Alert archive / Missouri / Areal Flood Advisories in 2012

Areal Flood Advisory 23, NWS St. Louis, MO

August 8, 2012Saint Charles County, Missouri

NWS St. Louis, MO issued this areal flood advisory at Aug 8, 2012, 10:51 PM CDT for Saint Charles County, Missouri. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
Aug 8, 2012, 10:51 PM CDT (03:51 UTC)
Expired
Aug 9, 2012, 3:00 AM CDT
In force
4 hr
Issued by
NWS St. Louis, MO
Area
Storm-based polygon

County Saint Charles County, MO

The radar

The St Louis radar (KLSX), 9 km from the middle of the area, began a volume at 03:53 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, 3.9 hours before the alert went out and 234 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 2012-08-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 296 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 2012-08-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 33 square meters per square second.193958Sfc1 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
296 J/kg
Mixed-layer CIN
-254 J/kg
Mixed-layer LCL
1804 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
33 m²/s²
0-3 km storm-relative helicity
80 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
Aug 8, 7:26 PM CDTSevere Thunderstorm WarningLSXCole34 min
Aug 8, 7:47 PM CDTSevere Thunderstorm WarningLSXCallaway, Cole, Osage33 min
Aug 8, 9:31 PM CDTSevere Thunderstorm WarningLSXSaint Charles, Warren44 min
Aug 8, 8:58 PM CDTSevere Thunderstorm WarningLSXJersey, Macoupin, Madison47 min

Nearby

Areal 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.