Alert archive / Missouri / Winter Weather Advisories in 2021
Winter Weather Advisory 9, NWS St. Louis, MO
NWS St. Louis, MO issued this winter weather advisory at Feb 5, 2021, 2:19 PM CST for 14 counties in Illinois; 24 counties in Missouri. It took effect at Feb 6, 2021, 12:00 PM CST. It was in force for 9 hr.
The area
The counties it named.
The facts
- Issued
- Feb 5, 2021, 2:19 PM CST (20:19 UTC)
- In effect from
- Feb 6, 2021, 12:00 PM CST
- Expired
- Feb 6, 2021, 9:00 PM CST
- In force
- 9 hr
- Issued by
- NWS St. Louis, MO
All 38 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, Monroe County, IL, Montgomery County, IL, Pike County, IL, Saint Clair 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, Jefferson County, MO, Knox County, MO, Lewis County, MO, Lincoln County, MO, Marion County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Osage County, MO, Pike County, MO, Ralls County, MO, Saint Charles County, MO, Saint Louis County, MO, Shelby County, MO, Warren County, MO, Washington County, MO
The radar
The St Louis radar (KLSX), 43 km from the middle of the area, began a volume at 20:19 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, 8.3 hours before the alert went out and 239 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
- 834 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 55 m²/s²
- 0-3 km storm-relative helicity
- 36 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
110 WWUS43 KLSX 052019 WSWLSX URGENT - WINTER WEATHER MESSAGE National Weather Service Saint Louis MO 219 PM CST Fri Feb 5 2021 ILZ058>060-095>099-MOZ018-019-026-027-034>036-041-042-047>052-059- 060-070300- /O.NEW.KLSX.WW.Y.0009.210206T1500Z-210207T0300Z/ Adams IL-Audrain MO-Boone MO-Brown IL-Calhoun IL-Callaway MO- Cole MO-Gasconade MO-Greene IL-Jersey IL-Knox MO-Lewis MO- Lincoln MO-Macoupin IL-Marion MO-Moniteau MO-Monroe MO- Montgomery IL-Montgomery MO-Osage MO-Pike IL-Pike MO-Ralls MO- Shelby MO-Warren MO- Including the cities of Bowling Green, Columbia, Fulton, Hannibal, Jefferson City, Litchfield, Mexico, Mount Sterling, Pittsfield, and Quincy 219 PM CST Fri Feb 5 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM 9 AM TO 9 PM CST SATURDAY... * WHAT...Snow expected. Total snow accumulations of 2 to 4 inches. * WHERE...Portions of central, east central and northeast Missouri and south central, southwest and west central Illinois. * WHEN...From 9 AM to 9 PM CST Saturday. * IMPACTS...Plan on slippery road conditions. Reduced visibility expected where snowfall rates are higher. * ADDITIONAL DETAILS...Very cold air is expected along with and behind the snow, which will cause a drop in wind chills and may present travel concerns on untreated roadways. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means that periods of accumulating snow will primarily cause travel difficulties. Roads may rapidly become slippery once the snow begins, so motorists should plan for a slower than normal trip. Be especially alert when approaching bridges, overpasses, and curves. In Illinois, the latest road conditions can be obtained on the Internet at www.gettingaroundillinois.com. In Missouri, the latest road conditions can be obtained on the Internet at traveler.modot.org/map/ or by calling 1-888-275-6636. && $$ MRB
5 follow-up statements
