Alert archive / Missouri / Heat Advisories in 2020
Heat Advisory 2, NWS St. Louis, MO
NWS St. Louis, MO issued this heat advisory at Jul 17, 2020, 1:59 AM CDT for 29 counties in Missouri; 17 counties in Illinois. It took effect at Jul 18, 2020, 12:00 PM CDT. It was in force for 31 hr.
The area
The counties it named.
The facts
- Issued
- Jul 17, 2020, 1:59 AM CDT (06:59 UTC)
- In effect from
- Jul 18, 2020, 12:00 PM CDT
- Expired
- Jul 19, 2020, 7:00 PM CDT
- In force
- 31 hr
- Issued by
- NWS St. Louis, MO
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 07:00 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, 7.0 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1197 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- -12 m²/s²
- 0-3 km storm-relative helicity
- 15 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
667 WWUS73 KLSX 170659 NPWLSX URGENT - WEATHER MESSAGE National Weather Service Saint Louis MO 159 AM CDT Fri Jul 17 2020 ILZ058>060-064-065-069-070-074-079-097>099-MOZ034>036-041-042- 047>052-059-060-062-072>075-084-085-099-172200- /O.NEW.KLSX.HT.Y.0002.200718T1700Z-200720T0000Z/ Audrain MO-Bond IL-Boone MO-Calhoun IL-Callaway MO-Clinton IL- Cole MO-Crawford MO-Fayette IL-Franklin MO-Gasconade MO-Greene IL- Iron MO-Jersey IL-Lincoln MO-Macoupin IL-Madison MO-Marion IL- Moniteau MO-Monroe MO-Montgomery IL-Montgomery MO-Osage MO- Pike IL-Pike MO-Ralls MO-Randolph IL-Reynolds MO- Saint Francois MO-Sainte Genevieve MO-Warren MO-Washington IL- Washington MO- Including the cities of Bowling Green, Centralia, Chester, Columbia, Farmington, Fulton, Jefferson City, Litchfield, Mexico, Pittsfield, Salem, Sparta, Sullivan, Union, Vandalia, and Washington 159 AM CDT Fri Jul 17 2020 ...HEAT ADVISORY IN EFFECT FROM NOON SATURDAY TO 7 PM CDT SUNDAY... * WHAT...Heat index values of 105 to 110 expected. * WHERE...Portions of central, east central, northeast and southeast Missouri and south central, southwest and west central Illinois. * WHEN...Afternoon and early evening hours on Saturday and Sunday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ ILZ095-096-MOZ018-019-026-027-172200- /O.NEW.KLSX.HT.Y.0002.200718T1700Z-200719T0100Z/ Adams IL-Brown IL-Knox MO-Lewis MO-Marion MO-Shelby MO- Including the cities of Hannibal, Mount Sterling, and Quincy 159 AM CDT Fri Jul 17 2020 ...HEAT ADVISORY IN EFFECT FROM NOON TO 8 PM CDT SATURDAY... * WHAT...Heat index values of 105 expected. * WHERE...In Missouri, Knox MO, Lewis MO, Shelby MO and Marion MO Counties. In Illinois, Adams IL and Brown IL Counties. * WHEN...From noon to 8 PM CDT Saturday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ ILZ100>102-MOZ061-063>065-172200- /O.NEW.KLSX.HT.Y.0002.200718T1700Z-200720T0000Z/ Jefferson MO-Madison IL-Monroe IL-Saint Charles MO-Saint Clair IL- Saint Louis City MO-Saint Louis MO- Including the cities of Alton, Belleville, Cahokia, Edwardsville, Saint Charles, and Saint Louis 159 AM CDT Fri Jul 17 2020 ...HEAT ADVISORY IN EFFECT FROM NOON SATURDAY TO 7 PM CDT SUNDAY... * WHAT...Heat index values of 105 to 110 expected. * WHERE...The Greater St. Louis Metropolitan Area. * WHEN...Afternoon and early evening hours on Saturday and Sunday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. People in the Saint Louis Metropolitan Area can get information about cooling centers or energy assistance related to the excessive heat by calling the United Way of Greater Saint Louis at 800-427-4626, or if calling from a land line phone dial 2-1-1. You can also call Cool Down Saint Louis at 314-241-7668. && $$ CVKING
