Alert archive / Mississippi / Flash Flood Warnings in 2017

Flash Flood Warning 47, NWS Jackson, MS

May 30, 2017Winston County, Mississippi

NWS Jackson, MS issued this flash flood warning at May 30, 2017, 2:47 PM CDT for Winston County, Mississippi. It was in force for 118 min. 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: May 30, 2017, 2:47 PM CDT (19:47 UTC)
Expired: May 30, 2017, 4:45 PM CDT
In force: 118 min
Issued by: NWS Jackson, MS
Area: Storm-based polygon
Flood severity: None

County Winston County, MS

The radar

The Columbus AFB radar (KGWX), 113 km from the middle of the area, began a volume at 19:46 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
May 30, 3:40 PM CDT	FLASH FLOOD	3 Sw Louisville, MS	THE SOIL UNDERNEATH PART OF HWY 25 S IS WASHING AWAY DUE TO HEAVY RAINS. ONE LANE IS BEING CLOSED OFF.

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, 7.8 hours before the alert went out and 127 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: 208 J/kg
Mixed-layer CIN: -97 J/kg
Mixed-layer LCL: 1037 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 114 m²/s²
0-3 km storm-relative helicity: 75 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

As transmitted.

790 
WGUS54 KJAN 301947
FFWJAN
MSC159-302145-
/O.NEW.KJAN.FF.W.0047.170530T1947Z-170530T2145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Jackson MS
247 PM CDT TUE MAY 30 2017

The National Weather Service in Jackson has issued a

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

* Until 445 PM CDT

* At 246 PM CDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Up to three inches of rain have
  already fallen. Flash flooding is expected to begin shortly.

* Some locations that will experience flooding include...
  Louisville and Millcreek. 

Additional rainfall amounts of one to two 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 3308 8882 3294 8931 3310 8930 3311 8926
      3311 8922 3313 8921 3325 8881

$$

DB

The office that day

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

Issued	Product	Office	Counties	Lasted
May 30, 12:25 PM CDT	Special Weather Statement	JAN	Lowndes	35 min
May 30, 5:10 PM CDT	Flash Flood Warning	JAN	Madison, Yazoo	2 hr

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.