Alert archive / Mississippi / Calhoun County

Weather alerts in Calhoun County, Mississippi, 2017

93 weather alerts in 2017, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Calhoun County and its neighbors

Each county as a circle sized by its count in 2017. Tap one for its archive.

Alerts
93
Warnings
11
Watches
15
Advisories
26
Busiest month
March21 alerts
Busiest day
April 30, 20175 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 3 tornado warnings covering Calhoun County in 2017 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 1 minutes after it went out.

Calhoun County, 2017

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings3167%1100%1 min
Severe thunderstorm warnings4250%475%37 min
Flash flood warnings10100%0

Each office's whole area, 2017

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Memphis, TN: tornado warnings711480%2568%17 min
NWS Memphis, TN: severe thunderstorm warnings27213251%38970%23 min
NWS Memphis, TN: flash flood warnings992971%7175%107 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
Dec 31, 9:34 PM CSTDense Fog AdvisoryMEG11 hr
Jan 1, 6:19 PM CSTDense Fog AdvisoryMEG16 hr
Jan 5, 5:45 PM CSTWinter Weather AdvisoryMEG25 hr
Jan 6, 2:14 PM CSTWind Chill AdvisoryMEG19 hr
Jan 9, 6:16 PM CSTWind AdvisoryMEG24 hr
Jan 13, 10:08 PM CSTDense Fog AdvisoryMEG13 hr
Jan 15, 1:04 AM CSTDense Fog AdvisoryMEG10 hr
Feb 7, 12:22 PM CSTMesoscale DiscussionSPC2 hr
Feb 7, 11:25 PM CSTDense Fog AdvisoryMEG10 hr
Feb 23, 3:32 AM CSTDense Fog AdvisoryMEG5 hr
Feb 24, 9:07 PM CSTSpecial Weather StatementMEG23 min
Feb 28, 2:10 AM CSTMesoscale DiscussionSPC3 hr
Mar 1, 10:08 AM CSTMesoscale DiscussionSPC2 hr
Mar 1, 10:57 AM CSTSpecial Weather StatementMEG18 min
Mar 1, 11:48 AM CSTTornado WatchSPC6 hr
Mar 7, 2:58 AM CSTMesoscale DiscussionSPC92 min
Mar 7, 3:37 AM CSTSevere Thunderstorm WatchSPC8 hr
Mar 7, 8:03 AM CSTMesoscale DiscussionSPC117 min
Mar 7, 11:02 AM CSTMesoscale DiscussionSPC58 min
Mar 10, 12:44 AM CSTSevere Thunderstorm WarningMEG46 min
Mar 10, 12:50 AM CSTMesoscale DiscussionSPC85 min
Mar 10, 1:19 AM CSTSpecial Weather StatementMEG56 min
Mar 11, 3:45 AM CSTFrost AdvisoryMEG30 hr
Mar 13, 2:40 PM CDTFreeze WatchMEG13 hr
Mar 14, 3:46 AM CDTFreeze WatchMEG23 hr
Mar 14, 3:46 AM CDTFreeze WarningMEG32 hr
Mar 15, 3:03 AM CDTFreeze WarningMEG31 hr
Mar 25, 1:34 PM CDTMesoscale DiscussionSPC116 min
Mar 27, 12:08 PM CDTSevere Thunderstorm WatchSPC8 hr
Mar 27, 12:12 PM CDTMesoscale DiscussionSPC2 hr
Mar 27, 3:33 PM CDTMesoscale DiscussionSPC87 min
Mar 27, 3:39 PM CDTMesoscale DiscussionSPC2 hr
Mar 30, 4:14 AM CDTSpecial Weather StatementMEG91 min
Apr 2, 5:06 PM CDTMesoscale DiscussionSPC84 min
Apr 2, 5:26 PM CDTSevere Thunderstorm WatchSPC3 hr
Apr 2, 6:29 PM CDTSevere Thunderstorm WarningMEG61 min
