Alert archive / Illinois / Flash Flood Watches in 2021
Flash Flood Watch 2, NWS Lincoln, IL
NWS Lincoln, IL issued this flash flood watch at May 17, 2021, 9:22 PM CDT for Sangamon County, Illinois. It was in force for 13 hr.
The area
The counties it named.
The facts
- Issued
- May 17, 2021, 9:22 PM CDT (02:22 UTC)
- Expired
- May 18, 2021, 10:19 AM CDT
- In force
- 13 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 02:25 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, 2.4 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.
- Mixed-layer CAPE
- 5 J/kg
- Mixed-layer CIN
- -69 J/kg
- Mixed-layer LCL
- 822 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 58 m²/s²
- 0-3 km storm-relative helicity
- 150 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
161 WGUS63 KILX 180222 FFAILX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Lincoln IL 922 PM CDT Mon May 17 2021 .DAM FLOODGATE RELEASE IMPACTING SUGAR CREEK BELOW SPAULDING DAM IN SANGAMON COUNTY. ILZ051-181030- /O.NEW.KILX.FF.A.0002.210518T0222Z-210518T2100Z/ /00000.0.DR.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Sangamon- Including the cities of Springfield 922 PM CDT Mon May 17 2021 ...FLASH FLOOD WATCH FOR A DAM FLOODGATE RELEASE IN EFFECT THROUGH TUESDAY AFTERNOON... The National Weather Service in Lincoln has issued a * Flash Flood Watch for a portion of central Illinois, including the following area, Sangamon. * Through Tuesday afternoon * At 922 PM CDT, dam operators reported the Spaulding Dam on the Sugar Creek may experience a significant floodgate release during the watch period. * Some locations that may experience flash flooding include... Springfield, Chatham, Auburn, Sherman, Rochester, Riverton, Pawnee, Williamsville, New Berlin, Ashland, Divernon, Illiopolis, Pleasant Plains, Loami, Mechanicsburg, Jerome, Southern View, Leland Grove, Grandview and Spaulding. $$ Deubelbeiss
2 follow-up statements
233 WGUS63 KILX 180935 FFAILX Flood Watch National Weather Service Lincoln IL 435 AM CDT Tue May 18 2021 .DAM FLOODGATE RELEASE IMPACTING SUGAR CREEK BELOW SPAULDING DAM IN SANGAMON COUNTY. ILZ051-182100- /O.CON.KILX.FF.A.0002.000000T0000Z-210518T2100Z/ /00000.0.DR.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Sangamon- Including the cities of Springfield 435 AM CDT Tue May 18 2021 ...FLASH FLOOD WATCH FOR A DAM FLOODGATE RELEASE REMAINS IN EFFECT UNTIL 4 PM CDT THIS AFTERNOON... The Flash Flood Watch continues for * A portion of central Illinois, including the following area, Sangamon. * Until 4 PM CDT this afternoon At 435 AM CDT, dam operators reported the Spaulding Dam on the Sugar Creek may experience a significant floodgate release during the watch period. Some locations that may experience flash flooding include... locations near Sugar Creek downstream of the Spaulding Dam. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that conditions may develop that lead to Flash Flooding. Flash Flooding is a very dangerous situation. You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Shimon
836 WGUS63 KILX 181519 FFAILX Flood Watch National Weather Service Lincoln IL 1019 AM CDT Tue May 18 2021 ILZ051-181630- /O.CAN.KILX.FF.A.0002.000000T0000Z-210518T2100Z/ /00000.0.DR.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Sangamon- Including the cities of Springfield 1019 AM CDT Tue May 18 2021 ...FLASH FLOOD WATCH FOR A DAM FLOODGATE RELEASE IS CANCELLED... The Flash Flood Watch for a portion of central Illinois, including the following county, Sangamon has been cancelled. The Flash Flood Watch downstream of the Spaulding Dam is cancelled. Flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. $$ Roberson
The office that day
Everything else NWS Lincoln, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 18, 6:19 PM CDT | River Flood Warning | ILX | Fulton, Knox | 71 hr |
Nearby
Flash Flood Watches in Illinois, 2021Every flash flood watch in 2021
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.