Alert archive / Missouri / Flash Flood Warnings in 2020
Flash Flood Warning 48, NWS St. Louis, MO
NWS St. Louis, MO issued this flash flood warning at Jul 31, 2020, 12:10 PM CDT for 4 counties in Missouri. It was in force for 6 hr. 13 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
- Jul 31, 2020, 12:10 PM CDT (17:10 UTC)
- Expired
- Jul 31, 2020, 6:15 PM CDT
- In force
- 6 hr
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Flood severity
- None
Counties Franklin County, MO, Gasconade County, MO, Montgomery County, MO, Warren County, MO
The radar
The St Louis radar (KLSX), 71 km from the middle of the area, began a volume at 17:11 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 |
|---|---|---|---|
| Jul 31, 12:15 PM CDT | FLOOD | Hermann, MO | HIGHWAY 19 IN HERMANN, MO CLOSED DUE TO FLOODING. |
| Jul 31, 12:30 PM CDT | FLASH FLOOD | 3 Sw Hermann, MO | FACEBOOK VIDEO SHOWS FLASH FLOODING OF FRENE CREEK NEAR THE ADAM PUTCHA WINERY. |
| Jul 31, 1:02 PM CDT | FLOOD | Hermann, MO | MULTIPLE ROADS NOW FLOODED IN AND JUST OUTSIDE OF TOWN. |
| Jul 31, 1:30 PM CDT | FLOOD | Rhineland, MO | HIGHWAY 94 CLOSED DUE TO FLOODING. |
| Jul 31, 1:40 PM CDT | FLOOD | Hermann, MO | DELAYED REPORT: WATER OVER ROAD IN DOWNTOWN HERMANN FROM FRENE CREEK OVERFLOWING ITS BANKS. |
| Jul 31, 1:56 PM CDT | FLOOD | 2 E Holstein, MO | FLOODING CLOSED A ROADWAY IN CONCORD HILL. |
| Jul 31, 2:18 PM CDT | FLOOD | Berger, MO | DIEDERICH ROAD CLOSED DUE TO FLOODING SOUTHEAST OF BERGER. |
| Jul 31, 5:21 PM CDT | HEAVY RAIN 7.1 | 1 Ssw Hermann, MO | |
| Jul 31, 5:23 PM CDT | HEAVY RAIN 6.11 | Hermann, MO | |
| Jul 31, 5:27 PM CDT | HEAVY RAIN 6.7 | 4 Ene Berger, MO | |
| Jul 31, 6:00 PM CDT | FLOOD | Berger, MO | ROUTE B FROM BERGER TO ETLAH WAS CLOSED DUE TO FLOODING FROM THE HEAVY RAIN EARLIER TODAY. |
| Jul 31, 6:23 PM CDT | HEAVY RAIN 3.29 | 2 Nw Rhineland, MO | |
| Jul 31, 6:24 PM CDT | HEAVY RAIN 3.91 | 3 Ssw Berger, MO |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Springfield, MO (KSGF), launched 12:00Z, 5.2 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.
- Mixed-layer CAPE
- 590 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 484 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 10 m²/s²
- 0-3 km storm-relative helicity
- 25 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
322
WGUS53 KLSX 311710
FFWLSX
MOC071-073-139-219-312315-
/O.NEW.KLSX.FF.W.0048.200731T1710Z-200731T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
1210 PM CDT Fri Jul 31 2020
The National Weather Service in St Louis has issued a
* Flash Flood Warning for...
Southwestern Montgomery County in east central Missouri...
Northwestern Franklin County in east central Missouri...
Central Warren County in east central Missouri...
Northeastern Gasconade County in east central Missouri...
* Until 615 PM CDT Friday.
* At 1208 PM CDT, Doppler radar indicated showers producing heavy
rain across the warned area. Two to four inches of rain has fallen
in the last few hours. Flash flooding is ongoing or expected to
begin shortly.
HAZARD...Flash flooding caused by heavy showers.
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...
Warrenton, Hermann, Truesdale, Big Spring, Treloar, Gasconade,
Berger, Rhineland, McKittrick, Americus and Holstein.
This also includes Deutschheim Historic Site.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3882 9164 3883 9112 3865 9109 3861 9152
3871 9147 3869 9151 3867 9157 3869 9161
3870 9164 3872 9165
FLASH FLOOD...RADAR INDICATED
$$
KD3 follow-up statements
132
WGUS73 KLSX 311804
FFSLSX
Flash Flood Statement
National Weather Service St Louis MO
104 PM CDT Fri Jul 31 2020
MOC071-073-139-219-312315-
/O.CON.KLSX.FF.W.0048.000000T0000Z-200731T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Montgomery MO-Franklin MO-Warren MO-Gasconade MO-
104 PM CDT Fri Jul 31 2020
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 615 PM CDT FRIDAY
FOR SOUTHWESTERN MONTGOMERY...NORTHWESTERN FRANKLIN...CENTRAL WARREN
AND NORTHEASTERN GASCONADE COUNTIES...
