Alert archive / Missouri / Flash Flood Warnings in 2020
Flash Flood Warning 8, NWS St. Louis, MO
NWS St. Louis, MO issued this flash flood warning at May 17, 2020, 2:02 AM CDT for Saint Charles County, Saint Louis County, Missouri; Jersey County, Madison County, Illinois. It was in force for 5 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- May 17, 2020, 2:02 AM CDT (07:02 UTC)
- Expired
- May 17, 2020, 7:00 AM CDT
- In force
- 5 hr
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Flood severity
- None
Counties Jersey County, IL, Madison County, IL, Saint Charles County, MO, Saint Louis County, MO
The radar
The St Louis radar (KLSX), 39 km from the middle of the area, began a volume at 07:04 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
Davenport, (KDVN), launched 00:00Z, 7.0 hours before the alert went out and 308 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1150 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 136 m²/s²
- 0-3 km storm-relative helicity
- 285 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
677
WGUS53 KLSX 170702
FFWLSX
ILC083-119-MOC183-189-171200-
/O.NEW.KLSX.FF.W.0008.200517T0702Z-200517T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
202 AM CDT Sun May 17 2020
The National Weather Service in St Louis has issued a
* Flash Flood Warning for...
Northwestern Madison County in southwestern Illinois...
Southeastern Jersey County in southwestern Illinois...
Northeastern St. Charles County in east central Missouri...
Northern St. Louis County in east central Missouri...
* Until 700 AM CDT.
* At 200 AM CDT, Doppler radar indicated showers and thunderstorms
producing heavy rain across the warned area. Up to two inches of
rain have already fallen. Flash flooding is ongoing or expected to
begin shortly.
HAZARD...Flash flooding caused by showers and thunderstorms.
SOURCE...Radar indicated.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other
drainage and low lying areas.
* Some locations that will experience flooding include...
St. Louis, St. Charles, St. Peters, Florissant, Chesterfield,
Granite City, Alton, Maryland Heights, Hazelwood, Edwardsville,
Ferguson, Godfrey, Creve Coeur, Overland, Jennings, St. Ann,
Bridgeton, Bellefontaine Neighbors, Town and Country and Wood
River.
This also includes Confluence State Park and First Missouri State
Capitol Historic Site.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, urban areas, highways, streets and underpasses as
well as other drainage areas and low lying spots.
&&
LAT...LON 3872 9021 3877 9017 3877 9018 3874 9020
3871 9025 3863 9062 3889 9053 3897 9045
3896 9050 3908 9046 3916 9015 3900 9015
3900 9010 3877 9001
FLASH FLOOD...RADAR INDICATED
$$
GKS1 follow-up statement
222
WGUS73 KLSX 171201
FFSLSX
Flash Flood Statement
National Weather Service St Louis MO
701 AM CDT Sun May 17 2020
ILC083-119-MOC183-189-171211-
/O.EXP.KLSX.FF.W.0008.000000T0000Z-200517T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Madison IL-Jersey IL-St. Charles MO-St. Louis MO-
701 AM CDT Sun May 17 2020
...THE FLASH FLOOD WARNING FOR NORTHWESTERN MADISON AND SOUTHEASTERN
JERSEY COUNTIES IN SOUTHWESTERN ILLINOIS...NORTHEASTERN ST. CHARLES
AND NORTHERN ST. LOUIS COUNTIES IN EAST CENTRAL MISSOURI HAS
EXPIRED...
The heavy rain has ended. Flood waters have receded. Flooding is no
longer expected to pose a threat. Please continue to heed any
remaining road closures.
LAT...LON 3872 9021 3877 9017 3877 9018 3874 9020
3871 9025 3863 9062 3889 9053 3897 9045
3896 9050 3908 9046 3916 9015 3900 9015
3900 9010 3877 9001
$$
GKSThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 16, 7:50 PM CDT | Areal Flood Advisory | LSX | Jefferson, Saint Louis | 3 hr |
| May 16, 8:32 PM CDT | River Flood Warning | LSX | Gasconade, Montgomery | 3 days |
| May 16, 8:58 PM CDT | Flash Flood Watch | LSX | Crawford, Franklin, Iron, Jefferson, Lincoln, Madison and 8 more | 21 hr |
| May 16, 9:14 PM CDT | River Flood Warning | LSX | Saint Charles | 5 days |
| May 16, 9:14 PM CDT | River Flood Warning | LSX | Perry, Sainte Genevieve | 32 days |
| May 16, 9:19 PM CDT | River Flood Warning | LSX | Jefferson, Saint Louis | 7 days |
| May 17, 1:36 AM CDT | Areal Flood Advisory | LSX | Franklin, Lincoln, Saint Charles, Saint Louis, City of Saint Louis | 6 hr |
| May 17, 4:39 AM CDT | Areal Flood Advisory | LSX | Sainte Genevieve, Saint Francois | 6 hr |
| May 17, 8:45 AM CDT | River Flood Warning | LSX | Pike | 51 hr |
| May 17, 9:51 AM CDT | River Flood Warning | LSX | Gasconade, Montgomery | 49 hr |
| May 17, 10:35 AM CDT | River Flood Warning | LSX | Crawford, Washington | 48 hr |
| May 17, 2:15 PM CDT | River Flood Warning | LSX | Reynolds | 29 hr |
| May 17, 3:32 AM CDT | Areal Flood Advisory | LSX | Calhoun, Greene, Jersey, Macoupin | 12 hr |
| May 17, 11:31 AM CDT | River Flood Warning | LSX | Brown | 33 hr |
| May 17, 12:26 PM CDT | River Flood Warning | LSX | Fayette | 4 days |
| May 17, 3:29 PM CDT | Areal Flood Advisory | LSX | Calhoun, Greene, Jersey, Macoupin | 6 hr |
Nearby
Flash Flood Warnings in Missouri, 2020Flash Flood Warnings in Illinois, 2020Every flash flood warning in 2020
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.