Alert archive / Illinois / Areal Flood Advisories in 2012

Areal Flood Advisory 1, NWS St. Louis, MO

January 17, 20129 counties in Missouri; 10 counties in Illinois

NWS St. Louis, MO issued this areal flood advisory at Jan 17, 2012, 4:34 AM CST for 9 counties in Missouri; 10 counties in Illinois. It was in force for 60 days.

The area

The counties it named.

The facts

Issued
Jan 17, 2012, 4:34 AM CST (10:34 UTC)
Expired
Mar 17, 2012, 3:00 PM CDT
In force
60 days
Issued by
NWS St. Louis, MO
Area
Storm-based polygon

Counties Bond County, IL, Clinton County, IL, Fayette County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Montgomery County, IL, Saint Clair County, IL, Washington County, IL, City of Saint Louis, MO, Cole County, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Jefferson County, MO, Saint Charles County, MO, Saint Louis County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 41 km from the middle of the area, began a volume at 10:37 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, 10.6 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.

Skew-T log-pSkew-T log-p diagram, Lincoln, IL at 00:00Z on 2012-01-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2 joules per kilogram.LCLLFCEL10008507005003002001001 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 00:00Z on 2012-01-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 431 square meters per square second.1939587897117Sfc1 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
2 J/kg
Mixed-layer CIN
-49 J/kg
Mixed-layer LCL
748 m above ground
0-6 km bulk shear
65 kt
0-1 km storm-relative helicity
431 m²/s²
0-3 km storm-relative helicity
500 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Jan 16, 11:59 PM CSTSevere Thunderstorm WarningLSXCallaway, Cole, Gasconade, Montgomery, Osage58 days
Jan 17, 12:39 AM CSTTornado WarningLSXGasconade, Osage36 min
Jan 17, 12:55 AM CSTSevere Thunderstorm WarningLSXLincoln, Saint Charles, Warren35 min
Jan 17, 1:14 AM CSTSevere Thunderstorm WarningLSXFranklin, Gasconade31 min
Jan 17, 1:23 AM CSTSevere Thunderstorm WarningLSXSaint Charles, Saint Louis37 min
Jan 17, 1:39 AM CSTTornado WarningLSXFranklin, Jefferson36 min
Jan 17, 1:41 AM CSTTornado WarningLSXCrawford, Franklin34 min
Jan 17, 2:08 AM CSTSevere Thunderstorm WarningLSXJefferson, Saint Louis, City of Saint Louis37 min
Jan 17, 2:12 AM CSTTornado WarningLSXFranklin, Jefferson, Washington33 min
Jan 17, 2:35 AM CSTTornado WarningLSXJefferson, Saint Louis40 min
Jan 17, 4:18 AM CSTSevere Thunderstorm WarningLSXCrawford27 min
Jan 17, 5:22 AM CSTSevere Thunderstorm WarningLSXJefferson, Sainte Genevieve38 min
Jan 17, 6:01 AM CSTSevere Thunderstorm WarningLSXIron, Sainte Genevieve, Saint Francois, Washington44 min
Jan 17, 6:25 AM CSTSevere Thunderstorm WarningLSXIron, Madison, Reynolds, Saint Francois50 min
Jan 17, 2:17 AM CSTSevere Thunderstorm WarningLSXMadison28 min
Jan 17, 2:38 AM CSTSevere Thunderstorm WarningLSXClinton, Madison, Saint Clair52 min
Jan 17, 2:39 AM CSTSevere Thunderstorm WarningLSXBond36 min
Jan 17, 3:07 AM CSTTornado WarningLSXClinton, Monroe, Saint Clair, Washington38 min
Jan 17, 3:23 AM CSTSevere Thunderstorm WarningLSXClinton, Marion35 min
Jan 17, 3:46 AM CSTTornado WarningLSXClinton, Washington29 min
Jan 17, 5:14 AM CSTSevere Thunderstorm WarningLSXBond, Clinton, Madison, Saint Clair46 min
Jan 17, 5:47 AM CSTSevere Thunderstorm WarningLSXClinton, Fayette, Marion43 min
Jan 17, 5:53 AM CSTSevere Thunderstorm WarningLSXMonroe, Randolph, Saint Clair, Washington52 min
Jan 17, 6:35 AM CSTSevere Thunderstorm WarningLSXRandolph25 min

Nearby

Areal Flood Advisories in Illinois, 2012Areal Flood Advisories in Missouri, 2012Every areal flood advisory in 2012

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.