Alert archive / North Carolina / Forsyth County

Weather alerts in Forsyth County, North Carolina, 2020

134 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Forsyth County and its neighbors

Each county as a circle sized by its count in 2020. Tap one for its archive.

Alerts
134
Warnings
35
Watches
11
Advisories
34
Busiest month
August33 alerts
Busiest day
August 6, 20208 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 2 tornado warnings covering Forsyth County in 2020 had a tornado report inside them.

Forsyth County, 2020

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings20100%0
Severe thunderstorm warnings10100%2875%26 min
Flash flood warnings12833%12100%48 min

Each office's whole area, 2020

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Raleigh, NC: tornado warnings32584%978%6 min
NWS Raleigh, NC: severe thunderstorm warnings16410437%38082%26 min
NWS Raleigh, NC: flash flood warnings614034%17585%130 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 11, 8:40 PM ESTMesoscale DiscussionSPC95 min
Jan 11, 9:35 PM ESTSevere Thunderstorm WatchSPC4 hr
Jan 11, 10:00 PM ESTSevere Thunderstorm WarningRAH45 min
Jan 11, 10:41 PM ESTSevere Thunderstorm WarningRAH64 min
Jan 24, 6:46 PM ESTSpecial Weather StatementRAH59 min
Jan 24, 7:21 PM ESTAreal Flood AdvisoryRAH114 min
Feb 5, 3:09 PM ESTFlood WatchRAH34 hr
Feb 6, 10:12 AM ESTTornado WatchSPC7 hr
Feb 6, 10:44 AM ESTSpecial Weather StatementRAH46 min
Feb 6, 10:57 AM ESTSevere Thunderstorm WarningRAH48 min
Feb 6, 11:12 AM ESTTornado WarningRAH33 min
Feb 6, 11:26 AM ESTSevere Thunderstorm WarningRAH64 min
Feb 6, 12:06 PM ESTAreal Flood AdvisoryRAH6 hr
Feb 6, 2:02 PM ESTAreal Flood WarningRAH6 hr
Feb 6, 7:54 PM ESTAreal Flood WarningRAH10 hr
Feb 6, 9:16 PM ESTWind AdvisoryRAH19 hr
Feb 11, 7:51 AM ESTSpecial Weather StatementRAH84 min
Feb 19, 2:16 PM ESTWinter Weather AdvisoryRAH44 hr
Feb 26, 3:31 AM ESTDense Fog AdvisoryRAH5 hr
Feb 29, 3:40 AM ESTSpecial Weather StatementRAH80 min
Mar 18, 4:25 AM EDTDense Fog AdvisoryRAH6 hr
Apr 7, 2:22 PM EDTSpecial Weather StatementRAH53 min
Apr 8, 6:06 PM EDTMesoscale DiscussionSPC84 min
Apr 10, 10:49 AM EDTRed Flag WarningRAH7 hr
Apr 10, 3:13 PM EDTFreeze WarningRAH17 hr
Apr 12, 3:33 PM EDTWind AdvisoryRAH24 hr
Apr 13, 2:39 AM EDTMesoscale DiscussionSPC96 min
Apr 13, 4:40 AM EDTSevere Thunderstorm WarningRAH50 min
Apr 13, 4:51 AM EDTAreal Flood AdvisoryRAH3 hr
Apr 13, 5:01 AM EDTTornado WatchSPC7 hr
Apr 13, 5:06 AM EDTTornado WarningRAH24 min
Apr 13, 5:28 AM EDTSevere Thunderstorm WarningRAH62 min
Apr 15, 3:06 AM EDTFrost AdvisoryRAH29 hr
Apr 16, 3:18 PM EDTFrost AdvisoryRAH17 hr
