Alert archive / North Carolina / Onslow County

Weather alerts in Onslow County, North Carolina, 2009

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

Onslow County and its neighbors

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

Alerts
109
Warnings
34
Watches
19
Advisories
12
Busiest month
May23 alerts
Busiest day
July 24, 20099 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 1 tornado warnings covering Onslow County in 2009 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 27 minutes after it went out.

Onslow County, 2009

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings110%1100%27 min
Severe thunderstorm warnings25676%633%14 min
Flash flood warnings00

Each office's whole area, 2009

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Newport/Morehead City, NC: tornado warnings33973%1878%22 min
NWS Newport/Morehead City, NC: severe thunderstorm warnings1263870%8883%20 min
NWS Newport/Morehead City, NC: flash flood warnings010%

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 7, 5:23 PM ESTSevere Thunderstorm WarningMHX52 min
Jan 7, 6:35 PM ESTSevere Thunderstorm WarningMHX25 min
Jan 28, 5:37 PM ESTMesoscale DiscussionSPC83 min
Mar 27, 5:55 PM EDTMesoscale DiscussionSPC65 min
Mar 28, 4:53 PM EDTMesoscale DiscussionSPC67 min
Mar 28, 5:38 PM EDTTornado WatchSPC6 hr
Mar 28, 8:06 PM EDTMesoscale DiscussionSPC84 min
Apr 6, 3:37 AM EDTMesoscale DiscussionSPC83 min
Apr 6, 8:03 AM EDTTornado WatchSPC7 hr
Apr 6, 10:33 AM EDTMesoscale DiscussionSPC57 min
Apr 10, 11:20 PM EDTSevere Thunderstorm WatchSPC6 hr
Apr 11, 1:48 AM EDTMesoscale DiscussionSPC57 min
Apr 14, 11:22 AM EDTMesoscale DiscussionSPC83 min
Apr 20, 12:22 PM EDTMesoscale DiscussionSPC83 min
Apr 20, 3:16 PM EDTSevere Thunderstorm WatchSPC6 hr
Apr 20, 4:55 PM EDTMesoscale DiscussionSPC95 min
Apr 20, 5:58 PM EDTSevere Thunderstorm WarningMHX28 min
Apr 20, 7:36 PM EDTMesoscale DiscussionSPC84 min
May 4, 1:15 PM EDTMesoscale DiscussionSPC60 min
May 4, 1:30 PM EDTSevere Thunderstorm WatchSPC9 hr
May 4, 4:33 PM EDTMesoscale DiscussionSPC57 min
May 4, 6:15 PM EDTMesoscale DiscussionSPC60 min
May 4, 7:39 PM EDTSevere Thunderstorm WatchSPC3 hr
May 4, 9:08 PM EDTMesoscale DiscussionSPC97 min
May 5, 9:43 AM EDTMesoscale DiscussionSPC92 min
May 5, 10:18 AM EDTSevere Thunderstorm WatchSPC8 hr
May 5, 12:32 PM EDTSevere Thunderstorm WarningMHX43 min
May 5, 5:37 PM EDTMesoscale DiscussionSPC53 min
May 5, 5:45 PM EDTTornado WatchSPC5 hr
May 7, 5:17 AM EDTMesoscale DiscussionSPC118 min
May 7, 5:55 PM EDTSevere Thunderstorm WarningMHX50 min
May 7, 6:10 PM EDTSevere Thunderstorm WatchSPC6 hr
May 7, 6:33 PM EDTTornado WarningMHX42 min
May 7, 7:33 PM EDTMesoscale DiscussionSPC57 min
May 8, 2:02 PM EDTSevere Thunderstorm WatchSPC4 hr
May 9, 6:25 PM EDTSevere Thunderstorm WatchSPC4 hr
May 17, 4:02 PM EDTAreal Flood AdvisoryMHX3 hr
May 17, 4:35 PM EDTSevere Thunderstorm WarningMHX40 min
May 29, 2:22 PM EDTMesoscale DiscussionSPC23 min
May 29, 2:41 PM EDTSevere Thunderstorm WatchSPC8 hr
May 29, 6:01 PM EDTMesoscale DiscussionSPC59 min
Jun 9, 2:31 PM EDTMesoscale DiscussionSPC89 min
Jun 12, 4:49 PM EDTSevere Thunderstorm WatchSPC6 hr
Jun 12, 8:20 PM EDTMesoscale DiscussionSPC55 min
Jun 13, 6:01 PM EDTSevere Thunderstorm WarningMHX44 min