7 follow-up statements
089 WWUS73 KLSX 171955 NPWLSX URGENT - WEATHER MESSAGE National Weather Service Saint Louis MO 255 PM CDT Fri Jul 17 2020 ILZ058>060-064-065-069-070-074-079-097>099-MOZ034>036-041-042- 047>052-059-060-062-072>075-084-085-099-180800- /O.CON.KLSX.HT.Y.0002.200718T1700Z-200720T0000Z/ Audrain MO-Bond IL-Boone MO-Calhoun IL-Callaway MO-Clinton IL- Cole MO-Crawford MO-Fayette IL-Franklin MO-Gasconade MO-Greene IL- Iron MO-Jersey IL-Lincoln MO-Macoupin IL-Madison MO-Marion IL- Moniteau MO-Monroe MO-Montgomery IL-Montgomery MO-Osage MO- Pike IL-Pike MO-Ralls MO-Randolph IL-Reynolds MO- Saint Francois MO-Sainte Genevieve MO-Warren MO-Washington IL- Washington MO- Including the cities of Bowling Green, Centralia, Chester, Columbia, Farmington, Fulton, Jefferson City, Litchfield, Mexico, Pittsfield, Salem, Sparta, Sullivan, Union, Vandalia, and Washington 255 PM CDT Fri Jul 17 2020 ...HEAT ADVISORY REMAINS IN EFFECT FROM NOON SATURDAY TO 7 PM CDT SUNDAY... * WHAT...Heat index values of 105 to 110 expected. * WHERE...Portions of central, east central, northeast and southeast Missouri and south central, southwest and west central Illinois. * WHEN...Afternoon and early evening hours on Saturday and Sunday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ ILZ095-096-MOZ018-019-026-027-180800- /O.CON.KLSX.HT.Y.0002.200718T1700Z-200719T0100Z/ Adams IL-Brown IL-Knox MO-Lewis MO-Marion MO-Shelby MO- Including the cities of Hannibal, Mount Sterling, and Quincy 255 PM CDT Fri Jul 17 2020 ...HEAT ADVISORY REMAINS IN EFFECT FROM NOON TO 8 PM CDT SATURDAY... * WHAT...Heat index values of 105 expected. * WHERE...In Missouri, Knox MO, Lewis MO, Shelby MO and Marion MO Counties. In Illinois, Adams IL and Brown IL Counties. * WHEN...From noon to 8 PM CDT Saturday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ ILZ100>102-MOZ061-063>065-180800- /O.CON.KLSX.HT.Y.0002.200718T1700Z-200720T0000Z/ Jefferson MO-Madison IL-Monroe IL-Saint Charles MO-Saint Clair IL- Saint Louis City MO-Saint Louis MO- Including the cities of Alton, Belleville, Cahokia, Edwardsville, Saint Charles, and Saint Louis 255 PM CDT Fri Jul 17 2020 ...HEAT ADVISORY REMAINS IN EFFECT FROM NOON SATURDAY TO 7 PM CDT SUNDAY... * WHAT...Heat index values of 105 to 110 expected. * WHERE...The Greater St. Louis Metropolitan Area. * WHEN...Afternoon and early evening hours on Saturday and Sunday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. People in the Saint Louis Metropolitan Area can get information about cooling centers or energy assistance related to the excessive heat by calling the United Way of Greater Saint Louis at 800-427-4626, or if calling from a land line phone dial 2-1-1. You can also call Cool Down Saint Louis at 314-241-7668. && $$ Maples
