Alert archive / Alabama / 2003

Weather alerts in Alabama, April 2003

235 weather alerts in April 2003, 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 April 2003. Tap one for its archive.

Alerts
235
Warnings
195
Watches
11
Advisories
0
Busiest day
April 25, 2003107 alerts

Over time

By day

Days in UTC, the clock the archive keeps.

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.

IssuedProductOfficeCountiesLasted
Apr 5, 4:40 PM CSTSevere Thunderstorm WarningMOBBaldwin, Mobile50 min
Apr 5, 4:41 PM CSTSevere Thunderstorm WarningBMXBarbour34 min
Apr 5, 4:44 PM CSTSevere Thunderstorm WarningMOBWashington46 min
Apr 5, 4:55 PM CSTSevere Thunderstorm WarningBMXPike50 min
Apr 5, 5:00 PM CSTSevere Thunderstorm WarningMOBButler, Crenshaw60 min
Apr 5, 5:15 PM CSTSevere Thunderstorm WarningBMXBarbour30 min
Apr 5, 6:15 PM CSTSevere Thunderstorm WarningMOBCovington30 min
Apr 6, 9:19 AM CDTMesoscale DiscussionSPCLimestone, Madison116 min
Apr 6, 12:40 PM CDTMesoscale DiscussionSPCGreene, Hale, Marengo, Perry, Pickens, Sumter and 1 more2 hr
Apr 6, 1:20 PM CDTSevere Thunderstorm WatchSPCLauderdale6 hr
Apr 6, 1:35 PM CDTTornado WatchSPCBibb, Butler, Chilton, Choctaw, Clarke, Dallas and 8 more5 hr
Apr 6, 2:56 PM CDTMesoscale DiscussionSPCBibb, Chilton, Dallas, Greene, Hale, Perry and 4 more2 hr
Apr 6, 3:23 PM CDTSevere Thunderstorm WarningBMXGreene, Pickens, Sumter67 min
Apr 6, 3:36 PM CDTTornado WarningBMXSumter39 min
Apr 6, 4:13 PM CDTTornado WarningBMXGreene, Sumter47 min
Apr 6, 4:52 PM CDTTornado WarningBMXHale53 min
Apr 6, 4:54 PM CDTTornado WarningBMXSumter66 min
Apr 6, 4:58 PM CDTTornado WarningBMXGreene22 min
Apr 6, 6:06 PM CDTTornado WarningBMXHale9 min
Apr 6, 6:11 PM CDTTornado WarningBMXTuscaloosa49 min
Apr 6, 6:23 PM CDTMesoscale DiscussionSPCBibb, Blount, Choctaw, Cullman, Fayette, Franklin and 14 more97 min
Apr 6, 6:50 PM CDTTornado WatchSPCAutauga, Bibb, Chilton, Choctaw, Cullman, Dallas and 12 more6 hr
Apr 6, 7:01 PM CDTTornado WarningBMXTuscaloosa29 min
Apr 6, 7:24 PM CDTTornado WarningBMXJefferson51 min
Apr 6, 8:13 PM CDTMesoscale DiscussionSPCBibb, Chilton, Choctaw, Dallas, Fayette, Greene and 8 more2 hr
Apr 6, 9:48 PM CDTMesoscale DiscussionSPCAutauga, Chilton, Choctaw, Clarke, Dallas, Hale and 6 more87 min
Apr 6, 10:15 PM CDTTornado WatchSPCAutauga, Butler, Choctaw, Clarke, Conecuh, Covington and 10 more5 hr
Apr 6, 10:23 PM CDTSevere Thunderstorm WarningHUNFranklin22 min
Apr 6, 10:25 PM CDTTornado WarningMOBChoctaw65 min
Apr 6, 11:19 PM CDTSevere Thunderstorm WarningMOBClarke56 min
Apr 6, 11:31 PM CDTSevere Thunderstorm WarningBMXMarengo44 min
Apr 6, 11:39 PM CDTMesoscale DiscussionSPCAutauga, Butler, Choctaw, Clarke, Conecuh, Covington and 11 more2 hr
