Alert archive / Illinois / Flash Flood Warnings in 2018
Flash Flood Warning 30, NWS St. Louis, MO
NWS St. Louis, MO issued this flash flood warning at Aug 17, 2018, 1:19 AM CDT for Montgomery County, Illinois. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 17, 2018, 1:19 AM CDT (06:19 UTC)
- Expired
- Aug 17, 2018, 7:15 AM CDT
- In force
- 6 hr
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Flood severity
- None
County Montgomery County, IL
The radar
The Lincoln radar (KILX), 103 km from the middle of the area, began a volume at 06:22 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.
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 6.3 hours before the alert went out and 121 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
- 2444 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 939 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 74 m²/s²
- 0-3 km storm-relative helicity
- 99 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 3.1
The text
As transmitted.
376
WGUS53 KLSX 170619
FFWLSX
ILC135-171215-
/O.NEW.KLSX.FF.W.0030.180817T0619Z-180817T1215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
119 AM CDT FRI AUG 17 2018
The National Weather Service in St Louis has issued a
* Flash Flood Warning for...
Montgomery County in south central Illinois...
* Until 715 AM CDT.
* At 119 AM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Two to three inches of rain
has already fallen. Flash flooding is expected to begin shortly.
* Some locations that will experience flooding include...
Litchfield, Hillsboro, Nokomis, Witt, Taylor Springs, Schram City,
Irving, Coalton, Butler, Ohlman, Walshville, Wenonah and Honey
Bend.
This includes Interstate 55 in Illinois between exits 52 and 60.
This also includes Lake Lou Yaeger.
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 3922 8925 3914 8925 3904 8970 3928 8970
3935 8931 3935 8914 3922 8914
$$
Tilly2 follow-up statements
195
WGUS73 KLSX 170928
FFSLSX
Flash Flood Statement
National Weather Service St Louis MO
428 AM CDT FRI AUG 17 2018
ILC135-171215-
/O.CON.KLSX.FF.W.0030.000000T0000Z-180817T1215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Montgomery IL-
428 AM CDT FRI AUG 17 2018
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 715 AM CDT FOR
MONTGOMERY COUNTY...
At 425 AM CDT, automated river gauges indicated flooding is
occurring along the East Fork Shoal Creek near Coffeen. Up to three
inches of rain have already fallen across the warned area.
Some locations that will experience flooding include...
Litchfield, Hillsboro, Nokomis, Witt, Taylor Springs, Schram City,
Irving, Coalton, Butler, Ohlman, Walshville, Wenonah and Honey Bend.
This includes Interstate 55 in Illinois between exits 52 and 60.
This also includes Lake Lou Yaeger.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 3922 8925 3914 8925 3904 8970 3928 8970
3935 8931 3935 8914 3922 8914
$$
Tilly836
WGUS73 KLSX 171214
FFSLSX
Flash Flood Statement
National Weather Service St Louis MO
714 AM CDT FRI AUG 17 2018
ILC135-171223-
/O.EXP.KLSX.FF.W.0030.000000T0000Z-180817T1215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Montgomery IL-
714 AM CDT FRI AUG 17 2018
...THE FLASH FLOOD WARNING FOR MONTGOMERY COUNTY WILL EXPIRE AT 715
AM 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 3922 8925 3914 8925 3904 8970 3928 8970
3935 8931 3935 8914 3922 8914
$$
GKSThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 16, 10:41 PM CDT | Special Weather Statement | LSX | Greene | 34 min |
| Aug 17, 12:36 AM CDT | Special Weather Statement | LSX | Montgomery | 39 min |
| Aug 17, 1:55 AM CDT | Severe Thunderstorm Warning | LSX | Bond, Fayette, Montgomery | 35 min |
| Aug 17, 2:31 AM CDT | Flash Flood Warning | LSX | Fayette | 5 hr |
| Aug 17, 2:50 AM CDT | Special Weather Statement | LSX | Marion | 40 min |
Nearby
Flash Flood Warnings in Illinois, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.