423 WWUS43 KLSX 061027 WSWLSX URGENT - WINTER WEATHER MESSAGE National Weather Service Saint Louis MO 427 AM CST Sat Feb 6 2021 ILZ095-096-MOZ018-019-026-027-062200- /O.NEW.KLSX.WC.Y.0001.210207T0600Z-210207T1700Z/ /O.EXT.KLSX.WW.Y.0009.210206T1800Z-210207T0300Z/ Adams IL-Brown IL-Knox MO-Lewis MO-Marion MO-Shelby MO- Including the cities of Hannibal, Mount Sterling, and Quincy 427 AM CST Sat Feb 6 2021 ...WINTER WEATHER ADVISORY NOW IN EFFECT FROM NOON TODAY TO 9 PM CST THIS EVENING... ...WIND CHILL ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 11 AM CST SUNDAY... * WHAT...For the Winter Weather Advisory, snow expected. Total snow accumulations of 2 to 3 inches. For the Wind Chill Advisory, very cold wind chills expected. Wind chills as low as 20 below zero. * WHERE...Portions of northeast Missouri and west central Illinois. * WHEN...For the Winter Weather Advisory, from noon today to 9 PM CST this evening. For the Wind Chill Advisory, from midnight tonight to 11 AM CST Sunday. * IMPACTS...Plan on slippery road conditions. The cold wind chills could cause frostbite on exposed skin in as little as 30 minutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means that periods of accumulating snow will primarily cause travel difficulties. Roads may rapidly become slippery once the snow begins, so motorists should plan for a slower than normal trip. Be especially alert when approaching bridges, overpasses, and curves. A Wind Chill Advisory means that very cold air and strong winds will combine to generate low wind chill values. This will result in frost bite and lead to hypothermia if precautions are not taken. If you must venture outdoors, make sure you wear a hat and gloves, making sure all exposed skin is covered. In Illinois, the latest road conditions can be obtained on the Internet at www.gettingaroundillinois.com. In Missouri, the latest road conditions can be obtained on the Internet at traveler.modot.org/map/ or by calling 1-888-275-6636. && $$ ILZ064-065-069-100>102-MOZ061>065-072-073-062200- /O.EXB.KLSX.WW.Y.0009.210206T1800Z-210207T0300Z/ Bond IL-Clinton IL-Crawford MO-Fayette IL-Franklin MO- Jefferson MO-Madison IL-Monroe IL-Saint Charles MO-Saint Clair- Saint Louis City MO-Saint Louis MO-Washington MO- Including the cities of Alton, Belleville, Cahokia, Edwardsville, Saint Charles, Saint Louis, Sullivan, Union, Vandalia, and Washington 427 AM CST Sat Feb 6 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM NOON TODAY TO 9 PM CST THIS EVENING... * WHAT...Snow expected. Total snow accumulations of 1 to 3 inches. * WHERE...Portions of east central Missouri and southwest Illinois. * WHEN...From noon today to 9 PM CST this evening. * IMPACTS...Plan on slippery road conditions. Reduced visibility expected where snowfall rates are higher. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means that periods of accumulating snow will primarily cause travel difficulties. Roads may rapidly become slippery once the snow begins, so motorists should plan for a slower than normal trip. Be especially alert when approaching bridges, overpasses, and curves. In Illinois, the latest road conditions can be obtained on the Internet at www.gettingaroundillinois.com. In Missouri, the latest road conditions can be obtained on the Internet at traveler.modot.org/map/ or by calling 1-888-275-6636. && $$ ILZ058>060-097>099-MOZ034>036-041-042-047>052-059-060-062200- /O.EXT.KLSX.WW.Y.0009.210206T1800Z-210207T0300Z/ Audrain MO-Boone MO-Calhoun IL-Callaway MO-Cole MO-Gasconade MO- Greene IL-Jersey IL-Lincoln MO-Macoupin IL-Moniteau MO-Monroe MO- Montgomery IL-Montgomery MO-Osage MO-Pike IL-Pike MO-Ralls MO- Warren MO- Including the cities of Bowling Green, Columbia, Fulton, Jefferson City, Litchfield, Mexico, and Pittsfield 427 AM CST Sat Feb 6 2021 ...WINTER WEATHER ADVISORY NOW IN EFFECT FROM NOON TODAY TO 9 PM CST THIS EVENING... * WHAT...Snow expected. Total snow accumulations of 2 to 4 inches. * WHERE...Portions of central and northeast Missouri and southwest and west central Illinois. * WHEN...From noon today to 9 PM CST this evening. * IMPACTS...Plan on slippery road conditions. Reduced visibility expected where snowfall rates are higher. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means that periods of accumulating snow will primarily cause travel difficulties. Roads may rapidly become slippery once the snow begins, so motorists should plan for a slower than normal trip. Be especially alert when approaching bridges, overpasses, and curves. In Illinois, the latest road conditions can be obtained on the Internet at www.gettingaroundillinois.com. In Missouri, the latest road conditions can be obtained on the Internet at traveler.modot.org/map/ or by calling 1-888-275-6636. && $$ GKS
