Alert archive / Iowa / Special Weather Statements in 2021

Special Weather Statement, NWS Des Moines, IA

May 15, 2021Franklin County, Iowa

NWS Des Moines, IA issued this special weather statement at May 15, 2021, 3:21 PM CDT for Franklin County, Iowa. It was in force for 24 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
May 15, 2021, 3:21 PM CDT (20:21 UTC)
Expired
May 15, 2021, 3:45 PM CDT
In force
24 min
Issued by
NWS Des Moines, IA

County Franklin County, IA

The radar

The Des Moines radar (KDMX), 121 km from the middle of the area, began a volume at 20:22 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

Minneapolis, MN (KMPX), launched 12:00Z, 8.4 hours before the alert went out and 239 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, Minneapolis, MN at 12:00Z on 2021-05-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 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, Minneapolis, MN at 12:00Z on 2021-05-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 57 square meters per square second.19395878Sfc1 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
894 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
57 m²/s²
0-3 km storm-relative helicity
120 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

974 
WWUS83 KDMX 152021
SPSDMX

Special Weather Statement
National Weather Service Des Moines IA
321 PM CDT Sat May 15 2021
 
IAZ026-027-152045-
Franklin IA-Butler IA-
321 PM CDT Sat May 15 2021

...Up to Penny Sized Hail Possible in Franklin County...

At 320 PM CDT, Doppler radar was tracking a strong thunderstorm near
Hampton, moving southeast at 20 mph.

Penny size hail will be possible with this storm.

Locations impacted include...
Hampton, Dumont, Geneva, Hansell, Hampton Municipal Airport and Beeds
Lake State Park.

LAT...LON 4275 9326 4282 9319 4274 9291 4258 9304
TIME...MOT...LOC 2020Z 304DEG 17KT 4274 9313 

$$

Hagenhoff

The office that day

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

IssuedProductOfficeCountiesLasted
May 15, 1:17 PM CDTSpecial Weather StatementDMXKossuth58 min
May 15, 2:29 PM CDTSpecial Weather StatementDMXHancock46 min

Nearby

Special Weather Statements in Iowa, 2021Every special weather statement in 2021

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.