Apr 7, 12:29 AM CDTSevere Thunderstorm WarningMOBWilcox46 min
Apr 7, 12:37 AM CDTTornado WarningMOBWilcox23 min
Apr 7, 12:47 AM CDTTornado WarningBMXDallas58 min
Apr 7, 1:03 AM CDTTornado WarningMOBWilcox42 min
Apr 7, 1:28 AM CDTTornado WarningBMXLowndes62 min
Apr 7, 1:51 AM CDTMesoscale DiscussionSPCBullock, Butler, Lowndes, Macon, Montgomery54 min
Apr 7, 2:26 AM CDTTornado WarningBMXLowndes, Montgomery64 min
Apr 7, 2:55 AM CDTTornado WatchSPCAutauga, Barbour, Bullock, Chilton, Choctaw, Dallas and 13 more4 hr
Apr 7, 2:56 AM CDTSevere Thunderstorm WarningBMXSumter34 min
Apr 7, 3:05 AM CDTTornado WarningBMXSumter25 min
Apr 7, 3:15 AM CDTTornado WarningBMXMarengo30 min
Apr 7, 3:30 AM CDTTornado WarningBMXMacon, Montgomery60 min
Apr 7, 3:42 AM CDTFlash Flood WarningBMXSumter4 hr
Apr 7, 3:46 AM CDTTornado WarningBMXMarengo19 min
Apr 7, 3:51 AM CDTTornado WarningBMXBullock29 min
Apr 7, 4:02 AM CDTTornado WarningBMXDallas, Perry43 min
Apr 7, 4:24 AM CDTTornado WarningBMXMacon51 min
Apr 7, 4:42 AM CDTTornado WarningBMXSumter48 min
Apr 7, 4:49 AM CDTMesoscale DiscussionSPCAutauga, Chambers, Chilton, Coosa, Dallas, Elmore and 11 more3 hr
Apr 7, 4:54 AM CDTTornado WarningBMXLee36 min
Apr 7, 5:26 AM CDTTornado WarningBMXLee29 min
Apr 7, 5:32 AM CDTTornado WarningBMXMarengo, Sumter28 min
Apr 7, 5:43 AM CDTFlash Flood WarningBMXGreene, Hale4 hr
Apr 7, 5:58 AM CDTTornado WarningBMXMarengo47 min
Apr 7, 6:11 AM CDTTornado WarningBMXHale, Perry49 min
Apr 7, 6:24 AM CDTTornado WarningBMXChambers51 min
Apr 7, 6:35 AM CDTTornado WarningBMXDallas25 min
Apr 7, 6:46 AM CDTSevere Thunderstorm WarningMOBChoctaw44 min
Apr 7, 6:56 AM CDTSevere Thunderstorm WarningBMXSumter49 min
Apr 7, 6:56 AM CDTTornado WarningBMXDallas49 min
Apr 7, 7:18 AM CDTSevere Thunderstorm WarningBMXMarengo42 min
Apr 7, 7:34 AM CDTTornado WarningBMXAutauga, Lowndes41 min
Apr 7, 7:35 AM CDTFlash Flood WarningBMXSumter3 hr
Apr 7, 7:50 AM CDTFlash Flood WarningBMXMarengo3 hr
Apr 7, 7:52 AM CDTSevere Thunderstorm WarningMOBWilcox53 min
Apr 7, 7:54 AM CDTSevere Thunderstorm WarningBMXElmore, Macon, Montgomery36 min
Apr 7, 8:06 AM CDTFlash Flood WarningBMXAutauga, Chambers, Chilton, Coosa, Dallas, Elmore and 6 more3 hr
Apr 7, 8:08 AM CDTSevere Thunderstorm WarningBMXDallas37 min
Apr 7, 8:14 AM CDTTornado WarningBMXAutauga, Lowndes46 min
Apr 7, 8:24 AM CDTTornado WarningBMXMontgomery51 min
Apr 7, 8:59 AM CDTTornado WarningBMXLowndes46 min
Apr 7, 9:11 AM CDTMesoscale DiscussionSPCBarbour, Coffee, Conecuh, Covington, Crenshaw, Dale and 6 more3 hr
Apr 7, 9:22 AM CDTTornado WarningBMXMontgomery38 min
Apr 7, 9:24 AM CDTTornado WarningBMXMacon51 min
