Alert archive / Missouri / Flash Flood Watches in 2019

Flash Flood Watch 10, NWS St. Louis, MO

June 17, 201917 counties in Missouri; 9 counties in Illinois

NWS St. Louis, MO issued this flash flood watch at Jun 17, 2019, 3:16 AM CDT for 17 counties in Missouri; 9 counties in Illinois. It took effect at Jun 17, 2019, 7:00 AM CDT. It was in force for 14 hr.

The area

The counties it named.

The facts

Issued: Jun 17, 2019, 3:16 AM CDT (08:16 UTC)
In effect from: Jun 17, 2019, 7:00 AM CDT
Expired: Jun 17, 2019, 8:35 PM CDT
In force: 14 hr
Issued by: NWS St. Louis, MO
Flood severity: None

All 26 counties

Bond County, IL, Clinton County, IL, Fayette County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Randolph County, IL, Saint Clair County, IL, Washington County, IL, City of Saint Louis, MO, Cole County, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Iron County, MO, Jefferson County, MO, Madison County, MO, Moniteau County, MO, Osage County, MO, Reynolds County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Warren County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 43 km from the middle of the area, began a volume at 08:18 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, 8.3 hours before the alert went out and 261 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: -64 J/kg
Mixed-layer LCL: 1260 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 14 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 flash flood watch 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 flash flood watch went out at Jun 16, 3:52 PM CDT, 11 hours 24 minutes earlier.

Area forecast discussion, Jun 16, 3:52 PM CDT, 11 hours 24 minutes before

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Hazardous weather outlook, Jun 16, 3:58 PM CDT, 11 hours 18 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 17, 1:55 PM CDT	Areal Flood Advisory	LSX	Cole, Moniteau, Osage	3 hr
Jun 17, 1:56 PM CDT	Areal Flood Advisory	LSX	Clinton	3 hr

Nearby

Flash Flood Watches in Missouri, 2019 Flash Flood Watches in Illinois, 2019 Every flash flood watch in 2019

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.