Alert archive / Arizona / Flash Flood Warnings in 2012
Flash Flood Warning 38, NWS Phoenix, AZ
NWS Phoenix, AZ issued this flash flood warning at Aug 18, 2012, 3:02 PM MST for Maricopa County, Arizona. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 18, 2012, 3:02 PM MST (22:02 UTC)
- Expired
- Aug 18, 2012, 6:00 PM MST
- In force
- 3 hr
- Issued by
- NWS Phoenix, AZ
- Area
- Storm-based polygon
- Flood severity
- None
County Maricopa County, AZ
The radar
The Phoenix radar (KIWA), 71 km from the middle of the area, began a volume at 22:04 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.
The nearest sounding before it
Phoenix, AZ (KPSR), launched 12:00Z, 10.0 hours before the alert went out and 69 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
- 941 J/kg
- Mixed-layer CIN
- -63 J/kg
- Mixed-layer LCL
- 1133 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 54 m²/s²
- 0-3 km storm-relative helicity
- 59 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
752 WGUS55 KPSR 182202 FFWPSR AZC013-190000- /O.NEW.KPSR.FF.W.0038.120818T2202Z-120819T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE PHOENIX AZ 302 PM MST SAT AUG 18 2012 THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A * FLASH FLOOD WARNING FOR... EXTREME NORTHEASTERN MARICOPA COUNTY IN SOUTH CENTRAL ARIZONA... THIS INCLUDES SYCAMORE CREEK...SUNFLOWER... * UNTIL 500 PM MST * AT 255 PM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED HEAVY RAIN OVER THE SUNFLOWER BURN AREA. STORMS IN THE AREA HAVE ALREADY PRODUCED OVER ONE HALF INCH OF RAINFALL ACROSS THE NORTHERN PORTIONS OF THE BURN AREA. THE RAIN WILL PRODUCE HIGH WATER IN CREEKS AND WASHES ACCOMPANIED BY MUD...ROCKS...AND DEBRIS. * FLASH FLOODING OF THE SYCAMORE CREEK DRAINAGE IS IMMINENT AND WILL IMPACT THE COMMUNITY OF SUNFLOWER...AS WELL AS LOW WATER CROSSINGS OF FOREST ROADS AND TRAILS. THIS INCLUDES FOREST ROAD 22 SOUTH OF HIGHWAY 87...THE ARIZONA TRAIL...AND BOULDER CREEK. PRECAUTIONARY/PREPAREDNESS ACTIONS... IF YOU ARE NEAR THE BANKS OF SYCAMORE CREEK OR OTHER NEARBY DRAINAGE AREAS MOVE IMMEDIATELY TO HIGHER GROUND. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS THE ROAD. TURN AROUND DONT DROWN. LIFE-THREATENING FLOODING OF CREEKS...ROADS AND NORMALLY DRY WASHES IS LIKELY. THE HEAVY RAINS WILL TRIGGER MUD AND DEBRIS FLOWS...AND ROCKSLIDES IN STEEP TERRAIN...ESPECIALLY NEAR THE BURN AREA. TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY YOUR REPORT. && LAT...LON 3398 11153 3399 11145 3382 11145 3381 11153 $$ NOLTE
4 follow-up statements
855 WGUS75 KPSR 182226 FFSPSR FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE PHOENIX AZ 326 PM MST SAT AUG 18 2012 AZC013-190000- /O.CON.KPSR.FF.W.0038.000000T0000Z-120819T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ MARICOPA AZ- 326 PM MST SAT AUG 18 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 500 PM MST FOR EXTREME NORTHEASTERN MARICOPA COUNTY... AT 313 PM MST...WEATHER RADAR DETECTED SEVERAL LARGE THUNDERSTORMS WITH HEAVY RAIN REDEVELOPING IN THE SUNFLOWER BURN AREA...IN OTHER TRIBUTARIES FEEDING INTO