Alert archive / Iowa / Special Weather Statements in 2021
Special Weather Statement, NWS Des Moines, IA
NWS Des Moines, IA issued this special weather statement at Aug 8, 2021, 10:39 PM CDT for Webster County, Iowa. It was in force for 51 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 8, 2021, 10:39 PM CDT (03:39 UTC)
- Expired
- Aug 8, 2021, 11:30 PM CDT
- In force
- 51 min
- Issued by
- NWS Des Moines, IA
- Hail
- 0.75 in
- Wind
- 30
County Webster County, IA
The radar
The Des Moines radar (KDMX), 79 km from the middle of the area, began a volume at 03:42 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 8, 11:23 PM CDT | TORNADO | 3 Ssw Otho, IA | PAST WITHIN 50 YARDS OF CHASER. REPORT VIA SOCIAL MEDIA. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 3.7 hours before the alert went out and 215 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.
- Mixed-layer CAPE
- 1733 J/kg
- Mixed-layer CIN
- -130 J/kg
- Mixed-layer LCL
- 1356 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 104 m²/s²
- 0-3 km storm-relative helicity
- 137 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 6.0
The text
As transmitted.
786
WWUS83 KDMX 090339
SPSDMX
Special Weather Statement
National Weather Service Des Moines IA
1039 PM CDT Sun Aug 8 2021
IAZ035-090430-
Webster IA-
1039 PM CDT Sun Aug 8 2021
...A strong thunderstorm will impact portions of southern Webster
County through 1130 PM CDT...
At 1039 PM CDT, Doppler radar was tracking a strong thunderstorm 8
miles north of Gowrie, or 8 miles southwest of Fort Dodge, moving
southeast at 20 mph.
HAZARD...Penny size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to outdoor objects is possible.
This strong thunderstorm will be near...
Gowrie around 1055 PM CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4249 9429 4231 9393 4222 9399 4221 9422
4240 9438
TIME...MOT...LOC 0339Z 311DEG 19KT 4240 9428
MAX HAIL SIZE...0.75 IN
MAX WIND GUST...<30 MPH
$$
CogilThe office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 8, 8:36 PM CDT | Tornado Warning | DMX | Pocahontas | 24 min |
| Aug 8, 9:02 PM CDT | Tornado Warning | DMX | Calhoun, Pocahontas | 31 min |
| Aug 8, 11:00 PM CDT | Tornado Warning | DMX | Webster | 30 min |
| Aug 8, 11:30 PM CDT | Tornado Warning | DMX | Webster | 30 min |
| Aug 8, 11:52 PM CDT | Tornado Warning | DMX | Boone, Webster | 38 min |
| Aug 9, 12:23 AM CDT | Tornado Warning | DMX | Butler, Franklin | 20 min |
| Aug 9, 12:29 AM CDT | Severe Thunderstorm Warning | DMX | Boone, Hamilton, Webster | 46 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.