Alert archive / Mississippi / Flash Flood Warnings in 2021

Flash Flood Warning 85, NWS Jackson, MS

August 30, 2021Covington County, Jefferson Davis County, Mississippi

NWS Jackson, MS issued this flash flood warning at Aug 30, 2021, 6:00 AM CDT for Covington County, Jefferson Davis County, Mississippi. It was in force for 4 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: Aug 30, 2021, 6:00 AM CDT (11:00 UTC)
Expired: Aug 30, 2021, 9:30 AM CDT
In force: 4 hr
Issued by: NWS Jackson, MS
Area: Storm-based polygon
Flood severity: None

Counties Covington County, MS, Jefferson Davis County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 79 km from the middle of the area, began a volume at 11:00 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
Aug 30, 7:40 AM CDT	FLASH FLOOD	2 Wnw Collins, MS	A CULVERT WAS WASHED OUT ON ORA WILLIAMSON RD.

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

The nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 11.0 hours before the alert went out and 86 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: 91 J/kg
Mixed-layer CIN: -62 J/kg
Mixed-layer LCL: 697 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 226 m²/s²
0-3 km storm-relative helicity: 209 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

125 
WGUS54 KJAN 301100
FFWJAN
MSC031-065-301430-
/O.NEW.KJAN.FF.W.0085.210830T1100Z-210830T1430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Jackson MS
600 AM CDT Mon Aug 30 2021

The National Weather Service in Jackson has issued a

* Flash Flood Warning for...
  Jefferson Davis County in south central Mississippi...
  Covington County in southeastern Mississippi...

* Until 930 AM CDT.

* At 600 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 4 inches of rain 
  have fallen. Additional rainfall amounts of 1 to 2 inches are 
  possible in the warned area. Flash flooding is ongoing or expected 
  to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Collins, Prentiss, Mount Olive, Lone Star, Carson, Clem, Melba, 
  Progress, Society Hill, Sanford, Seminary and Bassfield.

This includes the following streams and drainages...
  Shelton Creek, West Bowie Creek, East Prong Silver Creek, Bear 
  Bay, Greens Creek, Dry Creek, Jaybird Creek, Oakey Woods Creek, 
  Caney Head Creek, Pierce Creek, Beaver Branch, Bouie River, 
  Mitchell Branch, Oakohay Creek, Cypress Creek, Pearl River, 
  Holiday Creek, Gwinville Branch, Fiddlers Creek, Black Creek, 
  Terrible Creek, Lower Prong, Martin Branch, Okatoma Creek, Hooker 
  Hollow Creek, Partman Branch, White Sand Creek, Shelby Creek, 
  Monroe Creek, McCall Creek, Burtons Creek, Hutchens Branch, Silver 
  Creek, Choctaw Creek, Easterling Branch, East Fork Greens Creek, 
  Blakely Creek, Hartley Branch, Tick Creek, Santee Branch, Gabby 
  Reed Brake and West Prong Silver Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3175 8997 3176 8997 3179 8940 3143 8940
      3143 8982 3139 8982 3140 8996

FLASH FLOOD...RADAR INDICATED

$$

CME

The office that day

Everything else NWS Jackson, MS issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 30, 3:32 AM CDT	Flash Flood Warning	JAN	Forrest, Lamar, Marion	6 hr
Aug 30, 5:35 AM CDT	Flash Flood Warning	JAN	Lawrence, Lincoln	3 hr
Aug 30, 6:41 AM CDT	Flash Flood Warning	JAN	Copiah, Simpson	4 hr
Aug 30, 7:08 AM CDT	Flash Flood Warning	JAN	Jones	4 hr
Aug 30, 8:14 AM CDT	Flash Flood Warning	JAN	Rankin, Smith	4 hr
Aug 30, 8:21 AM CDT	Flash Flood Warning	JAN	Rankin, Smith	4 hr
Aug 30, 8:33 AM CDT	Flash Flood Warning	JAN	Covington, Hinds, Jasper, Jones, Rankin, Scott and 2 more	4 hr
Aug 30, 12:38 PM CDT	Special Weather Statement	JAN	Madison	22 min
Aug 30, 3:17 PM CDT	Flash Flood Warning	JAN	Lauderdale	118 min
Aug 30, 4:33 PM CDT	Flash Flood Warning	JAN	Kemper, Noxubee	2 hr
Aug 30, 5:01 PM CDT	Flash Flood Warning	JAN	Clarke, Lauderdale	3 hr

Nearby

Flash Flood Warnings in Mississippi, 2021 Every flash flood warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.