Apr 18, 9:51 PM EDTFrost AdvisoryRAH10 hr
Apr 30, 1:23 AM EDTSpecial Weather StatementRAH82 min
May 9, 3:57 AM EDTFreeze WarningRAH28 hr
May 19, 5:06 AM EDTSpecial Weather StatementRAH54 min
May 19, 3:39 PM EDTFlash Flood WatchRAH60 hr
May 21, 8:30 AM EDTFlash Flood Warning Considerable damage threatRAH5 hr
May 23, 7:15 PM EDTSpecial Weather StatementRAH60 min
May 24, 1:44 PM EDTMesoscale DiscussionSPC2 hr
May 24, 5:34 PM EDTSpecial Weather StatementRAH56 min
May 24, 6:29 PM EDTSpecial Weather StatementRAH61 min
May 27, 4:24 AM EDTFlash Flood WatchRAH21 hr
May 27, 8:01 PM EDTAreal Flood AdvisoryRAH3 hr
Jun 10, 4:24 PM EDTSpecial Weather StatementRAH66 min
Jun 20, 12:56 PM EDTSpecial Weather StatementRAH64 min
Jun 20, 2:08 PM EDTSpecial Weather StatementRAH67 min
Jun 25, 5:48 PM EDTMesoscale DiscussionSPC87 min
Jul 5, 7:40 PM EDTSevere Thunderstorm WarningRAH50 min
Jul 5, 8:12 PM EDTFlash Flood Warning Considerable damage threatRAH84 min
Jul 5, 8:30 PM EDTSevere Thunderstorm WarningRAH45 min
Jul 10, 6:34 PM EDTSpecial Weather StatementRAH56 min
Jul 10, 8:18 PM EDTSevere Thunderstorm WarningRAH42 min
Jul 12, 11:45 PM EDTSpecial Weather StatementRAH30 min
Jul 17, 1:47 PM EDTMesoscale DiscussionSPC118 min
Jul 17, 3:11 PM EDTSpecial Weather StatementRAH64 min
Jul 18, 3:18 PM EDTHeat AdvisoryRAH30 hr
Jul 18, 5:13 PM EDTAreal Flood AdvisoryRAH104 min
Jul 19, 2:59 PM EDTHeat AdvisoryRAH30 hr
Jul 20, 12:57 PM EDTMesoscale DiscussionSPC2 hr
Jul 20, 3:23 PM EDTHeat AdvisoryRAH30 hr
Jul 21, 1:00 PM EDTMesoscale DiscussionSPC2 hr
Jul 21, 3:00 PM EDTHeat AdvisoryRAH30 hr
Jul 21, 8:31 PM EDTSpecial Weather StatementRAH44 min
Jul 23, 1:11 PM EDTMesoscale DiscussionSPC2 hr
Jul 23, 4:09 PM EDTSpecial Weather StatementRAH66 min
Jul 23, 4:24 PM EDTFlash Flood Warning Considerable damage threatRAH5 hr
Jul 24, 9:02 AM EDTAreal Flood AdvisoryRAH3 hr
Jul 28, 3:19 PM EDTMesoscale DiscussionSPC116 min
Jul 29, 8:02 PM EDTSpecial Weather StatementRAH58 min
Jul 31, 7:43 PM EDTMesoscale DiscussionSPC3 hr
Jul 31, 9:56 PM EDTSpecial Weather StatementRAH64 min
Aug 2, 4:06 AM EDTFlash Flood WatchRAH52 hr
Aug 2, 2:18 PM EDTMesoscale DiscussionSPC57 min
Aug 3, 12:09 AM EDTSpecial Weather StatementRAH66 min
Aug 3, 1:13 AM EDTAreal Flood AdvisoryRAH3 hr
Aug 3, 1:22 AM EDTSpecial Weather StatementRAH53 min
Aug 3, 3:04 AM EDTSpecial Weather StatementRAH56 min
Aug 5, 1:37 PM EDTMesoscale DiscussionSPC113 min
Aug 5, 1:46 PM EDTSpecial Weather StatementRAH59 min
Aug 5, 8:54 PM EDTSpecial Weather StatementRAH36 min
Aug 5, 10:59 PM EDTSpecial Weather StatementRAH91 min
Aug 5, 11:32 PM EDTAreal Flood AdvisoryRAH100 min
Aug 6, 12:02 AM EDTFlash Flood Warning Considerable damage threatRAH86 min
