Alert archive / North Carolina
Weather alerts in North Carolina, 2010
4,255 weather alerts in 2010, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered any part of the state, so the counties below add up to more than the state.
Weather alerts by county
Each county as a circle sized by its count in 2010. Tap one for its archive.
- Alerts
- 4,255
- Warnings
- 1,482
- Watches
- 159
- Advisories
- 895
- Busiest month
- July775 alerts
- Busiest day
- August 5, 2010118 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
18 of 111 tornado warnings covering North Carolina in 2010 had a tornado report inside them; 31 of 39 tornado reports fell inside a warning, on average 19 minutes after it went out.
North Carolina, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 111 | 18 | 84% | 39 | 79% | 19 min |
| Severe thunderstorm warnings | 767 | 569 | 26% | 1,199 | 82% | 23 min |
| Flash flood warnings | 173 | 109 | 37% | 302 | 85% | 113 min |
Each office's whole area, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Raleigh, NC: tornado warnings | 27 | 9 | 67% | 21 | 100% | 19 min |
| NWS Raleigh, NC: severe thunderstorm warnings | 259 | 187 | 28% | 476 | 87% | 22 min |
| NWS Raleigh, NC: flash flood warnings | 73 | 40 | 45% | 112 | 83% | 86 min |
| NWS Greenville-Spartanburg, SC: tornado warnings | 50 | 11 | 78% | 16 | 81% | 16 min |
| NWS Greenville-Spartanburg, SC: severe thunderstorm warnings | 470 | 362 | 23% | 722 | 81% | 25 min |
| NWS Greenville-Spartanburg, SC: flash flood warnings | 56 | 39 | 30% | 99 | 88% | 108 min |
| NWS Blacksburg, VA: tornado warnings | 31 | 2 | 94% | 7 | 43% | 3 min |
| NWS Blacksburg, VA: severe thunderstorm warnings | 344 | 275 | 20% | 845 | 76% | 23 min |
| NWS Blacksburg, VA: flash flood warnings | 111 | 62 | 44% | 205 | 90% | 130 min |
| NWS Wilmington, NC: tornado warnings | 4 | 1 | 75% | 6 | 67% | 13 min |
| NWS Wilmington, NC: severe thunderstorm warnings | 78 | 54 | 31% | 123 | 72% | 16 min |
| NWS Wilmington, NC: flash flood warnings | 14 | 13 | 7% | 58 | 79% | 198 min |
| NWS Morristown, TN: tornado warnings | 30 | 6 | 80% | 9 | 89% | 20 min |
| NWS Morristown, TN: severe thunderstorm warnings | 212 | 158 | 25% | 289 | 79% | 22 min |
| NWS Morristown, TN: flash flood warnings | 23 | 12 | 48% | 23 | 78% | 67 min |
| NWS Newport/Morehead City, NC: tornado warnings | 9 | 0 | 100% | 2 | 0% | |
| NWS Newport/Morehead City, NC: severe thunderstorm warnings | 41 | 23 | 44% | 54 | 80% | 25 min |
| NWS Newport/Morehead City, NC: flash flood warnings | 1 | 1 | 0% | 6 | 50% | 43 min |
| NWS Wakefield, VA: tornado warnings | 50 | 6 | 88% | 16 | 56% | 19 min |
| NWS Wakefield, VA: severe thunderstorm warnings | 170 | 133 | 22% | 362 | 82% | 23 min |
| NWS Wakefield, VA: flash flood warnings | 11 | 9 | 18% | 18 | 89% | 94 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
4,255 alerts are too many to list on one page. Narrow it to a product above, to a month in the chart, or to a county.
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Wake County231
- Burke County214
- Johnston County208
- Henderson County205
- Guilford County204
- Mecklenburg County203
- Caldwell County202
- Transylvania County199
- Iredell County195
- Durham County194
- Alleghany County190
- Rockingham County189
- Watauga County189
- Rowan County187
- Ashe County187
- Surry County186
- Forsyth County185
- Catawba County184
- Nash County184
- McDowell County182
- Granville County181
- Cabarrus County179
- Davidson County179
- Buncombe County179
- Rutherford County178
- Orange County178
- Wilkes County177
- Edgecombe County177
- Stokes County176
- Franklin County175
- Jackson County174
- Halifax County174
- Sampson County172
- Cleveland County171
- Randolph County170
- Cumberland County170
- Alamance County169
- Person County169
- Gaston County168
- Wayne County168
60 more counties
- Lincoln County167
- Montgomery County167
- Stanly County167
- Wilson County167
- Avery County164
- Harnett County164
- Chatham County164
- Caswell County163
- Richmond County163
- Vance County163
- Warren County163
- Bladen County162
- Moore County160
- Haywood County158
- Union County155
- Yadkin County155
- Currituck County154
- Davie County153
- Yancey County152
- Robeson County151
- Polk County150
- Mitchell County150
- Hoke County150
- Scotland County150
- Pasquotank County147
- Anson County147
- Columbus County145
- Lee County145
- Macon County144
- Alexander County143
- Camden County143
- Hertford County142
- Madison County142
- Swain County141
- Bertie County136
- Perquimans County134
- Gates County130
- Graham County130
- Chowan County129
- Northampton County128
- Beaufort County125
- Jones County125
- Lenoir County113
- Pitt County111
- Duplin County108
- Cherokee County107
- Martin County107
- Washington County106
- Pender County106
- Pamlico County105
- Greene County104
- Brunswick County103
- Clay County101
- Hyde County100
- Dare County89
- Craven County88
- Tyrrell County86
- New Hanover County78
- Onslow County74
- Carteret County54
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20092011
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.