Apr 2, 8:39 PM CDTWind AdvisoryMEG7 hr
Apr 5, 3:33 AM CDTWind AdvisoryMEG31 hr
Apr 22, 12:51 PM CDTMesoscale DiscussionSPC114 min
Apr 22, 4:56 PM CDTMesoscale DiscussionSPC64 min
Apr 26, 5:02 PM CDTSevere Thunderstorm WatchSPC6 hr
Apr 26, 7:36 PM CDTMesoscale DiscussionSPC84 min
Apr 26, 8:50 PM CDTSpecial Weather StatementMEG40 min
Apr 26, 9:37 PM CDTSpecial Weather StatementMEG53 min
Apr 27, 4:08 AM CDTFlash Flood WatchMEG3 days
Apr 28, 1:55 PM CDTWind AdvisoryMEG29 hr
Apr 30, 2:17 AM CDTWind AdvisoryMEG17 hr
Apr 30, 6:59 AM CDTMesoscale DiscussionSPC2 hr
Apr 30, 9:58 AM CDTSevere Thunderstorm WarningMEG62 min
Apr 30, 10:25 AM CDTTornado WarningMEG39 min
Apr 30, 10:36 AM CDTTornado WatchSPC8 hr
May 20, 2:12 PM CDTMesoscale DiscussionSPC93 min
May 27, 11:46 PM CDTMesoscale DiscussionSPC59 min
May 28, 12:18 AM CDTSevere Thunderstorm WatchSPC6 hr
May 28, 2:11 AM CDTMesoscale DiscussionSPC2 hr
Jun 15, 11:36 AM CDTMesoscale DiscussionSPC114 min
Jun 15, 1:56 PM CDTSevere Thunderstorm WarningMEG49 min
Jun 16, 12:05 PM CDTMesoscale DiscussionSPC2 hr
Jun 16, 12:42 PM CDTSevere Thunderstorm WatchSPC10 hr
Jun 16, 3:40 PM CDTMesoscale DiscussionSPC2 hr
Jun 16, 3:41 PM CDTSpecial Weather StatementMEG49 min
Jun 16, 6:19 PM CDTMesoscale DiscussionSPC56 min
Jun 18, 1:48 PM CDTMesoscale DiscussionSPC117 min
Jun 18, 10:33 PM CDTFlash Flood WarningMEG3 hr
Jun 22, 2:47 AM CDTFlash Flood WatchMEG41 hr
Jun 22, 3:48 PM CDTMesoscale DiscussionSPC87 min
Jun 22, 6:59 PM CDTMesoscale DiscussionSPC61 min
Jun 22, 8:57 PM CDTMesoscale DiscussionSPC63 min
Jun 23, 2:04 PM CDTSevere Thunderstorm WatchSPC6 hr
Jul 4, 5:58 PM CDTMesoscale DiscussionSPC2 hr
Jul 19, 3:43 AM CDTHeat AdvisoryMEG5 days
Jul 26, 11:55 AM CDTHeat AdvisoryMEG30 hr
Aug 30, 3:45 PM CDTWind AdvisoryMEG47 hr
Aug 31, 11:13 AM CDTTornado WatchSPC11 hr
Aug 31, 11:40 AM CDTTornado WarningMEG35 min
Aug 31, 12:14 PM CDTTornado WarningMEG31 min
Aug 31, 5:47 PM CDTMesoscale DiscussionSPC88 min
Sep 3, 2:07 AM CDTDense Fog AdvisoryMEG7 hr
Sep 5, 2:36 PM CDTMesoscale DiscussionSPC54 min
Oct 27, 3:46 AM CDTFreeze WatchMEG23 hr
Oct 28, 2:41 AM CDTFreeze WarningMEG31 hr
Oct 29, 7:45 PM CDTFrost AdvisoryMEG12 hr
Nov 2, 3:52 PM CDTMesoscale DiscussionSPC113 min
Nov 3, 7:59 PM CDTMesoscale DiscussionSPC2 hr
Nov 17, 3:25 PM CSTWind AdvisoryMEG28 hr
Nov 18, 3:18 PM CSTMesoscale DiscussionSPC117 min
Dec 17, 10:40 PM CSTDense Fog AdvisoryMEG10 hr
Dec 18, 8:25 PM CSTDense Fog AdvisoryMEG15 hr
Dec 21, 2:41 AM CSTDense Fog AdvisoryMEG6 hr
Dec 21, 8:56 AM CSTDense Fog AdvisoryMEG2 hr
Dec 22, 7:32 AM CSTDense Fog AdvisoryMEG2 hr
Dec 22, 11:11 PM CSTMesoscale DiscussionSPC3 hr
Dec 30, 3:56 AM CSTWinter Weather AdvisoryMEG30 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 archive20162018

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.