Alert archive / Illinois / Flash Flood Warnings in 2026
Flash Flood Warning 13, NWS St. Louis, MO
NWS St. Louis, MO issued this flash flood warning at Apr 27, 2026, 6:47 PM CDT for Macoupin County, Illinois. It was in force for 5 hr. 1 report 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
- Apr 27, 2026, 6:47 PM CDT (23:47 UTC)
- Expired
- Apr 27, 2026, 11:45 PM CDT
- In force
- 5 hr
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Flood severity
- None
County Macoupin County, IL
The radar
The St Louis radar (KLSX), 90 km from the middle of the area, began a volume at 23:49 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 |
|---|---|---|---|
| Apr 27, 11:00 PM CDT | RAIN 4.4 | Staunton, IL | Via social media--daily total. |
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, 11.8 hours before the alert went out and 152 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
- 1053 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 104 m²/s²
- 0-3 km storm-relative helicity
- 306 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
675
WGUS53 KLSX 272347
FFWLSX
ILC117-280445-
/O.NEW.KLSX.FF.W.0013.260427T2347Z-260428T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
647 PM CDT Mon Apr 27 2026
The National Weather Service in St Louis has issued a
* Flash Flood Warning for...
Macoupin County in southwestern Illinois...
* Until 1145 PM CDT.
* At 647 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 2 and 3 inches of rain
have fallen. Additional rainfall amounts of 1 to 3 inches are
possible in the warned area. Flash flooding is ongoing or expected
to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar indicated.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
* Some locations that will experience flash flooding include...
Carlinville, Staunton, Virden, Gillespie, Brighton, Girard, Mount
Olive, Bunker Hill, Benld, Palmyra, Shipman, Wilsonville,
Sawyerville, Mount Clare, East Gillespie, Eagarville, Piasa,
Medora, Nilwood and White City.
This includes the following State Parks...
Beaver Dam State Park.
This includes Interstate 55 in Illinois between exits 41 and 44.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3900 8970 3900 9015 3952 9015 3952 8970
FLASH FLOOD...RADAR INDICATED
$$
Carney2 follow-up statements
139
WGUS73 KLSX 280228
FFSLSX
Flash Flood Statement
National Weather Service St Louis MO
928 PM CDT Mon Apr 27 2026
ILC117-280445-
/O.CON.KLSX.FF.W.0013.000000T0000Z-260428T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Macoupin IL-
928 PM CDT Mon Apr 27 2026
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1145 PM CDT THIS
EVENING FOR MACOUPIN COUNTY...
At 928 PM CDT, Doppler radar indicated that the heavy rain has ended,
however between 3 and 5 inches of rain have fallen in the warning
area. Flash flooding continues to be a threat.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar indicated.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Carlinville, Staunton, Virden, Gillespie, Brighton, Girard, Mount
Olive, Bunker Hill, Benld, Palmyra, Shipman, Wilsonville,
Sawyerville, Mount Clare, East Gillespie, Eagarville, Piasa,
Medora, Nilwood and White City.
This includes the following State Parks...
Beaver Dam State Park.
This includes Interstate 55 in Illinois between exits 41 and 44.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3900 8970 3900 9015 3952 9015 3952 8970
FLASH FLOOD...RADAR INDICATED
$$
Carney787 WGUS73 KLSX 280443 FFSLSX Flash Flood Statement National Weather Service St Louis MO 1143 PM CDT Mon Apr 27 2026 ILC117-280453- /O.EXP.KLSX.FF.W.0013.000000T0000Z-260428T0445Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Macoupin IL- 1143 PM CDT Mon Apr 27 2026 ...FLASH FLOOD WARNING AT 1145 PM CDT THIS EVENING FOR MACOUPIN COUNTY HAS BEEN REPLACED WITH A FLOOD WARNING... && LAT...LON 3900 8970 3900 9015 3952 9015 3952 8970 $$ Pfahler
