Alert archive / Iowa / Tornado Warnings in 2007
Tornado Warning 20, NWS Quad Cities, IA
NWS Quad Cities, IA issued this tornado warning at Jul 16, 2007, 4:18 PM CDT for Johnson County, Iowa. It was in force for 42 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
- Jul 16, 2007, 4:18 PM CDT (21:18 UTC)
- Expired
- Jul 16, 2007, 5:00 PM CDT
- In force
- 42 min
- Issued by
- NWS Quad Cities, IA
- Area
- Counties, with a storm outline in the text
County Johnson County, IA
The radar
The Quad Cities radar (KDVN), 85 km from the middle of the area, began a volume at 21:21 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 |
|---|---|---|---|
| Jul 16, 4:30 PM CDT | HAIL 1.75 | Coralville, IA | HAIL REPORTED AT CORALVILLE MALL |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 16, 3:38 PM CDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 9.3 hours before the alert went out and 92 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1487 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 73 m²/s²
- 0-3 km storm-relative helicity
- 127 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WFUS53 KDVN 162118 TORDVN IAC103-162200- /O.NEW.KDVN.TO.W.0020.070716T2118Z-070716T2200Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE QUAD CITIES IA IL 418 PM CDT MON JUL 16 2007 THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A * TORNADO WARNING FOR... JOHNSON COUNTY IN EAST CENTRAL IOWA... * UNTIL 500 PM CDT. * AT 417 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A TORNADO NEAR TIFFIN...OR ABOUT 8 MILES WEST OF IOWA CITY...MOVING SOUTHEAST AT 15 MPH. * THE TORNADO WILL BE NEAR... CORALVILLE AND OAKDALE AROUND 425 PM CDT... UNIVERSITY HEIGHTS AROUND 435 PM CDT... IOWA CITY AROUND 440 PM CDT... HILLS AROUND 445 PM CDT... THIS INCLUDES INTERSTATE 80 IN IOWA BETWEEN MILE MARKERS 235 AND 252. THIS INCLUDES INTERSTATE 380 IN IOWA BETWEEN MILE MARKERS 1 AND 6. THE SAFEST PLACE TO BE IN A TORNADO IS IN A BASEMENT OR INTERIOR ROOM OR HALLWAY ON THE LOWEST FLOOR OF A BUILDING. A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT MONDAY EVENING FOR EASTERN IOWA. LAT...LON 4180 9173 4157 9175 4151 9140 4174 9141 $$ SHEETS
3 follow-up statements
000 WWUS53 KDVN 162128 SVSDVN SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE QUAD CITIES IA IL 425 PM CDT MON JUL 16 2007 IAC103-162200- /O.CON.KDVN.TO.W.0020.000000T0000Z-070716T2200Z/ JOHNSON IA- 425 PM CDT MON JUL 16 2007 ...A TORNADO WARNING REMAINS IN EFFECT UNTIL 500 PM CDT FOR JOHNSON COUNTY... AT 421 PM CDT...DOPPLER RADAR INDICATED A TORNADO APPROXAMATELY NEAR COSGROVE...OR ABOUT 8 MILES WEST OF IOWA CITY...MOVING SOUTH AT 15 MPH. THE TORNADO WILL BE NEAR... SHARON CENTER AROUND 430 PM CDT... THIS INCLUDES INTERSTATE 80 IN IOWA BETWEEN MILE MARKERS 235 AND 252. THIS INCLUDES INTERSTATE 380 BETWEEN MILE MARKERS 1 AND 6. THE SAFEST PLACE TO BE IN A TORNADO IS IN A BASEMENT OR INTERIOR ROOM OR HALLWAY ON THE LOWEST FLOOR OF A BUILDING. A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT MONDAY EVENING FOR EASTERN IOWA. IN ADDITION...A SEPARATE SEVERE STORM CAPABLE OF PRODUCING LARGE HAIL WAS LOCATED OVER NORTHWEST JOHNSON COUNTY...ABOUT 5 MILES NORTHEAST OF AMANAA. SEVERE THUNDERSTORMS OVER THE AREA WILL CONTINUE TO PRODUCE VERY HEAVY RAINFALL...RESULTING IN URBAN AND SMALL STREAM FLOODING. LAT...LON 4180 9173 4157 9175 4151 9140 4174 9141 $$ SHEETS
