Alert archive / Iowa / Severe Thunderstorm Warnings in 2019
Severe Thunderstorm Warning 248, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Oct 1, 2019, 5:10 PM CDT for 4 counties in Iowa. It was in force for 50 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Oct 1, 2019, 5:10 PM CDT (22:10 UTC)
- Expired
- Oct 1, 2019, 6:00 PM CDT
- In force
- 50 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 1.25 in
- Wind
- 60.0 mph
Counties Adair County, IA, Clarke County, IA, Madison County, IA, Union County, IA
The radar
The Des Moines radar (KDMX), 70 km from the middle of the area, began a volume at 22:09 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 |
|---|---|---|---|
| Oct 1, 2:45 PM CDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 10.2 hours before the alert went out and 188 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
- 389 J/kg
- Mixed-layer CIN
- -138 J/kg
- Mixed-layer LCL
- 691 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 226 m²/s²
- 0-3 km storm-relative helicity
- 238 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.7
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 Des Moines, IA wrote its last area forecast discussion before this severe thunderstorm warning went out at Oct 1, 3:00 PM CDT, 2 hours 10 minutes earlier.
Area forecast discussion, Oct 1, 3:00 PM CDT, 2 hours 10 minutes before
Area Forecast Discussion National Weather Service Des Moines IA 300 PM CDT Tue Oct 1 2019 .DISCUSSION.../Tonight through Tuesday/ Issued at 300 PM CDT Tue Oct 1 2019 Abbreviated discussion with convection now intensifying and tornado watch in place. Surface boundary is currently stalled across central Iowa and over the Des Moines metro area. This boundary is quite shallow and is beginning to lift slowly back to the north as the next surge of theta-e advection arrives and large scale overrunning occurs with the 850 mb boundary lagging well behind over northwest IA. The primary concern is an initial tornado threat near the boundary where increasing low level shear and good vortex stretching potential is in place with 0-3 km CAPE values near 200 J/kg. In addition, these more organized cells will have the capability of very heavy rainfall with PWAT values in excess of 2 inches and warm cloud depths near 14.7 kft. Lesser activity produced 1.75 inches of rain over northern Iowa this morning in 45 minutes. These concerns are amplified considering the Des Moines metro is with in the threat region. The greatest threat period will be through 8 pm with the severe weather threat. The greatest rainfall band of 3 to 5 inches with potential higher amounts may occur across portions of Marion, Warren, Madison, Polk and Jasper counties. The activity will diminish by mid to late evening and eventually evolve into a light rain/drizzle and possibly local fog event overnight into Wednesday morning. Another round of showers and storms are possible by Wednesday afternoon as the primary short wave lifts through the region. High pressure will arrive Thursday into early Friday. Still monitoring the potential for some frost Thursday night and will focus on this region more once the current weather passes. The next round of storms arrives late Friday into Saturday as return flow arrives. High pressure will again follow with cooler and drier conditions to follow into early next week. && .AVIATION.../For the 18Z TAFS through 18Z Wednesday afternoon/ Issued at 1239 PM CDT Tue Oct 1 2019 Thunderstorms will become widespread later this afternoon and evening before diminishing from north to south overnight. In addition, widespread IFR/LIFR cigs will spread over the state along with lower vsbys due to fog with likley periods of light precipitation persisting into Wed morning. Boundary over central Iowa will settle south overnight as well with all locations switching to a northerly wind. && .HYDROLOGY... Issued at 300 PM CDT Tue Oct 1 2019 Reference Discussion section for heavy rain forecast thoughts. Expect flash flooding potential especially in urban areas later this afternoon and early evening with heavy rainfall rates expected. Latest RFC forecasts are maintaining mainstem streams below flood stage. That still may change locally in areas downstream of heavier rainfall. && .DMX WATCHES/WARNINGS/ADVISORIES... Flash Flood Watch through Wednesday morning for IAZ004>007- 015>017-023>028-033>039-044>050-057>062-070>075-081>086-092>096. && DISCUSSION...Donavon AVIATION...Donavon
Hazardous weather outlook, Oct 1, 3:03 PM CDT, 2 hours 7 minutes before
