Alert archive / Iowa / Areal Flood Advisories in 2012

Areal Flood Advisory 5, NWS La Crosse, WI

July 25, 2012Fayette County, Iowa

NWS La Crosse, WI issued this areal flood advisory at Jul 25, 2012, 10:55 PM CDT for Fayette County, Iowa. It was in force for 84 min.

The area

The counties it named.

The facts

Issued
Jul 25, 2012, 10:55 PM CDT (03:55 UTC)
Expired
Jul 26, 2012, 12:19 AM CDT
In force
84 min
Issued by
NWS La Crosse, WI
Area
Storm-based polygon

County Fayette County, IA

The radar

The La Crosse radar (KARX), 119 km from the middle of the area, began a volume at 03:56 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, 3.9 hours before the alert went out and 177 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, Davenport, at 00:00Z on 2012-07-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 700 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, Davenport, at 00:00Z on 2012-07-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 84 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
700 J/kg
Mixed-layer CIN
-149 J/kg
Mixed-layer LCL
2702 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
84 m²/s²
0-3 km storm-relative helicity
158 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.0

Open this sounding in Storm Lab

The office that day

Everything else NWS La Crosse, WI issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 25, 9:03 PM CDTSevere Thunderstorm WarningARXGrant57 min
Jul 25, 10:49 PM CDTSevere Thunderstorm WarningARXGrant56 min
Jul 25, 11:45 PM CDTSevere Thunderstorm WarningARXRichland30 min
Jul 25, 8:38 PM CDTSevere Thunderstorm WarningARXClayton22 min
Jul 25, 9:40 PM CDTSevere Thunderstorm WarningARXChickasaw35 min
Jul 25, 10:03 PM CDTSevere Thunderstorm WarningARXFayette, Winneshiek43 min
Jul 25, 10:25 PM CDTSevere Thunderstorm WarningARXClayton65 min

Nearby

Areal Flood Advisories in Iowa, 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.