At 103 PM CDT, law enforcement reported flash flooding in the town
of Hermann, Missouri. Two to four inches of rain have already
fallen, with additional rainfall continuing. Flash flooding is
ongoing.
HAZARD...Flash flooding caused by heavy showers.
SOURCE...Law enforcement.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other drainage
and low lying areas.
Some locations that will experience flooding include...
Warrenton, Hermann, Truesdale, Big Spring, Treloar, Gasconade,
Berger, Rhineland, McKittrick, Americus and Holstein.
This also includes Deutschheim Historic Site.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, country roads, farmland, and other low lying
spots.
&&
LAT...LON 3882 9164 3883 9112 3865 9109 3861 9152
3871 9147 3869 9151 3867 9157 3869 9161
3870 9164 3872 9165
FLASH FLOOD...OBSERVED
$$
KD987
WGUS73 KLSX 312211
FFSLSX
Flash Flood Statement
National Weather Service St Louis MO
511 PM CDT Fri Jul 31 2020
MOC071-073-139-219-312315-
/O.CON.KLSX.FF.W.0048.000000T0000Z-200731T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Montgomery MO-Franklin MO-Warren MO-Gasconade MO-
511 PM CDT Fri Jul 31 2020
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 615 PM CDT FRIDAY
FOR SOUTHWESTERN MONTGOMERY...NORTHWESTERN FRANKLIN...CENTRAL WARREN
AND NORTHEASTERN GASCONADE COUNTIES...
At 509 PM CDT, Doppler radar and automated gauges indicate that as
much as 3 to 7 inches of rain fell across southern Warren and
southern Montgomery County earlier today. Flooding has been reported
on some roads in the warned area.
HAZARD...Flash flooding caused by heavy rain.
SOURCE...Radar and automated gauges.
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...
Warrenton, Hermann, Truesdale, Big Spring, Treloar, Gasconade,
Berger, Rhineland, McKittrick, Americus and Holstein.
This also includes Deutschheim 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, country roads, farmland, and other low lying
spots.
&&
LAT...LON 3882 9164 3883 9112 3865 9109 3861 9152
3871 9147 3869 9151 3867 9157 3869 9161
3870 9164 3872 9165
FLASH FLOOD...RADAR AND GAUGE INDICATED
$$
Glass815
WGUS73 KLSX 312313
FFSLSX
Flash Flood Statement
National Weather Service St Louis MO
613 PM CDT Fri Jul 31 2020
MOC071-073-139-219-312322-
/O.EXP.KLSX.FF.W.0048.000000T0000Z-200731T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Montgomery MO-Franklin MO-Warren MO-Gasconade MO-
613 PM CDT Fri Jul 31 2020
...THE FLASH FLOOD WARNING FOR SOUTHWESTERN MONTGOMERY...NORTHWESTERN
FRANKLIN...CENTRAL WARREN AND NORTHEASTERN GASCONADE COUNTIES WILL
EXPIRE AT 615 PM CDT FRIDAY...
The heavy rain has ended. Flood waters have receded. Flooding is no
longer expected to pose a threat. Please continue to heed any
remaining road closures.
LAT...LON 3882 9164 3883 9112 3865 9109 3861 9152
3871 9147 3869 9151 3867 9157 3869 9161
3870 9164 3872 9165
$$
GlassThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 8:52 PM CDT | Flash Flood Warning | LSX | Cole, Osage | 4 hr |
| Jul 31, 3:25 AM CDT | Flash Flood Watch | LSX | Crawford, Franklin, Iron, Jefferson, Lincoln, Madison and 8 more | 21 hr |
| Jul 31, 7:28 AM CDT | Areal Flood Advisory | LSX | Boone, Callaway, Cole, Gasconade, Moniteau, Montgomery and 1 more | 3 hr |
| Jul 31, 8:33 AM CDT | Flash Flood Warning | LSX | Gasconade | 6 hr |
| Jul 31, 11:31 AM CDT | Areal Flood Advisory | LSX | Franklin, Gasconade, Montgomery, Warren | 3 hr |
| Jul 31, 1:19 PM CDT | Flash Flood Warning | LSX | Franklin, Gasconade, Warren | 6 hr |
| Jul 31, 4:18 PM CDT | Flash Flood Warning | LSX | Iron, Reynolds | 5 hr |
| Jul 31, 4:29 PM CDT | Areal Flood Advisory | LSX | Saint Charles | 3 hr |
Nearby
Flash Flood Warnings in Missouri, 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.