Alert archive / Iowa / Severe Thunderstorm Warnings in 2022

Severe Thunderstorm Warning 113, NWS Omaha, NE

May 19, 2022Monona County, Iowa

NWS Omaha, NE issued this severe thunderstorm warning at May 19, 2022, 11:08 PM CDT for Monona County, Iowa. It was in force for 27 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: May 19, 2022, 11:08 PM CDT (04:08 UTC)
Expired: May 19, 2022, 11:35 PM CDT
In force: 27 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Monona County, IA

The radar

The Omaha radar (KOAX), 94 km from the middle of the area, began a volume at 04:11 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.

What was reported inside it

Time	Report	Where	Remark
May 19, 11:28 PM CDT	HAIL 1	6 Ene Mapleton, IA	HAIL UP TO AROUND THE SIZE OF A QUARTER. HALF AN INCH OF RAIN.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched one storm report to this severe thunderstorm warning; the first came 20 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 19, 8:57 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 4.1 hours before the alert went out and 94 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 631 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 2674 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 142 m²/s²
0-3 km storm-relative helicity: 223 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.2

Open this sounding in Storm Lab

The text

As transmitted.

135 
WUUS53 KOAX 200408
SVROAX
IAC133-200500-
/O.NEW.KOAX.SV.W.0113.220520T0408Z-220520T0500Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Omaha/Valley Nebraska
1108 PM CDT Thu May 19 2022

The National Weather Service in Omaha has issued a

* Severe Thunderstorm Warning for...
  Eastern Monona County in west central Iowa...

* Until midnight CDT.

* At 1107 PM CDT, a severe thunderstorm was located near Castana, or
  24 miles northeast of Tekamah, moving northeast at 45 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* This severe thunderstorm will be near...
  Mapleton around 1125 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4194 9599 4214 9611 4221 9593 4221 9568
      4212 9567 4199 9567
TIME...MOT...LOC 0407Z 228DEG 41KT 4207 9596 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Miller

4 follow-up statements

699 
WWUS53 KOAX 200415
SVSOAX

Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
1115 PM CDT Thu May 19 2022

IAC133-200500-
/O.CON.KOAX.SV.W.0113.000000T0000Z-220520T0500Z/
Monona IA-
1115 PM CDT Thu May 19 2022

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL MIDNIGHT CDT
FOR NORTHEASTERN MONONA COUNTY...

At 1115 PM CDT, a severe thunderstorm was located 4 miles northeast
of Castana, or 24 miles southwest of Ida Grove, moving northeast at
45 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

This severe storm will be near...
  Mapleton around 1125 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4198 9589 4217 9603 4221 9593 4221 9568
      4212 9567 4201 9567
TIME...MOT...LOC 0415Z 230DEG 41KT 4212 9585 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Miller

061 
WWUS53 KOAX 200421
SVSOAX

Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
1121 PM CDT Thu May 19 2022

IAC133-200500-
/O.CON.KOAX.SV.W.0113.000000T0000Z-220520T0500Z/
Monona IA-
1121 PM CDT Thu May 19 2022

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL MIDNIGHT CDT
FOR NORTHEASTERN MONONA COUNTY...

At 1120 PM CDT, a severe thunderstorm was located near Mapleton, or 
19 miles southwest of Ida Grove, moving northeast at 50 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

This severe thunderstorm will remain over mainly rural areas of
northeastern Monona County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4203 9580 4216 9591 4221 9586 4221 9568
      4212 9567 4204 9567
TIME...MOT...LOC 0420Z 232DEG 44KT 4216 9576 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Miller

374 
WWUS53 KOAX 200427
SVSOAX

Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
1127 PM CDT Thu May 19 2022

IAC133-200500-
/O.CON.KOAX.SV.W.0113.000000T0000Z-220520T0500Z/
Monona IA-
1127 PM CDT Thu May 19 2022

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL MIDNIGHT CDT
FOR NORTHEASTERN MONONA COUNTY...

At 1127 PM CDT, a severe thunderstorm was located 3 miles south of
Danbury, or 16 miles southwest of Ida Grove, moving northeast at 45
mph.

HAZARD...60 mph wind gusts and half dollar size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

This severe thunderstorm will remain over mainly rural areas of
northeastern Monona County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4211 9577 4217 9583 4221 9582 4221 9568
      4212 9567 4210 9568
TIME...MOT...LOC 0427Z 233DEG 38KT 4218 9571 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Miller

982 
WWUS53 KOAX 200435
SVSOAX

Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
1135 PM CDT Thu May 19 2022

IAC133-200443-
/O.CAN.KOAX.SV.W.0113.000000T0000Z-220520T0500Z/
Monona IA-
1135 PM CDT Thu May 19 2022

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN MONONA COUNTY IS
CANCELLED...
        
The storm which prompted the warning has exited the warned area. 
Therefore, the warning has been cancelled. 

If you received hail or wind damage as this storm moved across your 
area in Monona county, please give your report to local law 
enforcement for relay to the National Weather Service in Omaha. 


