Alert archive / Missouri / Areal Flood Warnings in 2017

Areal Flood Warning 17, NWS St. Louis, MO

May 1, 20177 counties in Missouri; Randolph County, Illinois

NWS St. Louis, MO issued this areal flood warning at May 1, 2017, 4:42 PM CDT for 7 counties in Missouri; Randolph County, Illinois. 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: May 1, 2017, 4:42 PM CDT (21:42 UTC)
Expired: May 2, 2017, 4:45 PM CDT
In force: 24 hr
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Flood severity: None

Counties Randolph County, IL, Crawford County, MO, Iron County, MO, Madison County, MO, Reynolds County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 105 km from the middle of the area, began a volume at 21:41 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 12:00Z, 9.7 hours before the alert went out and 317 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1214 m above ground
0-6 km bulk shear: 76 kt
0-1 km storm-relative helicity: 40 m²/s²
0-3 km storm-relative helicity: 114 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 St. Louis, MO wrote its last area forecast discussion before this areal flood warning went out at May 1, 3:05 PM CDT, 1 hour 37 minutes earlier.

Area forecast discussion, May 1, 3:05 PM CDT, 1 hour 37 minutes before

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Hazardous weather outlook, May 1, 3:31 PM CDT, 1 hour 11 minutes before

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In the hours before

Local storm report, May 1, 1:30 PM CDT, 3 hours 12 minutes before

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Local storm report, May 1, 1:50 PM CDT, 2 hours 52 minutes before

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Local storm report, May 1, 3:16 PM CDT, 1 hour 26 minutes before

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Local storm report, May 1, 3:24 PM CDT, 1 hour 18 minutes before

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Local storm report, May 1, 3:32 PM CDT, 1 hour 10 minutes before

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Local storm report, May 1, 3:42 PM CDT, 1 hour 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
Apr 30, 9:01 PM CDT	Areal Flood Warning	LSX	Franklin, Gasconade, Jefferson, Saint Charles, Sainte Genevieve, Saint Louis and 2 more	12 hr
Apr 30, 11:00 PM CDT	Areal Flood Warning	LSX	Audrain, Gasconade, Lincoln, Marion, Monroe, Montgomery and 4 more	12 hr
May 1, 4:16 AM CDT	Flash Flood Warning	LSX	Lincoln, Saint Charles	6 hr
May 1, 4:44 AM CDT	Areal Flood Warning	LSX	Crawford, Iron, Madison, Reynolds, Sainte Genevieve, Saint Francois and 1 more	12 hr
May 1, 8:59 AM CDT	Areal Flood Warning	LSX	Franklin, Gasconade, Jefferson, Saint Charles, Sainte Genevieve, Saint Louis and 2 more	4 days
May 1, 9:29 AM CDT	Areal Flood Warning	LSX	Audrain, Boone, Callaway, Cole, Moniteau, Osage	24 hr
May 1, 10:58 AM CDT	Areal Flood Warning	LSX	Audrain, Gasconade, Lincoln, Marion, Monroe, Montgomery and 4 more	24 hr
May 1, 9:58 AM CDT	Areal Flood Warning	LSX	Bond, Fayette, Greene, Jersey, Macoupin, Montgomery	24 hr

Nearby

Areal Flood Warnings in Missouri, 2017 Areal Flood Warnings in Illinois, 2017 Every areal 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.