Alert archive / Missouri / Flash Flood Warnings in 2020
Flash Flood Warning 53, NWS St. Louis, MO
NWS St. Louis, MO issued this flash flood warning at Aug 9, 2020, 12:01 AM CDT for Saint Charles County, Missouri; Calhoun County, Illinois. It was in force for 6 hr. 12 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 9, 2020, 12:01 AM CDT (05:01 UTC)
- Expired
- Aug 9, 2020, 6:00 AM CDT
- In force
- 6 hr
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Flood severity
- None
Counties Calhoun County, IL, Saint Charles County, MO
The radar
The St Louis radar (KLSX), 17 km from the middle of the area, began a volume at 05:00 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 9, 12:03 AM CDT | FLASH FLOOD | 2 Nne Saint Paul, MO | HIGHWAY 79 AT VOMUND ROAD IS CLOSED DUE TO ABOUT A FOOT OF WATER OVER THE HIGHWAY. |
| Aug 9, 12:11 AM CDT | FLASH FLOOD | 2 N Saint Paul, MO | VEHICLE IN FLOOD WATER AT HIGHWAY Y AND VOMUND RD. OCCUPANT ON TOP OF VEHICLE. |
| Aug 9, 12:15 AM CDT | FLASH FLOOD | O'Fallon, MO | VEHICLE IN FLOOD WATER ON MEXICO RD. BETWEEN COLLIER BLVD. AND WINTER HAVEN DR. |
| Aug 9, 12:20 AM CDT | FLASH FLOOD | 1 Nw Dardenne Prairie, MO | VEHICLE IN FLOOD WATER AT WINGHAVEN BLVD. AND HIGHWAY N. WATER UP TO DOORS OF VEHICLE. |
| Aug 9, 1:00 AM CDT | FLASH FLOOD | 2 Ene O'Fallon, MO | VIA TWITTER WITH PICTURE. BELLEAU CREEK OUT OF BANKS AND OVER BELLEAU CREEK ROAD JUST SOUTH OF INTERSECTION WITH VETERANS MEMORIAL PARKWAY. TWO CARS STUCK IN FLOOD WATERS THERE. |
| Aug 9, 1:00 AM CDT | FLASH FLOOD | 3 Ene Saint Charles, MO | FLOODING OF APARTMENT COMPLEX NEAR RIVERVIEW LANE AND HIGHWAY 94. WATER SEVERAL FEET DEEP STRANDED CARS AND RESULTED IN EVACUATION OF 12 UNITS. TIME ESTIMATED. |
| Aug 9, 1:00 AM CDT | FLASH FLOOD | 3 Ene Saint Charles, MO | ROAD FLOODED NEAR RIVERVIEW LANE AND HIGHWAY 94. SEVERAL CARS STUCK IN FLOOD WATERS. |
| Aug 9, 1:17 AM CDT | FLOOD | 2 Ese Dardenne Prairie, MO | CORRECTS PREVIOUS FLOOD REPORT FROM 2 ESE DARDENNE PRAIRIE. THE SMALL STREAM GAUGE ON DARDENNE CREEK AT DCWM7 ROSE ABOVE FLOOD STAGE (14 FEET) AT 117 AM AND PEAKED AT 16.06 FEET AT 240 AM. |
| Aug 9, 1:30 AM CDT | HEAVY RAIN 3.89 | 1 Sse Saint Paul, MO | RAINFALL SO FAR. |
| Aug 9, 3:00 AM CDT | FLOOD | 2 Nw Saint Peters, MO | FLOODING OF SPORTS CENTER PARK IN ST. PETERS DUE TO FLOODING OF DARDENNE CREEK. TIME ESTIMATED. |
| Aug 9, 4:00 AM CDT | HEAVY RAIN 3.3 | 2 Ese Dardenne Prairie, MO | STORM TOTAL RAINFALL AT DCWM7 RIVER GAGE ON DARDENNE CREEK. |
| Aug 9, 6:00 AM CDT | HEAVY RAIN 3.97 | 2 Wsw Weldon Spring, MO | 24 HOUR RAINFALL TOTAL, MOST OF IT FELL AFTER MIDNIGHT. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 5.0 hours before the alert went out and 227 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
- 1146 J/kg
- Mixed-layer CIN
- -15 J/kg
- Mixed-layer LCL
- 1029 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 31 m²/s²
- 0-3 km storm-relative helicity
- 25 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
776
WGUS53 KLSX 090501
FFWLSX
ILC013-MOC183-091100-
/O.NEW.KLSX.FF.W.0053.200809T0501Z-200809T1100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
1201 AM CDT Sun Aug 9 2020
The National Weather Service in St Louis has issued a
* Flash Flood Warning for...
Southeastern Calhoun County in southwestern Illinois...
Western St. Charles County in east central Missouri...
* Until 600 AM CDT.
* At 1200 AM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Up to 4 inches of rain have
fallen so far. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Flash flooding caused by 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...
O'Fallon, St. Charles, St. Peters, Chesterfield, Wentzville,
Hazelwood, Lake St. Louis, Dardenne Prairie, Weldon Spring,
Cottleville, St. Paul, Josephville, Weldon Spring Heights,
Harvester, Orchard Farms, Flint Hill, Brussels, Deer Plain,
Kampville and Golden Eagle.
