The record
Everything the slot carries, as measured. Series arrays are drawn above and listed here in full.
| Event typeevent_type | Heavy Rain |
|---|---|
| NOAA NCEI event IDncei_event_id | 892,082 |
| Episode IDepisode_id | 148,112 |
| Begin UTCbegin_utc | 2020-05-20T12:00:00+00:00 |
| End UTCend_utc | 2020-05-21T12:00:00+00:00 |
| Statestate | VIRGINIA |
| County/zone typecz_type | C |
| County/zone namecz_name | ROANOKE |
| Latitudelat | 37.362 |
| Longitudelon | -79.959 |
| End latitudeend_lat | 37.362 |
| End longitudeend_lon | -79.959 |
| Deaths directdeaths_direct | 0 |
| Deaths indirectdeaths_indirect | 0 |
| Injuries directinjuries_direct | 0 |
| Injuries indirectinjuries_indirect | 0 |
| Damage propertydamage_property | 0.00K |
| Damage cropsdamage_crops | 0.00K |
| Weather forecast office sourcewfo_source | COOP Observer |
| Episode narrativeepisode_narrative | An upper-level low became cut-off over the southern Appalachian region for several days leading to persistent rainfall and eventually some flooding. Four-day (96-hour) rainfall amounts ending at 800 AM EDT on May 22nd ranged from 3 to over 12 inches in the most favored locations. Some of the 11-inch+, 4-day rain totals in Roanoke County were within the 200-year recurrence interval (9.78 to 11.8 inches) per NOAA Atlas 14. The flooding that ensued was almost all in the form of river flooding that took several days to develop. Nearly every major river basin saw some flooding, but the most notable occurred in the New River basin where crests ranged from the 4th to 8th highest on record at the Virginia gaging stations along the river. Stages on the upper New were higher than in October 2018 when the remains of Hurricane Michael transited the region. The incredible rainfall, runoff and numerous debris flows produced widespread damage to roads in the region with VDOT reporting over $5 million in damages. |
| Event narrativeevent_narrative | The NWS Cooperative station at Roanoke 8 N (ROAV2) had its wettest May day on record with 3.41 inches for the 24-hour period ending 700 AM EST on May 21st. The previous May record was 2.40 inches set the day before, May 20, 2020. Records for 3-day rainfall, at 7.99 inches and 4-day rainfall at 9.62 inches, both ending 700 AM on May 22nd were also established at this site. For a 4-day period this rainfall total is in the 90 percent confidence interval (8.81 to 10.50 inches) for a 100-year recurrence (.01 annual exceedance probability). Complete data extends only back to 1998 at this site. Among other impacts, the persistent rainfall caused the nearby Carvins Cove Reservoir to overtop the emergency spillway for only the 2nd time since 1928 and the first time since the flood of November, 1985. |
| Yearyear | 2,020 |
Provenance
This slot's source list is not carried on the manifest row; open the dossier below.
Storage: spine