Alert archive / Mississippi / Flash Flood Warnings in 2017

Flash Flood Warning 101, NWS Jackson, MS

July 29, 2017Choctaw County, Winston County, Mississippi

NWS Jackson, MS issued this flash flood warning at Jul 29, 2017, 1:18 AM CDT for Choctaw County, Winston County, Mississippi. It was in force for 4 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: Jul 29, 2017, 1:18 AM CDT (06:18 UTC)
Expired: Jul 29, 2017, 5:45 AM CDT
In force: 4 hr
Issued by: NWS Jackson, MS
Area: Storm-based polygon
Flood severity: None

Counties Choctaw County, MS, Winston County, MS

The radar

The Columbus AFB radar (KGWX), 109 km from the middle of the area, began a volume at 06:21 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

Jackson, MS (KJAN), launched 00:00Z, 6.3 hours before the alert went out and 131 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: 2496 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 1038 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 93 m²/s²
0-3 km storm-relative helicity: 161 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

424 
WGUS54 KJAN 290618
FFWJAN
MSC019-159-291045-
/O.NEW.KJAN.FF.W.0101.170729T0618Z-170729T1045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Jackson MS
118 AM CDT SAT JUL 29 2017

The National Weather Service in Jackson has issued a

* Flash Flood Warning for...
  Central Choctaw County in central Mississippi...
  Winston County in east central Mississippi...

* Until 545 AM CDT

* At 117 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Up to two to three inches of 
  rain have already fallen, especially across southern Choctaw & 
  northwest Winston County. Flash flooding is expected to begin 
  shortly.

* Some locations that will experience flooding include...
  Louisville, Ackerman, Chester, Betheden, Millcreek, Noxapater, Weir
  and French Camp.

Additional rainfall amounts of one to three 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.

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

&&

LAT...LON 3293 8889 3299 8919 3307 8932 3328 8932
      3329 8945 3344 8945 3343 8942 3344 8941
      3331 8909 3329 8908 3329 8900 3320 8881
      3293 8881

$$

DC

2 follow-up statements

219 
WGUS74 KJAN 290754
FFSJAN

Flash Flood Statement
National Weather Service Jackson MS
254 AM CDT SAT JUL 29 2017

MSC019-159-291045-
/O.CON.KJAN.FF.W.0101.000000T0000Z-170729T1045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Choctaw MS-Winston MS-
254 AM CDT SAT JUL 29 2017

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 545 AM CDT FOR
CENTRAL CHOCTAW AND WINSTON COUNTIES...

At 252 AM CDT, Doppler radar indicated thunderstorms produced heavy 
rain across the warned area earlier. Up to three inches of rain have 
already fallen. Flash flooding is expected to begin shortly.

Some locations that will experience flooding include...
Louisville, Ackerman, Chester, Betheden, Millcreek, Noxapater, Weir
and French Camp.

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 3293 8889 3299 8919 3307 8932 3328 8932
      3329 8945 3344 8945 3343 8942 3344 8941
      3331 8909 3329 8908 3329 8900 3320 8881
      3293 8881

$$

DC

885 
WGUS74 KJAN 290848
FFSJAN

Flash Flood Statement
National Weather Service Jackson MS
348 AM CDT SAT JUL 29 2017

MSC019-159-290858-
/O.CAN.KJAN.FF.W.0101.000000T0000Z-170729T1045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Choctaw MS-Winston MS-
348 AM CDT SAT JUL 29 2017

...THE FLASH FLOOD WARNING FOR CENTRAL CHOCTAW AND WINSTON COUNTIES
IS CANCELLED...

The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed any remaining road closures.

LAT...LON 3293 8889 3299 8919 3307 8932 3328 8932
      3329 8945 3344 8945 3343 8942 3344 8941
      3331 8909 3329 8908 3329 8900 3320 8881
      3293 8881

$$

19

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 28, 9:10 PM CDT	Special Weather Statement	JAN	Madison	35 min
Jul 28, 9:34 PM CDT	Special Weather Statement	JAN	Rankin	26 min
Jul 28, 9:58 PM CDT	Special Weather Statement	JAN	Newton, Rankin, Scott	47 min
Jul 28, 10:50 PM CDT	Special Weather Statement	JAN	Lauderdale, Newton	40 min
Jul 29, 1:23 AM CDT	Special Weather Statement	JAN	Rankin	52 min
Jul 29, 1:26 AM CDT	Special Weather Statement	JAN	Madison	34 min
Jul 29, 1:59 AM CDT	Special Weather Statement	JAN	Leake	46 min
Jul 29, 2:07 AM CDT	Special Weather Statement	JAN	Jasper, Newton, Smith	53 min
Jul 29, 2:44 AM CDT	Special Weather Statement	JAN	Clarke, Jasper, Lauderdale	61 min
Jul 29, 3:06 AM CDT	Special Weather Statement	JAN	Covington, Jefferson Davis, Jones	54 min
Jul 29, 3:37 AM CDT	Special Weather Statement	JAN	Claiborne	38 min
Jul 29, 3:41 AM CDT	Special Weather Statement	JAN	Forrest	49 min
Jul 29, 4:14 AM CDT	Special Weather Statement	JAN	Claiborne	46 min
Jul 29, 4:18 AM CDT	Severe Thunderstorm Warning	JAN	Claiborne, Warren	57 min
Jul 29, 4:36 AM CDT	Special Weather Statement	JAN	Simpson	24 min

Nearby

Flash Flood Warnings in Mississippi, 2017 Every flash flood warning in 2017

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.