370 WWUS43 KLSX 062007 WSWLSX URGENT - WINTER WEATHER MESSAGE National Weather Service Saint Louis MO 207 PM CST Sat Feb 6 2021 ILZ058>060-097-MOZ034>036-071100- /O.EXB.KLSX.WC.Y.0001.210207T0600Z-210207T1800Z/ /O.CON.KLSX.WW.Y.0009.000000T0000Z-210207T0300Z/ Greene IL-Macoupin IL-Monroe MO-Montgomery IL-Pike IL-Pike MO- Ralls MO- Including the cities of Bowling Green, Litchfield, and Pittsfield 207 PM CST Sat Feb 6 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 PM CST THIS EVENING... ...WIND CHILL ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO NOON CST SUNDAY... * WHAT...For the Winter Weather Advisory, snow. Additional snow accumulations of one to two inches. For the Wind Chill Advisory, very cold wind chills expected. Wind chills as low as 20 below zero. * WHERE...Portions of northeast Missouri and south central, southwest and west central Illinois. * WHEN...For the Winter Weather Advisory, until 9 PM CST this evening. For the Wind Chill Advisory, from midnight tonight to noon CST Sunday. * IMPACTS...Plan on slippery road conditions. The cold wind chills could cause frostbite on exposed skin in as little as 30 minutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means that periods of accumulating snow will primarily cause travel difficulties. Roads may rapidly become slippery once the snow begins, so motorists should plan for a slower than normal trip. Be especially alert when approaching bridges, overpasses, and curves. A Wind Chill Advisory means that very cold air and strong winds will combine to generate low wind chill values. This will result in frost bite and lead to hypothermia if precautions are not taken. If you must venture outdoors, make sure you wear a hat and gloves, making sure all exposed skin is covered. In Illinois, the latest road conditions can be obtained on the Internet at www.gettingaroundillinois.com. In Missouri, the latest road conditions can be obtained on the Internet at traveler.modot.org/map/ or by calling 1-888-275-6636. && $$ ILZ095-096-MOZ018-019-026-027-071100- /O.EXT.KLSX.WC.Y.0001.210207T0600Z-210207T1800Z/ /O.CON.KLSX.WW.Y.0009.000000T0000Z-210207T0300Z/ Adams IL-Brown IL-Knox MO-Lewis MO-Marion MO-Shelby MO- Including the cities of Hannibal, Mount Sterling, and Quincy 207 PM CST Sat Feb 6 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 PM CST THIS EVENING... ...WIND CHILL ADVISORY NOW IN EFFECT FROM MIDNIGHT TONIGHT TO NOON CST SUNDAY... * WHAT...For the Winter Weather Advisory, snow. Additional snow accumulations of one to two inches. For the Wind Chill Advisory, very cold wind chills expected. Wind chills as low as 20 below zero. * WHERE...Portions of northeast Missouri and west central Illinois. * WHEN...For the Winter Weather Advisory, until 9 PM CST this evening. For the Wind Chill Advisory, from midnight tonight to noon CST Sunday. * IMPACTS...Plan on slippery road conditions. The cold wind chills could cause frostbite on exposed skin in as little as 30 minutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means that periods of accumulating snow will primarily cause travel difficulties. Roads may rapidly become slippery once the snow begins, so motorists should plan for a slower than normal trip. Be especially alert when approaching bridges, overpasses, and curves. A Wind Chill Advisory means that very cold air and strong winds will combine to generate low wind chill values. This will result in frost bite and lead to hypothermia if