Alert archive / Utah / Flash Flood Warnings in 2011
Flash Flood Warning 30, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Aug 15, 2011, 3:13 PM MDT for Wayne County, Utah. It was in force for 3 hr. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 15, 2011, 3:13 PM MDT (21:13 UTC)
- Expired
- Aug 15, 2011, 6:15 PM MDT
- In force
- 3 hr
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Flood severity
- None
County Wayne County, UT
The radar
The Cedar City radar (KICX), 160 km from the middle of the area, began a volume at 21:15 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 15, 4:00 PM MDT | FLASH FLOOD | 2 Sw Capitol Reef Np, UT | FLASH FLOODING OCCURRED IN GRAND WASH IN CAPITOL REEF NATIONAL PARK...AND WATER WENT OVER HIGHWAY 24 WHERE THE GRAND WASH MEETS THE ROAD. IN ADDITION...PARK RANGERS REPORTED FLASH FLOODING ALONG THE FREMONT RIVER. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Salt Lake City I, UT (KSLC), launched 12:00Z, 9.2 hours before the alert went out and 289 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 113 J/kg
- Mixed-layer CIN
- -339 J/kg
- Mixed-layer LCL
- 1510 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 107 m²/s²
- 0-3 km storm-relative helicity
- 177 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
666 WGUS55 KSLC 152113 FFWSLC UTC055-160015- /O.NEW.KSLC.FF.W.0030.110815T2113Z-110816T0015Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE SALT LAKE CITY UT 313 PM MDT MON AUG 15 2011 THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A * FLASH FLOOD WARNING FOR... PORTIONS OF CAPITOL REEF NATIONAL PARK IN SOUTH CENTRAL WAYNE COUNTY IN UTAH * UNTIL 615 PM MDT * AT 309 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THUNDERSTORMS CAPABLE OF PRODUCING VERY HEAVY RAIN OVER THE WARNED AREA. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO CAPITOL REEF NATIONAL PARK. THIS INCLUDES GRAND WASH AND CAPITOL GORGE...AS WELL AS OTHER SLOT CANYONS AND FLASH FLOOD PRONE DRAINAGES ALONG THE SCENIC DRIVE SOUTH OF THE VISITORS CENTER. PRECAUTIONARY/PREPAREDNESS ACTIONS... DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. && LAT...LON 3828 11134 3827 11109 3816 11112 3818 11128 $$ SCHOENING
2 follow-up statements
521 WGUS75 KSLC 152244 FFSSLC FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SALT LAKE CITY UT 444 PM MDT MON AUG 15 2011 UTC055-160015- /O.CON.KSLC.FF.W.0030.000000T0000Z-110816T0015Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ WAYNE UT- 444 PM MDT MON AUG 15 2011 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 615 PM MDT FOR CAPITOL REEF NATIONAL PARK IN SOUTH CENTRAL WAYNE COUNTY... AT 436 PM MDT...THE STRONG THUNDERSTORM THAT PASSED THROUGH CAPITOL REEF NATIONAL PARK A LITTLE OVER ONE HOUR AGO HAS PRODUCED FLASH FLOODING WITHIN PARK. PARK OFFICIALS HAVE CONFIRMED FLASH FLOODING IN THE GRAND WASH AND WATER WAS CROSSING HIGHWAY 24 AS OF 420 PM MDT. ADDITIONALLY...FLOODING IS OCCURRING ON THE FREMONT RIVER WITHIN THE PARK BOUNDARIES. RAINFALL HAS ENDED AND THE FLASH FLOODING IS EXPECTED TO RECEDE OVER THE NEXT FEW HOURS. ADDITIONAL SHOWERS AND THUNDERSTORMS ARE POSSIBLE OVER THE WARNED AREA OVER THE NEXT FEW HOURS...BUT SHOULD PASS JUST SOUTH OF THE AREA OF CONCERN. LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO CAPITOL REEF NATIONAL PARK PRECAUTIONARY/PREPAREDNESS ACTIONS... DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING. IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY. RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY AUTOMOBILE. && LAT...LON 3828 11134 3827 11109 3816 11112 3818 11128 $$ MERRILL
061 WGUS75 KSLC 160021 FFSSLC FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SALT LAKE CITY UT 621 PM MDT MON AUG 15 2011 UTC055-160031- /O.EXP.KSLC.FF.W.0030.000000T0000Z-110816T0015Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ WAYNE UT- 621 PM MDT MON AUG 15 2011 ...THE FLASH FLOOD WARNING HAS EXPIRED FOR SOUTH CENTRAL WAYNE COUNTY... RUNOFF FROM EARLIER PRECIPITATION HAS DIMINISHED GREATLY AND RIVER AND STREAM LEVELS HAVE DECREASED. REPORTS INDICATE THAT FLOODING HAS ENDED WITHIN CAPITOL REEF NATIONAL PARK. THEREFORE... THE FLASH FLOOD WARNING HAS BEEN ALLOWED TO EXPIRE. MONITOR NOAA WEATHER RADIO OR LOCAL TELEVISION OR RADIO FOR THE LATEST WEATHER INFORMATION. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. LAT...LON 3828 11134 3827 11109 3816 11112 3818 11128 $$ MERRILL
The office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 14, 10:11 PM MDT | Special Weather Statement | SLC | Davis | 34 min |
| Aug 14, 10:51 PM MDT | Special Weather Statement | SLC | Cache, Juab, Morgan, Salt Lake, Weber | 39 min |
| Aug 14, 11:38 PM MDT | Special Weather Statement | SLC | Davis, Morgan, Rich, Salt Lake, Utah, Weber | 52 min |
| Aug 15, 3:19 PM MDT | Severe Thunderstorm Warning | SLC | Garfield, Wayne | 41 min |
| Aug 15, 4:00 PM MDT | Severe Thunderstorm Warning | SLC | Wayne | 45 min |
| Aug 15, 4:29 PM MDT | Severe Thunderstorm Warning | SLC | Emery | 46 min |
| Aug 15, 4:35 PM MDT | Severe Thunderstorm Warning | SLC | Morgan, Rich, Summit | 40 min |
| Aug 15, 4:46 PM MDT | Severe Thunderstorm Warning | SLC | Wayne | 26 min |
| Aug 15, 5:13 PM MDT | Severe Thunderstorm Warning | SLC | Carbon, Emery | 47 min |
| Aug 15, 5:54 PM MDT | Special Weather Statement | SLC | Carbon | 36 min |
Nearby
Flash Flood Warnings in Utah, 2011Every flash flood warning in 2011
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.