Alert archive / Iowa / Special Weather Statements in 2021

Special Weather Statement, NWS Des Moines, IA

August 27, 2021Hancock County, Iowa

NWS Des Moines, IA issued this special weather statement at Aug 27, 2021, 2:08 PM CDT for Hancock County, Iowa. It was in force for 37 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: Aug 27, 2021, 2:08 PM CDT (19:08 UTC)
Expired: Aug 27, 2021, 2:45 PM CDT
In force: 37 min
Issued by: NWS Des Moines, IA
Hail: 0.75 in
Wind: 50

County Hancock County, IA

The radar

The Des Moines radar (KDMX), 132 km from the middle of the area, began a volume at 19:10 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, 7.1 hours before the alert went out and 218 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: 487 J/kg
Mixed-layer CIN: -63 J/kg
Mixed-layer LCL: 644 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: -9 m²/s²
0-3 km storm-relative helicity: -16 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

320 
WWUS83 KDMX 271908
SPSDMX

Special Weather Statement
National Weather Service Des Moines IA
208 PM CDT Fri Aug 27 2021
 
IAZ005-016-024-025-271945-
Humboldt IA-Wright IA-Kossuth IA-Hancock IA-
208 PM CDT Fri Aug 27 2021

...A strong thunderstorm will impact portions of northwestern Wright,
southeastern Kossuth, southern Hancock and northeastern Humboldt
Counties through 245 PM CDT...

At 207 PM CDT, Doppler radar was tracking a strong thunderstorm 10
miles northeast of Dakota City, moving northeast at 50 mph.

HAZARD...Wind gusts up to 50 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around 
         unsecured objects. Minor damage to outdoor objects is 
         possible.

Locations impacted include...
  Britt and Eagle Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

&&

LAT...LON 4278 9414 4287 9422 4317 9366 4292 9352
TIME...MOT...LOC 1907Z 240DEG 49KT 4286 9409 

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...50 MPH

$$

Hahn

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 26, 7:02 PM CDT	Severe Thunderstorm Warning	DMX	Audubon, Carroll	28 min
Aug 26, 8:35 PM CDT	Special Weather Statement	DMX	Poweshiek	40 min
Aug 26, 8:47 PM CDT	Severe Thunderstorm Warning	DMX	Mahaska, Poweshiek	58 min
Aug 26, 9:46 PM CDT	Special Weather Statement	DMX	Mahaska	44 min
Aug 26, 10:26 PM CDT	Special Weather Statement	DMX	Mahaska	34 min
Aug 26, 10:30 PM CDT	Severe Thunderstorm Warning	DMX	Emmet, Palo Alto	45 min
Aug 26, 10:52 PM CDT	Special Weather Statement	DMX	Wapello	38 min
Aug 26, 11:42 PM CDT	Severe Thunderstorm Warning	DMX	Emmet, Palo Alto	33 min
Aug 27, 12:13 AM CDT	Special Weather Statement	DMX	Emmet	32 min
Aug 27, 2:59 PM CDT	Special Weather Statement	DMX	Cerro Gordo	16 min
Aug 27, 4:23 PM CDT	Severe Thunderstorm Warning	DMX	Cerro Gordo, Hancock	52 min
Aug 27, 4:48 PM CDT	Tornado Warning	DMX	Cerro Gordo, Hancock	57 min
Aug 27, 4:58 PM CDT	Severe Thunderstorm Warning	DMX	Cerro Gordo, Franklin, Hancock	32 min
Aug 27, 5:23 PM CDT	Tornado Warning Tornado observed	DMX	Cerro Gordo	37 min
Aug 27, 5:25 PM CDT	Tornado Warning	DMX	Cerro Gordo	35 min

Nearby

Special Weather Statements in Iowa, 2021 Every 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.