Alert archive / Iowa / Tornado Warnings in 2021
Tornado Warning 8, NWS Omaha, NE
NWS Omaha, NE issued this tornado warning at Jul 30, 2021, 10:12 PM CDT for Page County, Iowa. It was in force for 18 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 30, 2021, 10:12 PM CDT (03:12 UTC)
- Expired
- Jul 30, 2021, 10:30 PM CDT
- In force
- 18 min
- Issued by
- NWS Omaha, NE
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 0.75 in
County Page County, IA
The radar
The Omaha radar (KOAX), 137 km from the middle of the area, began a volume at 03:11 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 30, 8:47 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 3.2 hours before the alert went out and 137 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
- 2669 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 967 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 52 m²/s²
- 0-3 km storm-relative helicity
- 279 m²/s²
- Significant tornado parameter
- 3.4
- Supercell composite
- 19.5
The text
As transmitted.
144
WFUS53 KOAX 310312
TOROAX
IAC145-310330-
/O.NEW.KOAX.TO.W.0008.210731T0312Z-210731T0330Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Omaha/Valley Nebraska
1012 PM CDT Fri Jul 30 2021
The National Weather Service in Omaha has issued a
* Tornado Warning for...
South central Page County in southwestern Iowa...
* Until 1030 PM CDT.
* At 1012 PM CDT, a severe thunderstorm capable of producing a
tornado was located over Braddyville, or 18 miles west of Bedford,
moving south at 30 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed.
Damage to roofs, windows, and vehicles will occur. Tree
damage is likely.
* This dangerous storm will be near...
Braddyville around 1015 PM CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4057 9498 4058 9510 4058 9511 4064 9512
4066 9505 4058 9497
TIME...MOT...LOC 0312Z 338DEG 24KT 4061 9506
TORNADO...RADAR INDICATED
HAIL...<.75IN
$$
Petersen2 follow-up statements
844
WWUS53 KOAX 310322
SVSOAX
Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
1022 PM CDT Fri Jul 30 2021
IAC145-310330-
/O.CON.KOAX.TO.W.0008.000000T0000Z-210731T0330Z/
Page IA-
1022 PM CDT Fri Jul 30 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1030 PM CDT FOR SOUTH
CENTRAL PAGE COUNTY...
At 1022 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Braddyville, or 16 miles northwest of Maryville,
moving south at 30 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
This tornadic thunderstorm will remain over mainly rural areas of
south central Page County, including the following locations...
Braddyville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4058 9508 4061 9509 4062 9501 4058 9497
4057 9498
TIME...MOT...LOC 0322Z 338DEG 24KT 4055 9503
TORNADO...RADAR INDICATED
HAIL...<.75IN
$$
Petersen429
WWUS53 KOAX 310326
SVSOAX
Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
1026 PM CDT Fri Jul 30 2021
IAC145-310335-
/O.EXP.KOAX.TO.W.0008.000000T0000Z-210731T0330Z/
Page IA-
1026 PM CDT Fri Jul 30 2021
...THE TORNADO WARNING FOR SOUTH CENTRAL PAGE COUNTY WILL EXPIRE AT
1030 PM CDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.
A Severe Thunderstorm Watch remains in effect until 200 AM CDT for
southwestern Iowa.
LAT...LON 4058 9508 4061 9509 4062 9501 4058 9497
4057 9498
TIME...MOT...LOC 0325Z 338DEG 24KT 4053 9502
$$
PetersenThe office that day
Everything else NWS Omaha, NE issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 8:06 PM CDT | Special Weather Statement | OAX | Pottawattamie | 24 min |
| Jul 30, 8:12 PM CDT | Severe Thunderstorm Warning | OAX | Pottawattamie, Shelby | 33 min |
| Jul 30, 8:42 PM CDT | Severe Thunderstorm Warning | OAX | Mills, Montgomery, Page, Pottawattamie | 33 min |
| Jul 30, 9:03 PM CDT | Severe Thunderstorm Warning | OAX | Fremont, Mills, Page | 42 min |
| Jul 30, 9:13 PM CDT | Severe Thunderstorm Warning | OAX | Montgomery, Page | 32 min |
| Jul 30, 9:39 PM CDT | Severe Thunderstorm Warning | OAX | Fremont, Page | 51 min |
| Jul 31, 2:14 AM CDT | Special Weather Statement | OAX | Pottawattamie | 76 min |
Nearby
Tornado Warnings in Iowa, 2021Every tornado warning in 2021Tornadoes 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.