Alert archive / Missouri / Dense Fog Advisories in 2011
Dense Fog Advisory 4, NWS St. Louis, MO
NWS St. Louis, MO issued this dense fog advisory at Feb 26, 2011, 9:49 PM CST for 13 counties in Missouri; Adams County, Brown County, Pike County, Illinois. It was in force for 6 hr.
The area
The counties it named.
The facts
- Issued
- Feb 26, 2011, 9:49 PM CST (03:49 UTC)
- Expired
- Feb 27, 2011, 3:46 AM CST
- In force
- 6 hr
- Issued by
- NWS St. Louis, MO
Counties Adams County, IL, Brown County, IL, Pike County, IL, Audrain County, MO, Boone County, MO, Callaway County, MO, Cole County, MO, Knox County, MO, Lewis County, MO, Marion County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Pike County, MO, Ralls County, MO, Shelby County, MO
The radar
The St Louis radar (KLSX), 121 km from the middle of the area, began a volume at 03:47 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 00:00Z, 3.8 hours before the alert went out and 278 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
- 545 m above ground
- 0-6 km bulk shear
- 85 kt
- 0-1 km storm-relative helicity
- 190 m²/s²
- 0-3 km storm-relative helicity
- 342 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this dense fog 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 dense fog advisory went out at Feb 26, 5:45 PM CST, 4 hours 4 minutes earlier.
Area forecast discussion, Feb 26, 5:45 PM CST, 4 hours 4 minutes before
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</html>The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 27, 10:37 AM CST | Severe Thunderstorm Warning | LSX | Audrain, Pike | 23 min |
| Feb 27, 1:18 PM CST | Flood Watch | LSX | Audrain, Boone, Callaway, Cole, Knox, Lewis and 8 more | 11 hr |
| Feb 27, 3:10 PM CST | Dense Fog Advisory | LSX | Audrain, Knox, Lewis, Marion, Monroe, Pike and 2 more | 6 hr |
| Feb 27, 5:42 PM CST | Severe Thunderstorm Warning | LSX | Marion, Monroe, Shelby | 48 min |
| Feb 27, 10:40 AM CST | River Flood Warning | LSX | Pike, Scott | 22 days |
Nearby
Dense Fog Advisories in Missouri, 2011Dense Fog Advisories in Illinois, 2011Every dense fog advisory in 2011
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.