Hazardous Weather Outlook National Weather Service Des Moines IA 303 PM CDT Tue Oct 1 2019 IAZ048>050-057>062-070>075-081>086-092>096-022015- 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- 303 PM CDT Tue Oct 1 2019 This Hazardous Weather Outlook is for portions of central Iowa. .DAY ONE...This afternoon and tonight A Flash Flood Watch and River Flood Watches are in effect for portions of the area. Please refer to the National Weather Service website at weather.gov/desmoines for further details. A few strong thunderstorms will be possible through this evening. Hail or gusty winds are the main threats along with isolated tornadoes. Torrential rainfall and the potential for flash flooding are also possible. .DAYS TWO THROUGH SEVEN...Wednesday through Monday A few thunderstorms will be possible late Friday into Saturday. The severe threat is low at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed this afternoon and tonight. IAZ097-022015- Davis- 303 PM CDT Tue Oct 1 2019 This Hazardous Weather Outlook is for portions of central Iowa. .DAY ONE...This afternoon and tonight There is a slight risk of severe storms for this afternoon into tonight. Large hail, damaging wind or an isolated tornado will all be possible. Locally heavy rainfall is also possible. .DAYS TWO THROUGH SEVEN...Wednesday through Monday A few thunderstorms will be possible late Friday into Saturday. The severe threat is low at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed this afternoon and tonight. IAZ004>007-015>017-023>028-033>039-044>047-022015- Emmet-Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo- Pocahontas-Humboldt-Wright-Franklin-Butler-Bremer-Sac-Calhoun- Webster-Hamilton-Hardin-Grundy-Black Hawk-Crawford-Carroll-Greene- Boone- 303 PM CDT Tue Oct 1 2019 This Hazardous Weather Outlook is for portions of central Iowa. .DAY ONE...This afternoon and tonight A Flash Flood Watch and River Flood Watches are in effect for portions of the area. Please refer to the National Weather Service website at weather.gov/desmoines for further details. A few strong thunderstorms will be possible through this evening. Hail or gusty winds are the main threats along with isolated tornadoes. Torrential rainfall and the potential for flash flooding are also possible. .DAYS TWO THROUGH SEVEN...Wednesday through Monday A few thunderstorms will be possible late Friday into Saturday. The severe threat is low at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed today into tonight.
In the hours before
Local storm report, Oct 1, 4:11 PM CDT, 59 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
411 PM CDT TUE OCT 1 2019
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0405 PM HAIL ORIENT 41.20N 94.42W
10/01/2019 E1.00 INCH ADAIR IA PUBLIC
DIME TO QUARTER SIZED HAIL, SMALL TWIGS
BROKEN IN STREET.
&&Local storm report, Oct 1, 4:19 PM CDT, 51 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
419 PM CDT TUE OCT 1 2019
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0412 PM HAIL 3 ENE ORIENT 41.22N 94.36W
10/01/2019 E1.75 INCH ADAIR IA TRAINED SPOTTER
&&Local storm report, Oct 1, 5:01 PM CDT, 9 minutes before
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</html>The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 1, 2:08 AM CDT | Special Weather Statement | DMX | Sac | 22 min |
| Oct 1, 2:38 AM CDT | Severe Thunderstorm Warning | DMX | Palo Alto, Pocahontas | 14 min |
| Oct 1, 3:18 AM CDT | Special Weather Statement | DMX | Humboldt | 27 min |
| Oct 1, 6:25 AM CDT | Special Weather Statement | DMX | Cerro Gordo | 35 min |
| Oct 1, 7:18 AM CDT | Special Weather Statement | DMX | Cerro Gordo | 42 min |
| Oct 1, 3:53 PM CDT | Severe Thunderstorm Warning | DMX | Adair, Adams, Madison, Union | 52 min |
| Oct 1, 4:20 PM CDT | Tornado Warning | DMX | Adair, Madison, Union | 40 min |
| Oct 1, 4:37 PM CDT | Severe Thunderstorm Warning | DMX | Adair, Adams, Cass, Union | 53 min |
| Oct 1, 4:58 PM CDT | Tornado Warning | DMX | Dallas, Madison, Polk, Warren | 32 min |
| Oct 1, 5:18 PM CDT | Severe Thunderstorm Warning | DMX | Jasper, Polk, Warren | 42 min |
| Oct 1, 5:25 PM CDT | Severe Thunderstorm Warning | DMX | Adair, Adams | 24 min |
| Oct 1, 5:41 PM CDT | Special Weather Statement | DMX | Polk | 64 min |
| Oct 1, 5:44 PM CDT | Severe Thunderstorm Warning | DMX | Jasper, Marshall | 46 min |
| Oct 1, 5:53 PM CDT | Severe Thunderstorm Warning | DMX | Black Hawk, Bremer | 31 min |
| Oct 1, 5:53 PM CDT | Tornado Warning | DMX | Jasper | 38 min |
| Oct 1, 6:43 PM CDT | Severe Thunderstorm Warning | DMX | Poweshiek, Tama | 47 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 2019Every severe thunderstorm warning in 2019
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.