This also includes First Missouri State Capitol Historic Site.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 3891 9045 3883 9043 3880 9047 3876 9049
3873 9053 3869 9054 3868 9063 3869 9066
3862 9076 3889 9096 3887 9082 3892 9079
3893 9073 3891 9072 3892 9071 3892 9069
3893 9070 3893 9067 3895 9067 3897 9055
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR
$$
Byrd2 follow-up statements
048
WGUS73 KLSX 090903
FFSLSX
Flash Flood Statement
National Weather Service St Louis MO
403 AM CDT Sun Aug 9 2020
ILC013-MOC183-091100-
/O.CON.KLSX.FF.W.0053.000000T0000Z-200809T1100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Calhoun IL-St. Charles MO-
403 AM CDT Sun Aug 9 2020
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 600 AM CDT FOR
SOUTHEASTERN CALHOUN AND WESTERN ST. CHARLES COUNTIES...
At 401 AM CDT, trained weather spotters reported flash flooding in
numerous locations including Belleau Creek just south of Veterans
Memorial Parkway and Interstate 70 in O'Fallon. Up to 6 inches of
rain have fallen. Flash flooding is already occurring. Even though
the rain has tapered off flash flooding will continue.
HAZARD...Flash flooding caused by heavy rain.
SOURCE...Trained weather spotters.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other drainage
and low lying areas.
Some locations that will experience flooding include...
O'Fallon, St. Charles, St. Peters, Chesterfield, Wentzville,
Hazelwood, Lake St. Louis, Dardenne Prairie, Weldon Spring,
Cottleville, St. Paul, Josephville, Weldon Spring Heights, Harvester,
Orchard Farms, Flint Hill, Brussels, Deer Plain, Kampville and Golden
Eagle.
This also includes First Missouri State Capitol Historic Site.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, urban areas, highways, streets and underpasses as
well as other drainage areas and low lying spots.
&&
LAT...LON 3891 9045 3883 9043 3880 9047 3876 9049
3873 9053 3869 9054 3868 9063 3869 9066
3862 9076 3889 9096 3887 9082 3892 9079
3893 9073 3891 9072 3892 9071 3892 9069
3893 9070 3893 9067 3895 9067 3897 9055
FLASH FLOOD...OBSERVED
$$
Byrd434
WGUS73 KLSX 091100
FFSLSX
Flash Flood Statement
National Weather Service St Louis MO
600 AM CDT Sun Aug 9 2020
ILC013-MOC183-091110-
/O.EXP.KLSX.FF.W.0053.000000T0000Z-200809T1100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Calhoun IL-St. Charles MO-
600 AM CDT Sun Aug 9 2020
...THE FLASH FLOOD WARNING FOR SOUTHEASTERN CALHOUN AND WESTERN ST.
CHARLES COUNTIES HAS EXPIRED...
Flood waters have receded. Flooding is no longer expected to pose a
threat. Please continue to heed any remaining road closures.
LAT...LON 3891 9045 3883 9043 3880 9047 3876 9049
3873 9053 3869 9054 3868 9063 3869 9066
3862 9076 3889 9096 3887 9082 3892 9079
3893 9073 3891 9072 3892 9071 3892 9069
3893 9070 3893 9067 3895 9067 3897 9055
$$
ByrdThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 8, 10:50 PM CDT | Areal Flood Advisory | LSX | Lincoln, Pike | 6 hr |
| Aug 8, 11:03 PM CDT | Flash Flood Warning | LSX | Lincoln, Pike | 6 hr |
| Aug 9, 12:56 AM CDT | Areal Flood Advisory | LSX | Saint Louis | 3 hr |
| Aug 9, 1:15 AM CDT | River Flood Warning | LSX | Saint Charles | 22 hr |
| Aug 9, 1:25 AM CDT | Flash Flood Warning | LSX | Saint Louis | 6 hr |
| Aug 9, 2:27 AM CDT | Areal Flood Advisory | LSX | Saint Charles, Warren | 4 hr |
| Aug 9, 2:41 AM CDT | Flash Flood Warning | LSX | Jefferson, Saint Louis, City of Saint Louis | 6 hr |
| Aug 9, 3:54 AM CDT | Areal Flood Advisory | LSX | Franklin, Gasconade | 4 hr |
| Aug 9, 7:29 AM CDT | Areal Flood Warning | LSX | Saint Louis | 3 hr |
| Aug 9, 1:54 PM CDT | Heat Advisory | LSX | Franklin, Iron, Jefferson, Lincoln, Madison, Reynolds and 7 more | 29 hr |
| Aug 9, 9:55 AM CDT | Areal Flood Advisory | LSX | Madison, Saint Clair | 3 hr |
| Aug 9, 10:06 AM CDT | Flash Flood Warning | LSX | Madison | 4 hr |
| Aug 9, 10:23 AM CDT | Flash Flood Warning | LSX | Saint Clair | 4 hr |
| Aug 9, 2:07 PM CDT | Areal Flood Warning | LSX | Saint Clair | 3 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.