Alert archive / Illinois / Vermilion County

Weather alerts in Vermilion County, Illinois, 2009

115 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Vermilion County and its neighbors

Each county as a circle sized by its count in 2009. Tap one for its archive.

Alerts
115
Warnings
36
Watches
23
Advisories
33
Busiest month
May27 alerts
Busiest day
May 16, 20098 alerts

Over time

By month

Warning verification

How often warnings here had a storm report inside them, and how much warning the reports had.

2 of 4 tornado warnings covering Vermilion County in 2009 had a tornado report inside them; 3 of 5 tornado reports fell inside a warning, on average 14 minutes after it went out.

Vermilion County, 2009

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings4250%560%14 min
Severe thunderstorm warnings181044%2972%18 min
Flash flood warnings4175%683%105 min

Each office's whole area, 2009

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Lincoln, IL: tornado warnings441077%2665%15 min
NWS Lincoln, IL: severe thunderstorm warnings1769844%35174%24 min
NWS Lincoln, IL: flash flood warnings371365%5155%100 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.

IssuedProductOfficeLasted
Jan 3, 8:40 PM CSTDense Fog AdvisoryILX9 hr
Jan 5, 3:12 PM CSTWinter Weather AdvisoryILX20 hr
Jan 6, 11:59 AM CSTWinter Weather AdvisoryILX4 hr
Jan 10, 2:27 AM CSTWinter Weather AdvisoryILX8 hr
Jan 12, 3:06 PM CSTWinter Weather AdvisoryILX11 hr
Jan 13, 2:53 PM CSTWind Chill AdvisoryILX68 hr
Jan 13, 2:53 PM CSTWinter Weather AdvisoryILX27 hr
Jan 13, 11:38 PM CSTMesoscale DiscussionSPC4 hr
Jan 14, 2:49 AM CSTWind Chill WarningILX56 hr
Jan 26, 3:35 AM CSTWinter Weather AdvisoryILX54 hr
Feb 10, 10:33 AM CSTFlood WatchILX29 hr
Feb 10, 12:36 PM CSTWind AdvisoryILX32 hr
Feb 11, 6:15 AM CSTAreal Flood AdvisoryILX14 hr
Feb 11, 9:52 AM CSTRiver Flood WarningILX11 hr
Feb 11, 2:02 PM CSTSevere Thunderstorm WarningILX26 min
Feb 26, 3:28 AM CSTDense Fog AdvisoryILX7 hr
Mar 5, 10:32 AM CSTWind AdvisoryILX7 hr
Mar 8, 9:31 AM CDTWind AdvisoryILX11 hr
Mar 8, 10:39 AM CDTTornado WatchSPC7 hr
Mar 8, 1:34 PM CDTSevere Thunderstorm WarningILX26 min
Mar 10, 3:52 PM CDTWind AdvisoryILX14 hr
Mar 23, 3:30 PM CDTWind AdvisoryILX24 hr
Mar 24, 3:19 PM CDTHigh Wind WarningILX5 hr
Apr 5, 10:50 AM CDTMesoscale DiscussionSPC115 min
Apr 26, 1:29 PM CDTWind AdvisoryILX6 hr
Apr 27, 1:57 AM CDTWind AdvisoryILX12 hr
May 7, 6:14 PM CDTSevere Thunderstorm WatchSPC8 hr
May 13, 9:27 AM CDTMesoscale DiscussionSPC63 min
May 13, 2:44 PM CDTFlood WatchILX14 hr
May 13, 6:02 PM CDTTornado WatchSPC5 hr
May 13, 8:35 PM CDTMesoscale DiscussionSPC85 min
May 13, 10:17 PM CDTMesoscale DiscussionSPC58 min
May 13, 10:51 PM CDTSevere Thunderstorm WatchSPC4 hr
May 14, 12:07 AM CDTSevere Thunderstorm WarningILX38 min
May 14, 12:56 AM CDTFlash Flood WarningILX6 hr
May 14, 7:36 AM CDTAreal Flood WarningILX5 hr
May 14, 3:02 PM CDTFlash Flood WatchILX32 hr
May 15, 2:05 PM CDTMesoscale DiscussionSPC25 min
May 15, 2:39 PM CDTTornado WatchSPC7 hr
May 15, 5:31 PM CDTMesoscale DiscussionSPC119 min
May 15, 6:06 PM CDTSevere Thunderstorm WarningILX54 min
May 15, 6:38 PM CDTTornado WarningILX31 min
May 15, 7:04 PM CDTFlash Flood WarningILX6 hr
May 15, 7:19 PM CDTSevere Thunderstorm WarningILX41 min
May 15, 7:50 PM CDTSevere Thunderstorm WarningILX40 min
May 15, 8:14 PM CDTMesoscale DiscussionSPC2 hr
