Alert archive / Tennessee / Grundy County

Weather alerts in Grundy County, Tennessee, 2021

96 weather alerts in 2021, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Grundy County and its neighbors

Each county as a circle sized by its count in 2021. Tap one for its archive.

Alerts
96
Warnings
17
Watches
20
Advisories
31
Busiest month
March21 alerts
Busiest day
December 11, 20216 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 Grundy County in 2021 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 1 minutes after it went out.

Grundy County, 2021

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings3167%1100%1 min
Severe thunderstorm warnings6433%250%17 min
Flash flood warnings00

Each office's whole area, 2021

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Nashville, TN: tornado warnings632363%5463%16 min
NWS Nashville, TN: severe thunderstorm warnings1668449%30073%23 min
NWS Nashville, TN: flash flood warnings744934%15787%139 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 7, 10:07 AM CSTWinter Weather AdvisoryOHX23 hr
Jan 15, 2:46 AM CSTWinter Weather AdvisoryOHX31 hr
Jan 22, 12:39 AM CSTDense Fog AdvisoryOHX8 hr
Jan 30, 1:23 PM CSTWind AdvisoryOHX14 hr
Jan 31, 2:05 PM CSTWinter Weather AdvisoryOHX34 hr
Feb 6, 2:44 AM CSTWinter Weather AdvisoryOHX27 hr
Feb 12, 10:00 PM CSTWinter Weather AdvisoryOHX14 hr
Feb 13, 3:14 AM CSTWinter Storm WatchOHX24 hr
Feb 14, 3:43 AM CSTWinter Storm WarningOHX42 hr
Feb 14, 7:10 AM CSTWinter Weather AdvisoryOHX11 hr
Feb 16, 2:53 PM CSTWinter Storm WatchOHX13 hr
Feb 17, 3:24 AM CSTWinter Storm WarningOHX30 hr
Feb 17, 1:00 PM CSTMesoscale DiscussionSPC3 hr
Feb 17, 7:44 PM CSTMesoscale DiscussionSPC5 hr
Feb 18, 9:17 AM CSTWinter Weather AdvisoryOHX12 hr
Feb 27, 2:50 AM CSTFlood WatchOHX51 hr
Feb 28, 7:11 PM CSTSevere Thunderstorm WatchSPC3 hr
Feb 28, 7:16 PM CSTMesoscale DiscussionSPC59 min
Feb 28, 8:45 PM CSTMesoscale DiscussionSPC90 min
Mar 18, 8:23 AM CDTRiver Flood AdvisoryOHX6 hr
Mar 24, 1:28 PM CDTFlood WatchOHX7 hr
Mar 24, 8:08 PM CDTFlash Flood WatchOHX27 hr
Mar 25, 2:19 AM CDTWind AdvisoryOHX21 hr
Mar 25, 3:48 PM CDTTornado WatchSPC7 hr
Mar 25, 7:36 PM CDTMesoscale DiscussionSPC84 min
Mar 25, 10:37 PM CDTSpecial Weather StatementOHX23 min
Mar 26, 5:58 PM CDTFlash Flood WatchOHX42 hr
Mar 27, 7:41 AM CDTMesoscale DiscussionSPC2 hr
Mar 27, 11:55 AM CDTMesoscale DiscussionSPC3 hr
Mar 27, 1:51 PM CDTTornado WatchSPC7 hr
Mar 27, 11:27 PM CDTTornado WatchSPC8 hr
Mar 28, 1:25 AM CDTMesoscale DiscussionSPC2 hr
Mar 28, 2:57 AM CDTSpecial Weather StatementOHX63 min
Mar 29, 6:09 PM CDTFlash Flood WatchOHX39 hr
Mar 31, 1:22 PM CDTRiver Flood AdvisoryOHX7 hr
Mar 31, 1:39 PM CDTFreeze WarningOHX19 hr
Mar 31, 1:39 PM CDTHard Freeze WarningOHX43 hr
Apr 1, 1:13 PM CDTFreeze WarningOHX44 hr
Apr 3, 2:09 PM CDTFrost AdvisoryOHX18 hr