943 WWUS73 KLSX 180738 NPWLSX URGENT - WEATHER MESSAGE National Weather Service Saint Louis MO 238 AM CDT Sat Jul 18 2020 ILZ058>060-064-065-069-070-074-079-097>099-MOZ034>036-041-042- 047>052-059-060-062-072>075-084-085-099-182100- /O.CON.KLSX.HT.Y.0002.200718T1700Z-200720T0000Z/ Audrain MO-Bond IL-Boone MO-Calhoun IL-Callaway MO-Clinton IL- Cole MO-Crawford MO-Fayette IL-Franklin MO-Gasconade MO-Greene IL- Iron MO-Jersey IL-Lincoln MO-Macoupin IL-Madison MO-Marion IL- Moniteau MO-Monroe MO-Montgomery IL-Montgomery MO-Osage MO- Pike IL-Pike MO-Ralls MO-Randolph IL-Reynolds MO- Saint Francois MO-Sainte Genevieve MO-Warren MO-Washington IL- Washington MO- Including the cities of Bowling Green, Centralia, Chester, Columbia, Farmington, Fulton, Jefferson City, Litchfield, Mexico, Pittsfield, Salem, Sparta, Sullivan, Union, Vandalia, and Washington 238 AM CDT Sat Jul 18 2020 ...HEAT ADVISORY REMAINS IN EFFECT FROM NOON TODAY TO 7 PM CDT SUNDAY... * WHAT...Heat index values of 105 to 110 expected. * WHERE...Portions of central, east central, northeast and southeast Missouri and south central, southwest and west central Illinois. * WHEN...Afternoon and early evening hours today and Sunday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ ILZ095-096-MOZ018-019-026-027-182100- /O.CON.KLSX.HT.Y.0002.200718T1700Z-200719T0100Z/ Adams IL-Brown IL-Knox MO-Lewis MO-Marion MO-Shelby MO- Including the cities of Hannibal, Mount Sterling, and Quincy 238 AM CDT Sat Jul 18 2020 ...HEAT ADVISORY REMAINS IN EFFECT FROM NOON TODAY TO 8 PM CDT THIS EVENING... * WHAT...Heat index values of 105 to 110 expected. * WHERE...In Missouri, Knox MO, Lewis MO, Shelby MO and Marion MO Counties. In Illinois, Adams IL and Brown IL Counties. * WHEN...From noon to 8 PM CDT today. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ ILZ100>102-MOZ061-063>065-182100- /O.CON.KLSX.HT.Y.0002.200718T1700Z-200720T0000Z/ Jefferson MO-Madison IL-Monroe IL-Saint Charles MO-Saint Clair IL- Saint Louis City MO-Saint Louis MO- Including the cities of Alton, Belleville, Cahokia, Edwardsville, Saint Charles, and Saint Louis 238 AM CDT Sat Jul 18 2020 ...HEAT ADVISORY REMAINS IN EFFECT FROM NOON TODAY TO 7 PM CDT SUNDAY... * WHAT...Heat index values of 105 to 110 expected. * WHERE...The Greater St. Louis Metropolitan Area. * WHEN...Afternoon and early evening hours today and Sunday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. People in the Saint Louis Metropolitan Area can get information about cooling centers or energy assistance related to the excessive heat by calling the United Way of Greater Saint Louis at 800-427-4626, or if calling from a land line phone dial 2-1-1. You can also call Cool Down Saint Louis at 314-241-7668. && $$ CVKING
053 WWUS73 KLSX 181935 NPWLSX URGENT - WEATHER MESSAGE National Weather Service Saint Louis MO 235 PM CDT Sat Jul 18 2020 ILZ058>060-064-065-069-070-074-079-097>099-MOZ034>036-041-042- 047>052-059-060-062-072>075-084-085-099-190745- /O.CON.KLSX.HT.Y.0002.000000T0000Z-200720T0000Z/ Audrain MO-Bond IL-Boone MO-Calhoun IL-Callaway MO-Clinton IL- Cole MO-Crawford MO-Fayette IL-Franklin MO-Gasconade MO-Greene IL- Iron MO-Jersey IL-Lincoln MO-Macoupin IL-Madison MO-Marion IL- Moniteau MO-Monroe MO-Montgomery IL-Montgomery MO-Osage MO- Pike IL-Pike MO-Ralls MO-Randolph IL-Reynolds MO- Saint Francois MO-Sainte Genevieve MO-Warren MO-Washington IL- Washington MO- Including the cities of Bowling Green, Centralia, Chester, Columbia, Farmington, Fulton, Jefferson City, Litchfield, Mexico, Pittsfield, Salem, Sparta, Sullivan, Union, Vandalia, and Washington 