Alert archive / Missouri / Frost Advisories in 2026
Frost Advisory 1, NWS St. Louis, MO
NWS St. Louis, MO issued this frost advisory at Mar 27, 2026, 11:40 AM CDT for Saint Louis County, City of Saint Louis, Missouri. It took effect at Mar 28, 2026, 1:00 AM CDT. It was in force for 8 hr.
The area
The counties it named.
The facts
- Issued
- Mar 27, 2026, 11:40 AM CDT (16:40 UTC)
- In effect from
- Mar 28, 2026, 1:00 AM CDT
- Expired
- Mar 28, 2026, 9:00 AM CDT
- In force
- 8 hr
- Issued by
- NWS St. Louis, MO
The radar
The St Louis radar (KLSX), 32 km from the middle of the area, began a volume at 16:42 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, 4.7 hours before the alert went out and 224 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
- 1305 m above ground
- 0-6 km bulk shear
- 71 kt
- 0-1 km storm-relative helicity
- 12 m²/s²
- 0-3 km storm-relative helicity
- 99 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 |
|---|---|---|---|---|
| Mar 27, 11:40 AM CDT | Freeze Warning | LSX | Audrain, Boone, Callaway, Cole, Crawford, Franklin and 21 more | 21 hr |
Nearby
Frost Advisories in Missouri, 2026Every frost advisory in 2026
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.