.

* Some locations that will experience flooding include...
  Wiggins, Perkinston, McHenry, Beaumont, McLain and State Line. 

Additional rainfall amounts of 2 to 4 inches are possible in the 
warned area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

&&

LAT...LON 3091 8934 3091 8914 3109 8915 3144 8858
      3144 8845 3126 8844 3100 8880 3100 8884
      3091 8883 3091 8889 3068 8889 3068 8924
      3065 8924 3065 8934

$$

1 follow-up statement

821 
WGUS74 KMOB 281108
FFSMOB

Flash Flood Statement
National Weather Service Mobile AL
508 AM CST FRI DEC 28 2018

MSC131-281117-
/O.CAN.KMOB.FF.W.0040.000000T0000Z-181228T1130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Stone MS-
508 AM CST FRI DEC 28 2018

...THE FLASH FLOOD WARNING FOR STONE COUNTY IS CANCELLED...

Flooding is no longer expected to pose a threat. Please continue to
heed any remaining road closures.

LAT...LON 3096 8914 3109 8915 3144 8858 3144 8845
      3126 8844 3100 8884 3095 8883

$$

MSC041-111-281130-
/O.CON.KMOB.FF.W.0040.000000T0000Z-181228T1130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Perry MS-Greene MS-
508 AM CST FRI DEC 28 2018

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 530 AM CST FOR
SOUTHERN PERRY AND CENTRAL GREENE COUNTIES...

At 507 AM CST, Doppler radar indicated moderate rain continuing 
across the warned area. Up to four inches of rain have already 
fallen. Flash flooding is ongoing.

Some locations that will experience flooding include...
Beaumont, McLain and State Line. 

Additional rainfall amounts of around an inch are possible in the 
warned area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

&&

LAT...LON 3096 8914 3109 8915 3144 8858 3144 8845
      3126 8844 3100 8884 3095 8883

$$

The office that day

Everything else NWS Mobile, AL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 27, 6:13 PM CST	Flash Flood Warning	MOB	Perry, Wayne	6 hr
Dec 27, 6:32 PM CST	Flash Flood Warning	MOB	Greene, Wayne	6 hr
Dec 27, 7:55 PM CST	Flash Flood Warning Emergency	MOB	Greene, Perry, Wayne	7 hr
Dec 27, 8:13 PM CST	Special Weather Statement	MOB	Wayne	47 min
Dec 27, 9:41 PM CST	River Flood Warning	MOB	George, Greene, Jackson	15 days
Dec 28, 12:14 AM CST	Flash Flood Warning	MOB	Wayne	3 hr
Dec 28, 1:30 AM CST	Special Weather Statement	MOB	Perry	45 min
Dec 28, 1:43 AM CST	Special Weather Statement	MOB	Wayne	32 min
Dec 28, 2:47 AM CST	Tornado Warning	MOB	Greene, Wayne	28 min
Dec 28, 3:14 AM CST	Flash Flood Warning Emergency	MOB	Greene, Perry, Wayne	3 hr
Dec 28, 4:17 AM CST	Special Weather Statement	MOB	George	43 min
Dec 28, 4:27 AM CST	River Flood Warning	MOB	Perry	6 days
Dec 28, 4:45 AM CST	Severe Thunderstorm Warning	MOB	George, Greene	45 min
Dec 28, 4:52 AM CST	Areal Flood Advisory	MOB	George, Greene	3 hr
Dec 28, 6:11 AM CST	River Flood Warning	MOB	Greene, Wayne	3 days
Dec 28, 6:13 AM CST	Areal Flood Warning	MOB	Greene, Perry, Wayne	6 hr
Dec 28, 9:03 AM CST	Areal Flood Warning	MOB	George, Greene, Perry, Wayne	27 hr
Dec 28, 9:57 AM CST	River Flood Warning	MOB	Perry	21 days

Nearby

Flash Flood Warnings in Mississippi, 2018 Every flash flood warning in 2018

Sources

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