235 PM CDT Sat Jul 18 2020 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 7 PM CDT SUNDAY... * WHAT...Heat index values of 105 to 110 expected. * WHERE...Portions of central, east central, northeast and southeast Missouri and south central, southwest and west central Illinois. * WHEN...Until 7 PM CDT Sunday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ ILZ095-096-MOZ018-019-026-027-190100- /O.CON.KLSX.HT.Y.0002.000000T0000Z-200719T0100Z/ Adams IL-Brown IL-Knox MO-Lewis MO-Marion MO-Shelby MO- Including the cities of Hannibal, Mount Sterling, and Quincy 235 PM CDT Sat Jul 18 2020 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM CDT THIS EVENING... * WHAT...Heat index values of 105 to 110 expected. * WHERE...In Illinois, Adams IL and Brown IL Counties. In Missouri, Lewis MO, Knox MO, Shelby MO and Marion MO Counties. * WHEN...Until 8 PM CDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ ILZ100>102-MOZ061-063>065-190745- /O.CON.KLSX.HT.Y.0002.000000T0000Z-200720T0000Z/ Jefferson MO-Madison IL-Monroe IL-Saint Charles MO-Saint Clair IL- Saint Louis City MO-Saint Louis MO- Including the cities of Alton, Belleville, Cahokia, Edwardsville, Saint Charles, and Saint Louis 235 PM CDT Sat Jul 18 2020 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 7 PM CDT SUNDAY... * WHAT...Heat index values of 105 to 110 expected. * WHERE...In Missouri, Saint Charles MO, Saint Louis City MO, Jefferson MO and Saint Louis MO Counties. In Illinois, Saint Clair IL, Monroe IL and Madison IL Counties. * WHEN...Until 7 PM CDT Sunday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ Britt
948 WWUS73 KLSX 190055 NPWLSX URGENT - WEATHER MESSAGE National Weather Service Saint Louis MO 755 PM CDT Sat Jul 18 2020 ILZ095-096-MOZ018-019-026-027-190200- /O.EXP.KLSX.HT.Y.0002.000000T0000Z-200719T0100Z/ Adams IL-Brown IL-Knox MO-Lewis MO-Marion MO-Shelby MO- Including the cities of Hannibal, Mount Sterling, and Quincy 755 PM CDT Sat Jul 18 2020 ...HEAT ADVISORY WILL EXPIRE AT 8 PM CDT THIS EVENING... Peak heat index values are expected to be below 100 degrees for the next couple of days. $$ ILZ058>060-064-065-069-070-074-079-097>099-MOZ034>036-041-042- 047>052-059-060-062-072>075-084-085-099-191300- /O.CON.KLSX.HT.Y.0002.000000T0000Z-200720T0000Z/ Audrain MO-Bond IL-Boone MO-Calhoun IL-Callaway MO-Clinton IL- Cole MO-Crawford MO-Fayette IL-Franklin MO-Gasconade MO-Greene IL- Iron MO-Jersey IL-Lincoln MO-Macoupin IL-Madison MO-Marion IL- Moniteau MO-Monroe MO-Montgomery IL-Montgomery MO-Osage MO- Pike IL-Pike MO-Ralls MO-Randolph IL-Reynolds MO- Saint Francois MO-Sainte Genevieve MO-Warren MO-Washington IL- Washington MO- Including the cities of Bowling Green, Centralia, Chester, Columbia, Farmington, Fulton, Jefferson City, Litchfield, Mexico, Pittsfield, Salem, Sparta, Sullivan, Union, Vandalia, and Washington 755 PM CDT Sat Jul 18 2020 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 7 PM CDT SUNDAY... * WHAT...Heat index values around 105. * WHERE...Portions of central, east central, northeast and southeast Missouri and south central, southwest and west central Illinois. * WHEN...Until 7 PM CDT Sunday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ ILZ100>102-MOZ061-063>065-191300- /O.CON.KLSX.HT.Y.0002.000000T0000Z-200720T0000Z/ Jefferson MO-Madison