Alert archive / Missouri / Flash Flood Watches in 2021
Flash Flood Watch 2, NWS St. Louis, MO
NWS St. Louis, MO issued this flash flood watch at Apr 27, 2021, 2:28 PM CDT for 8 counties in Missouri; 6 counties in Illinois. It took effect at Apr 28, 2021, 1:00 PM CDT. It was in force for 16 hr.
The area
The counties it named.
The facts
- Issued
- Apr 27, 2021, 2:28 PM CDT (19:28 UTC)
- In effect from
- Apr 28, 2021, 1:00 PM CDT
- Expired
- Apr 29, 2021, 5:03 AM CDT
- In force
- 16 hr
- Issued by
- NWS St. Louis, MO
- Flood severity
- None
Counties Clinton County, IL, Marion County, IL, Monroe County, IL, Randolph County, IL, Saint Clair County, IL, Washington County, IL, Crawford County, MO, Iron County, MO, Jefferson County, MO, Madison County, MO, Reynolds County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, Washington County, MO
The radar
The St Louis radar (KLSX), 83 km from the middle of the area, began a volume at 19:28 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 12:00Z, 7.5 hours before the alert went out and 272 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
- 1542 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 283 m²/s²
- 0-3 km storm-relative helicity
- 389 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
997 WGUS63 KLSX 271928 FFALSX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service St Louis MO 228 PM CDT Tue Apr 27 2021 ILZ069-070-074-079-101-102-MOZ065-072>075-084-085-099-281000- /O.NEW.KLSX.FF.A.0002.210428T1800Z-210429T1500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Clinton IL-Marion IL-Washington IL-Randolph IL-Saint Clair-Monroe IL-Jefferson MO-Crawford MO-Washington MO-Saint Francois MO- Sainte Genevieve MO-Iron MO-Madison MO-Reynolds MO- Including the cities of Cahokia, Centralia, Farmington, Sparta, Belleville, Salem, and Chester 228 PM CDT Tue Apr 27 2021 ...FLASH FLOOD WATCH IN EFFECT FROM WEDNESDAY AFTERNOON THROUGH THURSDAY MORNING... The National Weather Service in St Louis has issued a * Flash Flood Watch for Portions of Illinois, including the following areas, Clinton IL, Marion IL, Monroe IL, Randolph IL, Saint Clair and Washington IL. Portions of Missouri, including the following areas, Crawford MO, Iron MO, Jefferson MO, Madison MO, Reynolds MO, Saint Francois MO, Sainte Genevieve MO and Washington MO. * From Wednesday afternoon through Thursday morning. * Several rounds of heavy rain, especially Wednesday afternoon, may cause flash flooding. * Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Low-water crossings may be flooded. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Carney
4 follow-up statements
047 WGUS63 KLSX 280824 FFALSX Flood Watch National Weather Service St Louis MO 324 AM CDT Wed Apr 28 2021 ILZ069-070-074-079-101-102-MOZ065-072>075-084-085-099-282130- /O.CON.KLSX.FF.A.0002.210428T1800Z-210429T1500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Clinton IL-Marion IL-Washington IL-Randolph IL-Saint Clair-Monroe IL-Jefferson MO-Crawford MO-Washington MO-Saint Francois MO- Sainte Genevieve MO-Iron MO-Madison MO-Reynolds MO- Including the cities of Cahokia, Centralia, Farmington, Sparta, Belleville, Salem, and Chester 324 AM CDT Wed Apr 28 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT FROM 1 PM CDT THIS AFTERNOON THROUGH THURSDAY MORNING... The Flash Flood Watch continues for * Portions of Illinois, including the following areas, Clinton IL, Marion IL, Monroe IL, Randolph IL, Saint Clair and Washington IL. Portions of Missouri, including the following areas, Crawford MO, Iron MO, Jefferson MO, Madison MO, Reynolds MO, Saint Francois MO, Sainte Genevieve MO and Washington MO. * From 1 PM CDT this afternoon through Thursday morning. * Several rounds of heavy rain, especially Wednesday afternoon and night, may cause flash flooding. * Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. Low-water crossings may be flooded. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Gosselin