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 27, 6:32 AM CDT | Severe Thunderstorm Warning | LSX | Clinton, Washington | 43 min |
| Apr 27, 7:03 AM CDT | Severe Thunderstorm Warning | LSX | Clinton, Marion, Washington | 57 min |
| Apr 27, 7:59 AM CDT | Severe Thunderstorm Warning | LSX | Greene, Macoupin, Montgomery | 33 min |
| Apr 27, 8:10 AM CDT | Severe Thunderstorm Warning | LSX | Adams, Calhoun, Pike | 65 min |
| Apr 27, 8:24 AM CDT | Tornado Warning | LSX | Calhoun, Pike | 51 min |
| Apr 27, 8:57 AM CDT | Severe Thunderstorm Warning | LSX | Greene, Pike | 48 min |
| Apr 27, 9:03 AM CDT | Tornado Warning | LSX | Greene, Pike | 42 min |
| Apr 27, 9:44 AM CDT | Severe Thunderstorm Warning | LSX | Greene, Macoupin | 61 min |
| Apr 27, 10:29 AM CDT | Severe Thunderstorm Warning | LSX | Macoupin, Montgomery | 61 min |
| Apr 27, 10:52 AM CDT | Severe Thunderstorm Warning | LSX | Macoupin, Montgomery | 42 min |
| Apr 27, 11:18 AM CDT | Flood Watch | LSX | Bond, Calhoun, Clinton, Fayette, Greene, Jersey and 7 more | 10 hr |
| Apr 27, 12:09 PM CDT | Areal Flood Advisory | LSX | Calhoun | 3 hr |
| Apr 27, 12:27 PM CDT | Tornado Warning | LSX | Madison, Saint Clair | 48 min |
| Apr 27, 1:07 PM CDT | Flash Flood Warning | LSX | Fayette, Montgomery | 7 hr |
| Apr 27, 1:13 PM CDT | Tornado Warning | LSX | Madison | 47 min |
| Apr 27, 1:49 PM CDT | Tornado Warning | LSX | Bond, Madison | 14 min |
| Apr 27, 1:55 PM CDT | Severe Thunderstorm Warning | LSX | Madison, Saint Clair | 45 min |
| Apr 27, 2:01 PM CDT | Tornado Warning | LSX | Madison, Saint Clair | 27 min |
| Apr 27, 2:30 PM CDT | Severe Thunderstorm Warning | LSX | Bond, Clinton, Madison | 27 min |
| Apr 27, 3:05 PM CDT | River Flood Warning | LSX | Jackson, Randolph | 8 days |
| Apr 27, 3:13 PM CDT | River Flood Warning | LSX | Pike, Scott | 9 days |
| Apr 27, 3:14 PM CDT | Severe Thunderstorm Warning | LSX | Calhoun, Greene, Jersey, Madison | 46 min |
| Apr 27, 3:16 PM CDT | River Flood Warning | LSX | Fayette | 4 days |
| Apr 27, 3:19 PM CDT | Tornado Warning | LSX | Calhoun, Jersey, Madison | 41 min |
| Apr 27, 3:46 PM CDT | Severe Thunderstorm Warning | LSX | Adams, Pike | 44 min |
| Apr 27, 3:52 PM CDT | Severe Thunderstorm Warning | LSX | Jersey, Macoupin, Madison | 38 min |
| Apr 27, 4:20 PM CDT | Severe Thunderstorm Warning | LSX | Adams, Brown, Pike | 55 min |
| Apr 27, 4:34 PM CDT | Tornado Warning | LSX | Adams, Brown | 29 min |
| Apr 27, 4:46 PM CDT | Tornado Warning | LSX | Calhoun, Pike | 44 min |
| Apr 27, 4:52 PM CDT | Flash Flood Warning | LSX | Adams, Pike | 4 hr |
| Apr 27, 5:20 PM CDT | Flash Flood Warning | LSX | Brown, Pike | 3 hr |
| Apr 27, 5:21 PM CDT | Severe Thunderstorm Warning | LSX | Calhoun, Greene, Pike | 39 min |
| Apr 27, 5:27 PM CDT | Severe Thunderstorm Warning | LSX | Calhoun, Greene | 33 min |
| Apr 27, 5:32 PM CDT | Flash Flood Warning | LSX | Jersey | 5 hr |
| Apr 27, 5:32 PM CDT | Severe Thunderstorm Warning | LSX | Calhoun, Greene, Jersey, Macoupin | 43 min |
| Apr 27, 5:47 PM CDT | Severe Thunderstorm Warning | LSX | Calhoun, Greene, Jersey | 58 min |
| Apr 27, 5:50 PM CDT | Severe Thunderstorm Warning | LSX | Greene, Jersey, Macoupin | 40 min |
| Apr 27, 5:59 PM CDT | Severe Thunderstorm Warning | LSX | Calhoun, Jersey | 46 min |
| Apr 27, 6:01 PM CDT | Tornado Warning | LSX | Jersey, Macoupin | 44 min |
| Apr 27, 6:09 PM CDT | Severe Thunderstorm Warning | LSX | Greene, Macoupin | 21 min |
| Apr 27, 6:28 PM CDT | Severe Thunderstorm Warning | LSX | Bond, Calhoun, Fayette, Jersey, Macoupin, Madison and 1 more | 47 min |
| Apr 27, 6:41 PM CDT | Tornado Warning | LSX | Calhoun, Jersey, Madison | 32 min |
Nearby
Flash Flood Warnings in Illinois, 2026Every flash flood warning in 2026
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.