Alert archive / Mississippi / Flash Flood Warnings in 2021

Flash Flood Warning 98, NWS Jackson, MS

September 17, 2021Issaquena County, Sharkey County, Mississippi

NWS Jackson, MS issued this flash flood warning at Sep 17, 2021, 10:05 PM CDT for Issaquena County, Sharkey County, Mississippi. It was in force for 2 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: Sep 17, 2021, 10:05 PM CDT (03:05 UTC)
Expired: Sep 18, 2021, 12:15 AM CDT
In force: 2 hr
Issued by: NWS Jackson, MS
Area: Storm-based polygon
Flood severity: None

Counties Issaquena County, MS, Sharkey County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 118 km from the middle of the area, began a volume at 03:04 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
Sep 17, 10:15 PM CDT	FLASH FLOOD	Rolling Fork, MS	A FEW STREETS FLOODED IN ROLLING FORK.

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, 3.1 hours before the alert went out and 108 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: 1971 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 754 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: 45 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

632 
WGUS54 KJAN 180305
FFWJAN
MSC055-125-180515-
/O.NEW.KJAN.FF.W.0098.210918T0305Z-210918T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Jackson MS
1005 PM CDT Fri Sep 17 2021

The National Weather Service in Jackson has issued a

* Flash Flood Warning for...
  North Central Issaquena County in west central Mississippi...
  Northwestern Sharkey County in west central Mississippi...

* Until 1215 AM CDT.

* At 1005 PM 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 3 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...
  Rolling Fork, Anguilla, Grace and Nitta Yuma.

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 3300 9102 3301 9100 3301 9092 3306 9091
      3306 9083 3293 9080 3286 9086 3287 9096
      3294 9103

FLASH FLOOD...RADAR INDICATED

$$

DL

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 17, 7:30 PM CDT	Special Weather Statement	JAN	Clay	60 min
Sep 17, 7:48 PM CDT	Special Weather Statement	JAN	Bolivar	57 min
Sep 17, 9:27 PM CDT	Flash Flood Warning	JAN	Lowndes	93 min
Sep 18, 2:30 PM CDT	Special Weather Statement	JAN	Lowndes	45 min
Sep 18, 3:41 PM CDT	Special Weather Statement	JAN	Forrest	49 min
Sep 18, 4:35 PM CDT	Flash Flood Warning	JAN	Forrest, Lamar	42 min
Sep 18, 4:49 PM CDT	Special Weather Statement	JAN	Winston	41 min

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.