LAT...LON 4211 9577 4217 9583 4221 9582 4221 9568
      4212 9567 4210 9568
TIME...MOT...LOC 0432Z 228DEG 41KT 4223 9564 

$$

Miller

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Omaha, NE wrote its last area forecast discussion before this severe thunderstorm warning went out at May 19, 6:11 PM CDT, 4 hours 57 minutes earlier.

Area forecast discussion, May 19, 6:11 PM CDT, 4 hours 57 minutes before

Area Forecast Discussion
National Weather Service Omaha/Valley NE
611 PM CDT Thu May 19 2022

...Updated for 00Z Aviation Forecast Discussion...

.DISCUSSION...
Issued at 319 PM CDT Thu May 19 2022

Warm and windy across the area this afternoon with southerly to
southwesterly winds gusting 30-35 mph in many locations and
temperatures as of 3 PM generally in the upper 80s to lower 90s.
Features of note included a surface low spinning over SD with an
attendant warm front stretching eastward into southern MN and cold
front southwestward into western NE, along with a "punch" of dry
air just ahead of the cold front.

As the cold front advances into the area this evening, should see
at least some shower and storm development along it, though still
lots of uncertainty regarding the spatial extent and strength of
any storms that do develop, with the main "deciding factor" being
moisture availability. OAX 18Z observed sounding did show quite a
bit of dry air through 500 mb, though surface observations did
show dewpoints 5 to 10 degrees higher just east into western IA.
CAM solutions show a wide range of possibilities for the forecast
area this evening, from the HRRR which has consistently shown next
to nothing (maybe some spotty light showers) to the NAM Nest
which depicts a line of storms moving across most of the area, so
confidence isn't particularly high on how things pan out.
Currently, thinking convergence along the boundary will be strong
enough for storms to develop in the area with decent enough shear,
mainly in the low levels, to yield some sort of storm
organization. With at least initially steep low level lapse rates
and linear storm structure, expect a damaging wind threat. Though
with storms likely forming in the evening, and the limited
moisture content leading to overall weaker storms, may be tough to
get any severe winds to the surface. So to summarize, thinking
we'll see at least some storm development in the forecast area by
6-7 PM, with a line forming, pushing southeast, and possibly
producing sporadic wind damage, though again, confidence is on the
lower side.

Behind the cold front, expect much cooler weather heading into
the weekend and early next week, with highs in the 60s most days.
Saturday looks to be the coolest, as highs look to struggle to get
out of the 50s. On top of that, some shortwave energy will likely
be sliding through the area and producing precip chances. So
expect a cool and possibly rainy Saturday (we're just the
messengers).

Those precip chances exit by Sunday as surface high pressure
takes over and gives us a dry day. However, the next precip
chances arrive for Monday into Tuesday as another shortwave trough
slides through the area. Models then diverge for the remainder of
the week with some guidance showing a larger scale trough digging
into the central CONUS and eventually cutting off (e.g. 19.12Z
GFS) and other guidance sweeping said trough quickly to the
eastern CONUS and building in upper level ridging (e.g. 19.12Z
ECMWF). The former solution would give us continued precip chances
and cooler weather while the latter would mean the area stays
largely dry and warms back up to near or above average
temperatures by Wednesday.

&&

.AVIATION...(For the 00Z TAFS through 00Z Friday evening)
Issued at 610 PM CDT Thu May 19 2022

Some uncertainty on storm coverage this evening as frontal
boundary pushes through and winds shift to northwest then north.
Expect some gusts around 30 knots or more behind the front. As for
TSRA, generally have highest confidence in some storms affecting
KOMA but did not include a prevailing group, just used VCTS. Will
amend if storms develop and it seems like they will affect any of
the sites.

&&

.OAX WATCHES/WARNINGS/ADVISORIES...
NE...None.
IA...None.
&&

DISCUSSION...CA
AVIATION...Miller

Hazardous weather outlook, May 19, 8:20 PM CDT, 2 hours 48 minutes before

Hazardous Weather Outlook
National Weather Service Omaha/Valley NE
820 PM CDT Thu May 19 2022

IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034-
042>045-050>053-065>068-078-088>093-201530-
Monona-Harrison-Shelby-Pottawattamie-Mills-Montgomery-Fremont-
Page-Knox-Cedar-Thurston-Antelope-Pierce-Wayne-Boone-Madison-
Stanton-Cuming-Burt-Platte-Colfax-Dodge-Washington-Butler-
Saunders-Douglas-Sarpy-Seward-Lancaster-Cass-Otoe-Saline-
Jefferson-Gage-Johnson-Nemaha-Pawnee-Richardson-
820 PM CDT Thu May 19 2022

This Hazardous Weather Outlook is for portions of southwest
Iowa...west central Iowa...east central Nebraska...northeast
Nebraska and southeast Nebraska.

.DAY ONE...Tonight and Friday

A few severe thunderstorms may develop before 2 am Friday across
portions of eastern Nebraska and southwest Iowa. If storms occur,
they could produce large hail and damaging winds.

