Alert archive / Missouri / Flash Flood Watches in 2021
Flash Flood Watch 6, NWS St. Louis, MO
NWS St. Louis, MO issued this flash flood watch at Jul 9, 2021, 2:53 AM CDT for 29 counties in Missouri; 17 counties in Illinois. It took effect at Jul 9, 2021, 7:00 PM CDT. It was in force for 31 hr.
The area
The counties it named.
The facts
- Issued
- Jul 9, 2021, 2:53 AM CDT (07:53 UTC)
- In effect from
- Jul 9, 2021, 7:00 PM CDT
- Expired
- Jul 11, 2021, 2:16 AM CDT
- In force
- 31 hr
- Issued by
- NWS St. Louis, MO
- Flood severity
- None
All 46 counties
Adams County, IL, Bond County, IL, Brown County, IL, Calhoun County, IL, Clinton County, IL, Fayette County, IL, Greene County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Montgomery County, IL, Pike County, IL, Randolph County, IL, Saint Clair County, IL, Washington County, IL, Audrain County, MO, Boone County, MO, Callaway County, MO, City of Saint Louis, MO, Cole County, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Iron County, MO, Jefferson County, MO, Knox County, MO, Lewis County, MO, Lincoln County, MO, Madison County, MO, Marion County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Osage County, MO, Pike County, MO, Ralls County, MO, Reynolds County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Shelby County, MO, Warren County, MO, Washington County, MO
The radar
The St Louis radar (KLSX), 18 km from the middle of the area, began a volume at 07:54 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, 7.9 hours before the alert went out and 241 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
- 2 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 943 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- -1 m²/s²
- 0-3 km storm-relative helicity
- 63 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
932 WGUS63 KLSX 090753 FFALSX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service St Louis MO 253 AM CDT Fri Jul 9 2021 ILZ095>097-MOZ018-019-026-027-035-036-092300- /O.NEW.KLSX.FF.A.0006.210710T0000Z-210710T1500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Adams IL-Brown IL-Pike IL-Knox MO-Lewis MO-Shelby MO-Marion MO- Ralls MO-Pike MO- Including the cities of Hannibal, Mount Sterling, Bowling Green, Quincy, and Pittsfield 253 AM CDT Fri Jul 9 2021 ...FLASH FLOOD WATCH IN EFFECT FROM THIS EVENING THROUGH SATURDAY MORNING... The National Weather Service in St Louis has issued a * Flash Flood Watch for Portions of west central Illinois, including the following areas, Adams IL, Brown IL and Pike IL. Portions of northeast Missouri, including the following areas, Knox MO, Lewis MO, Marion MO, Pike MO, Ralls MO and Shelby MO. * From this evening through Saturday morning. * Multiple rounds of showers and thunderstorms capable of producing heavy rainfall are expected across the watch area. * Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Gosselin
6 follow-up statements
988 WGUS63 KLSX 091944 FFALSX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service St Louis MO 244 PM CDT Fri Jul 9 2021 MOZ034-101100- /O.EXA.KLSX.FF.A.0006.210710T0000Z-210710T1500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Monroe MO- 244 PM CDT Fri Jul 9 2021 ...FLASH FLOOD WATCH IN EFFECT FROM 7 PM CDT THIS EVENING THROUGH SATURDAY MORNING... The National Weather Service in St Louis has expanded the * Flash Flood Watch to include A portion of northeast Missouri, including the following area, Monroe MO. * From 7 PM CDT this evening through Saturday morning. * Multiple rounds of showers and thunderstorms capable of producing heavy rainfall are expected across the watch area. * Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ ILZ095>097-MOZ018-019-026-027-035-036-101100- /O.CON.KLSX.FF.A.0006.210710T0000Z-210710T1500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Adams IL-Brown IL-Pike IL-Knox MO-Lewis MO-Shelby MO-Marion MO- Ralls MO-Pike MO- Including the cities of Hannibal, Mount Sterling, Bowling Green, Quincy, and Pittsfield 244 PM CDT Fri Jul 9 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT FROM 7 PM CDT THIS EVENING THROUGH SATURDAY MORNING... The Flash Flood Watch continues for * Portions of west central Illinois, including the following areas, Adams IL, Brown IL and Pike IL. Portions of northeast Missouri, including the following areas, Knox MO, Lewis MO, Marion MO, Pike MO, Ralls MO and Shelby MO. * From 7 PM CDT this evening through Saturday morning. * Multiple rounds of showers and thunderstorms capable of producing heavy rainfall are expected across the watch area. * Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Carney
795 WGUS63 KLSX 100341 FFALSX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service St Louis MO 1041 PM CDT Fri Jul 9 2021 MOZ041-042-047>052-059-060-101800- /O.EXB.KLSX.FF.A.0006.000000T0000Z-210710T1800Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Boone MO-Audrain MO-Moniteau MO-Cole MO-Osage MO-Callaway MO- Montgomery MO-Lincoln MO-Gasconade MO-Warren MO- Including the cities of Jefferson City, Columbia, Fulton, and Mexico 1041 PM CDT Fri Jul 9 2021 ...FLASH FLOOD WATCH IN EFFECT THROUGH SATURDAY AFTERNOON... The National Weather Service in St Louis has expanded the * Flash Flood Watch to include Portions of central and east central Missouri, including the following areas, in central Missouri, Audrain MO, Boone MO, Callaway MO, Cole MO, Moniteau MO and Osage MO. In east central Missouri, Gasconade MO, Lincoln MO, Montgomery MO and Warren MO. * Through Saturday afternoon. * Multiple rounds of showers and thunderstorms with heavy rainfall expected over similar locations across the watch area. * Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ ILZ095>097-MOZ018-019-026-027-034>036-101800- /O.EXT.KLSX.FF.A.0006.000000T0000Z-210710T1800Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Adams IL-Brown IL-Pike IL-Knox MO-Lewis MO-Shelby MO-Marion MO- Monroe MO-Ralls MO-Pike MO- Including the cities of Hannibal, Mount Sterling, Bowling Green, Quincy, and Pittsfield 1041 PM CDT Fri Jul 9 2021 ...FLASH FLOOD WATCH NOW IN EFFECT THROUGH SATURDAY AFTERNOON... The Flash Flood Watch is now in effect for * Portions of west central Illinois, including the following areas, Adams IL, Brown IL and Pike IL. Portions of northeast Missouri, including the following areas, Knox MO, Lewis MO, Marion MO, Monroe MO, Pike MO, Ralls MO and Shelby MO. * Through Saturday afternoon. * Multiple rounds of showers and thunderstorms with heavy rainfall expected over similar locations across the watch area. * Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Pfahler
102 WGUS63 KLSX 100810 FFALSX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service St Louis MO 310 AM CDT Sat Jul 10 2021 ILZ058>060-064-065-069-070-074-079-098>102-MOZ061>065-072>075-084- 085-099-102315- /O.EXB.KLSX.FF.A.0006.000000T0000Z-210711T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Greene IL-Macoupin IL-Montgomery IL-Bond IL-Fayette IL-Clinton IL- Marion IL-Washington IL-Randolph IL-Calhoun IL-Jersey IL-Madison IL-Saint Clair-Monroe IL-Saint Charles MO-Franklin MO-Saint Louis MO-Saint Louis City MO-Jefferson MO-Crawford MO-Washington MO- Saint Francois MO-Sainte Genevieve MO-Iron MO-Madison MO-Reynolds MO- Including the cities of Cahokia, Saint Charles, Sparta, Litchfield, Farmington, Alton, Washington, Saint Louis, Centralia, Belleville, Salem, Edwardsville, Chester, Union, Sullivan, and Vandalia 310 AM CDT Sat Jul 10 2021 ...FLASH FLOOD WATCH IN EFFECT THROUGH SUNDAY MORNING... The National Weather Service in St Louis has expanded the * Flash Flood Watch to include Portions of Illinois, including the following areas, Bond IL, Calhoun IL, Clinton IL, Fayette IL, Greene IL, Jersey IL, Macoupin IL, Madison IL, Marion IL, Monroe IL, Montgomery IL, Randolph IL, Saint Clair and Washington IL. Portions of Missouri, including the following areas, Crawford MO, Franklin MO, Iron MO, Jefferson MO, Madison MO, Reynolds MO, Saint Charles MO, Saint Francois MO, Saint Louis City MO, Saint Louis MO, Sainte Genevieve MO and Washington MO. * Through Sunday morning. * Multiple rounds of showers and thunderstorms with heavy rainfall expected over similar locations across the watch area. * Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ ILZ095>097-MOZ018-019-026-027-034>036-041-042-047>052-059-060-102315- /O.EXT.KLSX.FF.A.0006.000000T0000Z-210711T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Adams IL-Brown IL-Pike IL-Knox MO-Lewis MO-Shelby MO-Marion MO- Monroe MO-Ralls MO-Pike MO-Boone MO-Audrain MO-Moniteau MO-Cole MO-Osage MO-Callaway MO-Montgomery MO-Lincoln MO-Gasconade MO- Warren MO- Including the cities of Mount Sterling, Columbia, Quincy, Pittsfield, Mexico, Bowling Green, Jefferson City, Hannibal, and Fulton 310 AM CDT Sat Jul 10 2021 ...FLASH FLOOD WATCH NOW IN EFFECT THROUGH SUNDAY MORNING... The Flash Flood Watch is now in effect for * Portions of west central Illinois, including the following areas, Adams IL, Brown IL and Pike IL. Portions of Missouri, including the following areas, Audrain MO, Boone MO, Callaway MO, Cole MO, Gasconade MO, Knox MO, Lewis MO, Lincoln MO, Marion MO, Moniteau MO, Monroe MO, Montgomery MO, Osage MO, Pike MO, Ralls MO, Shelby MO and Warren MO. * Through Sunday morning. * Multiple rounds of showers and thunderstorms with heavy rainfall expected over similar locations across the watch area. * Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Gosselin
422 WGUS63 KLSX 102112 FFALSX Flood Watch National Weather Service St Louis MO 412 PM CDT Sat Jul 10 2021 ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027- 034>036-041-042-047>052-059>065-072>075-084-085-099-111200- /O.CON.KLSX.FF.A.0006.000000T0000Z-210711T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Greene IL-Macoupin IL-Montgomery IL-Bond IL-Fayette IL-Clinton IL- Marion IL-Washington IL-Randolph IL-Adams IL-Brown IL-Pike IL- Calhoun IL-Jersey IL-Madison IL-Saint Clair-Monroe IL-Knox MO- Lewis MO-Shelby MO-Marion MO-Monroe MO-Ralls MO-Pike MO-Boone MO- Audrain MO-Moniteau MO-Cole MO-Osage MO-Callaway MO-Montgomery MO- Lincoln MO-Gasconade MO-Warren MO-Saint Charles MO-Franklin MO- Saint Louis MO-Saint Louis City MO-Jefferson MO-Crawford MO- Washington MO-Saint Francois MO-Sainte Genevieve MO-Iron MO- Madison MO-Reynolds MO- Including the cities of Mount Sterling, Quincy, Cahokia, Union, Bowling Green, Columbia, Pittsfield, Alton, Sparta, Centralia, Farmington, Vandalia, Litchfield, Saint Louis, Jefferson City, Belleville, Edwardsville, Chester, Hannibal, Fulton, Saint Charles, Mexico, Sullivan, Washington, and Salem 412 PM CDT Sat Jul 10 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH SUNDAY MORNING... The Flash Flood Watch continues for * Portions of Illinois, including the following areas, Adams IL, Bond IL, Brown IL, Calhoun IL, Clinton IL, Fayette IL, Greene IL, Jersey IL, Macoupin IL, Madison IL, Marion IL, Monroe IL, Montgomery IL, Pike IL, Randolph IL, Saint Clair and Washington IL. Portions of Missouri, including the following areas, Audrain MO, Boone MO, Callaway MO, Cole MO, Crawford MO, Franklin MO, Gasconade MO, Iron MO, Jefferson MO, Knox MO, Lewis MO, Lincoln MO, Madison MO, Marion MO, Moniteau MO, Monroe MO, Montgomery MO, Osage MO, Pike MO, Ralls MO, Reynolds MO, Saint Charles MO, Saint Francois MO, Saint Louis City MO, Saint Louis MO, Sainte Genevieve MO, Shelby MO, Warren MO and Washington MO. * Through Sunday morning. * Multiple rounds of showers and thunderstorms with heavy rainfall expected over similar locations across the watch area. * Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Carney
