Alert archive / Mississippi / Flash Flood Warnings in 2021

Flash Flood Warning 21, NWS Jackson, MS

May 9, 20217 counties in Mississippi

NWS Jackson, MS issued this flash flood warning at May 9, 2021, 10:34 PM CDT for 7 counties in Mississippi. It was in force for 78 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 9, 2021, 10:34 PM CDT (03:34 UTC)
Expired: May 9, 2021, 11:52 PM CDT
In force: 78 min
Issued by: NWS Jackson, MS
Area: Storm-based polygon
Flood severity: None

Counties Carroll County, MS, Choctaw County, MS, Clay County, MS, Lowndes County, MS, Montgomery County, MS, Oktibbeha County, MS, Webster County, MS

The radar

The Columbus AFB radar (KGWX), 75 km from the middle of the area, began a volume at 03:36 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, 3.6 hours before the alert went out and 167 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: 762 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 787 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: -37 m²/s²
0-3 km storm-relative helicity: 81 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.6

Open this sounding in Storm Lab

The text

As transmitted.

138 
WGUS54 KJAN 100334
FFWJAN
MSC015-019-025-087-097-105-155-100630-
/O.NEW.KJAN.FF.W.0021.210510T0334Z-210510T0630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Jackson MS
1034 PM CDT Sun May 9 2021

The National Weather Service in Jackson has issued a

* Flash Flood Warning for...
  Choctaw County in central Mississippi...
  Southern Carroll County in north central Mississippi...
  Montgomery County in north central Mississippi...
  Webster County in north central Mississippi...
  Clay County in northeastern Mississippi...
  Lowndes County in northeastern Mississippi...
  Oktibbeha County in northeastern Mississippi...

* Until 130 AM CDT.

* At 1034 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 3 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...
  Starkville, Columbus, West Point, Winona, Columbus AFB, Black 
  Hawk, Eupora, Ackerman, Caledonia, Maben, Vaiden, Kilmichael, 
  Mathiston, Crawford, Sherwood, Reform, Longview, Pheba, Cumberland 
  and Clarkson.

Additional rainfall amounts of 1 to 2 inches are possible in the 
warned area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3332 9010 3359 8961 3367 8931 3374 8872
      3368 8872 3367 8850 3365 8851 3369 8837
      3374 8832 3374 8825 3329 8830 3329 8970
      3321 8975

FLASH FLOOD...RADAR INDICATED

$$

EC

1 follow-up statement

738 
WGUS74 KJAN 100452
FFSJAN

Flash Flood Statement
National Weather Service Jackson MS
1152 PM CDT Sun May 9 2021

MSC015-019-025-087-097-105-155-100502-
/O.CAN.KJAN.FF.W.0021.000000T0000Z-210510T0630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Carroll MS-Choctaw MS-Clay MS-Lowndes MS-Montgomery MS-Oktibbeha MS-
Webster MS-
1152 PM CDT Sun May 9 2021

...FLASH FLOOD WARNING IS CANCELLED FOR CHOCTAW, SOUTHERN CARROLL, 
MONTGOMERY, WEBSTER, CLAY, LOWNDES AND OKTIBBEHA COUNTIES...

Rain continues, but heavy rain that could result in flash flooding 
has ended. Flooding is no longer expected to pose a threat. Please 
heed any road closures.

LAT...LON 3332 9010 3359 8961 3367 8931 3374 8872
      3368 8872 3367 8850 3365 8851 3369 8837
      3374 8832 3374 8825 3329 8830 3329 8970
      3321 8975

$$

EC

The office that day

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

Issued	Product	Office	Counties	Lasted
May 9, 7:32 PM CDT	Severe Thunderstorm Warning	JAN	Bolivar, Sunflower	73 min
May 9, 7:57 PM CDT	Severe Thunderstorm Warning	JAN	Clay, Webster	43 min
May 9, 8:21 PM CDT	Severe Thunderstorm Warning	JAN	Lowndes	28 min
May 9, 8:55 PM CDT	Special Weather Statement	JAN	Issaquena	35 min
May 9, 9:06 PM CDT	Severe Thunderstorm Warning	JAN	Issaquena, Sharkey, Washington	39 min
May 9, 9:36 PM CDT	Severe Thunderstorm Warning	JAN	Yazoo	37 min
May 9, 9:45 PM CDT	Severe Thunderstorm Warning	JAN	Issaquena, Sharkey	60 min
May 9, 10:12 PM CDT	Severe Thunderstorm Warning	JAN	Warren, Yazoo	62 min
May 9, 10:16 PM CDT	Severe Thunderstorm Warning	JAN	Holmes, Humphreys, Yazoo	35 min
May 9, 10:24 PM CDT	Flash Flood Warning	JAN	Holmes, Humphreys, Sharkey, Yazoo	86 min
May 9, 10:38 PM CDT	Severe Thunderstorm Warning	JAN	Hinds, Madison, Rankin	82 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.