Alert archive / Illinois / Flash Flood Watches in 2023

Flash Flood Watch 1, NWS Lincoln, IL

May 8, 2023Sangamon County, Illinois

NWS Lincoln, IL issued this flash flood watch at May 8, 2023, 12:26 AM CDT for Sangamon County, Illinois. It was in force for 31 hr.

The area

The counties it named.

The facts

Issued: May 8, 2023, 12:26 AM CDT (05:26 UTC)
Expired: May 9, 2023, 7:37 AM CDT
In force: 31 hr
Issued by: NWS Lincoln, IL
Flood severity: None

County Sangamon County, IL

The radar

The Lincoln radar (KILX), 52 km from the middle of the area, began a volume at 05:29 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, 5.4 hours before the alert went out and 100 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 2003 J/kg
Mixed-layer CIN: -80 J/kg
Mixed-layer LCL: 822 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: -67 m²/s²
0-3 km storm-relative helicity: -65 m²/s²
Significant tornado parameter: -0.6
Supercell composite: -3.3

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Lincoln, IL wrote its last area forecast discussion before this flash flood watch went out at May 7, 9:31 PM CDT, 2 hours 55 minutes earlier.

Area forecast discussion, May 7, 9:31 PM CDT, 2 hours 55 minutes before

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Hazardous weather outlook, May 7, 3:12 PM CDT, 9 hours 14 minutes before

Hazardous Weather Outlook
National Weather Service Lincoln IL
312 PM CDT Sun May 7 2023

ILZ027>031-036>038-040>057-061>063-066>068-071>073-081645-
Knox-Stark-Peoria-Marshall-Woodford-Fulton-Tazewell-McLean-Schuyler-
Mason-Logan-De Witt-Piatt-Champaign-Vermilion-Cass-Menard-Scott-
Morgan-Sangamon-Christian-Macon-Moultrie-Douglas-Coles-Edgar-Shelby-
Cumberland-Clark-Effingham-Jasper-Crawford-Clay-Richland-Lawrence-
312 PM CDT Sun May 7 2023

This Hazardous Weather Outlook is for central Illinois, east
central Illinois, southeast Illinois and west central Illinois.

.DAY ONE...This afternoon and tonight.

Scattered thunderstorms are expected to develop this afternoon and
persist into early evening, focused along an outflow boundary from
near Springfield to just west of Peoria. Storms this evening should
develop near this boundary, then move east-northeast at around 20 to
30 mph. Tonight, a line of storms will likely develop and push
southeast across central IL after midnight. Both rounds of
thunderstorms could be severe with damaging winds and large hail
being the primary hazards. An isolated flash flood risk may develop
if thunderstorms repeatedly affect the same location.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Periods of thunderstorms are expected ahead of a cold front on
Monday. Severe storms will again be possible. Damaging wind gusts
and large hail are the primary hazards. An isolated flash flood risk
may develop if thunderstorms repeatedly affect the same location.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed this afternoon and tonight.

25/AAT

In the hours before

Local storm report, May 7, 10:38 PM CDT, 1 hour 48 minutes before

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Local storm report, May 7, 10:47 PM CDT, 1 hour 39 minutes before

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Local storm report, May 7, 10:52 PM CDT, 1 hour 34 minutes before

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Local storm report, May 7, 11:17 PM CDT, 1 hour 9 minutes before

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Local storm report, May 7, 11:20 PM CDT, 1 hour 6 minutes before

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Special weather statement, May 8, 12:04 AM CDT, 22 minutes before

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The office that day

Everything else NWS Lincoln, IL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 7, 7:00 PM CDT	Severe Thunderstorm Warning Considerable damage threat	ILX	Sangamon	13 min
May 7, 7:11 PM CDT	Severe Thunderstorm Warning	ILX	Knox, Marshall, Peoria, Stark	64 min
May 7, 7:27 PM CDT	Severe Thunderstorm Warning	ILX	Cass, Schuyler	31 min
May 7, 7:32 PM CDT	Severe Thunderstorm Warning	ILX	Fulton	43 min
May 7, 7:58 PM CDT	Severe Thunderstorm Warning	ILX	Fulton, Knox, Peoria	35 min
May 7, 8:06 PM CDT	Severe Thunderstorm Warning Considerable damage threat	ILX	Fulton, Mason	19 min
May 7, 8:19 PM CDT	Flash Flood Warning	ILX	Sangamon	3 hr
May 7, 8:30 PM CDT	Severe Thunderstorm Warning	ILX	Fulton	60 min
May 7, 8:37 PM CDT	Severe Thunderstorm Warning	ILX	Schuyler	53 min
May 7, 8:52 PM CDT	Severe Thunderstorm Warning	ILX	McLean, Tazewell, Woodford	38 min
May 7, 9:24 PM CDT	Severe Thunderstorm Warning	ILX	DeWitt, McLean	32 min
May 7, 9:35 PM CDT	Flash Flood Warning	ILX	Cass, Fulton, Mason, Menard, Morgan, Sangamon and 1 more	115 min
May 7, 9:40 PM CDT	Flash Flood Warning	ILX	Christian, Sangamon	110 min
May 7, 9:46 PM CDT	Special Weather Statement	ILX	Cass, Morgan, Scott	59 min
May 7, 10:02 PM CDT	Special Weather Statement	ILX	Champaign, Christian, Douglas, Macon, Moultrie, Piatt and 2 more	43 min
May 8, 3:42 AM CDT	Special Weather Statement	ILX	Fulton, Peoria	63 min
May 8, 4:33 AM CDT	Special Weather Statement	ILX	Menard, Morgan, Sangamon	27 min

Nearby

Flash Flood Watches in Illinois, 2023 Every flash flood watch in 2023

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.