000 WWUS53 KDVN 162138 SVSDVN SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE QUAD CITIES IA IL 435 PM CDT MON JUL 16 2007 IAC103-162200- /O.CON.KDVN.TO.W.0020.000000T0000Z-070716T2200Z/ JOHNSON IA- 435 PM CDT MON JUL 16 2007 ...A TORNADO WARNING REMAINS IN EFFECT UNTIL 500 PM CDT FOR JOHNSON COUNTY... AT 435 PM CDT...DOPPLER RADAR CONTINUED TO INDICATE A POSSIBLE TORNADO NEAR SHARON CENTER...OR ABOUT 7 MILES SOUTHWEST OF IOWA CITY...MOVING SOUTHEAST AT 15 MPH. ALSO...AT 430 PM A TRAINED SPOTTER REPORTED GOLF BALL SIZED HAIL AT THE CORALVILLE MALL. THIS STORM HAS THE POTENTIAL TO PRODUCE VERY LARGE HAIL AND TORRENTIAL RAINFALL AS IT MOVES THROUGH THE CITIES OF IOWA CITY AND CORALVILLE THROUGH 5 PM. THE TORNADO WILL BE NEAR... HILLS AROUND 450 PM CDT... THIS INCLUDES INTERSTATE 80 IN IOWA BETWEEN MILE MARKERS 235 AND 252. THIS INCLUDES INTERSTATE 380 BETWEEN MILE MARKERS 1 AND 6. A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT MONDAY EVENING FOR EASTERN IOWA. LAT...LON 4180 9173 4157 9175 4151 9140 4174 9141 $$ SHEETS
000 WWUS53 KDVN 162159 SVSDVN SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE QUAD CITIES IA IL 458 PM CDT MON JUL 16 2007 IAC103-162208- /O.EXP.KDVN.TO.W.0020.000000T0000Z-070716T2200Z/ JOHNSON IA- 458 PM CDT MON JUL 16 2007 ...THE TORNADO WARNING FOR JOHNSON COUNTY EXPIRES AT 500 PM CDT... THE SEVERE THUNDERSTORM THAT WAS CAPABLE OF PRODUCING A TORNADO HAS WEAKENED AND MOVED OUT OF THE COUNTY. THEREFORE THE TORNADO WARNING HAS BEEN ALLOWED TO EXPIRE. HOWEVER...THIS STORM IS STILL CAPABLE OF PRODUCING TORRENTIAL RAINFALL AND A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1045 PM CDT FOR ALL OF JOHNSON COUNTY. A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT MONDAY EVENING FOR EASTERN IOWA. LAT...LON 4180 9173 4157 9175 4151 9140 4174 9141 $$ SHEETS
The office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 16, 3:27 PM CDT | Severe Thunderstorm Warning | DVN | Linn | 48 min |
| Jul 16, 3:39 PM CDT | Severe Thunderstorm Warning | DVN | Johnson | 51 min |
| Jul 16, 4:44 PM CDT | Flash Flood Warning | DVN | Johnson | 6 hr |
| Jul 16, 4:49 PM CDT | Severe Thunderstorm Warning | DVN | Washington | 56 min |
| Jul 16, 5:08 PM CDT | Severe Thunderstorm Warning | DVN | Johnson | 40 min |
| Jul 16, 5:36 PM CDT | Tornado Warning | DVN | Washington | 39 min |
| Jul 16, 5:40 PM CDT | Flash Flood Warning | DVN | Washington | 6 hr |
| Jul 16, 6:04 PM CDT | Severe Thunderstorm Warning | DVN | Henry | 56 min |
| Jul 16, 6:13 PM CDT | Severe Thunderstorm Warning | DVN | Jefferson, Keokuk | 62 min |
| Jul 16, 6:26 PM CDT | Tornado Warning | DVN | Jefferson | 49 min |
| Jul 16, 6:51 PM CDT | Severe Thunderstorm Warning | DVN | Benton, Linn | 54 min |
| Jul 16, 6:58 PM CDT | Flash Flood Watch | DVN | Benton, Buchanan, Cedar, Clinton, Delaware, Des Moines and 15 more | 59 hr |
Nearby
Tornado Warnings in Iowa, 2007Every tornado warning in 2007Tornadoes in 2007
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.