Jun 15, 1:26 PM EDTMesoscale DiscussionSPC64 min
Jun 15, 6:42 PM EDTMesoscale DiscussionSPC63 min
Jun 23, 12:22 AM EDTSevere Thunderstorm WarningMHX53 min
Jun 26, 1:17 PM EDTMesoscale DiscussionSPC58 min
Jun 26, 4:02 PM EDTSevere Thunderstorm WarningMHX43 min
Jun 26, 4:45 PM EDTSevere Thunderstorm WarningMHX22 min
Jun 27, 3:16 PM EDTSevere Thunderstorm WatchSPC7 hr
Jul 1, 9:38 PM EDTSevere Thunderstorm WarningMHX52 min
Jul 1, 10:23 PM EDTSevere Thunderstorm WarningMHX33 min
Jul 5, 5:43 PM EDTSevere Thunderstorm WarningMHX18 min
Jul 16, 1:31 PM EDTMesoscale DiscussionSPC89 min
Jul 17, 2:42 PM EDTSevere Thunderstorm WatchSPC7 hr
Jul 17, 6:45 PM EDTMesoscale DiscussionSPC60 min
Jul 17, 9:15 PM EDTMesoscale DiscussionSPC60 min
Jul 23, 5:19 PM EDTSevere Thunderstorm WarningMHX41 min
Jul 24, 12:23 PM EDTSevere Thunderstorm WarningMHX37 min
Jul 24, 1:01 PM EDTSevere Thunderstorm WarningMHX44 min
Jul 24, 1:04 PM EDTSevere Thunderstorm WarningMHX41 min
Jul 24, 1:12 PM EDTMesoscale DiscussionSPC93 min
Jul 24, 1:30 PM EDTSevere Thunderstorm WarningMHX45 min
Jul 24, 1:44 PM EDTSevere Thunderstorm WarningMHX46 min
Jul 24, 2:22 PM EDTAreal Flood AdvisoryMHX3 hr
Jul 24, 4:20 PM EDTSevere Thunderstorm WarningMHX40 min
Jul 24, 4:26 PM EDTAreal Flood WarningMHX3 hr
Jul 27, 11:58 AM EDTMesoscale DiscussionSPC92 min
Jul 27, 12:49 PM EDTSevere Thunderstorm WatchSPC7 hr
Jul 27, 3:45 PM EDTMesoscale DiscussionSPC60 min
Jul 27, 7:06 PM EDTMesoscale DiscussionSPC54 min
Aug 5, 4:59 PM EDTSevere Thunderstorm WarningMHX46 min
Aug 5, 5:37 PM EDTSevere Thunderstorm WarningMHX23 min
Aug 6, 12:15 PM EDTMesoscale DiscussionSPC90 min
Aug 6, 2:35 PM EDTAreal Flood AdvisoryMHX3 hr
Aug 6, 3:41 PM EDTAreal Flood WarningMHX94 min
Aug 11, 6:50 PM EDTSevere Thunderstorm WarningMHX30 min
Aug 12, 11:25 AM EDTMesoscale DiscussionSPC2 hr
Aug 12, 12:23 PM EDTSevere Thunderstorm WatchSPC9 hr
Aug 12, 2:18 PM EDTAreal Flood AdvisoryMHX3 hr
Aug 12, 3:03 PM EDTAreal Flood WarningMHX4 hr
Aug 12, 4:13 PM EDTMesoscale DiscussionSPC92 min
Aug 14, 9:22 AM EDTAreal Flood AdvisoryMHX83 min
Aug 22, 11:58 AM EDTMesoscale DiscussionSPC2 hr
Aug 22, 2:20 PM EDTSevere Thunderstorm WarningMHX40 min
Aug 22, 6:03 PM EDTMesoscale DiscussionSPC57 min
Sep 7, 12:27 PM EDTAreal Flood AdvisoryMHX3 hr
Sep 7, 2:55 PM EDTAreal Flood WarningMHX3 hr
Sep 7, 6:11 PM EDTAreal Flood WarningMHX5 hr
Oct 28, 2:15 AM EDTMesoscale DiscussionSPC60 min
Nov 11, 11:31 AM ESTAreal Flood AdvisoryMHX3 hr
Nov 11, 2:18 PM ESTAreal Flood AdvisoryMHX3 hr
Nov 11, 5:15 PM ESTAreal Flood WarningMHX5 hr
Nov 11, 10:19 PM ESTAreal Flood WarningMHX6 hr
Nov 12, 2:02 AM ESTSevere Thunderstorm WarningMHX30 min
Nov 18, 11:31 PM ESTAreal Flood AdvisoryMHX3 hr
Nov 19, 2:22 AM ESTAreal Flood WarningMHX83 min
Nov 19, 4:44 AM ESTAreal Flood AdvisoryMHX3 hr
Nov 19, 7:33 AM ESTAreal Flood AdvisoryMHX3 hr
Dec 2, 2:10 PM ESTAreal Flood AdvisoryMHX3 hr
Dec 2, 5:44 PM ESTMesoscale DiscussionSPC91 min
Dec 2, 6:59 PM ESTTornado Watch PDSSPC8 hr
Dec 2, 8:31 PM ESTMesoscale DiscussionSPC89 min
Dec 3, 12:12 AM ESTMesoscale DiscussionSPC93 min
Dec 9, 2:19 AM ESTMesoscale DiscussionSPC116 min
Dec 9, 3:07 AM ESTTornado WatchSPC5 hr
Dec 9, 7:18 AM ESTMesoscale DiscussionSPC57 min

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.