Alert archive / Puerto Rico / Flash Flood Warnings

Flash Flood Warnings in Puerto Rico, 2013

38 flash flood warnings in 2013. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of flash flood warnings reaches back to 1986.

Flash Flood Warnings
38
Busiest month
May15 flash flood warnings
Busiest day
July 18, 20138 flash flood warnings

Over time

By month

Warning verification

How often warnings here had a storm report inside them, and how much warning the reports had.

16 of 38 flash flood warnings covering Puerto Rico in 2013 had a flash flood report inside them; 33 of 63 flash flood reports fell inside a warning, on average 55 minutes after it went out.

Puerto Rico, 2013

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Flash flood warnings381658%6352%55 min

Each office's whole area, 2013

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS JSJ: flash flood warnings411759%6655%55 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, Central Time. Each opens its own page with the text, the map, the radar and the sounding.

IssuedProductOfficeCountiesLasted
Mar 29, 1:22 PM CDTFlash Flood WarningJSJ3 hr
Mar 29, 2:04 PM CDTFlash Flood WarningJSJ3 hr
Mar 29, 4:49 PM CDTFlash Flood WarningJSJ116 min
Apr 30, 1:13 PM CDTFlash Flood WarningJSJ2 hr
May 6, 3:37 PM CDTFlash Flood WarningJSJ6 hr
May 7, 2:33 PM CDTFlash Flood WarningJSJ6 hr
May 7, 3:18 PM CDTFlash Flood WarningJSJ7 hr
May 7, 3:48 PM CDTFlash Flood WarningJSJ11 hr
May 7, 4:41 PM CDTFlash Flood WarningJSJ3 hr
May 8, 3:56 PM CDTFlash Flood WarningJSJ3 hr
May 9, 4:54 AM CDTFlash Flood WarningJSJ3 hr
May 10, 3:43 PM CDTFlash Flood WarningJSJ4 hr
May 10, 4:29 PM CDTFlash Flood WarningJSJ5 hr
May 10, 7:26 PM CDTFlash Flood WarningJSJ3 hr
May 14, 11:22 AM CDTFlash Flood WarningJSJ5 hr
May 15, 12:46 PM CDTFlash Flood WarningJSJ119 min
May 16, 3:05 PM CDTFlash Flood WarningJSJ85 min
May 21, 3:16 PM CDTFlash Flood WarningJSJ2 hr
May 27, 5:37 PM CDTFlash Flood WarningJSJ3 hr
Jun 12, 2:01 PM CDTFlash Flood WarningJSJ3 hr
Jul 13, 5:19 PM CDTFlash Flood WarningJSJ3 hr
Jul 18, 11:26 AM CDTFlash Flood WarningJSJ3 hr
Jul 18, 11:35 AM CDTFlash Flood WarningJSJ2 hr
Jul 18, 11:52 AM CDTFlash Flood WarningJSJ2 hr
Jul 18, 12:40 PM CDTFlash Flood WarningJSJ3 hr
Jul 18, 2:31 PM CDTFlash Flood WarningJSJ3 hr
Jul 18, 3:13 PM CDTFlash Flood WarningJSJ3 hr
Jul 18, 3:59 PM CDTFlash Flood WarningJSJ3 hr
Jul 18, 4:11 PM CDTFlash Flood WarningJSJ5 hr
Aug 6, 5:14 PM CDTFlash Flood WarningJSJ2 hr
Aug 23, 12:45 PM CDTFlash Flood WarningJSJ2 hr
Aug 29, 2:24 PM CDTFlash Flood WarningJSJ3 hr
Oct 6, 2:27 PM CDTFlash Flood WarningJSJ2 hr
Nov 30, 3:31 PM CSTFlash Flood WarningJSJ3 hr
Dec 5, 7:03 AM CSTFlash Flood WarningJSJ3 hr
Dec 5, 7:24 AM CSTFlash Flood WarningJSJ2 hr
Dec 24, 5:49 PM CSTFlash Flood WarningJSJ3 hr
Dec 24, 9:35 PM CSTFlash Flood WarningJSJ4 hr

The busiest days

Days with the most alerts issued, by UTC date.

  1. July 18, 20138flash flood warnings
  2. May 7, 20134flash flood warnings
  3. March 29, 20133flash flood warnings
  4. May 10, 20132flash flood warnings
  5. December 5, 20132flash flood warnings
  6. April 30, 20131flash flood warnings
  7. May 6, 20131flash flood warnings
  8. May 8, 20131flash flood warnings
  9. May 9, 20131flash flood warnings
  10. May 11, 20131flash flood warnings
  11. May 14, 20131flash flood warnings
  12. May 15, 20131flash flood warnings

Nearby

Alerts in force nowTornadoes on recordThe radar archive20122014

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.