Apr 7, 9:40 AM CDTTornado WatchSPCBarbour, Bullock, Macon, Pike, Russell5 hr
Apr 7, 10:49 AM CDTFlash Flood WarningBMXAutauga, Chambers, Elmore, Lee, Lowndes, Macon and 2 more3 hr
Apr 7, 11:25 AM CDTMesoscale DiscussionSPCBaldwin, Butler, Clarke, Coffee, Conecuh, Covington and 6 more3 hr
Apr 7, 12:07 PM CDTMesoscale DiscussionSPCBaldwin, Butler, Clarke, Coffee, Conecuh, Covington and 6 more113 min
Apr 7, 12:22 PM CDTMesoscale DiscussionSPCBaldwin, Butler, Clarke, Coffee, Conecuh, Covington and 6 more113 min
Apr 7, 1:17 PM CDTSevere Thunderstorm WarningMOBMobile28 min
Apr 7, 2:34 PM CDTSevere Thunderstorm WarningBMXBarbour, Pike56 min
Apr 7, 3:40 PM CDTSevere Thunderstorm WatchSPCBaldwin, Covington, Escambia, Mobile5 hr
Apr 7, 3:42 PM CDTSevere Thunderstorm WarningMOBCovington48 min
Apr 7, 4:20 PM CDTTornado WarningTAEGeneva25 min
Apr 7, 5:23 PM CDTFlash Flood WarningMOBBaldwin3 hr
Apr 7, 5:58 PM CDTMesoscale DiscussionSPCBaldwin, Escambia, Mobile2 hr
Apr 7, 8:28 PM CDTSpecial Marine WarningMOB62 min
Apr 7, 8:28 PM CDTSpecial Marine WarningMOB62 min
Apr 7, 8:42 PM CDTSevere Thunderstorm WarningMOBMobile33 min
Apr 8, 5:40 AM CDTSpecial Marine WarningMOB65 min
Apr 8, 7:25 AM CDTSpecial Marine WarningMOB65 min
Apr 8, 10:45 AM CDTSpecial Marine WarningMOB2 hr
Apr 8, 10:45 AM CDTSpecial Marine WarningMOB2 hr
Apr 21, 4:28 PM CDTSevere Thunderstorm WarningMOBBaldwin47 min
Apr 21, 4:37 PM CDTSevere Thunderstorm WarningMOBCrenshaw38 min
Apr 21, 4:59 PM CDTMesoscale DiscussionSPCBarbour, Bullock, Coffee, Covington, Crenshaw, Dale and 7 more3 hr
Apr 21, 5:21 PM CDTSpecial Marine WarningMOB114 min
Apr 24, 2:46 PM CDTMesoscale DiscussionSPCBibb, Choctaw, Dallas, Fayette, Greene, Hale and 6 more119 min
Apr 24, 3:20 PM CDTSevere Thunderstorm WarningBMXElmore, Montgomery40 min
Apr 24, 3:52 PM CDTSevere Thunderstorm WarningBMXBullock, Macon53 min
Apr 24, 5:17 PM CDTMesoscale DiscussionSPCBaldwin, Mobile, Washington118 min
Apr 24, 8:18 PM CDTSevere Thunderstorm WarningBMXSumter42 min
Apr 24, 10:22 PM CDTFlash Flood WarningBMXGreene, Sumter4 hr
Apr 24, 10:57 PM CDTSevere Thunderstorm WarningBMXSumter33 min
Apr 24, 11:20 PM CDTTornado WarningBMXSumter10 min
Apr 24, 11:28 PM CDTSevere Thunderstorm WarningBMXGreene, Sumter32 min
Apr 24, 11:36 PM CDTSevere Thunderstorm WarningBMXMarengo39 min
Apr 24, 11:46 PM CDTSevere Thunderstorm WarningBMXHale29 min
Apr 24, 11:50 PM CDTFlash Flood WarningBMXHale4 hr
Apr 25, 12:05 AM CDTTornado WarningBMXSumter25 min
Apr 25, 12:08 AM CDTFlash Flood WarningBMXBibb, Shelby4 hr
Apr 25, 12:09 AM CDTSevere Thunderstorm WarningMOBChoctaw36 min
Apr 25, 12:30 AM CDTTornado WarningBMXSumter15 min
Apr 25, 12:31 AM CDTTornado WarningBMXMarengo44 min
