Alert archive / Iowa / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 144, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jun 11, 2018, 8:51 PM CDT for 4 counties in Iowa. It was in force for 54 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
- Jun 11, 2018, 8:51 PM CDT (01:51 UTC)
- Expired
- Jun 11, 2018, 9:45 PM CDT
- In force
- 54 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Adams County, IA, Ringgold County, IA, Taylor County, IA, Union County, IA
The radar
The Des Moines radar (KDMX), 127 km from the middle of the area, began a volume at 01:51 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.
Did it verify
Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.
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 |
|---|---|---|---|
| Jun 11, 3:42 PM CDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 1.9 hours before the alert went out and 160 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
- 562 J/kg
- Mixed-layer CIN
- -153 J/kg
- Mixed-layer LCL
- 1301 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 52 m²/s²
- 0-3 km storm-relative helicity
- 117 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.0
The text
As transmitted.
116 WUUS53 KDMX 120151 SVRDMX IAC003-159-173-175-120245- /O.NEW.KDMX.SV.W.0144.180612T0151Z-180612T0245Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Des Moines IA 851 PM CDT MON JUN 11 2018 The National Weather Service in Des Moines has issued a * Severe Thunderstorm Warning for... Western Union County in south central Iowa... Adams County in southwestern Iowa... Western Ringgold County in south central Iowa... Taylor County in southwestern Iowa... * Until 945 PM CDT. * At 851 PM CDT, severe thunderstorms were located along a line extending from Lake Icaria to near Bedford, moving east at 20 mph. HAZARD...60 mph wind gusts and penny size hail. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. * Locations impacted include... Creston, Corning, Bedford, Lenox, Green Valley Lake, Lake Icaria, Clearfield, Diagonal, Prescott, Blockton, Gravity, Cromwell, Sharpsburg, Redding, Kent, Conway, Benton, Maloy, Delphos and Athelstan. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && A Tornado Watch remains in effect until 1100 PM CDT for south central and southwestern Iowa. LAT...LON 4057 9478 4112 9478 4116 9431 4057 9432 TIME...MOT...LOC 0151Z 263DEG 19KT 4106 9469 4059 9470 HAIL...0.75IN WIND...60MPH $$ Ansorge
2 follow-up statements
215 WWUS53 KDMX 120222 SVSDMX Severe Weather Statement National Weather Service Des Moines IA 922 PM CDT MON JUN 11 2018 IAC003-159-173-175-120245- /O.CON.KDMX.SV.W.0144.000000T0000Z-180612T0245Z/ Union IA-Adams IA-Ringgold IA-Taylor IA- 922 PM CDT MON JUN 11 2018 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM CDT FOR WESTERN UNION...ADAMS...WESTERN RINGGOLD AND TAYLOR COUNTIES... At 922 PM CDT, severe thunderstorms were located along a line extending from 8 miles west of Green Valley Lake to near Athelstan, moving east at 15 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. Locations impacted include... Creston, Corning, Bedford, Lenox, Green Valley Lake, Lake Icaria, Clearfield, Diagonal, Prescott, Blockton, Gravity, Cromwell, Sharpsburg, Redding, Kent, Conway, Benton, Maloy, Delphos and Athelstan. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && A Tornado Watch remains in effect until 1100 PM CDT for south central and southwestern Iowa. LAT...LON 4057 9478 4112 9478 4116 9431 4057 9432 TIME...MOT...LOC 0222Z 261DEG 15KT 4108 9455 4061 9456 HAIL...<.75IN WIND...60MPH $$ Ansorge
777
WWUS53 KDMX 120236
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
936 PM CDT MON JUN 11 2018
IAC003-159-173-175-120245-
/O.EXP.KDMX.SV.W.0144.000000T0000Z-180612T0245Z/
Union IA-Adams IA-Ringgold IA-Taylor IA-
936 PM CDT MON JUN 11 2018
...THE SEVERE THUNDERSTORM WARNING FOR WESTERN UNION...ADAMS...
WESTERN RINGGOLD AND TAYLOR COUNTIES WILL EXPIRE AT 945 PM CDT...
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However gusty
winds are still possible with these thunderstorms.
A Tornado Watch remains in effect until 1100 PM CDT for south central
and southwestern Iowa.
LAT...LON 4057 9478 4112 9478 4116 9431 4057 9432
TIME...MOT...LOC 0235Z 263DEG 19KT 4109 9446 4062 9447
$$
AnsorgeWhat 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 Des Moines, IA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 11, 6:43 PM CDT, 2 hours 8 minutes earlier.