611 WGUS63 KLSX 282023 FFALSX Flood Watch National Weather Service St Louis MO 323 PM CDT Wed Apr 28 2021 ILZ069-070-074-079-101-102-MOZ065-072>075-084-085-099-291000- /O.CON.KLSX.FF.A.0002.000000T0000Z-210429T1500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Clinton IL-Marion IL-Washington IL-Randolph IL-Saint Clair-Monroe IL-Jefferson MO-Crawford MO-Washington MO-Saint Francois MO- Sainte Genevieve MO-Iron MO-Madison MO-Reynolds MO- Including the cities of Cahokia, Centralia, Farmington, Sparta, Belleville, Salem, and Chester 323 PM CDT Wed Apr 28 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH THURSDAY MORNING... The Flash Flood Watch continues for * Portions of Illinois, including the following areas, Clinton IL, Marion IL, Monroe IL, Randolph IL, Saint Clair and Washington IL. Portions of Missouri, including the following areas, Crawford MO, Iron MO, Jefferson MO, Madison MO, Reynolds MO, Saint Francois MO, Sainte Genevieve MO and Washington MO. * Through Thursday morning. * Several rounds of heavy rain tonight into Thursday morning may cause flash flooding. * Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. Low-water crossings may be flooded. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ GKS
162 WGUS63 KLSX 290852 FFALSX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service St Louis MO 352 AM CDT Thu Apr 29 2021 ILZ101-102-MOZ065-072-073-291000- /O.CAN.KLSX.FF.A.0002.000000T0000Z-210429T1500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Saint Clair-Monroe IL-Jefferson MO-Crawford MO-Washington MO- Including the cities of Belleville and Cahokia 352 AM CDT Thu Apr 29 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for Portions of southwest Illinois, including the following areas, Monroe IL and Saint Clair. Portions of east central Missouri, including the following areas, Crawford MO, Jefferson MO and Washington MO has been cancelled. The Flood Watch is cancelled with rainfall moving out of the area. $$ ILZ069-070-074-079-MOZ074-075-084-085-099-291200- /O.EXT.KLSX.FF.A.0002.000000T0000Z-210429T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Clinton IL-Marion IL-Washington IL-Randolph IL-Saint Francois MO- Sainte Genevieve MO-Iron MO-Madison MO-Reynolds MO- Including the cities of Centralia, Farmington, Salem, Chester, and Sparta 352 AM CDT Thu Apr 29 2021 ...FLASH FLOOD WATCH NOW IN EFFECT UNTIL 7 AM CDT THIS MORNING... The Flash Flood Watch is now in effect for * Portions of Illinois, including the following areas, Clinton IL, Marion IL, Randolph IL and Washington IL. Portions of southeast Missouri, including the following areas, Iron MO, Madison MO, Reynolds MO, Saint Francois MO and Sainte Genevieve MO. * Until 7 AM CDT this morning. * Heavy Rainfall * Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. Low-water crossings may be flooded. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Gosselin
561 WGUS63 KLSX 291003 FFALSX Flood Watch National Weather Service St Louis MO 503 AM CDT Thu Apr 29 2021 ILZ069-070-074-079-MOZ074-075-084-085-099-291115- /O.CAN.KLSX.FF.A.0002.000000T0000Z-210429T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Clinton IL-Marion IL-Washington IL-Randolph IL-Saint Francois MO- Sainte Genevieve MO-Iron MO-Madison MO-Reynolds MO- Including the cities of Centralia, Farmington, Salem, Chester, and Sparta 503 AM CDT Thu Apr 29 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for Portions of Illinois, including the following areas, Clinton IL, Marion IL, Randolph IL and Washington IL. Portions of southeast Missouri, including the following areas, Iron MO, Madison MO, Reynolds MO, Saint Francois MO and Sainte Genevieve MO. has been cancelled. The Flood Watch is cancelled. Flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. $$ Gosselin
Nearby
Flash Flood Watches in Missouri, 2021Flash 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.