Apr 25, 1:12 AM CDTFlash Flood WarningBMXChilton, Perry4 hr
Apr 25, 1:15 AM CDTMesoscale DiscussionSPCChoctaw, Clarke, Greene, Hale, Marengo, Pickens and 2 more90 min
Apr 25, 1:36 AM CDTSevere Thunderstorm WarningMOBWilcox24 min
Apr 25, 1:58 AM CDTFlash Flood WarningBMXGreene, Sumter2 hr
Apr 25, 1:59 AM CDTTornado WarningMOBWilcox31 min
Apr 25, 2:21 AM CDTSpecial Marine WarningMOB24 min
Apr 25, 3:05 AM CDTTornado WarningBMXMontgomery40 min
Apr 25, 3:05 AM CDTMesoscale DiscussionSPCBaldwin, Bibb, Butler, Choctaw, Clarke, Conecuh and 17 more85 min
Apr 25, 5:10 AM CDTSpecial Marine WarningMOB110 min
Apr 25, 5:10 AM CDTSpecial Marine WarningMOB110 min
Apr 25, 5:15 AM CDTSevere Thunderstorm WarningTAEGeneva45 min
Apr 25, 5:40 AM CDTMesoscale DiscussionSPCBaldwin, Coffee, Covington, Dale, Escambia, Geneva and 2 more65 min
Apr 25, 5:59 AM CDTSevere Thunderstorm WarningTAEDale, Henry46 min
Apr 25, 6:05 AM CDTTornado WatchSPCCoffee, Covington, Geneva, Houston6 hr
Apr 25, 6:25 AM CDTTornado WarningMOBCovington35 min
Apr 25, 6:52 AM CDTTornado WarningTAECoffee, Geneva38 min
Apr 25, 6:55 AM CDTSpecial Marine WarningMOB2 hr
Apr 25, 6:55 AM CDTSpecial Marine WarningMOB2 hr
Apr 25, 7:41 AM CDTMesoscale DiscussionSPCHouston94 min
Apr 25, 11:04 AM CDTMesoscale DiscussionSPCColbert, Franklin, Lauderdale, Marion, Winston116 min
Apr 25, 12:26 PM CDTTornado WarningBMXGreene, Sumter34 min
Apr 25, 12:45 PM CDTTornado WatchSPCAutauga, Bibb, Blount, Bullock, Butler, Calhoun and 45 more5 hr
Apr 25, 12:54 PM CDTTornado WarningBMXHale51 min
Apr 25, 12:59 PM CDTTornado WarningBMXGreene31 min
Apr 25, 12:59 PM CDTMesoscale DiscussionSPCAutauga, Bibb, Blount, Chilton, Choctaw, Coosa and 15 more2 hr
Apr 25, 1:30 PM CDTTornado WarningBMXGreene30 min
Apr 25, 1:42 PM CDTTornado WarningBMXHale48 min
Apr 25, 1:44 PM CDTTornado WarningBMXBibb, Perry31 min
Apr 25, 2:13 PM CDTTornado WarningBMXBibb, Perry47 min
Apr 25, 2:35 PM CDTTornado WarningBMXChilton55 min
Apr 25, 2:40 PM CDTSevere Thunderstorm WarningBMXHale35 min
Apr 25, 2:46 PM CDTTornado WarningBMXHale29 min
Apr 25, 2:56 PM CDTTornado WarningBMXPerry49 min
Apr 25, 3:00 PM CDTSevere Thunderstorm WarningBMXBibb30 min
Apr 25, 3:08 PM CDTMesoscale DiscussionSPCAutauga, Bibb, Blount, Bullock, Calhoun, Chambers and 24 more2 hr
Apr 25, 3:18 PM CDTSevere Thunderstorm WarningBMXCoosa42 min
Apr 25, 3:21 PM CDTSevere Thunderstorm WarningBMXAutauga24 min
Apr 25, 3:26 PM CDTTornado WarningBMXDallas49 min
Apr 25, 3:32 PM CDTSevere Thunderstorm WarningBMXElmore58 min
Apr 25, 3:33 PM CDTSevere Thunderstorm WarningBMXChilton27 min
Apr 25, 3:43 PM CDTTornado WarningBMXElmore47 min
Apr 25, 3:48 PM CDTTornado WarningBMXAutauga57 min
