Alert archive / Illinois / Flash Flood Warnings in 2020
Flash Flood Warning 29, NWS St. Louis, MO
NWS St. Louis, MO issued this flash flood warning at Jun 30, 2020, 4:21 AM CDT for Monroe County, Saint Clair County, Washington County, Illinois; Saint Louis County, Missouri. It was in force for 6 hr. 3 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
- Jun 30, 2020, 4:21 AM CDT (09:21 UTC)
- Expired
- Jun 30, 2020, 10:15 AM CDT
- In force
- 6 hr
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Flood severity
- None
Counties Monroe County, IL, Saint Clair County, IL, Washington County, IL, Saint Louis County, MO
The radar
The St Louis radar (KLSX), 77 km from the middle of the area, began a volume at 09:20 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 |
|---|---|---|---|
| Jun 30, 7:00 AM CDT | HEAVY RAIN 2.59 | Fayetteville, IL | MESONET STATION FYEI2 FAYETTEVILLE. |
| Jun 30, 8:13 AM CDT | HEAVY RAIN 2.6 | Columbia, IL | |
| Jun 30, 8:30 AM CDT | HEAVY RAIN 3.33 | 2 Se Freeburg, IL | MESONET STATION FREI2 2.4 SE FREEBURG. |
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, 9.4 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
- 436 J/kg
- Mixed-layer CIN
- -42 J/kg
- Mixed-layer LCL
- 1789 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 6 m²/s²
- 0-3 km storm-relative helicity
- -17 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
233
WGUS53 KLSX 300921
FFWLSX
ILC133-163-189-MOC189-301515-
/O.NEW.KLSX.FF.W.0029.200630T0921Z-200630T1515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
421 AM CDT Tue Jun 30 2020
The National Weather Service in St Louis has issued a
* Flash Flood Warning for...
Northern Monroe County in southwestern Illinois...
Southwestern Washington County in south central Illinois...
Southern St. Clair County in southwestern Illinois...
South central St. Louis County in east central Missouri...
* Until 1015 AM CDT.
* At 419 AM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the eastern portions of the warned area. 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...
Belleville, Arnold, Columbia, Freeburg, Millstadt, Oakville,
Smithton, New Athens, Marissa, Okawville, Lively Grove, St. Libory,
Lenzburg, Johannisburg, Fayetteville, Barr, Venedy, Floraville, New
Hanover and Paderborn.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 3822 8960 3822 8991 3833 8993 3841 9034
3843 9035 3845 9034 3847 9036 3845 8971
3842 8970 3843 8967 3844 8967 3844 8954
FLASH FLOOD...RADAR INDICATED
$$
Fuchs2 follow-up statements
414
WGUS73 KLSX 301329
FFSLSX
Flash Flood Statement
National Weather Service St Louis MO
829 AM CDT Tue Jun 30 2020
ILC133-163-189-MOC189-301515-
/O.CON.KLSX.FF.W.0029.000000T0000Z-200630T1515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Monroe IL-Washington IL-St. Clair IL-St. Louis MO-
829 AM CDT Tue Jun 30 2020
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1015 AM CDT FOR
NORTHERN MONROE...SOUTHWESTERN WASHINGTON...SOUTHERN ST. CLAIR AND
SOUTH CENTRAL ST. LOUIS COUNTIES...
At 827 AM CDT, Doppler radar indicated another round of
thunderstorms producing heavy rain moving into the warned area. Up
to three inches of rain fell last night and an additional 1 to 2
inches is possible with these morning thunderstorms.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar indicated.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other drainage
and low lying areas.
Some locations that will experience flooding include...
Belleville, Arnold, Columbia, Freeburg, Millstadt, Oakville,
Smithton, New Athens, Marissa, Okawville, Lively Grove, St. Libory,
Lenzburg, Johannisburg, Fayetteville, Barr, Venedy, Floraville, New
Hanover and Paderborn.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If you approach a flooded roadway, it is best to turn around, don't
drown!
&&
LAT...LON 3822 8960 3822 8991 3833 8993 3841 9034
3843 9035 3845 9034 3847 9036 3845 8971
3842 8970 3843 8967 3844 8967 3844 8954
FLASH FLOOD...RADAR INDICATED
$$
CVKING655
WGUS73 KLSX 301506
FFSLSX
Flash Flood Statement
National Weather Service St Louis MO
1006 AM CDT Tue Jun 30 2020
ILC133-163-189-MOC189-301515-
/O.EXP.KLSX.FF.W.0029.000000T0000Z-200630T1515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Monroe IL-Washington IL-St. Clair IL-St. Louis MO-
1006 AM CDT Tue Jun 30 2020
...THE FLASH FLOOD WARNING FOR NORTHERN MONROE...SOUTHWESTERN
WASHINGTON...SOUTHERN ST. CLAIR AND SOUTH CENTRAL ST. LOUIS COUNTIES
WILL EXPIRE AT 1015 AM CDT...
The heavy rain ended early this morning and any flooding that
occurred has likely receeded.
LAT...LON 3822 8960 3822 8991 3833 8993 3841 9034
3843 9035 3845 9034 3847 9036 3845 8971
3842 8970 3843 8967 3844 8967 3844 8954
$$
CVKINGThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 29, 11:14 PM CDT | Areal Flood Warning | LSX | Adams | 3 hr |
| Jun 30, 12:21 AM CDT | Flash Flood Warning | LSX | Adams, Pike | 6 hr |
| Jun 30, 1:34 AM CDT | Flash Flood Warning | LSX | Adams | 6 hr |
| Jun 30, 2:33 AM CDT | Areal Flood Advisory | LSX | Monroe, Saint Clair | 3 hr |
| Jun 30, 3:35 AM CDT | Flash Flood Warning | LSX | Pike | 6 hr |
| Jun 30, 4:33 AM CDT | Flash Flood Warning | LSX | Adams | 6 hr |
| Jun 30, 5:15 AM CDT | Flash Flood Warning | LSX | Washington | 5 hr |
| Jun 30, 6:02 AM CDT | Flash Flood Warning | LSX | Adams | 6 hr |
| Jun 30, 6:13 AM CDT | Areal Flood Warning | LSX | Adams, Pike | 6 hr |
| Jun 30, 10:12 AM CDT | Flash Flood Warning | LSX | Fayette | 6 hr |
| Jun 30, 11:41 AM CDT | River Flood Warning | LSX | Adams | 53 hr |
| Jun 30, 11:41 AM CDT | River Flood Warning | LSX | Adams | 48 hr |
| Jun 30, 11:41 AM CDT | River Flood Warning | LSX | Pike | 66 hr |
| Jun 30, 11:41 AM CDT | River Flood Warning | LSX | Jersey | 6 days |
| Jun 30, 12:59 PM CDT | Areal Flood Advisory | LSX | Madison, Saint Clair | 3 hr |
| Jun 30, 4:49 PM CDT | Flash Flood Warning | LSX | Randolph | 5 hr |
Nearby
Flash Flood Warnings in Illinois, 2020Flash 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.