Alert archive / North Carolina / Forsyth County

Weather alerts in Forsyth County, North Carolina, 2008

123 weather alerts in 2008, 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 2008. Tap one for its archive.

Alerts
123
Warnings
35
Watches
28
Advisories
33
Busiest month
August22 alerts
Busiest day
May 9, 200810 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 2 tornado warnings covering Forsyth County in 2008 had a tornado report inside them; 3 of 3 tornado reports fell inside a warning, on average 9 minutes after it went out.

Forsyth County, 2008

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings220%3100%9 min
Severe thunderstorm warnings181328%1771%28 min
Flash flood warnings5260%2100%36 min

Each office's whole area, 2008

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Raleigh, NC: tornado warnings621576%4185%17 min
NWS Raleigh, NC: severe thunderstorm warnings46925645%48387%23 min
NWS Raleigh, NC: flash flood warnings845040%8990%76 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 1, 3:13 PM ESTRed Flag WarningRAH26 hr
Jan 10, 10:27 PM ESTDense Fog AdvisoryRAH8 hr
Jan 15, 3:57 PM ESTWinter Storm WatchRAH11 hr
Jan 16, 3:08 AM ESTWinter Storm WarningRAH30 hr
Jan 17, 12:58 AM ESTMesoscale DiscussionSPC6 hr
Jan 17, 7:51 AM ESTMesoscale DiscussionSPC4 hr
Jan 17, 9:34 AM ESTWinter Weather AdvisoryRAH2 hr
Jan 18, 4:26 AM ESTWinter Storm WatchRAH12 hr
Jan 18, 4:39 PM ESTWinter Weather AdvisoryRAH31 hr
Jan 21, 3:41 PM ESTWinter Weather AdvisoryRAH21 hr
Jan 23, 4:58 AM ESTDense Fog AdvisoryRAH4 hr
Jan 24, 2:11 AM ESTDense Fog AdvisoryRAH7 hr
Feb 9, 5:15 AM ESTFire Weather WatchRAH10 hr
Feb 9, 3:02 PM ESTRed Flag WarningRAH30 hr
Feb 10, 10:30 AM ESTWind AdvisoryRAH11 hr
Feb 18, 7:37 PM ESTRed Flag WarningRAH22 hr
Feb 19, 4:29 PM ESTRed Flag WarningRAH27 hr
Feb 21, 4:01 AM ESTWinter Weather AdvisoryRAH29 hr
Feb 23, 5:19 AM ESTDense Fog AdvisoryRAH5 hr
Mar 4, 4:31 PM ESTTornado WatchSPC8 hr
Mar 4, 8:12 PM ESTSevere Thunderstorm WarningRAH63 min
Mar 7, 3:00 PM ESTWind AdvisoryRAH27 hr
Mar 27, 11:22 AM EDTRed Flag WarningRAH10 hr
Apr 12, 9:15 AM EDTSevere Thunderstorm WarningRAH30 min
Apr 12, 9:48 AM EDTMesoscale DiscussionSPC117 min
Apr 14, 7:47 PM EDTFrost AdvisoryRAH8 hr
Apr 14, 7:47 PM EDTFreeze WatchRAH20 hr
Apr 15, 3:50 PM EDTFreeze WarningRAH16 hr
Apr 16, 2:57 PM EDTFrost AdvisoryRAH17 hr
Apr 19, 9:00 PM EDTMesoscale DiscussionSPC60 min
Apr 19, 10:28 PM EDTSevere Thunderstorm WarningRAH26 min
May 8, 6:12 PM EDTMesoscale DiscussionSPC63 min
May 8, 7:20 PM EDTTornado WatchSPC8 hr
May 8, 9:47 PM EDTMesoscale DiscussionSPC58 min
May 8, 9:49 PM EDTSevere Thunderstorm WarningRAH56 min
May 8, 10:16 PM EDTTornado WarningRAH44 min
May 8, 10:56 PM EDTAreal Flood AdvisoryRAH3 hr
May 8, 10:58 PM EDTSevere Thunderstorm WarningRAH47 min
May 8, 11:09 PM EDTTornado WarningRAH51 min
May 8, 11:31 PM EDTFlash Flood WarningRAH3 hr
May 9, 12:00 AM EDTSevere Thunderstorm WarningRAH45 min
May 9, 2:32 AM EDTMesoscale DiscussionSPC88 min
May 9, 3:00 AM EDTTornado WatchSPC8 hr
May 9, 11:08 PM EDTSevere Thunderstorm WatchSPC4 hr
May 11, 2:07 PM EDTTornado WatchSPC6 hr
May 11, 7:47 PM EDTSevere Thunderstorm WatchSPC3 hr
May 11, 7:51 PM EDTSevere Thunderstorm WarningRAH39 min
May 12, 4:06 AM EDTWind AdvisoryRAH11 hr
May 20, 1:09 PM EDTSevere Thunderstorm WatchSPC7 hr
May 31, 4:23 PM EDTTornado WatchSPC4 hr
May 31, 5:23 PM EDTSevere Thunderstorm WarningRAH67 min
Jun 3, 3:54 PM EDTMesoscale DiscussionSPC96 min
Jun 11, 10:50 PM EDTFlash Flood WarningRAH2 hr
