Alert archive / Missouri / Winter Weather Advisories in 2017
Winter Weather Advisory 4, NWS St. Louis, MO
NWS St. Louis, MO issued this winter weather advisory at Dec 29, 2017, 3:39 AM CST for 22 counties in Missouri; 10 counties in Illinois. It took effect at Dec 29, 2017, 1:00 PM CST. It was in force for 14 hr.
The area
The counties it named.
The facts
- Issued
- Dec 29, 2017, 3:39 AM CST (09:39 UTC)
- In effect from
- Dec 29, 2017, 1:00 PM CST
- Expired
- Dec 30, 2017, 3:00 AM CST
- In force
- 14 hr
- Issued by
- NWS St. Louis, MO
All 32 counties
Adams County, IL, Brown County, IL, Calhoun County, IL, Greene County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Monroe 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, 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
The radar
The St Louis radar (KLSX), 60 km from the middle of the area, began a volume at 09:36 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
Davenport, (KDVN), launched 00:00Z, 9.7 hours before the alert went out and 287 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
- 663 m above ground
- 0-6 km bulk shear
- 86 kt
- 0-1 km storm-relative helicity
- 83 m²/s²
- 0-3 km storm-relative helicity
- 199 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 29, 3:10 PM CST | Wind Chill Advisory | LSX | Audrain, Boone, Callaway, Cole, Crawford, Franklin and 23 more | 4 days |
Nearby
Winter Weather Advisories in Missouri, 2017Winter Weather Advisories in Illinois, 2017Every winter weather advisory in 2017
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.