Alert archive / Missouri / Flash Flood Warnings in 2020
Flash Flood Warning 49, NWS St. Louis, MO
NWS St. Louis, MO issued this flash flood warning at Jul 31, 2020, 1:19 PM CDT for Franklin County, Gasconade County, Warren County, Missouri. It was in force for 6 hr. 6 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, 1:19 PM CDT (18:19 UTC)
- Expired
- Jul 31, 2020, 7:15 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, Warren County, MO
The radar
The St Louis radar (KLSX), 47 km from the middle of the area, began a volume at 18:18 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 31, 1:30 PM CDT | FLASH FLOOD | Treloar, MO | SEVERAL ROADS IN AND AROUND TOWN WERE FLOODED. ALSO, SEVERAL BASEMENTS IN TOWN WERE FLOODED. |
| Jul 31, 1:47 PM CDT | FLOOD | Treloar, MO | HIGHWAY N CLOSED DUE TO HIGH WATER. |
| Jul 31, 2:45 PM CDT | HEAVY RAIN 2.02 | 3 Ese Washington, MO | RAINFALL IN THE PAST 2.5 HOURS. |
| Jul 31, 6:25 PM CDT | HEAVY RAIN 3.02 | 2 Nw Lyon, MO | |
| Jul 31, 6:26 PM CDT | HEAVY RAIN 3.04 | 1 Wnw Washington, MO | |
| Jul 31, 6:27 PM CDT | HEAVY RAIN 3.31 | 1 Se Dutzow, MO |
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 12:00Z, 6.3 hours before the alert went out and 282 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
- 1082 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- 17 m²/s²
- 0-3 km storm-relative helicity
- 44 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
654
WGUS53 KLSX 311819
FFWLSX
MOC071-073-219-010015-
/O.NEW.KLSX.FF.W.0049.200731T1819Z-200801T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
119 PM CDT Fri Jul 31 2020
The National Weather Service in St Louis has issued a
* Flash Flood Warning for...
Northwestern Franklin County in east central Missouri...
Southeastern Warren County in east central Missouri...
Northeastern Gasconade County in east central Missouri...
* Until 715 PM CDT.
* At 117 PM CDT, Doppler radar and automated gauges indicated
showers producing heavy rain across the warned area. Two to four
inches of rain have fallen in the last two to three hours. Flash
flooding is ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by heavy showers.
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...
Washington, New Haven, Marthasville, Dutzow and Lyon.
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 3861 9150 3865 9109 3874 9110 3874 9096
3847 9096 3851 9140
FLASH FLOOD...RADAR AND GAUGE INDICATED
$$
KD3 follow-up statements
190
WGUS73 KLSX 312010
FFSLSX
Flash Flood Statement
National Weather Service St Louis MO
310 PM CDT Fri Jul 31 2020
MOC071-073-219-010015-
/O.CON.KLSX.FF.W.0049.000000T0000Z-200801T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Franklin MO-Warren MO-Gasconade MO-
310 PM CDT Fri Jul 31 2020
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 715 PM CDT FOR
NORTHWESTERN FRANKLIN...SOUTHEASTERN WARREN AND NORTHEASTERN
GASCONADE COUNTIES...
At 309 PM CDT, Doppler radar and automated gauges indicated heavy
showers producing heavy rain across the warned area. Two to as much
as four inches of rain have fallen. Flash flooding is ongoing or
expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar and automated gauges.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other drainage
and low lying areas.
Some locations that will experience flooding include...
Washington, New Haven, Marthasville, Dutzow and Lyon.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, country roads, farmland, and other low lying
spots.
&&
LAT...LON 3861 9150 3865 9109 3874 9110 3874 9096
3847 9096 3851 9140
FLASH FLOOD...RADAR AND GAUGE INDICATED
$$
KD054
WGUS73 KLSX 312215
FFSLSX
Flash Flood Statement
National Weather Service St Louis MO
515 PM CDT Fri Jul 31 2020
MOC071-073-219-010015-
/O.CON.KLSX.FF.W.0049.000000T0000Z-200801T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Franklin MO-Warren MO-Gasconade MO-
515 PM CDT Fri Jul 31 2020
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 715 PM CDT FRIDAY
FOR NORTHWESTERN FRANKLIN...SOUTHEASTERN WARREN AND NORTHEASTERN
GASCONADE COUNTIES...
At 513 PM CDT, Doppler radar and automated gauges indicate that as
much as 3 to 5 inches of rain fell across northwest Franklin County
and northeast Gasconade 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...
Washington, New Haven, Marthasville, Dutzow and Lyon.
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 3861 9150 3865 9109 3874 9110 3874 9096
3847 9096 3851 9140
FLASH FLOOD...RADAR AND GAUGE INDICATED
$$
Glass414
WGUS73 KLSX 010011
FFSLSX
Flash Flood Statement
National Weather Service St Louis MO
711 PM CDT Fri Jul 31 2020
MOC071-073-219-010021-
/O.EXP.KLSX.FF.W.0049.000000T0000Z-200801T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Franklin MO-Warren MO-Gasconade MO-
711 PM CDT Fri Jul 31 2020
...THE FLASH FLOOD WARNING FOR NORTHWESTERN FRANKLIN...SOUTHEASTERN
WARREN AND NORTHEASTERN GASCONADE COUNTIES WILL EXPIRE AT 715 PM
CDT...
The heavy rain has ended. Flood waters have receded. Flooding is no
longer expected to pose a threat. Please continue to heed any
remaining road closures.
LAT...LON 3861 9150 3865 9109 3874 9110 3874 9096
3847 9096 3851 9140
$$
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, 12:10 PM CDT | Flash Flood Warning | LSX | Franklin, Gasconade, Montgomery, 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.