Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 80, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jul 14, 2021, 8:45 PM CDT for Poweshiek County, Tama County, Iowa. It was in force for 45 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
- Jul 14, 2021, 8:45 PM CDT (01:45 UTC)
- Expired
- Jul 14, 2021, 9:30 PM CDT
- In force
- 45 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Poweshiek County, IA, Tama County, IA
The radar
The Des Moines radar (KDMX), 95 km from the middle of the area, began a volume at 01:48 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 14, 2:35 PM CDT | Tornado Watch | SPC | 8 hr |
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 1.8 hours before the alert went out and 174 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
- 2569 J/kg
- Mixed-layer CIN
- -10 J/kg
- Mixed-layer LCL
- 832 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 253 m²/s²
- 0-3 km storm-relative helicity
- 346 m²/s²
- Significant tornado parameter
- 3.2
- Supercell composite
- 23.4
The text
As transmitted.
262 WUUS53 KDMX 150145 SVRDMX IAC157-171-150230- /O.NEW.KDMX.SV.W.0080.210715T0145Z-210715T0230Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Des Moines IA 845 PM CDT Wed Jul 14 2021 The National Weather Service in Des Moines has issued a * Severe Thunderstorm Warning for... Northern Poweshiek County in central Iowa... Southern Tama County in central Iowa... * Until 930 PM CDT. * At 844 PM CDT, a severe thunderstorm was located 8 miles north of Grinnell, moving east at 30 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. * Locations impacted include... Grinnell, Toledo, Tama, Brooklyn, Meskwaki Casino, Le Grand, Victor, Holiday Lake, Malcom, Chelsea, Montour, Elberon, Hartwick, Vining, Grinnell Regional Airport and Toledo Municipal Airport. This includes Interstate 80 between mile markers 193 and 204. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Tornado Watch remains in effect until 900 PM CDT for central Iowa. Intense thunderstorm lines can produce brief tornadoes and widespread significant wind damage. Although a tornado is not immediately likely, it is best to move to an interior room on the lowest floor of a building. This storm may cause serious injury and significant property damage. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 4170 9277 4207 9277 4205 9230 4168 9230 TIME...MOT...LOC 0144Z 276DEG 28KT 4186 9271 TORNADO...POSSIBLE HAIL...<.75IN WIND...60MPH $$ Fowle
3 follow-up statements
976 WWUS53 KDMX 150205 SVSDMX Severe Weather Statement National Weather Service Des Moines IA 905 PM CDT Wed Jul 14 2021 IAC157-171-150230- /O.CON.KDMX.SV.W.0080.000000T0000Z-210715T0230Z/ Poweshiek IA-Tama IA- 905 PM CDT Wed Jul 14 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM CDT FOR NORTHERN POWESHIEK AND SOUTHERN TAMA COUNTIES... At 905 PM CDT, a severe thunderstorm was located 7 miles west of Belle Plaine, or 12 miles southeast of Toledo, moving east at 40 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. Locations impacted include... Grinnell, Toledo, Tama, Brooklyn, Meskwaki Casino, Le Grand, Victor, Holiday Lake, Malcom, Chelsea, Montour, Elberon, Hartwick, Vining, Grinnell Regional Airport and Toledo Municipal Airport. This includes Interstate 80 between mile markers 193 and 204. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Tornado Watch remains in effect until 1100 PM CDT for central Iowa. Intense thunderstorm lines can produce brief tornadoes and widespread significant wind damage. Although a tornado is not immediately likely, it is best to move to an interior room on the lowest floor of a building. This storm may cause serious injury and significant property damage. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 4170 9277 4207 9277 4205 9230 4168 9230 TIME...MOT...LOC 0205Z 271DEG 35KT 4186 9242 TORNADO...POSSIBLE HAIL...<.75IN WIND...60MPH $$ Fowle
192 WWUS53 KDMX 150210 SVSDMX Severe Weather Statement National Weather Service Des Moines IA 910 PM CDT Wed Jul 14 2021 IAC157-171-150230- /O.CON.KDMX.SV.W.0080.000000T0000Z-210715T0230Z/ Poweshiek IA-Tama IA- 910 PM CDT Wed Jul 14 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM CDT FOR NORTHERN POWESHIEK AND SOUTHERN TAMA COUNTIES... At 909 PM CDT, a severe thunderstorm was located near Belle Plaine, or 14 miles southeast of Toledo, moving east at 30 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. Locations impacted include... Grinnell, Tama, Brooklyn, Victor, Holiday Lake, Malcom, Chelsea, Hartwick and Grinnell Regional Airport. This includes Interstate 80 between mile markers 193 and 204. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Tornado Watch remains in effect until 1100 PM CDT for central Iowa. Intense thunderstorm lines can produce brief tornadoes and widespread significant wind damage. Although a tornado is not immediately likely, it is best to move to an interior room on the lowest floor of a building. This storm may cause serious injury and significant property damage. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 4170 9277 4197 9277 4198 9230 4168 9230 TIME...MOT...LOC 0209Z 276DEG 28KT 4186 9237 TORNADO...POSSIBLE HAIL...<.75IN WIND...60MPH $$ Fowle
049
WWUS53 KDMX 150226
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
926 PM CDT Wed Jul 14 2021
IAC157-171-150236-
/O.EXP.KDMX.SV.W.0080.000000T0000Z-210715T0230Z/
Poweshiek IA-Tama IA-
926 PM CDT Wed Jul 14 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN POWESHIEK AND
SOUTHERN TAMA COUNTIES WILL EXPIRE AT 930 PM CDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire. However gusty
winds and heavy rain are still possible with this thunderstorm.
A Tornado Watch remains in effect until 1100 PM CDT for central Iowa.
LAT...LON 4170 9277 4197 9277 4198 9230 4168 9230
TIME...MOT...LOC 0226Z 281DEG 27KT 4177 9224
$$
FowleThe office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 14, 7:03 PM CDT | Special Weather Statement | DMX | Story | 42 min |
| Jul 14, 7:23 PM CDT | Severe Thunderstorm Warning | DMX | Jasper, Marshall, Polk, Story | 67 min |
| Jul 14, 7:29 PM CDT | Severe Thunderstorm Warning | DMX | Tama | 14 min |
| Jul 14, 8:10 PM CDT | Tornado Warning | DMX | Marshall | 35 min |
| Jul 14, 8:28 PM CDT | Flash Flood Warning | DMX | Marshall, Polk, Story | 6 hr |
| Jul 14, 8:42 PM CDT | Severe Thunderstorm Warning | DMX | Jasper, Marshall, Polk, Story | 43 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 2021Every 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.