Alert archive / Mississippi / Flash Flood Warnings in 2021

Flash Flood Warning 24, NWS Jackson, MS

June 6, 2021Simpson County, Mississippi

NWS Jackson, MS issued this flash flood warning at Jun 6, 2021, 9:28 AM CDT for Simpson 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: Jun 6, 2021, 9:28 AM CDT (14:28 UTC)
Expired: Jun 6, 2021, 12:30 PM CDT
In force: 3 hr
Issued by: NWS Jackson, MS
Area: Storm-based polygon
Flood severity: None

County Simpson County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 53 km from the middle of the area, began a volume at 14:26 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
Jun 6, 12:30 PM CDT	FLASH FLOOD	Saratoga, MS	CORRECTS TIME OF PREVIOUS FLASH FLOOD REPORT FROM SARATOGA. SEVERAL CREEKS OVERFLOWED ONTO NEARBY FIELDS ACROSS PORTIONS OF SOUTHERN SIMPSON COUNTY.

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 12:00Z, 2.5 hours before the alert went out and 58 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: 562 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 548 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 226 m²/s²
0-3 km storm-relative helicity: 236 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.9

Open this sounding in Storm Lab

The text

As transmitted.

436 
WGUS54 KJAN 061428
FFWJAN
MSC127-061730-
/O.NEW.KJAN.FF.W.0024.210606T1428Z-210606T1730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Jackson MS
928 AM CDT Sun Jun 6 2021

The National Weather Service in Jackson has issued a

* Flash Flood Warning for...
  Southeastern Simpson County in central Mississippi...

* Until 1230 PM CDT.

* At 928 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 3 and 5 inches of rain 
  have fallen. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Doppler radar.

  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...
  Magee, Pinola, Sanatorium and Shivers.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3179 9011 3188 9004 3192 8965 3178 8965
      3175 9012 3177 9013 3177 9011

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...2-3 INCHES IN 1 HOUR 

$$

TW

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 6, 3:01 AM CDT	Flash Flood Watch	JAN	Clarke, Covington, Forrest, Jasper, Jefferson Davis, Jones and 6 more	15 hr
Jun 6, 8:08 AM CDT	Flash Flood Warning	JAN	Jefferson Davis, Lawrence	4 hr
Jun 6, 9:52 AM CDT	Flash Flood Warning	JAN	Smith	3 hr
Jun 6, 11:03 AM CDT	Flash Flood Warning	JAN	Jefferson Davis, Lawrence	3 hr
Jun 6, 12:56 PM CDT	Flash Flood Warning	JAN	Covington, Jasper, Jefferson Davis, Jones, Smith	4 hr
Jun 6, 2:59 PM CDT	Flash Flood Warning	JAN	Jones	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.