Alert archive / Missouri / Areal Flood Advisories in 2021

Areal Flood Advisory 13, NWS Paducah, KY

March 17, 2021Alexander County, Pulaski County, Illinois; 4 counties in Missouri

NWS Paducah, KY issued this areal flood advisory at Mar 17, 2021, 11:31 AM CDT for Alexander County, Pulaski County, Illinois; 4 counties in Missouri. It was in force for 5 hr.

The area

The counties it named.

The facts

Issued: Mar 17, 2021, 11:31 AM CDT (16:31 UTC)
Expired: Mar 17, 2021, 4:30 PM CDT
In force: 5 hr
Issued by: NWS Paducah, KY
Area: Storm-based polygon

Counties Alexander County, IL, Pulaski County, IL, Mississippi County, MO, New Madrid County, MO, Scott County, MO, Stoddard County, MO

The radar

The Paducah radar (KPAH), 65 km from the middle of the area, began a volume at 16:31 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 12:00Z, 4.5 hours before the alert went out and 240 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: 18 J/kg
Mixed-layer CIN: -262 J/kg
Mixed-layer LCL: 1466 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 217 m²/s²
0-3 km storm-relative helicity: 186 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

What forecasters said that day

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

NWS Paducah, KY wrote its last area forecast discussion before this areal flood advisory went out at Mar 17, 6:17 AM CDT, 5 hours 14 minutes earlier.

Area forecast discussion, Mar 17, 6:17 AM CDT, 5 hours 14 minutes before

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Hazardous weather outlook, Mar 17, 3:11 AM CDT, 8 hours 20 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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        Please try again in a few minutes.
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The office that day

Everything else NWS Paducah, KY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 17, 2:21 AM CDT	Flash Flood Watch	PAH	Ballard, Carlisle, Fulton, Graves, Hickman, McCracken	23 hr
Mar 17, 3:30 PM CDT	Areal Flood Advisory	PAH	Calloway, Christian, Todd, Trigg	3 hr

Nearby

Areal Flood Advisories in Missouri, 2021 Areal Flood Advisories in Illinois, 2021 Every areal flood advisory 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.