precautions are not taken. If you must venture outdoors, make sure you wear a hat and gloves, making sure all exposed skin is covered. In Illinois, the latest road conditions can be obtained on the Internet at www.gettingaroundillinois.com. In Missouri, the latest road conditions can be obtained on the Internet at traveler.modot.org/map/ or by calling 1-888-275-6636. && $$ ILZ064-065-069-098>102-MOZ041-042-047>052-059>065-072-073-070300- /O.CON.KLSX.WW.Y.0009.000000T0000Z-210207T0300Z/ Audrain MO-Bond IL-Boone MO-Calhoun IL-Callaway MO-Clinton IL- Cole MO-Crawford MO-Fayette IL-Franklin MO-Gasconade MO- Jefferson MO-Jersey IL-Lincoln MO-Madison IL-Moniteau MO- Monroe IL-Montgomery MO-Osage MO-Saint Charles MO-Saint Clair- Saint Louis City MO-Saint Louis MO-Warren MO-Washington MO- Including the cities of Alton, Belleville, Cahokia, Columbia, Edwardsville, Fulton, Jefferson City, Mexico, Saint Charles, Saint Louis, Sullivan, Union, Vandalia, and Washington 207 PM CST Sat Feb 6 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 PM CST THIS EVENING... * WHAT...Snow. Additional snow accumulations of up to two inches. * WHERE...Portions of central and east central Missouri and south central and southwest Illinois. * WHEN...Until 9 PM CST this evening. * IMPACTS...Plan on slippery road conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means that periods of accumulating snow will primarily cause travel difficulties. Roads may rapidly become slippery once the snow begins, so motorists should plan for a slower than normal trip. Be especially alert when approaching bridges, overpasses, and curves. In Illinois, the latest road conditions can be obtained on the Internet at www.gettingaroundillinois.com. In Missouri, the latest road conditions can be obtained on the Internet at traveler.modot.org/map/ or by calling 1-888-275-6636. && $$ TES
034 WWUS43 KLSX 070105 WSWLSX URGENT - WINTER WEATHER MESSAGE National Weather Service Saint Louis MO 705 PM CST Sat Feb 6 2021 ILZ095-096-MOZ018-019-026-027-034-035-071315- /O.CAN.KLSX.WW.Y.0009.000000T0000Z-210207T0300Z/ /O.CON.KLSX.WC.Y.0001.210207T0600Z-210207T1800Z/ Adams IL-Brown IL-Knox MO-Lewis MO-Marion MO-Monroe MO-Ralls MO- Shelby MO- Including the cities of Hannibal, Mount Sterling, and Quincy 705 PM CST Sat Feb 6 2021 ...WIND CHILL ADVISORY REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO NOON CST SUNDAY... ...WINTER WEATHER ADVISORY IS CANCELLED... * WHAT...Very cold wind chills expected. Wind chills as low as 20 below zero. * WHERE...Portions of northeast Missouri and west central Illinois. * WHEN...From midnight tonight to noon CST Sunday. * IMPACTS...The cold wind chills could cause frostbite on exposed skin in as little as 30 minutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Wind Chill Advisory means that very cold air and strong winds will combine to generate low wind chill values. This will result in frost bite and lead to hypothermia if precautions are not taken. If you must venture outdoors, make sure you wear a hat and gloves, making sure all exposed skin is covered. && $$ MOZ041-042-047-070215- /O.CAN.KLSX.WW.Y.0009.000000T0000Z-210207T0300Z/ Audrain MO-Boone MO-Moniteau MO- Including the cities of Columbia and Mexico 705 PM CST Sat Feb 6 2021 ...WINTER WEATHER ADVISORY IS CANCELLED... Accumulating snow has ended or will be ending shortly across the area. Therefore the Winter Weather Advisory is cancelled. $$ ILZ058>060-097-MOZ036-071315- /O.CON.KLSX.WW.Y.0009.000000T0000Z-210207T0300Z/ /O.CON.KLSX.WC.Y.0001.210207T0600Z-210207T1800Z/ Greene IL-Macoupin IL-Montgomery IL-Pike IL-Pike MO- Including the cities of Bowling Green, Litchfield, and Pittsfield 705 PM CST Sat Feb 6 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 PM CST THIS EVENING... ...WIND CHILL ADVISORY REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO NOON CST SUNDAY... * WHAT...For the Winter Weather Advisory, snow. Additional snow accumulations of up to one inch. For the Wind Chill Advisory, very cold wind chills expected. Wind chills as low as 15 below zero. * WHERE...In Illinois, Montgomery IL, Pike IL, Greene IL and Macoupin IL Counties. In Missouri, Pike MO County. * WHEN...For the Winter Weather Advisory, until 9 PM CST this evening. For the Wind Chill Advisory, from midnight tonight to noon CST Sunday. * IMPACTS...Plan on slippery road conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means that periods of accumulating snow will primarily cause travel difficulties. Roads may rapidly become slippery once the snow begins, so motorists should plan for a slower than normal trip. Be especially alert when approaching bridges, overpasses, and curves. A Wind Chill Advisory means that very cold air and strong winds will combine to generate low wind chill values. This will result in frost bite and lead to hypothermia if precautions are not taken. If you must venture outdoors, make sure you wear a hat and gloves, making sure all exposed skin is covered. In Illinois, the latest road conditions can be obtained on the Internet at www.gettingaroundillinois.com. In Missouri, the latest road conditions can be obtained on the Internet at traveler.modot.org/map/ or by calling 1-888-275-6636. && $$ ILZ064-065-069-098>102-MOZ048>052-059>065-072-073-070300- /O.CON.KLSX.WW.Y.0009.000000T0000Z-210207T0300Z/ Bond IL-Calhoun IL-Callaway MO-Clinton IL-Cole MO-Crawford MO- Fayette IL-Franklin MO-Gasconade MO-Jefferson MO-Jersey IL- Lincoln MO-Madison IL-Monroe IL-Montgomery MO-Osage MO- Saint Charles MO-Saint Clair-Saint Louis City MO-Saint Louis MO- Warren MO-Washington MO- Including the cities of Alton, Belleville, Cahokia, Edwardsville, Fulton, Jefferson City, Saint Charles, Saint Louis, Sullivan, Union, Vandalia, and Washington 705 PM CST Sat Feb 6 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 PM CST THIS EVENING... * WHAT...Snow. Additional snow accumulations of up to one inch. * WHERE...Portions of central and east central Missouri and south central and southwest Illinois. * WHEN...Until 9 PM CST this evening. * IMPACTS...Plan on slippery road conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means that periods of accumulating snow will primarily cause travel difficulties. Roads may rapidly become slippery once the snow begins, so motorists should plan for a slower than normal trip. Be especially alert when approaching bridges, overpasses, and curves. In Illinois, the latest road conditions can be obtained on the Internet at www.gettingaroundillinois.com. In Missouri, the latest road conditions can be obtained on the Internet at traveler.modot.org/map/ or by calling 1-888-275-6636. && $$ Carney
360 WWUS43 KLSX 070225 WSWLSX URGENT - WINTER WEATHER MESSAGE National Weather Service Saint Louis MO 825 PM CST Sat Feb 6 2021 ILZ097-MOZ036-071430- /O.CAN.KLSX.WW.Y.0009.000000T0000Z-210207T0300Z/ /O.CON.KLSX.WC.Y.0001.210207T0600Z-210207T1800Z/ Pike IL-Pike MO- Including the cities of Bowling Green and Pittsfield 825 PM CST Sat Feb 6 2021 ...WIND CHILL ADVISORY REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO NOON CST SUNDAY... ...WINTER WEATHER ADVISORY IS CANCELLED... * WHAT...Very cold wind chills expected. Wind chills as low as 15 below zero. * WHERE...In Illinois, Pike IL County. In Missouri, Pike MO County. * WHEN...From midnight tonight to noon CST Sunday. * IMPACTS...The cold wind chills could result in hypothermia if precautions are not taken. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Wind Chill Advisory means that very cold air and strong winds will combine to generate low wind chill values. This will result in frost bite and lead to hypothermia if precautions are not taken. If you must venture outdoors, make sure you wear a hat and gloves, making sure all exposed skin is covered. && $$ MOZ048>051-070330- /O.CAN.KLSX.WW.Y.0009.000000T0000Z-210207T0300Z/ Callaway MO-Cole MO-Montgomery MO-Osage MO- Including the cities of Fulton and Jefferson City 825 PM CST Sat Feb 6 2021 ...WINTER WEATHER ADVISORY IS CANCELLED... Accumulating snow has ended or will be ending shortly. Therefore the Winter Weather Advisory is cancelled. $$ ILZ058>060-071430- /O.CON.KLSX.WW.Y.0009.000000T0000Z-210207T0300Z/ /O.CON.KLSX.WC.Y.0001.210207T0600Z-210207T1800Z/ Greene IL-Macoupin IL-Montgomery IL- Including the city of Litchfield 825 PM CST Sat Feb 6 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 PM CST THIS EVENING... ...WIND CHILL ADVISORY REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO NOON CST SUNDAY... * WHAT...For the Winter Weather Advisory, snow. Snow accumulations of up to one inch. For the Wind Chill Advisory, very cold wind chills expected. Wind chills as low as 15 below zero. * WHERE...Montgomery IL, Greene IL and Macoupin IL Counties. * WHEN...For the Winter Weather Advisory, until 9 PM CST this evening. For the Wind Chill Advisory, from midnight tonight to noon CST Sunday. * IMPACTS...Plan on slippery road conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means that periods of accumulating snow will primarily cause travel difficulties. Roads may rapidly become slippery once the snow begins, so motorists should plan for a slower than normal trip. Be especially alert when approaching bridges, overpasses, and curves. A Wind Chill Advisory means that very cold air and strong winds will combine to generate low wind chill values. This will result in frost bite and lead to hypothermia if precautions are not taken. If you must venture outdoors, make sure you wear a hat and gloves, making sure all exposed skin is covered. The latest road conditions can be obtained on the Internet at www.gettingaroundillinois.com. && $$ ILZ064-065-069-098>102-MOZ052-059>065-072-073-070330- /O.CON.KLSX.WW.Y.0009.000000T0000Z-210207T0300Z/ Bond IL-Calhoun IL-Clinton IL-Crawford MO-Fayette IL-Franklin MO- Gasconade MO-Jefferson MO-Jersey IL-Lincoln MO-Madison IL- Monroe IL-Saint Charles MO-Saint Clair-Saint Louis City MO- Saint Louis MO-Warren MO-Washington MO- Including the cities of Alton, Belleville, Cahokia, Edwardsville, Saint Charles, Saint Louis, Sullivan, Union, Vandalia, and Washington 825 PM CST Sat Feb 6 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 PM CST THIS EVENING... * WHAT...Snow. Snow accumulations of up to one inch. * WHERE...Portions of east central Missouri and south central and southwest Illinois. * WHEN...Until 9 PM CST this evening. * IMPACTS...Plan on slippery road conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means that periods of accumulating snow will primarily cause travel difficulties. Roads may rapidly become slippery once the snow begins, so motorists should plan for a slower than normal trip. Be especially alert when approaching bridges, overpasses, and curves. In Illinois, the latest road conditions can be obtained on the Internet at www.gettingaroundillinois.com. In Missouri, the latest road conditions can be obtained on the Internet at traveler.modot.org/map/ or by calling 1-888-275-6636. && $$ ILZ095-096-MOZ018-019-026-027-034-035-071430- /O.CON.KLSX.WC.Y.0001.210207T0600Z-210207T1800Z/ Adams IL-Brown IL-Knox MO-Lewis MO-Marion MO-Monroe MO-Ralls MO- Shelby MO- Including the cities of Hannibal, Mount Sterling, and Quincy 825 PM CST Sat Feb 6 2021 ...WIND CHILL ADVISORY REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO NOON CST SUNDAY... * WHAT...Very cold wind chills expected. Wind chills as low as 20 below zero. * WHERE...Portions of northeast Missouri and west central Illinois. * WHEN...From midnight tonight to noon CST Sunday. * IMPACTS...The cold wind chills could cause frostbite on exposed skin in as little as 30 minutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Wind Chill Advisory means that very cold air and strong winds will combine to generate low wind chill values. This will result in frost bite and lead to hypothermia if precautions are not taken. If you must venture outdoors, make sure you wear a hat and gloves, making sure all exposed skin is covered. && $$ Carney