IL-Monroe IL-Saint Charles MO-Saint Clair IL- Saint Louis City MO-Saint Louis MO- Including the cities of Alton, Belleville, Cahokia, Edwardsville, Saint Charles, and Saint Louis 755 PM CDT Sat Jul 18 2020 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 7 PM CDT SUNDAY... * WHAT...Heat index values from 105 to 110. * WHERE...In Missouri, Saint Charles MO, Saint Louis City MO, Jefferson MO and Saint Louis MO Counties. In Illinois, Saint Clair IL, Monroe IL and Madison IL Counties. * WHEN...Until 7 PM CDT Sunday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... People in the Saint Louis Metropolitan Area can get information about cooling centers or energy assistance related to the excessive heat by calling the United Way of Greater Saint Louis at 800-427-4626, or if calling from a land line phone dial 2-1-1. You can also call Cool Down Saint Louis at 314-241-7668. Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ TES
536 WWUS73 KLSX 190805 NPWLSX URGENT - WEATHER MESSAGE National Weather Service Saint Louis MO 305 AM CDT Sun Jul 19 2020 ILZ058>060-064-065-069-070-074-079-097>099-MOZ034>036-041-042- 047>052-059-060-062-072>075-084-085-099-192100- /O.CON.KLSX.HT.Y.0002.000000T0000Z-200720T0000Z/ Audrain MO-Bond IL-Boone MO-Calhoun IL-Callaway MO-Clinton IL- Cole MO-Crawford MO-Fayette IL-Franklin MO-Gasconade MO-Greene IL- Iron MO-Jersey IL-Lincoln MO-Macoupin IL-Madison MO-Marion IL- Moniteau MO-Monroe MO-Montgomery IL-Montgomery MO-Osage MO- Pike IL-Pike MO-Ralls MO-Randolph IL-Reynolds MO- Saint Francois MO-Sainte Genevieve MO-Warren MO-Washington IL- Washington MO- Including the cities of Bowling Green, Centralia, Chester, Columbia, Farmington, Fulton, Jefferson City, Litchfield, Mexico, Pittsfield, Salem, Sparta, Sullivan, Union, Vandalia, and Washington 305 AM CDT Sun Jul 19 2020 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 7 PM CDT THIS EVENING... * WHAT...Heat index values of 105 to 110. * WHERE...Portions of central, east central, northeast and southeast Missouri and south central, southwest and west central Illinois. * WHEN...This afternoon and early this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ ILZ100>102-MOZ061-063>065-192100- /O.CON.KLSX.HT.Y.0002.000000T0000Z-200720T0000Z/ Jefferson MO-Madison IL-Monroe IL-Saint Charles MO-Saint Clair IL- Saint Louis City MO-Saint Louis MO- Including the cities of Alton, Belleville, Cahokia, Edwardsville, Saint Charles, and Saint Louis 305 AM CDT Sun Jul 19 2020 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 7 PM CDT THIS EVENING... * WHAT...Heat index values from 105 to 110. * WHERE...In Missouri, Saint Charles MO, Saint Louis City MO, Jefferson MO and Saint Louis MO Counties. In Illinois, Saint Clair IL, Monroe IL and Madison IL Counties. * WHEN...This afternoon and evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... People in the Saint Louis Metropolitan Area can get information about cooling centers or energy assistance related to the excessive heat by calling the United Way of Greater Saint Louis at 800-427-4626, or if calling from a land line phone dial 2-1-1. You can also call Cool Down Saint Louis at 314-241-7668. Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. && $$ CVKING
