Alert archive / Missouri / Freeze Warnings in 2019

Freeze Warning 1, NWS St. Louis, MO

October 11, 201922 counties in Missouri; Adams County, Illinois

NWS St. Louis, MO issued this freeze warning at Oct 11, 2019, 3:57 AM CDT for 22 counties in Missouri; Adams County, Illinois. It took effect at Oct 12, 2019, 3:00 AM CDT. It was in force for 5 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Oct 11, 2019, 3:57 AM CDT (08:57 UTC)
In effect from: Oct 12, 2019, 3:00 AM CDT
Expired: Oct 12, 2019, 8:00 AM CDT
In force: 5 hr
Issued by: NWS St. Louis, MO

All 23 counties

Adams County, IL, Audrain County, MO, Boone County, MO, Callaway County, MO, Cole County, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Iron County, MO, Knox County, MO, Lewis County, MO, Madison County, MO, Marion County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Osage County, MO, Ralls County, MO, Reynolds County, MO, Saint Francois County, MO, Shelby County, MO, Warren County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 73 km from the middle of the area, began a volume at 09:01 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

Springfield, MO (KSGF), launched 00:00Z, 9.0 hours before the alert went out and 290 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1204 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 699 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 365 m²/s²
0-3 km storm-relative helicity: 376 m²/s²
Significant tornado parameter: 2.3
Supercell composite: 12.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this freeze warning 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 freeze warning went out at Oct 10, 11:56 PM CDT, 4 hours 1 minute earlier.

Area forecast discussion, Oct 10, 11:56 PM CDT, 4 hours 1 minute before

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Hazardous weather outlook, Oct 10, 3:44 PM CDT, 12 hours 13 minutes before

Hazardous Weather Outlook
National Weather Service Saint Louis MO
344 PM CDT Thu Oct 10 2019

ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027-
034>036-041-042-047>052-059>065-072>075-084-085-099-112045-
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-
344 PM CDT Thu Oct 10 2019

This Hazardous Weather Outlook is for portions of eastern and
central Missouri as well as west central and southwest Illinois.

.DAY ONE...Tonight.

Showers and thunderstorms are likely overnight tonight.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

There is a slight chance of thunderstorms Friday morning across southwest
Illinois.

Another chance of showers and storms exists across the area Tuesday
afternoon ahead of another cold front.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated tonight.

Gosselin

The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 10, 8:15 PM CDT	Special Weather Statement	LSX	Cole	45 min
Oct 10, 8:48 PM CDT	Areal Flood Advisory	LSX	Cole, Osage	3 hr
Oct 10, 8:53 PM CDT	River Flood Warning	LSX	Lincoln	12 days
Oct 11, 2:11 AM CDT	River Flood Warning	LSX	Cole	30 hr
Oct 11, 2:30 AM CDT	Areal Flood Advisory	LSX	Cole, Osage	6 hr
Oct 11, 4:40 AM CDT	Areal Flood Advisory	LSX	Sainte Genevieve, Saint Francois, Washington	6 hr
Oct 11, 2:42 PM CDT	Frost Advisory	LSX	Jefferson, Saint Charles, Sainte Genevieve, Saint Louis, City of Saint Louis	17 hr

Nearby

Freeze Warnings in Missouri, 2019 Freeze Warnings in Illinois, 2019 Every freeze warning in 2019

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.