Alert archive / Missouri / Winter Weather Advisories in 2021

Winter Weather Advisory 9, NWS St. Louis, MO

February 5, 202114 counties in Illinois; 24 counties in Missouri

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.

Skew-T log-pSkew-T log-p diagram, Lincoln, IL at 12:00Z on 2021-02-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 12:00Z on 2021-02-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 55 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
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

Open this sounding in Storm Lab

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

Nearby

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.