336 WWUS73 KLSX 191924 NPWLSX URGENT - WEATHER MESSAGE National Weather Service Saint Louis MO 224 PM CDT Sun Jul 19 2020 ILZ058>060-064-065-069-070-074-079-097>099-MOZ034>036-041-042- 047>052-059-060-062-072>075-084-085-099-200000- /O.CON.KLSX.HT.Y.0002.000000T0000Z-200720T0000Z/ Audrain MO-Bond IL-Boone MO-Calhoun IL-Callaway MO-Clinton IL- Cole MO-Crawford MO-Fayette IL-Franklin MO-Gasconade MO-Greene IL- Iron MO-Jersey IL-Lincoln MO-Macoupin IL-Madison MO-Marion IL- Moniteau MO-Monroe MO-Montgomery IL-Montgomery MO-Osage MO- Pike IL-Pike MO-Ralls MO-Randolph IL-Reynolds MO- Saint Francois MO-Sainte Genevieve MO-Warren MO-Washington IL- Washington MO- Including the cities of Bowling Green, Centralia, Chester, Columbia, Farmington, Fulton, Jefferson City, Litchfield, Mexico, Pittsfield, Salem, Sparta, Sullivan, Union, Vandalia, and Washington 224 PM CDT Sun Jul 19 2020 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 7 PM CDT THIS EVENING... * WHAT...Heat index values around 105 degrees. * WHERE...Portions of central, east central, northeast and southeast Missouri and south central, southwest and west central Illinois. * WHEN...Until 7 PM CDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ ILZ100>102-MOZ061-063>065-200000- /O.CON.KLSX.HT.Y.0002.000000T0000Z-200720T0000Z/ Jefferson MO-Madison IL-Monroe IL-Saint Charles MO-Saint Clair IL- Saint Louis City MO-Saint Louis MO- Including the cities of Alton, Belleville, Cahokia, Edwardsville, Saint Charles, and Saint Louis 224 PM CDT Sun Jul 19 2020 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 7 PM CDT THIS EVENING... * WHAT...Heat index values around 105 degrees. * WHERE...In Missouri, Saint Charles MO, Saint Louis City MO, Jefferson MO and Saint Louis MO Counties. In Illinois, Saint Clair IL, Monroe IL and Madison IL Counties. * WHEN...Until 7 PM CDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ Britt
022 WWUS73 KLSX 200007 NPWLSX URGENT - WEATHER MESSAGE National Weather Service Saint Louis MO 707 PM CDT Sun Jul 19 2020 ILZ058>060-064-065-069-070-074-079-097>102-MOZ034>036-041-042- 047>052-059>065-072>075-084-085-099-200115- /O.EXP.KLSX.HT.Y.0002.000000T0000Z-200720T0000Z/ Audrain MO-Bond IL-Boone MO-Calhoun IL-Callaway MO-Clinton IL- Cole MO-Crawford MO-Fayette IL-Franklin MO-Gasconade MO-Greene IL- Iron MO-Jefferson MO-Jersey IL-Lincoln MO-Macoupin IL-Madison IL- Madison MO-Marion IL-Moniteau MO-Monroe IL-Monroe MO- Montgomery IL-Montgomery MO-Osage MO-Pike IL-Pike MO-Ralls MO- Randolph IL-Reynolds MO-Saint Charles MO-Saint Clair IL- Saint Francois MO-Saint Louis City MO-Saint Louis MO- Sainte Genevieve MO-Warren MO-Washington IL-Washington MO- Including the cities of Alton, Belleville, Bowling Green, Cahokia, Centralia, Chester, Columbia, Edwardsville, Farmington, Fulton, Jefferson City, Litchfield, Mexico, Pittsfield, Saint Charles, Saint Louis, Salem, Sparta, Sullivan, Union, Vandalia, and Washington 707 PM CDT Sun Jul 19 2020 ...HEAT ADVISORY HAS EXPIRED... The heat advisory has been allowed to expire as temperatures gradually cool early this evening with heat indices now below 105. $$ GKS
What forecasters said that day
The local office's own words before this heat advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS St. Louis, MO wrote its last area forecast discussion before this heat advisory went out at Jul 16, 10:33 PM CDT, 3 hours 26 minutes earlier.
