Alert archive / Iowa / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 104, NWS Quad Cities, IA

August 26, 2021Jefferson County, Washington County, Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at Aug 26, 2021, 10:57 PM CDT for Jefferson County, Washington County, Iowa. It was in force for 48 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: Aug 26, 2021, 10:57 PM CDT (03:57 UTC)
Expired: Aug 26, 2021, 11:45 PM CDT
In force: 48 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Damage threat: Considerable
Hail: 1.75 in
Wind: 70.0 mph

Counties Jefferson County, IA, Washington County, IA

The radar

The Quad Cities radar (KDVN), 129 km from the middle of the area, began a volume at 03:57 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
Aug 26, 11:35 PM CDT	TSTM WND GST 60	3 Se Rubio, IA	MEASURED AT LAKE DARLING STATE PARK.

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

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 4.0 hours before the alert went out and 135 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: 673 J/kg
Mixed-layer CIN: -189 J/kg
Mixed-layer LCL: 1469 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: -106 m²/s²
0-3 km storm-relative helicity: -64 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -1.7

Open this sounding in Storm Lab

The text

As transmitted.

638 
WUUS53 KDVN 270357
SVRDVN
IAC101-183-270445-
/O.NEW.KDVN.SV.W.0104.210827T0357Z-210827T0445Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Quad Cities IA/IL
1057 PM CDT Thu Aug 26 2021

The National Weather Service in the Quad Cities has issued a

* Severe Thunderstorm Warning for...
  Southwestern Washington County in southeastern Iowa...
  Jefferson County in southeastern Iowa...

* Until 1145 PM CDT.

* At 1057 PM CDT, severe thunderstorms were located along a line
  extending from near Harper to near Packwood to 6 miles east of
  Ottumwa, moving southeast at 20 mph.

  HAZARD...Golf ball size hail and 70 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           considerable tree damage. Wind damage is also likely to 
           mobile homes, roofs, and outbuildings.

* Severe thunderstorms will be near...
  Packwood and Abingdon around 1105 PM CDT.
  Batavia around 1115 PM CDT.

Other locations in the path of these severe thunderstorms include
Maharishi Vedic City, Fairfield, Libertyville, Brighton and Pleasant
Plain.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These storms are producing destructive winds and large damaging hail.
SEEK SHELTER NOW inside a sturdy structure and stay away from
windows!
 
Continuous cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4116 9195 4117 9194 4138 9194 4126 9173
      4098 9189 4090 9204 4090 9217 4116 9218
TIME...MOT...LOC 0357Z 321DEG 19KT 4132 9201 4117 9210 4104 9231 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...OBSERVED
MAX HAIL SIZE...1.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...70 MPH

$$

Gibbs

2 follow-up statements

636 
WWUS53 KDVN 270411
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
1111 PM CDT Thu Aug 26 2021

IAC101-183-270445-
/O.CON.KDVN.SV.W.0104.000000T0000Z-210827T0445Z/
Washington IA-Jefferson IA-
1111 PM CDT Thu Aug 26 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1145 PM CDT
FOR SOUTHWESTERN WASHINGTON AND JEFFERSON COUNTIES...

At 1110 PM CDT, severe thunderstorms were located along a line
extending from 6 miles north of Richland to Packwood to near Batavia,
moving southeast at 20 mph.

HAZARD...Golf ball size hail and 70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect 
         considerable tree damage. Wind damage is also likely to 
         mobile homes, roofs, and outbuildings.

Locations impacted include...
  Batavia, Maharishi Vedic City, Fairfield, Brighton, Libertyville 
  and Pleasant Plain.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These storms are producing destructive winds and large damaging hail.
SEEK SHELTER NOW inside a sturdy structure and stay away from
windows.
 
Continuous cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4116 9195 4117 9194 4138 9194 4126 9173
      4098 9189 4090 9204 4090 9217 4116 9218
TIME...MOT...LOC 0410Z 321DEG 19KT 4127 9196 4112 9205 4099 9226 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...OBSERVED
MAX HAIL SIZE...1.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...70 MPH

$$

Gibbs

092 
WWUS53 KDVN 270415
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
1115 PM CDT Thu Aug 26 2021

IAC101-183-270445-
/O.CON.KDVN.SV.W.0104.000000T0000Z-210827T0445Z/
Washington IA-Jefferson IA-
1115 PM CDT Thu Aug 26 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1145 PM CDT
FOR SOUTHWESTERN WASHINGTON AND JEFFERSON COUNTIES...

At 1115 PM CDT, severe thunderstorms were located along a line
extending from near Richland to near Maharishi Vedic City to near
Batavia, moving southeast at 20 mph.

HAZARD...Golf ball size hail and 70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect 
         considerable tree damage. Wind damage is also likely to 
         mobile homes, roofs, and outbuildings.

Locations impacted include...
Fairfield, Batavia, Libertyville, Maharishi Vedic City, Packwood,
Pleasant Plain, Abingdon, Fairfield Municipal Airport, Perlee, Linby,
East Pleasant Plain, Jefferson County Fairgrounds, Jefferson County
Park, Brookville, Lake Darling State Park and Rubio.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These storms are producing destructive winds and large damaging hail.
SEEK SHELTER NOW inside a sturdy structure and stay away from
windows.
 
Continuous cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4116 9195 4117 9194 4124 9194 4112 9181
      4098 9189 4090 9204 4090 9217 4116 9218
TIME...MOT...LOC 0415Z 321DEG 19KT 4125 9194 4110 9203 4097 9224 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...OBSERVED
MAX HAIL SIZE...1.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...70 MPH

$$

Gibbs

The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 26, 8:23 PM CDT	Special Weather Statement	DVN	Benton	52 min
Aug 26, 9:21 PM CDT	Severe Thunderstorm Warning	DVN	Iowa, Keokuk	39 min
Aug 26, 9:58 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Keokuk	47 min
Aug 26, 10:29 PM CDT	Flash Flood Warning	DVN	Keokuk	4 hr
Aug 26, 10:43 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Keokuk, Washington	47 min
Aug 26, 11:20 PM CDT	Tornado Warning	DVN	Jefferson, Keokuk	27 min
Aug 26, 11:39 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Jefferson, Washington	31 min
Aug 27, 1:34 PM CDT	Heat Advisory	DVN	Lee	29 hr
Aug 27, 3:07 PM CDT	Heat Advisory	DVN	Des Moines, Henry, Van Buren	28 hr

Nearby

Severe Thunderstorm Warnings in Iowa, 2021 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.