Alert archive / Mississippi / Flash Flood Warnings in 2021

Flash Flood Warning 94, NWS Jackson, MS

August 30, 2021Clay County, Lowndes County, Noxubee County, Mississippi

NWS Jackson, MS issued this flash flood warning at Aug 30, 2021, 7:03 PM CDT for Clay County, Lowndes County, Noxubee County, Mississippi. It was in force for 2 hr. 2 reports 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, 7:03 PM CDT (00:03 UTC)
Expired: Aug 30, 2021, 9:30 PM CDT
In force: 2 hr
Issued by: NWS Jackson, MS
Area: Storm-based polygon
Flood severity: None

Counties Clay County, MS, Lowndes County, MS, Noxubee County, MS

The radar

The Columbus AFB radar (KGWX), 82 km from the middle of the area, began a volume at 00:06 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, 8:45 PM CDT	FLASH FLOOD	2 Nw Columbus, MS	FLASH FLOODING REPORTED ON HOSPITAL DRIVE. WATER BACKED UP INTO A NEARBY APARTMENT COMPLEX.
Aug 30, 8:45 PM CDT	FLASH FLOOD	2 Wsw Columbus, MS	FLASH FLOODING REPORTED ON 4TH STREET S. WATER ENTERED A HOME.

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

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 0.1 hours before the alert went out and 168 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: 182 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 524 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 268 m²/s²
0-3 km storm-relative helicity: 284 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

As transmitted.

270 
WGUS54 KJAN 310003
FFWJAN
MSC025-087-103-310230-
/O.NEW.KJAN.FF.W.0094.210831T0003Z-210831T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

The National Weather Service in Jackson has issued a

* Flash Flood Warning for...
  Noxubee County in east central Mississippi...
  Southeastern Clay County in northeastern Mississippi...
  Lowndes County in northeastern Mississippi...

* Until 930 PM CDT.

* At 703 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 3 inches of rain 
  have fallen. Additional rainfall amounts of 1 to 3 inches are 
  possible in the warned area. Flash flooding is ongoing or expected 
  to begin shortly.

  HAZARD...Flash flooding caused by rain bands producing heavy
           convective rainfall from Tropical Depression Ida.

  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...
  Columbus, Macon, Brooksville, Crawford, Deerbrook, Bigbee Valley, 
  Prairie Point, Bent Oak, Paulette, Tibbee, Cooksville, Waverly, 
  Steens, Shuqualak and Artesia.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3293 8868 3305 8869 3329 8868 3329 8867
      3356 8867 3358 8828 3293 8835

FLASH FLOOD...RADAR INDICATED

$$

JNE

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 30, 8:26 PM CDT	Areal Flood Warning	JAN	Clarke, Lauderdale	3 hr
Aug 30, 9:24 PM CDT	River Flood Warning	JAN	Simpson	40 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.