Area forecast discussion, Jul 16, 10:33 PM CDT, 3 hours 26 minutes before
Area Forecast Discussion...Updated Aviation National Weather Service Saint Louis MO 1033 PM CDT Thu Jul 16 2020 .SHORT TERM... (Through Late Friday Night) Issued at 258 PM CDT Thu Jul 16 2020 Following today's modest reprieve from hot and humid conditions will be a return to the sultry summer air mass Friday. The certainty revolving around Friday afternoon heat indices is only somewhat stunted by the struggle to pinpoint details with regard to a stalled boundary and resulting thunderstorm potential. Issues are minor through late tonight. Surface high pressure will gradually move east through Friday morning. Surface flow turns southwest with increasing low to mid-level moisture behind the departing high. Where light winds intersect with better surface moisture (recent rainfall) over southeast Missouri and portions of southwest Illinois, we could see a brief period of patchy fog in the pre-dawn hours Friday morning. There are two features to watch overnight. One is another compact vort feature that tracks west to east along the Kansas/Oklahoma border late today and through southern Missouri through the first half of Friday. This will likely assist the stalled boundary in additional thunderstorm development over southern Missouri. Hi-res guidance continues to point to a slight northward shift in the boundary, which become quite difuse Friday afternoon. Isolated to perhaps scattered storms are possible over the southern sections of the forecast area, potentially reaching as far north as St. Louis by early afternoon. The second feature is another small vort that track from Nebraska into southern Iowa Friday afternoon. There are some hints that a weak area of convergence extends south of this and results in isolated storms over central Missouri. Therefore, maintained slight chances for isolated thundertorms at the height of diurnal instability. Though moisture and temperatures increase Friday, apparent temperatures above 100 degrees look more probable from central Missouri through southeast Missouri. Given the lingering question with the position of the boundary and/or resulting impacts from thunderstorms, there still isn't enough confidence to say definitively that heat indices will achieve the one day criteria. It's more likely that duration criteria will be met, provided lack of thunderstorm development and persistence in Saturday-Monday temperatures trends. Maples .LONG TERM... (Saturday through Next Thursday) Issued at 258 PM CDT Thu Jul 16 2020 Heat remains the primary concern through the weekend and potentially into early next week. However, the struggles continue with regard to nailing down the magnitude and locations impacted by higher heat indices, largely due to thunderstorms potential and timing in a cold front next week. Consequently, there are some reservations and lower confidence in the duration of the upcoming warmth. It continues to look as though the upper ridge will extend from the southwest CONUS, east through the mid-Atlantic seaboard Saturday. However, the strength of the H5 ridge is somewhat offset east of the Mississippi Valley with surface high pressure and mid-level height rises from west to east through the southeastern CONUS. An upper trough begins to enter the northern plains Saturday with several vort features ejecting east in the Upper Midwest from the base of the trough. An increasing pressure gradient begins to develop in the mid-levels with a strengthening jet stretching from the central plains into the northern Great Lakes. As the upper trough moves east through the weekend, a surface cold front begins to sink southward. We lie squarely in between, where a remnant