709 WWUS43 KLSX 070308 WSWLSX URGENT - WINTER WEATHER MESSAGE National Weather Service Saint Louis MO 908 PM CST Sat Feb 6 2021 ILZ058>060-071515- /O.EXP.KLSX.WW.Y.0009.000000T0000Z-210207T0300Z/ /O.CON.KLSX.WC.Y.0001.210207T0600Z-210207T1800Z/ Greene IL-Macoupin IL-Montgomery IL- Including the city of Litchfield 908 PM CST Sat Feb 6 2021 ...WIND CHILL ADVISORY REMAINS IN EFFECT UNTIL NOON CST SUNDAY... ...WINTER WEATHER ADVISORY HAS EXPIRED... * WHAT...Very cold wind chills expected. Wind chills as low as 15 below zero. * WHERE...Montgomery IL, Greene IL and Macoupin IL Counties. * WHEN...Until noon CST Sunday. * IMPACTS...A Wind Chill Advisory means that very cold air and strong winds will combine to generate low wind chill values. This will result in frost bite and lead to hypothermia if precautions are not taken. If you must venture outdoors, make sure you wear a hat and gloves, making sure all exposed skin is covered. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Wind Chill Advisory means that very cold air and strong winds will combine to generate low wind chill values. This will result in frost bite and lead to hypothermia if precautions are not taken. If you must venture outdoors, make sure you wear a hat and gloves, making sure all exposed skin is covered. && $$ ILZ064-065-069-098>102-MOZ052-059>065-072-073-070415- /O.EXP.KLSX.WW.Y.0009.000000T0000Z-210207T0300Z/ Bond IL-Calhoun IL-Clinton IL-Crawford MO-Fayette IL-Franklin MO- Gasconade MO-Jefferson MO-Jersey IL-Lincoln MO-Madison IL- Monroe IL-Saint Charles MO-Saint Clair-Saint Louis City MO- Saint Louis MO-Warren MO-Washington MO- Including the cities of Alton, Belleville, Cahokia, Edwardsville, Saint Charles, Saint Louis, Sullivan, Union, Vandalia, and Washington 908 PM CST Sat Feb 6 2021 ...WINTER WEATHER ADVISORY HAS EXPIRED... Snow is tapering off to flurries. Little or no additional accumulation is expected. $$ ILZ095>097-MOZ018-019-026-027-034>036-071515- /O.CON.KLSX.WC.Y.0001.210207T0600Z-210207T1800Z/ Adams IL-Brown IL-Knox MO-Lewis MO-Marion MO-Monroe MO-Pike IL- Pike MO-Ralls MO-Shelby MO- Including the cities of Bowling Green, Hannibal, Mount Sterling, Pittsfield, and Quincy 908 PM CST Sat Feb 6 2021 ...WIND CHILL ADVISORY REMAINS IN EFFECT UNTIL NOON CST SUNDAY... * WHAT...Very cold wind chills expected. Wind chills as low as 20 below zero. * WHERE...Portions of northeast Missouri and west central Illinois. * WHEN...Until noon CST Sunday. * IMPACTS...A Wind Chill Advisory means that very cold air and strong winds will combine to generate low wind chill values. This will result in frost bite and lead to hypothermia if precautions are not taken. If you must venture outdoors, make sure you wear a hat and gloves, making sure all exposed skin is covered.. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Wind Chill Advisory means that very cold air and strong winds will combine to generate low wind chill values. This will result in frost bite and lead to hypothermia if precautions are not taken. If you must venture outdoors, make sure you wear a hat and gloves, making sure all exposed skin is covered. && $$ Carney
What forecasters said that day
The local office's own words before this winter weather 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 winter weather advisory went out at Feb 5, 11:38 AM CST, 2 hours 41 minutes earlier.
