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 Sep 14, 2021, 1:08 AM CDT for Hamilton 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
- Sep 14, 2021, 1:08 AM CDT (06:08 UTC)
- Expired
- Sep 14, 2021, 1:45 AM CDT
- In force
- 37 min
- Issued by
- NWS Des Moines, IA
- Hail
- 0.88 in
- Wind
- 40
County Hamilton County, IA
The radar
The Des Moines radar (KDMX), 76 km from the middle of the area, began a volume at 06:11 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
Omaha, NE (KOAX), launched 00:00Z, 6.1 hours before the alert went out and 258 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
- 1361 J/kg
- Mixed-layer CIN
- -168 J/kg
- Mixed-layer LCL
- 1731 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 98 m²/s²
- 0-3 km storm-relative helicity
- 213 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 6.1
The text
As transmitted.
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</html>What forecasters said that day
The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Des Moines, IA wrote its last area forecast discussion before this special weather statement went out at Sep 13, 11:57 PM CDT, 1 hour 11 minutes earlier.
Area forecast discussion, Sep 13, 11:57 PM CDT, 1 hour 11 minutes before
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</html>Hazardous weather outlook, Sep 13, 2:46 PM CDT, 10 hours 22 minutes before
Hazardous Weather Outlook National Weather Service Des Moines IA 246 PM CDT Mon Sep 13 2021 IAZ057>062-070>075-081>086-092>097-141100- Audubon-Guthrie-Dallas-Polk-Jasper-Poweshiek-Cass-Adair-Madison- Warren-Marion-Mahaska-Adams-Union-Clarke-Lucas-Monroe-Wapello- Taylor-Ringgold-Decatur-Wayne-Appanoose-Davis- 246 PM CDT Mon Sep 13 2021 This Hazardous Weather Outlook is for portions of central Iowa. .DAY ONE...This afternoon and tonight No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday There is a chance of thunderstorms on Tuesday, mainly south of Interstate 80 in the afternoon and evening. Additional thunderstorm chances are forecast around Thursday night and Friday. No severe weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated. IAZ004>007-015>017-023>028-033>039-044>050-141100- Emmet-Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo- Pocahontas-Humboldt-Wright-Franklin-Butler-Bremer-Sac-Calhoun- Webster-Hamilton-Hardin-Grundy-Black Hawk-Crawford-Carroll-Greene- Boone-Story-Marshall-Tama- 246 PM CDT Mon Sep 13 2021 This Hazardous Weather Outlook is for portions of central Iowa. .DAY ONE...This afternoon and tonight Widely scattered showers and thunderstorms are expected across mainly far northern Iowa this evening and tonight. A few strong to severe storms may produce large hail, and an isolated tornado remains possible near the Minnesota border. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday Thunderstorm chances return to the forecast from Thursday through Friday. The threat of severe weather appears low at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated. Lee
In the hours before
Special weather statement, Sep 13, 10:02 PM CDT, 3 hours 6 minutes before
Special Weather Statement
National Weather Service Des Moines IA
1002 PM CDT Mon Sep 13 2021
IAZ044-140330-
Crawford IA-
1002 PM CDT Mon Sep 13 2021
...A strong thunderstorm will impact portions of central Crawford
County through 1030 PM CDT...
At 1001 PM CDT, Doppler radar was tracking a strong thunderstorm 7
miles east of Ute, or 11 miles west of Denison, moving east at 40
mph.
HAZARD...Winds in excess of 30 mph and half inch hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
This strong thunderstorm will be near...
Denison around 1020 PM CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4198 9567 4211 9567 4219 9523 4201 9518
TIME...MOT...LOC 0301Z 257DEG 36KT 4205 9557
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...30 MPH
HagenhoffSpecial weather statement, Sep 14, 1:08 AM CDT, 0 minutes before
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</html>The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 13, 10:02 PM CDT | Special Weather Statement | DMX | Crawford | 28 min |
| Sep 13, 10:18 PM CDT | Severe Thunderstorm Warning | DMX | Carroll, Crawford | 27 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.