Alert archive / Missouri / Areal Flood Advisories in 2021

Areal Flood Advisory 26, NWS St. Louis, MO

July 1, 2021Marion County, Monroe County, Shelby County, Missouri

NWS St. Louis, MO issued this areal flood advisory at Jul 1, 2021, 2:57 AM CDT for Marion County, Monroe County, Shelby County, Missouri. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: Jul 1, 2021, 2:57 AM CDT (07:57 UTC)
Expired: Jul 1, 2021, 6:00 AM CDT
In force: 3 hr
Issued by: NWS St. Louis, MO
Area: Storm-based polygon

Counties Marion County, MO, Monroe County, MO, Shelby County, MO

The radar

The St Louis radar (KLSX), 153 km from the middle of the area, began a volume at 07:57 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

Lincoln, IL (KILX), launched 00:00Z, 8.0 hours before the alert went out and 286 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: 573 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 892 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 44 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

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 St. Louis, MO wrote its last area forecast discussion before this areal flood advisory went out at Jul 1, 12:32 AM CDT, 2 hours 25 minutes earlier.

Area forecast discussion, Jul 1, 12:32 AM CDT, 2 hours 25 minutes before

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Hazardous weather outlook, Jun 30, 7:51 PM CDT, 7 hours 6 minutes before

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In the hours before

Local storm report, Jun 30, 9:15 PM CDT, 5 hours 42 minutes before

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Local storm report, Jun 30, 9:54 PM CDT, 5 hours 3 minutes before

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The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 30, 8:41 PM CDT	Areal Flood Advisory	LSX	Saint Charles	3 hr
Jun 30, 10:44 PM CDT	Areal Flood Advisory	LSX	Monroe, Ralls	7 hr
Jul 1, 12:12 AM CDT	Areal Flood Advisory	LSX	Marion, Shelby	23 min
Jul 1, 12:35 AM CDT	Flash Flood Warning	LSX	Marion, Shelby	3 hr
Jul 1, 3:21 AM CDT	Areal Flood Advisory	LSX	Marion, Shelby	2 hr
Jul 1, 5:16 AM CDT	Areal Flood Advisory	LSX	Callaway, Montgomery, Warren	3 hr
Jul 1, 5:51 AM CDT	Areal Flood Advisory	LSX	Saint Charles	3 hr
Jul 1, 6:04 AM CDT	Areal Flood Advisory	LSX	Boone, Callaway, Cole, Moniteau	28 min
Jul 1, 6:32 AM CDT	Flash Flood Warning	LSX	Boone, Callaway, Cole, Moniteau	3 hr
Jul 1, 6:59 AM CDT	River Flood Warning	LSX	Monroe	37 hr
Jul 1, 8:21 AM CDT	River Flood Warning	LSX	Cole	32 hr
Jul 1, 11:54 AM CDT	River Flood Warning	LSX	Lincoln	27 hr
Jun 30, 8:55 PM CDT	River Flood Warning	LSX	Brown	21 days
Jul 1, 11:28 AM CDT	River Flood Warning	LSX	Morgan, Pike	21 days
Jul 1, 11:30 AM CDT	River Flood Warning	LSX	Calhoun, Greene, Jersey	21 days

Nearby

Areal Flood Advisories in Missouri, 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.