Alert archive / Indiana / Porter County
Weather alerts in Porter County, Indiana, 2009
137 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Porter County and its neighbors
Each county as a circle sized by its count in 2009. Tap one for its archive.
- Alerts
- 137
- Warnings
- 39
- Watches
- 26
- Advisories
- 39
- Busiest month
- June28 alerts
- Busiest day
- June 19, 200912 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
1 of 2 tornado warnings covering Porter County in 2009 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 2 minutes after it went out.
Porter County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 2 | 1 | 50% | 1 | 100% | 2 min |
| Severe thunderstorm warnings | 7 | 5 | 29% | 5 | 80% | 33 min |
| Flash flood warnings | 6 | 1 | 83% | 1 | 100% | 266 min |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Chicago, IL: tornado warnings | 12 | 3 | 75% | 11 | 73% | 11 min |
| NWS Chicago, IL: severe thunderstorm warnings | 97 | 47 | 52% | 183 | 68% | 26 min |
| NWS Chicago, IL: flash flood warnings | 25 | 10 | 60% | 31 | 87% | 80 min |
An office's figures cover every county it serves, including across state lines.
Verified by the Iowa Environmental Mesonet's Cow, which matches each storm-based warning with the local storm reports inside its polygon while it was in force, within 15 km of its edge: a tornado warning counts as verified on a tornado report, a severe thunderstorm warning on hail of 1 inch or more, a gust of 58 mph or more, or wind damage, a flash flood warning on a flash flood report. The false alarm ratio is the share of warnings with no such report; "inside a warning" is the probability of detection, the share of reports that fell inside one; lead time runs from the warning's issue to each report inside it, counting zero for a report that came first. A warning with no report is not proof nothing happened: reports come from spotters, the public and damage surveys, and are thin where few people live.
The alerts
Every alert, in the order issued. Times are local, Central Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jan 8, 2:53 PM CST | Winter Weather Advisory | LOT | 51 hr |
| Jan 9, 10:05 AM CST | Areal Flood Advisory | LOT | 294 days |
| Jan 11, 11:07 AM CST | Areal Flood Advisory | LOT | 292 days |
| Jan 12, 4:21 AM CST | Blizzard Watch | LOT | 7 hr |
| Jan 12, 4:21 AM CST | Winter Weather Advisory | LOT | 28 hr |
| Jan 12, 11:49 AM CST | Blizzard Warning | LOT | 16 hr |
| Jan 12, 3:40 PM CST | Blizzard Watch | LOT | 19 hr |
| Jan 13, 2:07 PM CST | Wind Chill Watch | LOT | 13 hr |
| Jan 13, 3:02 PM CST | Winter Weather Advisory | LOT | 33 hr |
| Jan 13, 11:38 PM CST | Mesoscale Discussion | SPC | 4 hr |
| Jan 14, 3:23 AM CST | Wind Chill Warning | LOT | 57 hr |
| Jan 14, 6:52 AM CST | Winter Storm Warning | LOT | 17 hr |
| Jan 14, 4:00 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Jan 16, 3:08 PM CST | Wind Chill Advisory | LOT | 9 hr |
| Jan 18, 1:59 PM CST | Lake Effect Snow Watch | LOT | 6 hr |
| Jan 18, 7:21 PM CST | Lake Effect Snow Advisory | LOT | 14 hr |
| Jan 18, 8:36 PM CST | River Flood Advisory | LOT | 63 hr |
| Jan 19, 9:02 AM CST | Lake Effect Snow Warning | LOT | 31 hr |
| Jan 19, 9:21 AM CST | Areal Flood Advisory | LOT | 143 days |
| Jan 22, 5:13 AM CST | River Flood Advisory | LOT | 5 hr |
| Feb 2, 2:00 AM CST | Lake Effect Snow Watch | LOT | 26 hr |
| Feb 3, 3:40 AM CST | Lake Effect Snow Warning | LOT | 35 hr |
| Feb 3, 1:40 PM CST | Mesoscale Discussion | SPC | 5 hr |
| Feb 10, 4:00 AM CST | Flood Watch | LOT | 41 hr |