Apr 25, 3:51 PM CDTSevere Thunderstorm WarningBMXHale, Marengo, Perry39 min
Apr 25, 3:52 PM CDTSevere Thunderstorm WarningHUNMarshall23 min
Apr 25, 4:08 PM CDTSevere Thunderstorm WarningHUNDeKalb37 min
Apr 25, 4:14 PM CDTSevere Thunderstorm WarningHUNMarshall16 min
Apr 25, 4:16 PM CDTSevere Thunderstorm WarningBMXDallas44 min
Apr 25, 4:18 PM CDTSevere Thunderstorm WarningBMXCherokee27 min
Apr 25, 4:18 PM CDTTornado WarningBMXTallapoosa42 min
Apr 25, 4:28 PM CDTSevere Thunderstorm WarningBMXJefferson, St. Clair47 min
Apr 25, 4:29 PM CDTSevere Thunderstorm WarningBMXElmore31 min
Apr 25, 4:31 PM CDTTornado WarningBMXMontgomery44 min
Apr 25, 4:36 PM CDTSevere Thunderstorm WarningMOBChoctaw54 min
Apr 25, 4:38 PM CDTSevere Thunderstorm WarningBMXMarengo37 min
Apr 25, 4:38 PM CDTTornado WarningBMXBlount, Etowah52 min
Apr 25, 4:41 PM CDTTornado WarningBMXMacon49 min
Apr 25, 4:41 PM CDTSevere Thunderstorm WarningHUNDeKalb34 min
Apr 25, 4:43 PM CDTSevere Thunderstorm WarningBMXLee47 min
Apr 25, 4:44 PM CDTSevere Thunderstorm WarningBMXAutauga31 min
Apr 25, 4:47 PM CDTSevere Thunderstorm WarningBMXChambers28 min
Apr 25, 4:47 PM CDTTornado WarningBMXCalhoun, St. Clair, Talladega43 min
Apr 25, 4:49 PM CDTTornado WarningBMXDallas26 min
Apr 25, 4:51 PM CDTTornado WarningHUNDeKalb24 min
Apr 25, 4:56 PM CDTTornado WarningBMXCherokee, Lee49 min
Apr 25, 4:58 PM CDTSevere Thunderstorm WarningBMXElmore47 min
Apr 25, 5:09 PM CDTTornado WarningBMXMontgomery51 min
Apr 25, 5:12 PM CDTTornado WarningBMXDallas33 min
Apr 25, 5:12 PM CDTTornado WarningBMXRussell48 min
Apr 25, 5:15 PM CDTSevere Thunderstorm WarningBMXMarengo45 min
Apr 25, 5:16 PM CDTMesoscale DiscussionSPCAutauga, Barbour, Bibb, Bullock, Butler, Chilton and 15 more59 min
Apr 25, 5:20 PM CDTTornado WarningBMXBullock40 min
Apr 25, 5:26 PM CDTTornado WarningBMXMarengo34 min
Apr 25, 5:26 PM CDTTornado WarningBMXMacon49 min
Apr 25, 5:28 PM CDTSevere Thunderstorm WarningMOBWashington47 min
Apr 25, 5:29 PM CDTTornado WarningBMXLowndes46 min
Apr 25, 5:40 PM CDTTornado WatchSPCBarbour, Bullock, Butler, Choctaw, Clarke, Coffee and 10 more5 hr
Apr 25, 5:42 PM CDTSevere Thunderstorm WarningMOBWilcox63 min
Apr 25, 5:45 PM CDTSevere Thunderstorm WarningBMXDallas30 min
Apr 25, 5:54 PM CDTTornado WarningBMXCherokee21 min
Apr 25, 6:00 PM CDTSevere Thunderstorm WarningBMXMarengo45 min
Apr 25, 6:00 PM CDTTornado WarningBMXBullock, Russell45 min
Apr 25, 6:06 PM CDTSevere Thunderstorm WarningBMXMontgomery39 min
Apr 25, 6:10 PM CDTTornado WarningMOBWashington35 min
Apr 25, 6:12 PM CDTSevere Thunderstorm WarningBMXLowndes33 min
Apr 25, 6:12 PM CDTTornado WarningBMXBarbour48 min
