Alert archive / Illinois / Flash Flood Warnings in 2018
Flash Flood Warning 42, NWS St. Louis, MO
NWS St. Louis, MO issued this flash flood warning at Sep 7, 2018, 8:34 PM CDT for Monroe County, Randolph County, Saint Clair County, Illinois; Jefferson County, Sainte Genevieve County, Missouri. It was in force for 5 hr. 2 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
- Sep 7, 2018, 8:34 PM CDT (01:34 UTC)
- Expired
- Sep 8, 2018, 1:40 AM CDT
- In force
- 5 hr
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Flood severity
- None
Counties Monroe County, IL, Randolph County, IL, Saint Clair County, IL, Jefferson County, MO, Sainte Genevieve County, MO
The radar
The St Louis radar (KLSX), 77 km from the middle of the area, began a volume at 01:36 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 |
|---|---|---|---|
| Sep 7, 9:10 PM CDT | FLASH FLOOD | Hecker, IL | WATER OVER HIGHWAY 159 AND 156. |
| Sep 7, 9:10 PM CDT | FLASH FLOOD | Smithton, IL | FLOODING ALONG HIGHWAY 159 THROUGH SMITHTON. |
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, 1.6 hours before the alert went out and 244 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
- 32 J/kg
- Mixed-layer CIN
- -22 J/kg
- Mixed-layer LCL
- 547 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- -26 m²/s²
- 0-3 km storm-relative helicity
- -43 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
588
WGUS53 KLSX 080134
FFWLSX
ILC133-157-163-MOC099-186-080730-
/O.NEW.KLSX.FF.W.0042.180908T0134Z-180908T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
834 PM CDT FRI SEP 7 2018
The National Weather Service in St Louis has issued a
* Flash Flood Warning for...
Monroe County in southwestern Illinois...
Northern Randolph County in southwestern Illinois...
Southern St. Clair County in southwestern Illinois...
Eastern Jefferson County in east central Missouri...
Northern Ste. Genevieve County in southeastern Missouri...
* Until 230 AM CDT.
* At 831 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Up to three inches of rain have
already fallen between Harrisonville and Prairie Du Rocher in the
past three hours. Flash flooding is expected to begin shortly.
* Some locations that will experience flooding include...
Arnold, Waterloo, Pevely, Crystal City, Ste. Genevieve, Freeburg,
Sparta, Red Bud, Herculaneum, Barnhart, Smithton, Steeleville, New
Athens, Marissa, Valmeyer, Tilden, Evansville, Bloomsdale, Baldwin
and Fountain.
This includes Interstate 55 in Missouri between exits 157 and 170,
and near exit 187.
This also includes Mastodon Historic Site and Gov. Dunklin's Grave
Historic Site.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 3801 8966 3799 9034 3841 9040 3841 9035
3839 9034 3841 9031 3844 8971 3822 8970
3822 8968
$$
GKS1 follow-up statement
055
WGUS73 KLSX 080640
FFSLSX
Flash Flood Statement
National Weather Service St Louis MO
140 AM CDT SAT SEP 8 2018
ILC133-157-163-MOC099-186-080650-
/O.CAN.KLSX.FF.W.0042.000000T0000Z-180908T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Monroe IL-Randolph IL-St. Clair IL-Jefferson MO-Ste. Genevieve MO-
140 AM CDT SAT SEP 8 2018
...THE FLASH FLOOD WARNING FOR MONROE...NORTHERN RANDOLPH...SOUTHERN
ST. CLAIR...EASTERN JEFFERSON AND NORTHERN STE. GENEVIEVE COUNTIES IS
CANCELLED...
Rain will continue to fall over the area tonight with additional
flooding possible. Therefore, the flash flood warning has be
replaced by an areal flood warning. Please continue to heed any
remaining road closures and report flooding to local authorities.
LAT...LON 3801 8966 3799 9034 3841 9040 3841 9035
3839 9034 3841 9031 3844 8971 3822 8970
3822 8968
$$
MaplesThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 7, 7:26 PM CDT | Flash Flood Warning | LSX | Saint Clair | 6 hr |
| Sep 8, 1:31 AM CDT | Areal Flood Warning | LSX | Monroe, Randolph, Saint Clair | 12 hr |
| Sep 8, 8:44 AM CDT | Areal Flood Warning | LSX | Monroe, Saint Clair | 6 hr |
| Sep 8, 9:06 AM CDT | Areal Flood Warning | LSX | Bond, Clinton, Fayette, Madison, Marion, Randolph and 1 more | 9 hr |
| Sep 8, 1:28 PM CDT | Areal Flood Warning | LSX | Monroe, Randolph, Saint Clair | 6 hr |
| Sep 8, 5:58 PM CDT | Areal Flood Warning | LSX | Clinton, Fayette, Madison, Marion, Washington | 12 hr |
| Sep 7, 7:28 PM CDT | River Flood Warning | LSX | Marion | 17 hr |
| Sep 7, 8:02 PM CDT | Flash Flood Warning | LSX | Franklin, Jefferson, Washington | 6 hr |
| Sep 7, 9:27 PM CDT | Areal Flood Advisory | LSX | Saint Charles, Saint Louis, City of Saint Louis | 4 hr |
| Sep 8, 2:56 AM CDT | Flash Flood Warning | LSX | Crawford | 6 hr |
| Sep 8, 8:59 AM CDT | Areal Flood Warning | LSX | Crawford | 6 hr |
Nearby
Flash Flood Warnings in Illinois, 2018Flash Flood Warnings in Missouri, 2018Every flash flood warning in 2018
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.