May 15, 8:55 PM CDTSevere Thunderstorm WarningILX20 min
May 16, 12:59 AM CDTAreal Flood WarningILX172 days
May 16, 2:17 AM CDTRiver Flood WarningILX50 hr
May 16, 1:03 PM CDTAreal Flood WarningILX224 days
May 17, 5:57 AM CDTAreal Flood WarningILX226 days
May 29, 3:17 PM CDTMesoscale DiscussionSPC88 min
May 30, 6:01 PM CDTMesoscale DiscussionSPC59 min
Jun 1, 2:37 PM CDTSevere Thunderstorm WatchSPC7 hr
Jun 1, 4:01 PM CDTSpecial Weather StatementILX44 min
Jun 1, 4:08 PM CDTSevere Thunderstorm WarningILX67 min
Jun 1, 6:42 PM CDTSevere Thunderstorm WarningILX35 min
Jun 1, 8:09 PM CDTFlash Flood WarningILX6 hr
Jun 1, 8:57 PM CDTMesoscale DiscussionSPC63 min
Jun 2, 12:27 PM CDTSevere Thunderstorm WatchSPC8 hr
Jun 8, 4:33 PM CDTSevere Thunderstorm WatchSPC5 hr
Jun 10, 7:46 PM CDTTornado WatchSPC6 hr
Jun 11, 1:41 AM CDTAreal Flood AdvisoryILX6 hr
Jun 18, 4:12 AM CDTSevere Thunderstorm WatchSPC5 hr
Jun 18, 6:51 AM CDTSevere Thunderstorm WarningILX39 min
Jun 19, 2:24 PM CDTSevere Thunderstorm WatchSPC8 hr
Jun 19, 5:01 PM CDTSevere Thunderstorm WarningILX59 min
Jun 19, 5:37 PM CDTMesoscale DiscussionSPC53 min
Jun 19, 5:39 PM CDTTornado WarningILX51 min
Jun 19, 7:02 PM CDTSevere Thunderstorm WarningILX43 min
Jun 19, 7:59 PM CDTMesoscale DiscussionSPC91 min
Jun 19, 9:45 PM CDTMesoscale DiscussionSPC30 min
Jun 21, 2:23 PM CDTMesoscale DiscussionSPC97 min
Jun 22, 1:54 AM CDTHeat AdvisoryILX65 hr
Jun 25, 10:38 AM CDTHeat AdvisoryILX8 hr
Jul 24, 11:00 PM CDTSevere Thunderstorm WatchSPC3 hr
Jul 24, 11:46 PM CDTSevere Thunderstorm WarningILX59 min
Jul 24, 11:46 PM CDTMesoscale DiscussionSPC89 min
Jul 24, 11:57 PM CDTSevere Thunderstorm WarningILX48 min
Jul 25, 12:56 AM CDTSevere Thunderstorm WarningILX64 min
Aug 4, 12:05 AM CDTSevere Thunderstorm WarningILX32 min
Aug 4, 7:39 AM CDTSevere Thunderstorm WatchSPC4 hr
Aug 4, 7:41 AM CDTSpecial Weather StatementILX34 min
Aug 4, 9:52 AM CDTSevere Thunderstorm WarningILX53 min
Aug 8, 3:10 AM CDTHeat AdvisoryILX40 hr
Aug 17, 6:41 PM CDTAreal Flood AdvisoryILX4 hr
Aug 19, 12:49 PM CDTTornado WatchSPC6 hr
Aug 19, 3:05 PM CDTTornado WatchSPC2 hr
Aug 19, 3:19 PM CDTMesoscale DiscussionSPC86 min
Aug 19, 4:56 PM CDTSevere Thunderstorm WarningILX64 min
Aug 19, 5:17 PM CDTTornado WarningILX28 min
Aug 19, 5:23 PM CDTTornado WarningILX32 min
Aug 19, 8:56 PM CDTFlash Flood WatchILX10 hr
Aug 20, 5:16 AM CDTAreal Flood AdvisoryILX3 hr
Aug 27, 10:31 PM CDTMesoscale DiscussionSPC89 min
Aug 28, 12:01 AM CDTFlash Flood WarningILX2 hr
Aug 28, 12:25 AM CDTSpecial Weather StatementILX65 min
Sep 9, 4:45 AM CDTDense Fog AdvisoryILX6 hr
Sep 10, 2:39 AM CDTDense Fog AdvisoryILX7 hr
Sep 10, 8:43 PM CDTDense Fog AdvisoryILX11 hr
Sep 13, 4:55 AM CDTDense Fog AdvisoryILX4 hr
Sep 25, 8:51 PM CDTDense Fog AdvisoryILX13 hr
Sep 26, 1:42 PM CDTMesoscale DiscussionSPC93 min
Sep 27, 8:22 PM CDTTornado WatchSPC3 hr
Sep 27, 11:04 PM CDTMesoscale DiscussionSPC86 min
Oct 7, 3:43 AM CDTFlash Flood WatchILX57 hr
Oct 10, 2:11 AM CDTFreeze WarningILX25 hr
Oct 17, 3:23 AM CDTFrost AdvisoryILX30 hr
Oct 28, 3:21 PM CDTFlash Flood WatchILX4 days
Nov 20, 5:39 AM CSTDense Fog AdvisoryILX3 hr
Dec 8, 2:18 PM CSTWind AdvisoryILX28 hr
Dec 22, 2:57 PM CSTWinter Weather AdvisoryILX19 hr
Dec 22, 3:10 PM CSTFlood WatchILX67 hr
Dec 27, 3:14 AM CSTWinter Weather AdvisoryILX12 hr
Dec 29, 9:59 AM CSTRiver Flood WarningILX45 min

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.