Aug 6, 2:08 PM EDTMesoscale DiscussionSPC3 hr
Aug 6, 6:03 PM EDTSpecial Weather StatementRAH57 min
Aug 6, 6:26 PM EDTFlash Flood Warning Considerable damage threatRAH3 hr
Aug 6, 6:32 PM EDTSevere Thunderstorm WarningRAH43 min
Aug 6, 9:29 PM EDTFlash Flood Warning Considerable damage threatRAH2 hr
Aug 10, 5:04 PM EDTAreal Flood AdvisoryRAH2 hr
Aug 10, 5:19 PM EDTFlash Flood Warning Considerable damage threatRAH110 min
Aug 10, 5:34 PM EDTFlash Flood Warning Considerable damage threatRAH116 min
Aug 12, 1:15 PM EDTMesoscale DiscussionSPC2 hr
Aug 13, 8:09 PM EDTAreal Flood AdvisoryRAH3 hr
Aug 13, 8:31 PM EDTFlash Flood Warning Considerable damage threatRAH3 hr
Aug 14, 6:16 PM EDTAreal Flood AdvisoryRAH119 min
Aug 14, 6:36 PM EDTFlash Flood Warning Considerable damage threatRAH114 min
Aug 15, 3:56 AM EDTFlash Flood WatchRAH18 hr
Aug 15, 1:40 PM EDTSpecial Weather StatementRAH65 min
Aug 15, 2:16 PM EDTAreal Flood AdvisoryRAH3 hr
Aug 17, 3:16 PM EDTSpecial Weather StatementRAH59 min
Aug 22, 3:47 AM EDTDense Fog AdvisoryRAH5 hr
Aug 28, 7:21 PM EDTSpecial Weather StatementRAH54 min
Aug 28, 7:50 PM EDTMesoscale DiscussionSPC2 hr
Sep 16, 4:19 AM EDTFlash Flood WatchRAH47 hr
Sep 27, 3:21 AM EDTDense Fog AdvisoryRAH6 hr
Sep 29, 2:36 PM EDTMesoscale DiscussionSPC2 hr
Sep 29, 3:20 PM EDTSpecial Weather StatementRAH55 min
Oct 17, 1:59 PM EDTFrost AdvisoryRAH19 hr
Oct 25, 7:50 AM EDTSpecial Weather StatementRAH85 min
Oct 25, 8:26 AM EDTAreal Flood AdvisoryRAH3 hr
Oct 26, 9:13 PM EDTDense Fog AdvisoryRAH13 hr
Oct 28, 2:26 PM EDTWind AdvisoryRAH26 hr
Oct 28, 7:02 PM EDTTropical Storm WarningRAH22 hr
Oct 29, 8:56 PM EDTSpecial Weather StatementRAH49 min
Oct 29, 9:46 PM EDTAreal Flood WarningRAH8 hr
Nov 1, 3:28 AM ESTFreeze WatchRAH12 hr
Nov 1, 3:35 PM ESTFreeze WarningRAH16 hr
Nov 2, 1:59 PM ESTFreeze WarningRAH18 hr
Nov 11, 3:08 AM ESTFlash Flood WatchRAH36 hr
Nov 11, 5:16 PM ESTSpecial Weather StatementRAH44 min
Nov 11, 5:48 PM ESTAreal Flood AdvisoryRAH2 hr
Nov 12, 6:23 AM ESTFlash Flood Warning Considerable damage threatRAH4 hr
Nov 12, 9:56 AM ESTFlash Flood Warning Considerable damage threatRAH6 hr
Nov 12, 3:56 PM ESTAreal Flood WarningRAH5 hr
Nov 12, 8:52 PM ESTAreal Flood WarningRAH19 hr
Nov 26, 8:46 PM ESTDense Fog AdvisoryRAH12 hr
Nov 30, 7:38 AM ESTSpecial Weather StatementRAH52 min
Dec 4, 9:53 PM ESTSpecial Weather StatementRAH52 min
Dec 15, 3:54 AM ESTWinter Weather AdvisoryRAH36 hr
Dec 16, 6:36 AM ESTMesoscale DiscussionSPC4 hr
Dec 17, 2:57 AM ESTDense Fog AdvisoryRAH7 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 archive20192021

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.