Alert archive / Mississippi / Areal Flood Warnings in 2018

Areal Flood Warning 18, NWS Mobile, AL

December 31, 2018Greene County, Perry County, Wayne County, Mississippi

NWS Mobile, AL issued this areal flood warning at Dec 31, 2018, 11:04 AM CST for Greene County, Perry County, Wayne County, Mississippi. It was in force for 24 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Dec 31, 2018, 11:04 AM CST (17:04 UTC)
Expired: Jan 1, 2019, 11:00 AM CST
In force: 24 hr
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Flood severity: None

Counties Greene County, MS, Perry County, MS, Wayne County, MS

The radar

The Mobile radar (KMOB), 90 km from the middle of the area, began a volume at 17:06 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 12:00Z, 5.1 hours before the alert went out and 164 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: 316 J/kg
Mixed-layer CIN: -25 J/kg
Mixed-layer LCL: 601 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 332 m²/s²
0-3 km storm-relative helicity: 423 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 2.5

Open this sounding in Storm Lab

What forecasters said that day

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

NWS Mobile, AL wrote its last area forecast discussion before this areal flood warning went out at Dec 30, 4:11 PM CST, 18 hours 53 minutes earlier.

Area forecast discussion, Dec 30, 4:11 PM CST, 18 hours 53 minutes before

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Hazardous weather outlook, Dec 30, 4:22 PM CST, 18 hours 42 minutes before

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The office that day

Everything else NWS Mobile, AL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 31, 10:22 AM CST	Marine Dense Fog Advisory	MOB		5 hr

Nearby

Areal Flood Warnings in Mississippi, 2018 Every areal flood warning in 2018

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.