Area forecast discussion, Jun 11, 6:43 PM CDT, 2 hours 8 minutes before
Area Forecast Discussion National Weather Service Des Moines IA 643 PM CDT Mon Jun 11 2018 .SHORT TERM.../Tonight through Tuesday/ Issued at 336 PM CDT Mon Jun 11 2018 Strong to severe thunderstorm development along with very heavy rain were the main focus of the forecast today into this evening across the western portion of the CWA. Leaned toward a blend of the latest HRRR/ESRL HRRR and RAP for timing of convection into the western edges of the CWA this afternoon into tonight. A warm front extended south-southeast from a surface low in southeast SD before extending more eastern over far southern Iowa with a sharp cold front cutting south across eastern Nebraska into Kansas will be the focus of severe weather later today. A few storms continue to fester along the warm front from around Atlantic to Winterset, but remain sub-severe attm. In the warm sector over southwest to western Iowa, very moist and unstable atmosphere as surface temps in the lower 90s and surface dew points in the lower 70s across this area. OAX 19z observed special sounding indicating a classic loaded gun sounding with a decent hodograph suggestion plenty of speed and direction shear in the lower levels. LCL heights range from around 500-1000m, steep low to mid-level lapse rates, very high surface based CAPE, and significant effective helicity ranging as high as 200 m2/s2 along and southwest of the warm front in southern Iowa. The helicity, along with high sigtor and supercell parameters, increases through the rest of the afternoon. Timing of severe convection into the CWA looks to be late in the day, more likely past 22z to 23z in the far west to southwest and possibly even later. Only concern is if current weak convection along the warm front releases an outflow boundary providing another trigger mechanism for storms to develop. The instability gradient follows along with the warm front orientation and any storms that develop are likely to follow this gradient into the southern portions of Iowa. Certainly concerned with the tornadic threat over the far west-central to southwest Iowa as well as the large hail and damaging wind threat through around 02-03z, but storms are anticipated to persist into the late evening. The other potential is very heavy rain with warm layer cloud depths topping out over 14kft and precipitable water values over 1.50 inches and weak Corfidi vectors nearly lined up with the storm motion tonight. Certainly some training is possible late tonight into the overnight hours as well as the very efficient rain producers leading to the potential for flash flooding. .LONG TERM.../Tuesday night through Monday/ Issued at 336 PM CDT Mon Jun 11 2018 Wednesday night into Thursday, a quick moving shortwave will bring another round of storms with heavy rain by the early morning hours Thursday. Certainly looking better potential for heavy rain event that severe weather potential with the timing of the convection into the CWA. Otherwise, the main focus of the extended period was on the hot and humid weather conditions late this week into the weekend. No significant change to the ongoing forecast with only a minor tweak to the maximum temperatures on Friday. With the recent rainfall and the crops likely in becoming fully mature, the added low level moisture into the atmosphere is concerning for the heat index values Friday through Sunday. Each day, heat index values top out over 100 degrees. && .AVIATION.../For the 00Z TAFS through 00Z Tuesday evening/ Issued at 644 PM CDT Mon Jun 11 2018 Main aviation concern will be with front moving across the state with widespread convection this evening. Will see restrictions to both ceilings and visibilities in and around the thunderstorms with general MVFR ceilings across much of the area otherwise. Will continue to see MVFR to IFR ceilings late tonight into Tuesday morning before some improvement by afternoon as drier air enters the state from the northwest. && .DMX WATCHES/WARNINGS/ADVISORIES...NONE. && SHORT TERM...Podrazik LONG TERM...Podrazik AVIATION...Cogil
Hazardous weather outlook, Jun 11, 3:55 PM CDT, 4 hours 56 minutes before