| Feb 11, 1:31 AM CST | Dense Fog Advisory | LOT | 7 hr |
| Feb 11, 3:40 AM CST | Wind Advisory | LOT | 18 hr |
| Feb 11, 9:23 AM CST | River Flood Warning | LOT | 8 days |
| Feb 11, 9:23 AM CST | River Flood Warning | LOT | 9 days |
| Feb 18, 10:44 PM CST | Winter Weather Advisory | LOT | 5 hr |
| Feb 19, 1:38 PM CST | Winter Storm Watch | LOT | 14 hr |
| Feb 20, 3:41 AM CST | Winter Storm Warning | LOT | 34 hr |
| Feb 20, 3:41 AM CST | Winter Weather Advisory | LOT | 41 hr |
| Feb 26, 3:50 AM CST | Dense Fog Advisory | LOT | 11 hr |
| Feb 26, 9:25 AM CST | River Flood Watch | LOT | 28 hr |
| Feb 26, 9:25 AM CST | River Flood Watch | LOT | 28 hr |
| Feb 27, 1:31 PM CST | River Flood Warning | LOT | 5 days |
| Feb 27, 1:31 PM CST | River Flood Warning | LOT | 4 days |
| Mar 6, 3:28 PM CST | Flash Flood Watch | LOT | 48 hr |
| Mar 8, 4:03 AM CDT | Areal Flood Warning | LOT | 30 hr |
| Mar 8, 9:13 AM CDT | Wind Advisory | LOT | 12 hr |
| Mar 8, 10:14 AM CDT | River Flood Warning | LOT | 18 days |
| Mar 8, 10:14 AM CDT | River Flood Warning | LOT | 19 days |
| Mar 8, 1:55 PM CDT | Tornado Warning | LOT | 65 min |
| Mar 8, 2:20 PM CDT | Mesoscale Discussion | SPC | 55 min |
| Mar 8, 4:36 PM CDT | High Wind Warning | LOT | 2 hr |
| Mar 9, 3:39 AM CDT | Flash Flood Watch | LOT | 24 hr |
| Mar 10, 2:03 AM CDT | Areal Flood Warning | LOT | 36 hr |
| Mar 10, 3:37 AM CDT | Wind Advisory | LOT | 27 hr |
| Mar 14, 11:04 PM CDT | Flash Flood Warning | LOT | 12 hr |
| Mar 24, 4:08 AM CDT | Wind Advisory | LOT | 16 hr |
| Mar 27, 5:29 PM CDT | Lakeshore Flood Advisory | LOT | 42 hr |
| Apr 2, 11:15 AM CDT | River Flood Watch | LOT | 23 hr |
| Apr 2, 11:15 AM CDT | River Flood Watch | LOT | 23 hr |
| Apr 5, 10:50 AM CDT | Mesoscale Discussion | SPC | 115 min |
| Apr 5, 3:45 PM CDT | Lakeshore Flood Advisory | LOT | 32 hr |
| Apr 5, 8:18 PM CDT | Areal Flood Advisory | LOT | 74 days |
| Apr 6, 1:04 AM CDT | Mesoscale Discussion | SPC | 4 hr |
| Apr 6, 4:59 AM CDT | River Flood Warning | LOT | 8 days |
| Apr 6, 4:59 AM CDT | River Flood Warning | LOT | 9 days |
| Apr 25, 1:55 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Apr 27, 3:55 AM CDT | Wind Advisory | LOT | 10 hr |
| Apr 28, 12:44 AM CDT | Areal Flood Advisory | LOT | 55 days |
| May 13, 10:17 PM CDT | Mesoscale Discussion | SPC | 58 min |
| May 13, 10:51 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| May 13, 11:13 PM CDT | Severe Thunderstorm Warning | LOT | 62 min |
| May 14, 12:02 AM CDT | Flash Flood Warning | LOT | 4 hr |
| May 14, 12:15 AM CDT | Severe Thunderstorm Warning | LOT | 43 min |
| May 14, 4:10 AM CDT | Areal Flood Warning | LOT | 3 hr |
| May 14, 3:34 PM CDT | Flash Flood Watch | LOT | 30 hr |
| May 15, 11:05 AM CDT | River Flood Warning | LOT | 58 hr |
| May 15, 11:05 AM CDT | River Flood Warning | LOT | 58 hr |
| May 15, 2:48 PM CDT | Areal Flood Advisory | LOT | 57 days |
| May 15, 11:16 PM CDT | Areal Flood Warning | LOT | 12 hr |
| May 22, 4:24 AM CDT | Lakeshore Flood Statement | LOT | 18 hr |
| May 25, 4:15 AM CDT | Lakeshore Flood Statement | LOT | 16 hr |
| Jun 1, 1:31 PM CDT | Mesoscale Discussion | SPC | 59 min |
| Jun 1, 2:37 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 1, 6:34 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Jun 3, 4:12 AM CDT | Lakeshore Flood Statement | LOT | 21 hr |
| Jun 8, 11:54 AM CDT | Mesoscale Discussion | SPC | 96 min |
| Jun 8, 3:53 PM CDT | Mesoscale Discussion | SPC | 67 min |
| Jun 11, 1:42 AM CDT | Flash Flood Warning | LOT | 3 hr |
