Alert archive / Mississippi / Flash Flood Watches in 2015

Flash Flood Watch 7, NWS Jackson, MS

October 25, 201523 counties in Mississippi; 8 parishes in Louisiana

NWS Jackson, MS issued this flash flood watch at Oct 25, 2015, 3:50 AM CDT for 23 counties in Mississippi; 8 parishes in Louisiana. It was in force for 30 hr.

The area

The counties it named.

The facts

Issued: Oct 25, 2015, 3:50 AM CDT (08:50 UTC)
Expired: Oct 26, 2015, 10:19 AM CDT
In force: 30 hr
Issued by: NWS Jackson, MS
Flood severity: None

All 31 counties

Catahoula Parish, LA, Concordia Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Madison Parish, LA, Richland Parish, LA, Tensas Parish, LA, West Carroll Parish, LA, Adams County, MS, Claiborne County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, Hinds County, MS, Humphreys County, MS, Issaquena County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lawrence County, MS, Lincoln County, MS, Madison County, MS, Marion County, MS, Rankin County, MS, Sharkey County, MS, Simpson County, MS, Smith County, MS, Warren County, MS, Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 63 km from the middle of the area, began a volume at 08:53 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

Slidell Radar S, LA (KSIL), launched 00:00Z, 8.8 hours before the alert went out and 214 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: 200 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 645 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 126 m²/s²
0-3 km storm-relative helicity: 168 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.5

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Jackson, MS wrote its last area forecast discussion before this flash flood watch went out at Oct 24, 9:48 PM CDT, 6 hours 2 minutes earlier.

Area forecast discussion, Oct 24, 9:48 PM CDT, 6 hours 2 minutes before

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Nearby

Flash Flood Watches in Mississippi, 2015 Flash Flood Watches in Louisiana, 2015 Every flash flood watch in 2015

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.