Alert archive / Indiana / Cass County

Weather alerts in Cass County, Indiana, 2009

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

Cass County and its neighbors

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

Alerts
105
Warnings
26
Watches
20
Advisories
27
Busiest month
March15 alerts
Busiest day
March 8, 200910 alerts

Over time

By month

Warning verification

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

0 of 1 tornado warnings covering Cass County in 2009 had a tornado report inside them.

Cass County, 2009

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings10100%0
Severe thunderstorm warnings6350%580%41 min
Flash flood warnings110%1100%112 min

Each office's whole area, 2009

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Northern Indiana: tornado warnings12375%7100%22 min
NWS Northern Indiana: severe thunderstorm warnings592558%9077%26 min
NWS Northern Indiana: flash flood warnings15380%786%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, Eastern Time. Each opens its own page with the text, the map, the radar and the sounding.

IssuedProductOfficeLasted
Jan 6, 4:58 AM ESTWinter Weather AdvisoryIWX28 hr
Jan 9, 4:47 AM ESTWinter Weather AdvisoryIWX38 hr
Jan 10, 12:53 AM ESTMesoscale DiscussionSPC6 hr
Jan 12, 4:01 PM ESTBlizzard WatchIWX23 hr
Jan 12, 4:01 PM ESTWinter Weather AdvisoryIWX23 hr
Jan 14, 12:38 AM ESTMesoscale DiscussionSPC4 hr
Jan 14, 5:22 AM ESTWind Chill WarningIWX55 hr
Jan 14, 5:22 AM ESTWinter Weather AdvisoryIWX14 hr
Jan 16, 12:05 PM ESTWind Chill AdvisoryIWX7 hr
Jan 16, 7:26 PM ESTWind Chill WarningIWX12 hr
Jan 27, 4:10 AM ESTWinter Weather AdvisoryIWX33 hr
Feb 10, 4:40 AM ESTFlood WatchIWX44 hr
Feb 10, 4:41 AM ESTHigh Wind WatchIWX11 hr
Feb 10, 3:35 PM ESTHigh Wind WarningIWX37 hr
Feb 11, 10:56 AM ESTAreal Flood WarningIWX6 hr
Feb 11, 11:10 AM ESTRiver Flood WarningIWX71 hr
Feb 11, 11:10 AM ESTRiver Flood WarningIWX35 hr
Feb 11, 3:16 PM ESTMesoscale DiscussionSPC89 min
Feb 11, 4:45 PM ESTAreal Flood WarningIWX9 hr
Feb 12, 4:06 AM ESTWind AdvisoryIWX14 hr
Feb 20, 3:48 PM ESTWinter Weather AdvisoryIWX24 hr
Feb 26, 4:04 AM ESTDense Fog AdvisoryIWX8 hr
Mar 6, 2:39 PM ESTFlood WatchIWX52 hr
Mar 7, 10:22 PM ESTRiver Flood WarningIWX7 days
Mar 8, 5:13 AM EDTWind AdvisoryIWX12 hr
Mar 8, 7:43 AM EDTAreal Flood AdvisoryIWX6 hr
Mar 8, 10:57 AM EDTAreal Flood WarningIWX6 hr
Mar 8, 11:48 AM EDTRiver Flood WarningIWX3 days
Mar 8, 2:52 PM EDTTornado WatchSPC5 hr
Mar 8, 3:14 PM EDTTornado WarningIWX46 min
Mar 8, 3:20 PM EDTMesoscale DiscussionSPC55 min
Mar 8, 4:06 PM EDTSevere Thunderstorm WarningIWX54 min
Mar 8, 5:25 PM EDTHigh Wind WarningIWX7 hr
Mar 9, 4:21 AM EDTFlash Flood WatchIWX45 hr
Mar 10, 4:23 AM EDTWind AdvisoryIWX30 hr
Mar 10, 9:04 PM EDTAreal Flood WarningIWX21 hr
Mar 11, 6:04 PM EDTAreal Flood WarningIWX12 hr
Apr 2, 11:27 AM EDTRiver Flood WatchIWX25 hr
Apr 2, 9:02 PM EDTMesoscale DiscussionSPC118 min
Apr 5, 11:18 AM EDTRiver Flood WatchIWX11 hr
Apr 5, 11:50 AM EDTMesoscale DiscussionSPC115 min
Apr 5, 10:13 PM EDTRiver Flood WarningIWX60 hr
Apr 5, 10:13 PM EDTRiver Flood WarningIWX24 hr