Apr 20, 2:17 AM CDTFreeze WatchOHX24 hr
Apr 21, 2:13 AM CDTFreeze WarningOHX30 hr
Apr 22, 2:20 AM CDTFrost AdvisoryOHX29 hr
Apr 24, 5:05 PM CDTSpecial Weather StatementOHX40 min
Apr 24, 5:22 PM CDTTornado WarningOHX23 min
Apr 24, 5:45 PM CDTSpecial Weather StatementOHX30 min
Apr 24, 6:02 PM CDTTornado WarningOHX28 min
May 3, 6:50 AM CDTMesoscale DiscussionSPC115 min
May 4, 5:13 AM CDTSevere Thunderstorm WatchSPC5 hr
May 4, 7:31 AM CDTMesoscale DiscussionSPC89 min
May 4, 7:53 AM CDTSevere Thunderstorm WarningOHX37 min
May 6, 6:27 PM CDTSevere Thunderstorm WarningOHX48 min
May 6, 7:15 PM CDTSpecial Weather StatementOHX30 min
May 9, 2:22 AM CDTWind AdvisoryOHX17 hr
May 9, 3:23 PM CDTMesoscale DiscussionSPC2 hr
May 9, 8:43 PM CDTSpecial Weather StatementOHX32 min
May 26, 8:58 PM CDTDense Fog AdvisoryOHX12 hr
Jun 3, 12:26 PM CDTMesoscale DiscussionSPC2 hr
Jun 4, 4:06 AM CDTDense Fog AdvisoryOHX4 hr
Jul 27, 3:08 AM CDTDense Fog AdvisoryOHX5 hr
Jul 28, 2:47 AM CDTDense Fog AdvisoryOHX5 hr
Jul 29, 3:23 AM CDTDense Fog AdvisoryOHX4 hr
Jul 31, 11:29 PM CDTSevere Thunderstorm WatchSPC3 hr
Jul 31, 11:55 PM CDTSevere Thunderstorm WarningOHX53 min
Aug 11, 6:40 PM CDTSpecial Weather StatementOHX35 min
Aug 15, 4:16 PM CDTAreal Flood AdvisoryOHX119 min
Aug 18, 8:06 PM CDTSpecial Weather StatementOHX54 min
Aug 18, 8:57 PM CDTSpecial Weather StatementOHX63 min
Aug 29, 4:12 AM CDTFlash Flood WatchOHX62 hr
Sep 18, 2:24 AM CDTFlash Flood WatchOHX65 hr
Sep 19, 10:04 AM CDTAreal Flood AdvisoryOHX3 hr
Oct 6, 3:06 AM CDTFlash Flood WatchOHX28 hr
Oct 6, 1:26 PM CDTMesoscale DiscussionSPC3 hr
Oct 6, 2:53 PM CDTTornado WatchSPC7 hr
Oct 6, 5:25 PM CDTMesoscale DiscussionSPC95 min
Oct 6, 7:31 PM CDTMesoscale DiscussionSPC89 min
Oct 6, 9:15 PM CDTAreal Flood AdvisoryOHX3 hr
Oct 8, 1:35 AM CDTDense Fog AdvisoryOHX7 hr
Oct 21, 2:50 PM CDTMesoscale DiscussionSPC2 hr
Nov 2, 2:53 AM CDTFrost AdvisoryOHX30 hr
Nov 2, 2:18 PM CDTFreeze WatchOHX12 hr
Nov 3, 2:35 AM CDTFreeze WarningOHX30 hr
Nov 3, 1:50 PM CDTFreeze WarningOHX43 hr
Nov 6, 2:30 AM CDTDense Fog AdvisoryOHX8 hr
Nov 12, 12:15 AM CSTDense Fog AdvisoryOHX8 hr
Dec 6, 7:59 AM CSTSevere Thunderstorm WarningOHX31 min
Dec 10, 11:22 AM CSTWind AdvisoryOHX25 hr
Dec 11, 2:00 AM CSTMesoscale DiscussionSPC90 min
Dec 11, 3:41 AM CSTTornado WatchSPC6 hr
Dec 11, 6:15 AM CSTMesoscale DiscussionSPC90 min
Dec 11, 6:58 AM CSTSevere Thunderstorm WarningOHX32 min
Dec 11, 7:22 AM CSTSevere Thunderstorm WarningOHX38 min
Dec 11, 7:35 AM CSTTornado WarningOHX25 min
Dec 26, 5:17 AM CSTDense Fog AdvisoryOHX6 hr
Dec 29, 7:02 PM CSTSpecial Weather StatementOHX28 min
Dec 30, 6:21 AM CSTDense Fog AdvisoryOHX3 hr
Dec 30, 7:50 PM CSTDense Fog AdvisoryOHX7 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 archive20202022

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.