Area forecast discussion, Feb 5, 11:38 AM CST, 2 hours 41 minutes before
Area Forecast Discussion...Updated Aviation National Weather Service Saint Louis MO 1138 AM CST Fri Feb 5 2021 .SHORT TERM... (Through Late Tonight) Issued at 344 AM CST Fri Feb 5 2021 A disorganized area of clouds and light snow was moving rapidly eastward through central MO early this morning associated with a shortwave over southwestern MO. This cloud cover and patchy light snow or flurries will shift east of our forecast area by late morning. Not expecting any accumulation with this snow as it will be light and brief. Another round of light rain/snow is possible across central MO and southwest IL this afternoon and evening as a weak cold front drops southeastward through our area. This will also be a light QPF event. Colder air will advect into northeast MO and west central IL behind this front tonight with lows almost 10 degrees below normal across this area. GKS .LONG TERM... (Saturday through Thursday) Issued at 344 AM CST Fri Feb 5 2021 Much more significant precipitation is expected Saturday afternoon and evening ahead of a northern stream shortwave moving through the Northern Plains and a southern stream shortwave moving eastward through the Southern Plains that try to come into phase by 00Z Sunday. Low level moisture will be somewhat limited across our area. This combined with the progressive nature of the system will limit snow accumulation. Temperatures will be warm enough across southeast MO that the snow could mix with rain Saturday afternoon which will lessen amounts in this area. The highest snow accumulation will occur across northeast MO into west central IL left or north of the track of a weak surface low which will move eastward through central MO. Although there is still some uncertainty with snow amounts it appears that 2 to 3 inches is possible from Edina, MO to Quincy, IL with lesser amounts further south of around 1 inch in the St Louis metro area to only one half inch or less from FAM to SLO. Much colder temperatures are expected beginning Saturday night as an Arctic High plunges southward into our area from the Northern Plains. Light snow will be possible across northeast MO and west central IL Sunday and Sunday night due to low-mid level warm air advection over this very cold air mass. More significant snow is possible from Monday afternoon into Tuesday, although model solutions differ by this time. Prefer the ECMWF model solution which is similar to the NBM which has a surface low passing south of our forecast area as a northern stream shortwave moves through the Northern Plains and Great Lakes region. An even stronger 1035-1040 mb surface ridge will drop into our area Tuesday night with the coldest air of the Winter Season from Tuesday night into Thursday with temperatures around 25 degrees below normal. GKS && .AVIATION... (For the 18z TAFs through 18z Saturday Afternoon) Issued at 1125 AM CST Fri Feb 5 2021 VFR conditions are expected to prevail at the terminals through the majority of the forecast period. A brief round of flurries is possible tonight at KCOU and the St. Louis terminals, but very low confidence in it materializing led to its exclusion from the TAFs. The main story concerns the impending round of snow on Saturday. Lower CIGs should build into the region from west to east through the morning. By around 18Z, the end of this period, light snow should be approaching the terminals, bringing CIGs to low- end VFR. MVFR, and possibly IFR, CIGs with reduced VSBYs will build in quickly during the early afternoon, which will be reflected in future TAFs. SPECIFICS FOR KSTL: VFR conditions are expected to prevail at the terminals through the majority of the forecast period. A brief round of flurries is possible tonight at KCOU and the St. Louis terminals, but very low confidence in it materializing led to its exclusion from the TAFs. The main story concerns the impending round of snow on Saturday. Lower CIGs should build into the region from west to east through the morning. By around 18Z, CIGs should fall to low- end VFR and continue to trend lower with the onset of snow. IFR CIGs are certainly possible, especially when snow picks up, but some uncertainty exists and CIGs bottom out at low-end MVFR by 21Z. MRB && .LSX WATCHES/WARNINGS/ADVISORIES... MO...None. IL...None. && WFO LSX
Hazardous weather outlook, Feb 5, 4:52 AM CST, 9 hours 27 minutes before
Hazardous Weather Outlook National Weather Service Saint Louis MO 452 AM CST Fri Feb 5 2021 ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027- 034>036-041-042-047>052-059>065-072>075-084-085-099-061100- 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-Saint Francois MO-Saint Louis City MO-Saint Louis MO- Sainte Genevieve MO-Shelby MO-Warren MO-Washington IL-Washington MO- 452 AM CST Fri Feb 5 2021 This Hazardous Weather Outlook is for portions of eastern and central Missouri as well as west central and southwest Illinois. .DAY ONE...Today and tonight. No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. Accumulating snow is likely Saturday afternoon and evening, particularly across northeast and central Missouri and west central Illinois. Accumulations of 1 to 3 inches are possible. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated through tonight. GKS
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Winter Weather Advisories in Missouri, 2021Winter Weather Advisories in Illinois, 2021Every winter weather advisory 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.