Alert archive / Iowa / Severe Thunderstorm Warnings in 2019
Severe Thunderstorm Warning 142, NWS Quad Cities, IA
NWS Quad Cities, IA issued this severe thunderstorm warning at Sep 12, 2019, 4:50 PM CDT for Buchanan County, Delaware County, Linn County, Iowa. It was in force for 40 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
- Sep 12, 2019, 4:50 PM CDT (21:50 UTC)
- Expired
- Sep 12, 2019, 5:30 PM CDT
- In force
- 40 min
- Issued by
- NWS Quad Cities, IA
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Buchanan County, IA, Delaware County, IA, Linn County, IA
The radar
The Quad Cities radar (KDVN), 117 km from the middle of the area, began a volume at 21:52 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 |
|---|---|---|---|
| Sep 12, 3:40 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 9.8 hours before the alert went out and 121 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
- 1327 J/kg
- Mixed-layer CIN
- -55 J/kg
- Mixed-layer LCL
- 805 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 61 m²/s²
- 0-3 km storm-relative helicity
- 73 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.1
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 Quad Cities, IA wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 12, 1:59 PM CDT, 2 hours 51 minutes earlier.
Area forecast discussion, Sep 12, 1:59 PM CDT, 2 hours 51 minutes before
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</html>Hazardous weather outlook, Sep 12, 4:26 AM CDT, 12 hours 24 minutes before
Hazardous Weather Outlook National Weather Service Quad Cities IA IL 426 AM CDT Thu Sep 12 2019 IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007- 009-015>018-024>026-034-035-MOZ009-010-130930- Buchanan-Delaware-Dubuque-Benton-Linn-Jones-Jackson-Iowa-Johnson- Cedar-Clinton-Muscatine-Scott-Keokuk-Washington-Louisa-Jefferson- Henry IA-Des Moines-Van Buren-Lee-Jo Daviess-Stephenson-Carroll- Whiteside-Rock Island-Henry IL-Bureau-Putnam-Mercer-Henderson- Warren-Hancock-McDonough-Scotland-Clark- 426 AM CDT Thu Sep 12 2019 This Hazardous Weather Outlook is for portions of north central Illinois...northwest Illinois...west central Illinois...east central Iowa...northeast Iowa...southeast Iowa and northeast Missouri. .DAY ONE...TODAY AND TONIGHT This afternoon and evening: The Storm Prediction Center has a slight risk for severe thunderstorms across the entire outlook area. A strong cold front will sweep a line of thunderstorms, some possibly severe, across the outlook area. The main risk will be damaging winds and possible large hail. However, a stalled boundary in eastern Iowa may serve as a focus for discrete supercells which may produce tornadoes. This risk is greatest north of Interstate 80 in eastern Iowa. In addition: due to the intense rainfall rates that will accompany these storms, there is the potential for flash flooding especially along the Highway 20 corridor in Iowa and Illinois. This area has received several inches of rain in the past week and is the most vulnerable to flash flooding. A flash flood watch is in effect through this evening for that area. Heat index values in the lower to mid 90s can be expected this afternoon mainly along and south of Interstate 80. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY Friday: West winds will gust up to 35 mph especially north of Interstate 80. Saturday night: Scattered thunderstorms are expected to develop as a warm front returns to the area. The Storm Prediction Center has a marginal risk for severe storms in eastern Iowa, northwest of a Dubuque to Sigourney line. .SPOTTER INFORMATION STATEMENT... Spotter and amateur radio activation may be needed this afternoon and evening. Haase
In the hours before
Local storm report, Sep 12, 12:00 PM CDT, 4 hours 50 minutes before
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</html>Special weather statement, Sep 12, 12:43 PM CDT, 4 hours 7 minutes before
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</html>Special weather statement, Sep 12, 4:35 PM CDT, 15 minutes before
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</html>Local storm report, Sep 12, 4:43 PM CDT, 7 minutes before
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</html>Local storm report, Sep 12, 4:47 PM CDT, 3 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
447 PM CDT THU SEP 12 2019
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0442 PM TSTM WND GST 1 N INDEPENDENCE 42.49N 91.89W
09/12/2019 E50 MPH BUCHANAN IA TRAINED SPOTTER
SUSTAINED AT 45 MPH FOLLOWING THE GUST.
&&The office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 11, 7:11 PM CDT | Severe Thunderstorm Warning | DVN | Dubuque, Jackson, Jones | 34 min |
| Sep 11, 7:40 PM CDT | Special Weather Statement | DVN | Jackson | 50 min |
| Sep 11, 10:08 PM CDT | Flash Flood Warning | DVN | Dubuque | 6 hr |
| Sep 11, 11:38 PM CDT | Flash Flood Warning | DVN | Dubuque | 5 hr |
| Sep 12, 1:46 AM CDT | Flash Flood Watch | DVN | Buchanan, Delaware, Dubuque | 23 hr |
| Sep 12, 4:35 PM CDT | Special Weather Statement | DVN | Linn | 25 min |
| Sep 12, 4:45 PM CDT | Special Weather Statement | DVN | Buchanan | 30 min |
| Sep 12, 6:06 PM CDT | Special Weather Statement | DVN | Jones | 39 min |
| Sep 12, 6:19 PM CDT | Severe Thunderstorm Warning | DVN | Cedar, Johnson, Jones, Linn | 41 min |
| Sep 11, 7:50 PM CDT | Special Weather Statement | DVN | Jo Daviess | 40 min |
| Sep 11, 8:28 PM CDT | Special Weather Statement | DVN | Stephenson | 47 min |
| Sep 11, 8:31 PM CDT | Special Weather Statement | DVN | Carroll | 44 min |
| Sep 11, 10:56 PM CDT | Flash Flood Warning | DVN | Stephenson | 5 hr |
| Sep 11, 11:44 PM CDT | Flash Flood Warning | DVN | Stephenson | 2 hr |
| Sep 12, 10:02 AM CDT | River Flood Warning | DVN | Stephenson | 39 days |
| Sep 12, 12:43 PM CDT | Special Weather Statement | DVN | Carroll | 32 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.