Alert archive / Mississippi / Flash Flood Warnings in 2021

Flash Flood Warning 4, NWS Jackson, MS

February 17, 2021Yazoo County, Mississippi

NWS Jackson, MS issued this flash flood warning at Feb 17, 2021, 6:39 PM CST for Yazoo County, Mississippi. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Feb 17, 2021, 6:39 PM CST (00:39 UTC)
Expired: Feb 17, 2021, 8:45 PM CST
In force: 2 hr
Issued by: NWS Jackson, MS
Area: Storm-based polygon
Flood severity: None

County Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 80 km from the middle of the area, began a volume at 00:42 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.

The nearest sounding before it

Little Rock, AR (KLZK), launched 00:00Z, 0.7 hours before the alert went out and 228 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 544 m above ground
0-6 km bulk shear: 96 kt
0-1 km storm-relative helicity: 185 m²/s²
0-3 km storm-relative helicity: 129 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

810 
WGUS54 KJAN 180039
FFWJAN
MSC163-180245-
/O.NEW.KJAN.FF.W.0004.210218T0039Z-210218T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Jackson MS
639 PM CST Wed Feb 17 2021

The National Weather Service in Jackson has issued a

* Flash Flood Warning for...
  Yazoo County in central Mississippi...

* Until 845 PM CST.

* At 637 PM CST, the public reported thunderstorms producing heavy 
  rain across the warned area. Flash flooding is ongoing or expected 
  to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Public. MDOT traffic source reported flooding on US
           49.

  IMPACT...Flooding of small creeks and streams, urban areas,
           highways, streets and underpasses as well as other
           drainage and low lying areas.

* Some locations that will experience flash flooding include...
  Yazoo City, Benton, Tinsley, Little Yazoo, Myrleville, Phoenix, 
  Holly Bluff, Bentonia, Eden and Satartia.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3292 9045 3293 9045 3300 9031 3277 9004
      3256 9055 3281 9071 3281 9070 3281 9069
      3282 9072 3285 9074

FLASH FLOOD...OBSERVED

$$

JNE

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 18, 6:25 AM CST	Winter Weather Advisory	JAN	Adams, Attala, Bolivar, Carroll, Choctaw, Claiborne and 32 more	14 hr
Feb 18, 9:24 AM CST	Hard Freeze Warning	JAN	Adams, Attala, Bolivar, Carroll, Choctaw, Claiborne and 17 more	27 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.