.DAYS TWO THROUGH SEVEN...Friday night through Thursday

A few thunderstorms may occur Friday night and then again Monday.
Severe storms are not expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected to be needed.

In the hours before

Special weather statement, May 19, 9:27 PM CDT, 1 hour 41 minutes before

Special Weather Statement
National Weather Service Omaha/Valley Nebraska
927 PM CDT Thu May 19 2022

NEZ015-034-200245-
Thurston NE-Burt NE-
927 PM CDT Thu May 19 2022

...Strong thunderstorms will impact portions of central Burt and
southeastern Thurston Counties through 945 PM CDT...

At 927 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 4 miles southeast of Rosalie to 2 miles
northwest of Craig. Movement was northeast at 45 mph.

HAZARD...Winds in excess of 40 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Strong thunderstorms will be near...
  Decatur around 940 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until 300 AM CDT for
west central Iowa...and northeastern and east central Nebraska.

&&

LAT...LON 4211 9629 4208 9627 4205 9628 4204 9626
      4204 9625 4201 9623 4201 9625 4199 9623
      4200 9622 4183 9612 4174 9646 4203 9655
TIME...MOT...LOC 0227Z 236DEG 38KT 4201 9646 4181 9640

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...40 MPH

DeWald

Local storm report, May 19, 9:32 PM CDT, 1 hour 36 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
932 PM CDT THU MAY 19 2022

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0900 PM     TSTM WND GST     WEST POINT              41.84N 96.71W
05/19/2022  E50 MPH          CUMING             NE   LAW ENFORCEMENT

            ALSO 1/2 INCH HAIL REPORTED BY THE PUBLIC.

&&

Special weather statement, May 19, 9:47 PM CDT, 1 hour 21 minutes before

Special Weather Statement
National Weather Service Omaha/Valley Nebraska
947 PM CDT Thu May 19 2022

IAZ043-055-NEZ015-034-200315-
Monona IA-Harrison IA-Thurston NE-Burt NE-
947 PM CDT Thu May 19 2022

...Strong thunderstorms will impact portions of Monona, northwestern
Harrison, northeastern Burt and east central Thurston Counties
through 1015 PM CDT...

At 947 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 5 miles north of Decatur to 4 miles southwest
of Little Sioux. Movement was east at 45 mph.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Strong thunderstorms will be near...
  Whiting and Little Sioux around 950 PM CDT.
  Onawa and Pisgah around 1000 PM CDT.

Other locations in the path of these storms include Moorhead, Castana
and Mapleton.

This includes Interstate 29 between mile markers 92 and 122.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until 300 AM CDT for
southwestern and west central Iowa...and northeastern and east
central Nebraska.

&&

LAT...LON 4182 9568 4173 9610 4214 9634 4222 9608
      4219 9569
TIME...MOT...LOC 0247Z 251DEG 38KT 4209 9625 4178 9611

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

DeWald

Local storm report, May 19, 9:48 PM CDT, 1 hour 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
948 PM CDT THU MAY 19 2022

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0933 PM     TSTM WND GST     2 ESE TEKAMAH           41.76N 96.18W
05/19/2022  M53 MPH          BURT               NE   ASOS

&&

Special weather statement, May 19, 10:15 PM CDT, 53 minutes before

Special Weather Statement
National Weather Service Omaha/Valley NE
1015 PM CDT Thu May 19 2022

IAZ055-056-069-079-NEZ045-050>053-065>067-078-200415-
Harrison-Shelby-Pottawattamie-Mills-Washington-Butler-Saunders-
Douglas-Sarpy-Seward-Lancaster-Cass-Saline-
Including the cities of Missouri Valley, Woodbine, Logan, Dunlap,
Harlan, Council Bluffs, Glenwood, Blair, David City, Wahoo,
Ashland, Yutan, Omaha, Bellevue, Papillion, La Vista, Seward,
Milford, Lincoln, Plattsmouth, Crete, and Wilber
1015 PM CDT Thu May 19 2022

...Strong Cold Front Causing Gusty Winds and Some Blowing Dust...

A strong cold front working its way south across the region will
be ushering in a sharp switch in winds to the northwest, with
gusts over 45 to 55 mph likely for at least a brief period of
time. These stronger winds along this front are causing some
blowing dust across the area, which could cause reductions in
visibility.

DeWald

Local storm report, May 19, 10:25 PM CDT, 43 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
1025 PM CDT THU MAY 19 2022

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1011 PM     NON-TSTM WND GST 1 WNW VALLEY            41.32N 96.37W
05/19/2022  M54 MPH          DOUGLAS            NE   OFFICIAL NWS OBS

            AT THE NWS OFFICE. ASSOCIATED WITH THE COLD
            FRONT MOVING INTO THE AREA.

&&

The office that day

Everything else NWS Omaha, NE issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 19, 9:47 PM CDT	Special Weather Statement	OAX	Monona	28 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2022 Every severe thunderstorm warning in 2022

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.