vort from the central plains continues to be relatively stagnant over a diffuse stationary boundary. Guidance continues be quite variable in the degree of diurnal activity along and north of the this boundary as is slowly drift north Saturday and Sunday. As this is all occurring, disturbances to the north provide some potential for MCS development around the northern periphery of the upper ridge. At this point, concerns for heat still exist with the caveat that isolated to scattered storms could develop either day. The greatest bust potential would stem from any southward placement in MCS development out of the north. Therefore, there is still far too much uncertainty for any headline call. Current forecasts in the mid to upper 90s are between the upper 50th and 75th percentile from Friday through Monday. By early next week, trends are showing a southward push to the cold front and thunderstorm potential, which should effectively end the concern for higher heat indices. It's beginning to look a bit more active early next week. Maples && .AVIATION... (For the 06z TAFs through 06z Friday Night) Issued at 1033 PM CDT Thu Jul 16 2020 VFR conditions, dry weather, and light surface winds of less than 10kts will prevail at the TAF sites through the valid period. There is a low chance (20%) of thunderstorms Friday afternoon but too low to mention at this time. Otherwise, look for E-SE surface winds to gradually veer more S-SE during the valid period with the potential for brief periods of VSBY reductions in fog mainly at KCPS later tonight. TES && .LSX WATCHES/WARNINGS/ADVISORIES... MO...None. IL...None. && WFO LSX
Hazardous weather outlook, Jul 16, 8:27 PM CDT, 5 hours 32 minutes before
Hazardous Weather Outlook National Weather Service Saint Louis MO 827 PM CDT Thu Jul 16 2020 ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027- 034>036-041-042-047>052-059>065-072>075-084-085-099-180200- Adams IL-Audrain MO-Bond IL-Boone MO-Brown IL-Calhoun IL-Callaway MO- Clinton IL-Cole MO-Crawford MO-Fayette IL-Franklin MO-Gasconade MO- Greene IL-Iron MO-Jefferson MO-Jersey IL-Knox MO-Lewis MO-Lincoln MO- Macoupin IL-Madison IL-Madison MO-Marion IL-Marion MO-Moniteau MO- Monroe IL-Monroe MO-Montgomery IL-Montgomery MO-Osage MO-Pike IL- Pike MO-Ralls MO-Randolph IL-Reynolds MO-Saint Charles MO- Saint Clair IL-Saint Francois MO-Saint Louis City MO-Saint Louis MO- Sainte Genevieve MO-Shelby MO-Warren MO-Washington IL-Washington MO- 827 PM CDT Thu Jul 16 2020 This Hazardous Weather Outlook is for portions of eastern and central Missouri as well as west central and southwest Illinois. .DAY ONE...Tonight. There is a slight chance for thunderstorms in portions of southeast Missouri. Severe storm probabilities are low. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. A prolonged and dangerous heat wave is possible for much of the area Friday through Monday, when heat index values each afternoon and early evening will peak between 100 and 110 degrees. The most oppressive conditions are expected on Saturday and Sunday. There is a chance for thunderstorms over parts of the area each day. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated tonight. TES
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 17, 2:46 PM CDT | Areal Flood Advisory | LSX | Iron, Madison, Reynolds, Saint Francois, Washington | 3 hr |
| Jul 17, 4:06 PM CDT | Areal Flood Advisory | LSX | Saint Charles, Saint Louis, City of Saint Louis | 3 hr |
| Jul 17, 5:19 PM CDT | Flash Flood Warning | LSX | Saint Charles, Saint Louis, City of Saint Louis | 3 hr |
Nearby
Heat Advisories in Missouri, 2020Heat Advisories in Illinois, 2020Every heat advisory in 2020
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.