Hazardous Weather Outlook National Weather Service Des Moines IA 355 PM CDT Mon Jun 11 2018 IAZ004>007-015>017-023>026-033>038-044>050-057>062-070>075- 081>086-092>097-122100- Emmet-Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo- Pocahontas-Humboldt-Wright-Franklin-Sac-Calhoun-Webster-Hamilton- Hardin-Grundy-Crawford-Carroll-Greene-Boone-Story-Marshall-Tama- Audubon-Guthrie-Dallas-Polk-Jasper-Poweshiek-Cass-Adair-Madison- Warren-Marion-Mahaska-Adams-Union-Clarke-Lucas-Monroe-Wapello- Taylor-Ringgold-Decatur-Wayne-Appanoose-Davis- 355 PM CDT Mon Jun 11 2018 This Hazardous Weather Outlook is for portions of central Iowa. .DAY ONE...This afternoon and tonight Scattered thunderstorms are expected to redevelop late this afternoon into tonight. A few severe storms may occur with large hail and damaging winds possible along with an isolated tornado. Heavy rainfall could occur with any storms. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday Scattered storms are possible at times from Wednesday night through Friday night. The best chance will be Wednesday night into Thursday morning. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed this afternoon and tonight. IAZ027-028-039-122100- Butler-Bremer-Black Hawk- 355 PM CDT Mon Jun 11 2018 This Hazardous Weather Outlook is for portions of central Iowa. .DAY ONE...This afternoon and tonight Scattered thunderstorms are possible tonight. A few severe storms may occur with large hail and damaging winds possible. Heavy rainfall could occur with any storms. River Flood Warnings are in effect along the Shell Rock and Cedar River basins. Please refer to our website at weather.gov/desmoines for further details. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday Scattered storms are possible at times from Wednesday night through Friday night. The best chance will be Wednesday night into Thursday morning. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed today. FOWLE
In the hours before
Local storm report, Jun 11, 8:41 PM CDT, 10 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
841 PM CDT MON JUN 11 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0830 PM TSTM WND GST 9 SW BEDFORD 40.59N 94.87W
06/11/2018 E70 MPH TAYLOR IA TRAINED SPOTTER
&&
FOWLELocal storm report, Jun 11, 8:42 PM CDT, 9 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
842 PM CDT MON JUN 11 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0821 PM TSTM WND GST 4 N NEW MARKET 40.79N 94.90W
06/11/2018 E65 MPH TAYLOR IA LAW ENFORCEMENT
COUNTY SHERIFF RECEIVED REPORT OF 60 TO 70
MPH WINDS ABOUT 4 MILES NORTH OF NEW MARKET.
TIME ESTIMATED FROM RADAR.
&&Local storm report, Jun 11, 8:47 PM CDT, 4 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
847 PM CDT MON JUN 11 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0835 PM HAIL 2 W ROCKWELL CITY 42.40N 94.67W
06/11/2018 E1.00 INCH CALHOUN IA PUBLIC
LARGEST HAILSTONES WERE QUARTER SIZED.
&&
FOWLEThe office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 11, 7:09 PM CDT | Severe Thunderstorm Warning | DMX | Crawford | 36 min |
| Jun 11, 7:40 PM CDT | Severe Thunderstorm Warning | DMX | Crawford, Sac | 35 min |
| Jun 11, 7:57 PM CDT | Severe Thunderstorm Warning | DMX | Taylor | 63 min |
| Jun 11, 8:01 PM CDT | Severe Thunderstorm Warning | DMX | Calhoun, Carroll, Sac | 28 min |
| Jun 11, 8:09 PM CDT | Severe Thunderstorm Warning | DMX | Adams | 51 min |
| Jun 11, 8:27 PM CDT | Severe Thunderstorm Warning | DMX | Calhoun | 32 min |
| Jun 11, 8:46 PM CDT | Severe Thunderstorm Warning | DMX | Boone, Calhoun, Greene, Webster | 44 min |
| Jun 11, 8:59 PM CDT | Severe Thunderstorm Warning | DMX | Calhoun, Humboldt, Pocahontas, Webster | 31 min |
| Jun 11, 9:14 PM CDT | Special Weather Statement | DMX | Clarke, Decatur, Ringgold, Union | 61 min |
| Jun 11, 9:28 PM CDT | Special Weather Statement | DMX | Dallas, Polk | 62 min |
| Jun 11, 10:03 PM CDT | Special Weather Statement | DMX | Clarke, Lucas, Wayne | 57 min |
| Jun 11, 10:07 PM CDT | Special Weather Statement | DMX | Jasper, Marion, Polk, Warren | 53 min |
| Jun 11, 10:26 PM CDT | Special Weather Statement | DMX | Story | 34 min |
| Jun 11, 11:04 PM CDT | Special Weather Statement | DMX | Mahaska, Marion, Monroe, Wapello | 56 min |
| Jun 12, 6:44 PM CDT | Special Weather Statement | DMX | Pocahontas | 61 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 2018Every severe thunderstorm warning in 2018
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.