Alert archive / Iowa / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 56, NWS Des Moines, IA

June 24, 2021Davis County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 24, 2021, 11:20 PM CDT for Davis County, Iowa. It was in force for 25 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: Jun 24, 2021, 11:20 PM CDT (04:20 UTC)
Expired: Jun 24, 2021, 11:45 PM CDT
In force: 25 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

County Davis County, IA

The radar

The Des Moines radar (KDMX), 165 km from the middle of the area, began a volume at 04:22 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

Davenport, (KDVN), launched 00:00Z, 4.3 hours before the alert went out and 183 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 112 J/kg
Mixed-layer CIN: -93 J/kg
Mixed-layer LCL: 817 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 151 m²/s²
0-3 km storm-relative helicity: 230 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

Open this sounding in Storm Lab

The text

As transmitted.

687 
WUUS53 KDMX 250420
SVRDMX
IAC051-250445-
/O.NEW.KDMX.SV.W.0056.210625T0420Z-210625T0445Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Des Moines IA
1120 PM CDT Thu Jun 24 2021

The National Weather Service in Des Moines  has issued a

* Severe Thunderstorm Warning for...
  Southeastern Davis County in southeastern Iowa...

* Until 1145 PM CDT.

* At 1119 PM CDT, a severe thunderstorm was located near Milton, or 8
  miles southeast of Bloomfield, moving northeast at 35 mph.

  HAZARD...60 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* This severe thunderstorm will remain over mainly rural areas of
  southeastern Davis County, including the following locations...
  Pulaski.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

&&

LAT...LON 4072 9242 4085 9218 4060 9218 4060 9234
TIME...MOT...LOC 0419Z 243DEG 29KT 4067 9228 

TORNADO...POSSIBLE
HAIL...0.75IN
WIND...60MPH
 
$$

Fowle

1 follow-up statement

082 
WWUS53 KDMX 250439
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
1139 PM CDT Thu Jun 24 2021

IAC051-250449-
/O.EXP.KDMX.SV.W.0056.000000T0000Z-210625T0445Z/
Davis IA-
1139 PM CDT Thu Jun 24 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN DAVIS COUNTY WILL
EXPIRE AT 1145 PM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.  However gusty
winds and heavy rain are still possible with this thunderstorm.

LAT...LON 4072 9242 4085 9218 4060 9218 4060 9234
TIME...MOT...LOC 0439Z 239DEG 24KT 4072 9218 

$$

Fowle

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 24, 7:03 PM CDT	Severe Thunderstorm Warning	DMX	Wapello	42 min
Jun 24, 8:15 PM CDT	Flash Flood Warning	DMX	Davis, Wapello	6 hr
Jun 24, 9:21 PM CDT	Flash Flood Warning	DMX	Appanoose, Lucas, Monroe, Wayne	5 hr
Jun 25, 2:08 AM CDT	Areal Flood Warning	DMX	Davis, Wapello	12 hr
Jun 25, 2:15 AM CDT	Areal Flood Warning	DMX	Appanoose, Lucas, Monroe, Wayne	12 hr
Jun 25, 2:24 PM CDT	Flash Flood Watch	DMX	Appanoose, Davis, Decatur, Lucas, Monroe, Ringgold and 3 more	17 hr

Nearby

Severe Thunderstorm Warnings in Iowa, 2021 Every severe thunderstorm warning 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.