Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 87, NWS Omaha, NE
NWS Omaha, NE issued this severe thunderstorm warning at Jul 9, 2021, 1:14 AM CDT for Harrison County, Monona County, Iowa. It was in force for 31 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 9, 2021, 1:14 AM CDT (06:14 UTC)
- Expired
- Jul 9, 2021, 1:45 AM CDT
- In force
- 31 min
- Issued by
- NWS Omaha, NE
- Area
- Storm-based polygon
- Hail
- 1.5 in
- Wind
- 50.0 mph
Counties Harrison County, IA, Monona County, IA
The radar
The Omaha radar (KOAX), 81 km from the middle of the area, began a volume at 06:17 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, 6.2 hours before the alert went out and 81 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
- 155 J/kg
- Mixed-layer CIN
- -474 J/kg
- Mixed-layer LCL
- 1131 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 200 m²/s²
- 0-3 km storm-relative helicity
- 406 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted.
774
WUUS53 KOAX 090614
SVROAX
IAC085-133-090645-
/O.NEW.KOAX.SV.W.0087.210709T0614Z-210709T0645Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Omaha/Valley Nebraska
114 AM CDT Fri Jul 9 2021
The National Weather Service in Omaha has issued a
* Severe Thunderstorm Warning for...
Monona County in west central Iowa...
North central Harrison County in southwestern Iowa...
* Until 145 AM CDT.
* At 113 AM CDT, a severe thunderstorm was located 5 miles east of
Onawa, or 32 miles west of Denison, moving east at 40 mph.
HAZARD...Ping pong ball size hail.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect
damage to roofs, siding, windows, and vehicles.
* This severe thunderstorm will be near...
Moorhead around 125 AM CDT.
Ute around 130 AM CDT.
This includes Interstate 29 between mile markers 105 and 109.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4179 9569 4193 9614 4196 9613 4199 9615
4221 9602 4215 9567 4186 9567
TIME...MOT...LOC 0613Z 291DEG 41KT 4204 9599
HAIL...1.50IN
WIND...<50MPH
$$
Fajman3 follow-up statements
167
WWUS53 KOAX 090625
SVSOAX
Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
125 AM CDT Fri Jul 9 2021
IAC085-133-090645-
/O.CON.KOAX.SV.W.0087.000000T0000Z-210709T0645Z/
Monona IA-Harrison IA-
125 AM CDT Fri Jul 9 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 145 AM CDT
FOR EASTERN MONONA AND NORTH CENTRAL HARRISON COUNTIES...
At 125 AM CDT, a severe thunderstorm was located near Moorhead, or 23
miles west of Denison, moving east at 45 mph.
HAZARD...Ping pong ball size hail.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect damage
to roofs, siding, windows, and vehicles.
This severe storm will be near...
Ute around 130 AM CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4179 9569 4190 9598 4215 9606 4221 9602
4215 9567 4186 9567
TIME...MOT...LOC 0625Z 291DEG 41KT 4199 9582
HAIL...1.50IN
WIND...<50MPH
$$
Fajman028
WWUS53 KOAX 090638
SVSOAX
Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
138 AM CDT Fri Jul 9 2021
IAC085-133-090645-
/O.CON.KOAX.SV.W.0087.000000T0000Z-210709T0645Z/
Monona IA-Harrison IA-
138 AM CDT Fri Jul 9 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 145 AM CDT
FOR SOUTHEASTERN MONONA AND NORTH CENTRAL HARRISON COUNTIES...
At 138 AM CDT, a severe thunderstorm was located 5 miles north of
Dunlap, or 15 miles west of Denison, moving east at 45 mph.
HAZARD...Quarter size hail.
SOURCE...Radar indicated.
IMPACT...Damage to vehicles is expected.
This severe thunderstorm will remain over mainly rural areas of
southeastern Monona and north central Harrison Counties, including
the following locations... Soldier.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4182 9568 4189 9587 4203 9581 4199 9567
4186 9567
TIME...MOT...LOC 0638Z 291DEG 41KT 4193 9563
HAIL...1.00IN
WIND...<50MPH
$$
Fajman082
WWUS53 KOAX 090642
SVSOAX
Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
142 AM CDT Fri Jul 9 2021
IAC085-133-090652-
/O.EXP.KOAX.SV.W.0087.000000T0000Z-210709T0645Z/
Monona IA-Harrison IA-
142 AM CDT Fri Jul 9 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MONONA AND NORTH
CENTRAL HARRISON COUNTIES WILL EXPIRE AT 145 AM CDT...
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.
LAT...LON 4182 9568 4189 9587 4203 9581 4199 9567
4186 9567
TIME...MOT...LOC 0642Z 291DEG 41KT 4193 9563
$$
FajmanThe office that day
Everything else NWS Omaha, NE issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 9, 2:29 AM CDT | Special Weather Statement | OAX | Shelby | 31 min |
| Jul 9, 6:48 AM CDT | Special Weather Statement | OAX | Shelby | 27 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.