| Jun 11, 2:45 AM CDT | Flash Flood Warning | LOT | 86 min |
| Jun 11, 4:15 AM CDT | Flash Flood Warning | LOT | 10 hr |
| Jun 11, 4:34 AM CDT | Lakeshore Flood Statement | LOT | 16 hr |
| Jun 11, 8:11 AM CDT | Flash Flood Warning | LOT | 6 hr |
| Jun 18, 11:07 PM CDT | Mesoscale Discussion | SPC | 53 min |
| Jun 18, 11:30 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 19, 2:38 AM CDT | Mesoscale Discussion | SPC | 97 min |
| Jun 19, 2:51 AM CDT | Severe Thunderstorm Warning | LOT | 69 min |
| Jun 19, 10:27 AM CDT | Mesoscale Discussion | SPC | 63 min |
| Jun 19, 10:50 AM CDT | Tornado Watch | SPC | 7 hr |
| Jun 19, 1:08 PM CDT | Flash Flood Watch | LOT | 8 hr |
| Jun 19, 1:37 PM CDT | Mesoscale Discussion | SPC | 83 min |
| Jun 19, 2:24 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 19, 5:11 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Jun 19, 5:37 PM CDT | Mesoscale Discussion | SPC | 53 min |
| Jun 19, 6:56 PM CDT | Severe Thunderstorm Warning | LOT | 94 min |
| Jun 22, 3:15 PM CDT | Heat Advisory | LOT | 52 hr |
| Jun 25, 3:57 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 27, 5:13 PM CDT | Lakeshore Flood Statement | LOT | 28 hr |
| Jun 28, 9:39 PM CDT | Lakeshore Flood Statement | LOT | 23 hr |
| Jun 29, 9:35 PM CDT | Lakeshore Flood Statement | LOT | 47 hr |
| Jul 5, 3:58 AM CDT | Dense Fog Advisory | LOT | 5 hr |
| Jul 16, 7:44 PM CDT | Severe Thunderstorm Warning | LOT | 47 min |
| Jul 17, 9:09 AM CDT | Lakeshore Flood Statement | LOT | 17 hr |
| Jul 28, 6:43 PM CDT | Special Weather Statement | LOT | 47 min |
| Jul 28, 7:22 PM CDT | Special Weather Statement | LOT | 38 min |
| Jul 28, 7:31 PM CDT | Areal Flood Advisory | LOT | 6 hr |
| Aug 4, 4:29 AM CDT | Dense Fog Advisory | LOT | 4 hr |
| Aug 8, 4:07 AM CDT | Heat Advisory | LOT | 38 hr |
| Aug 19, 12:49 PM CDT | Tornado Watch | SPC | 6 hr |
| Aug 19, 5:14 PM CDT | Severe Thunderstorm Warning | LOT | 61 min |
| Aug 19, 5:40 PM CDT | Areal Flood Advisory | LOT | 5 hr |
| Aug 19, 7:30 PM CDT | Tornado Warning | LOT | 19 min |
| Aug 21, 4:07 PM CDT | Lakeshore Flood Statement | LOT | 32 hr |
| Aug 23, 10:33 AM CDT | Lakeshore Flood Statement | LOT | 12 hr |
| Aug 26, 4:03 AM CDT | Lakeshore Flood Statement | LOT | 23 hr |
| Aug 29, 3:40 AM CDT | Lakeshore Flood Statement | LOT | 45 hr |
| Sep 9, 9:19 PM CDT | Dense Fog Advisory | LOT | 12 hr |
| Sep 12, 9:43 PM CDT | Dense Fog Advisory | LOT | 11 hr |
| Sep 27, 5:55 AM CDT | Dense Fog Advisory | LOT | 4 hr |
| Sep 27, 2:03 PM CDT | Lakeshore Flood Warning | LOT | 39 hr |
| Sep 27, 8:22 PM CDT | Tornado Watch | SPC | 3 hr |
| Sep 27, 10:03 PM CDT | Severe Thunderstorm Warning | LOT | 57 min |
| Sep 28, 4:29 AM CDT | Wind Advisory | LOT | 15 hr |
| Oct 6, 9:09 PM CDT | Wind Advisory | LOT | 5 hr |
| Oct 9, 4:00 PM CDT | Freeze Warning | LOT | 41 hr |
| Oct 29, 3:13 PM CDT | Flood Watch | LOT | 24 hr |
| Nov 23, 9:40 PM CST | Dense Fog Advisory | LOT | 11 hr |
| Dec 9, 4:47 AM CST | Wind Advisory | LOT | 13 hr |
| Dec 22, 11:31 AM CST | Winter Storm Watch | LOT | 17 hr |
| Dec 22, 3:35 PM CST | Winter Weather Advisory | LOT | 29 hr |
| Dec 23, 3:45 AM CST | Flood Watch | LOT | 55 hr |
| Dec 23, 5:15 PM CST | Mesoscale Discussion | SPC | 4 hr |
| Dec 23, 8:46 PM CST | Ice Storm Warning | LOT | 18 hr |
| Dec 27, 4:29 AM CST | Winter Weather Advisory | LOT | 10 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20082010
Sources
National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Warning verification from the Mesonet's Cow. Rebuilt daily.