Apr 27, 4:26 AM EDTWind AdvisoryIWX11 hr
May 13, 11:17 PM EDTMesoscale DiscussionSPC58 min
May 13, 11:51 PM EDTSevere Thunderstorm WatchSPC4 hr
May 15, 4:17 PM EDTFlood WatchIWX12 hr
May 15, 6:31 PM EDTMesoscale DiscussionSPC119 min
May 15, 7:39 PM EDTTornado WatchSPC6 hr
May 15, 8:04 PM EDTSpecial Weather StatementIWX56 min
May 15, 9:14 PM EDTMesoscale DiscussionSPC2 hr
May 15, 9:53 PM EDTFlash Flood WarningIWX6 hr
May 15, 10:00 PM EDTSpecial Weather StatementIWX2 hr
May 15, 11:24 PM EDTSevere Thunderstorm WarningIWX56 min
May 16, 5:22 AM EDTRiver Flood WarningIWX17 hr
May 17, 3:51 AM EDTFrost AdvisoryIWX28 hr
May 29, 4:17 PM EDTMesoscale DiscussionSPC88 min
May 30, 7:01 PM EDTMesoscale DiscussionSPC59 min
May 30, 7:29 PM EDTSevere Thunderstorm WatchSPC4 hr
Jun 1, 3:37 PM EDTSevere Thunderstorm WatchSPC7 hr
Jun 1, 6:31 PM EDTFlash Flood WatchIWX7 hr
Jun 1, 7:34 PM EDTMesoscale DiscussionSPC86 min
Jun 1, 11:10 PM EDTAreal Flood AdvisoryIWX6 hr
Jun 1, 11:25 PM EDTSpecial Weather StatementIWX50 min
Jun 19, 3:38 AM EDTMesoscale DiscussionSPC97 min
Jun 19, 4:16 AM EDTSevere Thunderstorm WatchSPC6 hr
Jun 19, 11:27 AM EDTMesoscale DiscussionSPC63 min
Jun 19, 11:50 AM EDTTornado WatchSPC7 hr
Jun 19, 2:37 PM EDTMesoscale DiscussionSPC83 min
Jun 19, 6:11 PM EDTMesoscale DiscussionSPC94 min
Jun 19, 6:37 PM EDTMesoscale DiscussionSPC53 min
Jun 19, 6:59 PM EDTTornado WatchSPC8 hr
Jun 19, 8:41 PM EDTSpecial Weather StatementIWX64 min
Jun 19, 9:34 PM EDTMesoscale DiscussionSPC86 min
Jul 25, 12:46 AM EDTMesoscale DiscussionSPC89 min
Jul 28, 4:51 PM EDTSpecial Weather StatementIWX54 min
Jul 28, 9:54 PM EDTSpecial Weather StatementIWX51 min
Aug 9, 3:40 AM EDTHeat AdvisoryIWX16 hr
Aug 11, 12:39 PM EDTMesoscale DiscussionSPC2 hr
Aug 11, 4:47 PM EDTSpecial Weather StatementIWX58 min
Aug 11, 5:12 PM EDTAreal Flood AdvisoryIWX93 min
Aug 17, 5:01 PM EDTSpecial Weather StatementIWX44 min
Aug 17, 9:14 PM EDTSevere Thunderstorm WarningIWX33 min
Aug 19, 5:36 PM EDTMesoscale DiscussionSPC84 min
Aug 19, 6:11 PM EDTTornado WatchSPC5 hr
Aug 19, 6:59 PM EDTSevere Thunderstorm WarningIWX61 min
Aug 19, 7:53 PM EDTSevere Thunderstorm WarningIWX52 min
Aug 20, 7:45 AM EDTSpecial Weather StatementIWX60 min
Sep 9, 9:16 PM EDTDense Fog AdvisoryIWX12 hr
Sep 27, 11:04 AM EDTWind AdvisoryIWX35 hr
Sep 27, 10:46 PM EDTSevere Thunderstorm WatchSPC4 hr
Sep 27, 11:59 PM EDTSpecial Weather StatementIWX31 min
Sep 28, 12:26 AM EDTSpecial Weather StatementIWX64 min
Sep 28, 12:40 AM EDTSevere Thunderstorm WarningIWX37 min
Sep 30, 4:07 AM EDTFrost AdvisoryIWX29 hr
Oct 10, 4:19 AM EDTFreeze WarningIWX29 hr
Nov 23, 11:06 PM ESTDense Fog AdvisoryIWX10 hr
Dec 7, 3:34 PM ESTHigh Wind WatchIWX22 hr
Dec 8, 1:32 PM ESTWind AdvisoryIWX9 hr
Dec 8, 6:40 PM ESTWinter Weather AdvisoryIWX6 hr
Dec 8, 10:24 PM ESTHigh Wind WarningIWX20 hr
Dec 23, 4:20 AM ESTWinter Weather AdvisoryIWX33 hr
Dec 24, 1:08 PM ESTFreezing Rain AdvisoryIWX9 hr
Dec 26, 5:27 PM ESTWinter Weather AdvisoryIWX8 hr
Dec 27, 4:11 AM ESTWinter Weather AdvisoryIWX15 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.