Apr 25, 6:18 PM CDTSevere Thunderstorm WarningBMXAutauga, Dallas42 min
Apr 25, 6:20 PM CDTTornado WarningBMXMontgomery25 min
Apr 25, 6:40 PM CDTTornado WarningBMXRussell35 min
Apr 25, 6:42 PM CDTSevere Thunderstorm WarningBMXLowndes63 min
Apr 25, 6:45 PM CDTSevere Thunderstorm WarningBMXBullock, Macon45 min
Apr 25, 6:45 PM CDTTornado WarningBMXMontgomery45 min
Apr 25, 6:50 PM CDTSevere Thunderstorm WarningMOBMobile40 min
Apr 25, 6:57 PM CDTSevere Thunderstorm WarningBMXPike33 min
Apr 25, 6:58 PM CDTSevere Thunderstorm WarningBMXBarbour62 min
Apr 25, 7:15 PM CDTSevere Thunderstorm WarningBMXRussell45 min
Apr 25, 7:15 PM CDTTornado WarningMOBMobile45 min
Apr 25, 7:21 PM CDTTornado WarningBMXPike24 min
Apr 25, 7:22 PM CDTSevere Thunderstorm WarningMOBButler23 min
Apr 25, 7:22 PM CDTMesoscale DiscussionSPCCoffee, Covington, Dale, Geneva, Henry, Houston113 min
Apr 25, 7:25 PM CDTSevere Thunderstorm WarningMOBEscambia50 min
Apr 25, 7:29 PM CDTSevere Thunderstorm WarningBMXBullock31 min
Apr 25, 7:35 PM CDTSevere Thunderstorm WarningBMXMontgomery25 min
Apr 25, 7:35 PM CDTSevere Thunderstorm WarningMOBConecuh, Monroe25 min
Apr 25, 7:38 PM CDTSevere Thunderstorm WarningMOBBaldwin52 min
Apr 25, 7:43 PM CDTTornado WarningBMXPike32 min
Apr 25, 7:44 PM CDTSevere Thunderstorm WarningMOBButler46 min
Apr 25, 7:51 PM CDTMesoscale DiscussionSPCRussell54 min
Apr 25, 7:55 PM CDTSevere Thunderstorm WarningMOBMobile35 min
Apr 25, 7:57 PM CDTSevere Thunderstorm WarningBMXBarbour48 min
Apr 25, 8:00 PM CDTSevere Thunderstorm WarningMOBCrenshaw45 min
Apr 25, 8:13 PM CDTSevere Thunderstorm WarningBMXPike32 min
Apr 25, 8:13 PM CDTTornado WarningBMXBarbour47 min
Apr 25, 8:26 PM CDTSpecial Marine WarningMOB2 hr
Apr 25, 8:28 PM CDTSevere Thunderstorm WarningMOBBaldwin, Mobile47 min
Apr 25, 9:00 PM CDTSevere Thunderstorm WatchSPCBaldwin, Barbour, Butler, Coffee, Conecuh, Covington and 9 more5 hr
Apr 25, 9:14 PM CDTSevere Thunderstorm WarningMOBBaldwin46 min
Apr 25, 11:24 PM CDTMesoscale DiscussionSPCDale, Geneva, Henry, Houston96 min
Apr 26, 1:12 AM CDTMesoscale DiscussionSPCHouston63 min
Apr 30, 5:00 PM CDTSevere Thunderstorm WarningMOBEscambia30 min

By product

Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.

ProductAlerts
Severe storms
Severe Thunderstorm Warning85
Tornado Warning85
Severe Thunderstorm Watch3
Tornado Watch8
Mesoscale Discussion29
Flooding
Flash Flood Warning12
Marine
Special Marine Warning13

By county

Every county with at least one alert. A county page lists each alert that covered it.

27 more counties

Nearby

Alerts in force nowTornadoes on recordThe radar archive20022004

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. Rebuilt daily.