Alert archive / Iowa / Winter Weather Advisories in 2009

Winter Weather Advisory 21, NWS Des Moines, IA

November 16, 20094 counties in Iowa

NWS Des Moines, IA issued this winter weather advisory at Nov 16, 2009, 3:35 AM CST for 4 counties in Iowa. It took effect at Nov 16, 2009, 12:00 PM CST. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued
Nov 16, 2009, 3:35 AM CST (09:35 UTC)
In effect from
Nov 16, 2009, 12:00 PM CST
Expired
Nov 16, 2009, 8:56 PM CST
In force
9 hr
Issued by
NWS Des Moines, IA

Counties Adams County, IA, Ringgold County, IA, Taylor County, IA, Union County, IA

The radar

The Des Moines radar (KDMX), 113 km from the middle of the area, began a volume at 09:37 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

Topeka, KS (KTOP), launched 00:00Z, 9.6 hours before the alert went out and 232 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, Topeka, KS at 00:00Z on 2009-11-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Topeka, KS at 00:00Z on 2009-11-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 192 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
747 m above ground
0-6 km bulk shear
68 kt
0-1 km storm-relative helicity
192 m²/s²
0-3 km storm-relative helicity
384 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Nov 16, 3:34 AM CSTFlood WatchDMXAppanoose, Davis, Lucas, Mahaska, Marion, Monroe and 2 more31 hr

Nearby

Winter Weather Advisories in Iowa, 2009Every winter weather advisory in 2009

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.