097 WGUS63 KLSX 110007 FFALSX Flood Watch National Weather Service St Louis MO 707 PM CDT Sat Jul 10 2021 ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027- 034>036-041-042-047>052-059>065-110115- /O.CAN.KLSX.FF.A.0006.000000T0000Z-210711T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Greene IL-Macoupin IL-Montgomery IL-Bond IL-Fayette IL-Clinton IL- Marion IL-Washington IL-Randolph IL-Adams IL-Brown IL-Pike IL- Calhoun IL-Jersey IL-Madison IL-Saint Clair-Monroe IL-Knox MO- Lewis MO-Shelby MO-Marion MO-Monroe MO-Ralls MO-Pike MO-Boone MO- Audrain MO-Moniteau MO-Cole MO-Osage MO-Callaway MO-Montgomery MO- Lincoln MO-Gasconade MO-Warren MO-Saint Charles MO-Franklin MO- Saint Louis MO-Saint Louis City MO-Jefferson MO- Including the cities of Mount Sterling, Quincy, Cahokia, Union, Bowling Green, Columbia, Pittsfield, Alton, Sparta, Centralia, Vandalia, Litchfield, Saint Louis, Jefferson City, Belleville, Edwardsville, Chester, Hannibal, Fulton, Saint Charles, Mexico, Sullivan, Washington, and Salem 707 PM CDT Sat Jul 10 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for Portions of Illinois, including the following areas, Adams IL, Bond IL, Brown IL, Calhoun IL, Clinton IL, Fayette IL, Greene IL, Jersey IL, Macoupin IL, Madison IL, Marion IL, Monroe IL, Montgomery IL, Pike IL, Randolph IL, Saint Clair and Washington IL. Portions of Missouri, including the following areas, Audrain MO, Boone MO, Callaway MO, Cole MO, Franklin MO, Gasconade MO, Jefferson MO, Knox MO, Lewis MO, Lincoln MO, Marion MO, Moniteau MO, Monroe MO, Montgomery MO, Osage MO, Pike MO, Ralls MO, Saint Charles MO, Saint Louis City MO, Saint Louis MO, Shelby MO and Warren MO. has been cancelled. The threat for prolonged heavy rain has ended. Therefore The Flash Flood Watch is cancelled. $$ MOZ072>075-084-085-099-111200- /O.CON.KLSX.FF.A.0006.000000T0000Z-210711T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Crawford MO-Washington MO-Saint Francois MO-Sainte Genevieve MO- Iron MO-Madison MO-Reynolds MO- Including the cities of Farmington 707 PM CDT Sat Jul 10 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 7 AM CDT SUNDAY... The Flash Flood Watch continues for * Portions of east central and southeast Missouri, including the following areas, in east central Missouri, Crawford MO and Washington MO. In southeast Missouri, Iron MO, Madison MO, Reynolds MO, Saint Francois MO and Sainte Genevieve MO. * Until 7 AM CDT Sunday. * Multiple rounds of showers and thunderstorms with heavy rainfall expected over similar locations across the watch area. * Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Carney
483 WGUS63 KLSX 110716 FFALSX Flood Watch National Weather Service St Louis MO 216 AM CDT Sun Jul 11 2021 MOZ072>075-084-085-099-110830- /O.CAN.KLSX.FF.A.0006.000000T0000Z-210711T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Crawford MO-Washington MO-Saint Francois MO-Sainte Genevieve MO- Iron MO-Madison MO-Reynolds MO- Including the cities of Farmington 216 AM CDT Sun Jul 11 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for Portions of east central and southeast Missouri, including the following areas, in east central Missouri, Crawford MO and Washington MO. In southeast Missouri, 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.