Jun 14, 12:10 PM EDTMesoscale DiscussionSPC95 min
Jun 16, 6:55 PM EDTMesoscale DiscussionSPC95 min
Jun 22, 1:15 PM EDTSevere Thunderstorm WatchSPC11 hr
Jun 22, 4:28 PM EDTMesoscale DiscussionSPC92 min
Jun 22, 10:22 PM EDTFlash Flood WatchRAH3 hr
Jun 27, 3:12 PM EDTSevere Thunderstorm WarningRAH63 min
Jun 28, 6:11 PM EDTSevere Thunderstorm WarningRAH49 min
Jun 29, 1:35 PM EDTSevere Thunderstorm WatchSPC7 hr
Jun 29, 4:46 PM EDTMesoscale DiscussionSPC59 min
Jul 6, 3:01 PM EDTSevere Thunderstorm WarningRAH34 min
Jul 6, 5:24 PM EDTSevere Thunderstorm WarningRAH24 min
Jul 7, 1:20 PM EDTMesoscale DiscussionSPC55 min
Jul 8, 6:34 PM EDTSevere Thunderstorm WatchSPC4 hr
Jul 9, 3:34 PM EDTSevere Thunderstorm WarningRAH41 min
Jul 9, 4:37 PM EDTSevere Thunderstorm WatchSPC5 hr
Jul 9, 6:41 PM EDTMesoscale DiscussionSPC94 min
Jul 22, 5:40 PM EDTFlash Flood WarningRAH3 hr
Jul 22, 6:03 PM EDTSevere Thunderstorm WarningRAH57 min
Jul 23, 3:25 PM EDTSevere Thunderstorm WatchSPC8 hr
Jul 23, 6:04 PM EDTSevere Thunderstorm WarningRAH46 min
Jul 27, 1:04 PM EDTSevere Thunderstorm WatchSPC7 hr
Jul 27, 1:26 PM EDTMesoscale DiscussionSPC2 hr
Jul 31, 1:24 PM EDTMesoscale DiscussionSPC66 min
Jul 31, 1:40 PM EDTSevere Thunderstorm WarningRAH50 min
Jul 31, 1:53 PM EDTSevere Thunderstorm WatchSPC5 hr
Aug 2, 12:02 PM EDTSevere Thunderstorm WatchSPC8 hr
Aug 2, 2:14 PM EDTSevere Thunderstorm WarningRAH61 min
Aug 2, 2:30 PM EDTMesoscale DiscussionSPC90 min
Aug 2, 2:44 PM EDTAreal Flood AdvisoryRAH2 hr
Aug 2, 3:11 PM EDTSevere Thunderstorm WarningRAH64 min
Aug 2, 6:26 PM EDTMesoscale DiscussionSPC94 min
Aug 14, 2:37 AM EDTDense Fog AdvisoryRAH6 hr
Aug 15, 12:50 PM EDTMesoscale DiscussionSPC85 min
Aug 15, 1:18 PM EDTSevere Thunderstorm WatchSPC8 hr
Aug 15, 3:56 PM EDTMesoscale DiscussionSPC94 min
Aug 15, 4:31 PM EDTAreal Flood AdvisoryRAH104 min
Aug 17, 3:32 AM EDTAreal Flood AdvisoryRAH118 min
Aug 27, 4:52 AM EDTMesoscale DiscussionSPC83 min
Aug 27, 7:24 AM EDTAreal Flood AdvisoryRAH111 min
Aug 27, 9:16 AM EDTTornado WatchSPC8 hr
Aug 27, 10:17 AM EDTFlash Flood WarningRAH103 min
Aug 27, 11:01 AM EDTFlash Flood WatchRAH13 hr
Aug 27, 12:24 PM EDTMesoscale DiscussionSPC66 min
Aug 27, 2:34 PM EDTMesoscale DiscussionSPC56 min
Aug 27, 4:26 PM EDTMesoscale DiscussionSPC34 min
Aug 30, 3:48 PM EDTAreal Flood AdvisoryRAH56 min
Aug 30, 3:58 PM EDTFlash Flood WarningRAH42 min
Sep 5, 3:11 PM EDTFlash Flood WatchRAH21 hr
Sep 9, 1:41 PM EDTMesoscale DiscussionSPC64 min
Sep 9, 2:05 PM EDTSevere Thunderstorm WatchSPC6 hr
Sep 9, 4:49 PM EDTMesoscale DiscussionSPC86 min
Sep 12, 4:07 AM EDTDense Fog AdvisoryRAH5 hr
Sep 24, 3:39 PM EDTWind AdvisoryRAH35 hr
Sep 26, 8:48 PM EDTAreal Flood AdvisoryRAH117 min
Sep 28, 1:49 AM EDTDense Fog AdvisoryRAH8 hr
Oct 19, 3:53 AM EDTFrost AdvisoryRAH28 hr
Oct 22, 3:22 AM EDTFrost AdvisoryRAH30 hr
Oct 27, 3:47 PM EDTFreeze WatchRAH12 hr
Oct 28, 4:02 AM EDTFreeze WarningRAH29 hr
Oct 29, 10:29 AM EDTFrost AdvisoryRAH5 hr
Oct 29, 3:49 PM EDTFreeze WarningRAH17 hr
Nov 13, 9:31 PM ESTDense Fog AdvisoryRAH11 hr
Nov 21, 2:35 AM ESTWinter Weather AdvisoryRAH4 hr
Dec 10, 3:09 PM ESTFlash Flood WatchRAH29 hr
Dec 11, 10:01 AM ESTMesoscale DiscussionSPC119 min
Dec 17, 11:56 PM ESTDense Fog AdvisoryRAH11 hr
Dec 18, 2:50 PM ESTDense Fog AdvisoryRAH20 hr
Dec 27, 5:34 PM ESTDense Fog AdvisoryRAH12 hr
Dec 31, 3:29 AM ESTWind AdvisoryRAH12 hr
Dec 31, 11:37 AM ESTRed Flag WarningRAH6 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 archive20072009

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.