THE SYCAMORE WASH. THIS IS A DANGEROUS SITUATION IN WHICH FLASH FLOODING IS LIKELY. IT MAY TAKE ABOUT ONE HOUR TO ONE AND ONE HALF HOURS FOR FLASH FLOODING TO MOVE PAST THE SMALL RANCHES ALONG THE SYCAMORE WASH...DOWN STREAM FROM THE SUNFLOWER BURN AREA. LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SYCAMORE CREEK PRECAUTIONARY/PREPAREDNESS ACTIONS... IF YOU ARE NEAR THE BANKS OF SYCAMORE CREEK OR OTHER NEARBY DRAINAGE AREAS MOVE IMMEDIATELY TO HIGHER GROUND. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS THE ROAD. TURN AROUND DONT DROWN. LIFE-THREATENING FLOODING OF CREEKS...ROADS AND NORMALLY DRY WASHES IS LIKELY. THE HEAVY RAINS WILL TRIGGER MUD AND DEBRIS FLOWS...AND ROCKSLIDES IN STEEP TERRAIN...ESPECIALLY NEAR THE BURN AREA. TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY YOUR REPORT. A FLASH FLOOD WARNING MEANS THAT PEOPLE ALONG THE BANKS OF WASHES AND CREEKS SHOULD MOVE TO HIGHER GROUND IMMEDIATELY. NORMALLY DRY WASHES AND STREAMS WILL SUDDENLY HAVE RUNNING WATER AND MAKE UNBRIDGED CROSSINGS IMPASSABLE. STREETS...UNDERPASSES...AND LOW SPOTS WILL BECOME INUNDATED MAKING DRIVING HAZARDOUS IN THE WARNED AREA. && LAT...LON 3398 11153 3399 11145 3382 11145 3381 11153 $$ HV
217 WGUS75 KPSR 182301 FFSPSR FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE PHOENIX AZ 401 PM MST SAT AUG 18 2012 AZC013-190000- /O.CON.KPSR.FF.W.0038.000000T0000Z-120819T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ MARICOPA AZ- 401 PM MST SAT AUG 18 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 500 PM MST FOR EXTREME NORTHEASTERN MARICOPA COUNTY... AT 346 PM MST...THUNDERSTORMS WITH HEAVY RAIN HAVE WEAKENED AND MOVED WEST OF THE SUNFLOWER BURN AREA. HOWEVER...VERY HEAVY RAIN HAS FALLEN OVER THE BURN AREA AND ITS TRIBUTARIES FEEDING INTO THE MAINSTREAM SYCAMORE CREEK. ONE RIVER GAGE ALONG THE SYCAMORE WASH JUST OUTSIDE THE BURN AREA RECORDED A WALL OF WATER AND FLOODING 4 TO 5 FEET DEEP...FLOWING DOWNSTREAM TOWARD THE SMALL RANCHES ALONG SYCAMORE CREEK...AND TOWARD THE TOWN OF SUNFLOWER. ALTHOUGH RAINFALL HAD DIMINISHED AT 346 PM...IT WILL TAKE SEVERAL HOURS FOR WATER TO WORK ITS WAY DOWNSTREAM IN THE SYCAMORE WASH MAKING FLASH FLOODING LIKELY THROUGH 5 PM. LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SYCAMORE CREEK. PRECAUTIONARY/PREPAREDNESS ACTIONS... IF YOU ARE NEAR THE BANKS OF SYCAMORE CREEK OR OTHER NEARBY DRAINAGE AREAS MOVE IMMEDIATELY TO HIGHER GROUND. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS THE ROAD. TURN AROUND DONT DROWN. LIFE-THREATENING FLOODING OF CREEKS...ROADS AND NORMALLY DRY WASHES IS LIKELY. THE HEAVY RAINS WILL TRIGGER MUD AND DEBRIS FLOWS...AND ROCKSLIDES IN STEEP TERRAIN...ESPECIALLY NEAR THE BURN AREA. TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY YOUR REPORT. A FLASH FLOOD WARNING MEANS THAT PEOPLE ALONG THE BANKS OF WASHES AND CREEKS SHOULD MOVE TO HIGHER GROUND IMMEDIATELY. NORMALLY DRY WASHES AND STREAMS WILL SUDDENLY HAVE RUNNING WATER AND MAKE UNBRIDGED CROSSINGS IMPASSABLE. STREETS...UNDERPASSES...AND LOW SPOTS WILL BECOME INUNDATED MAKING DRIVING HAZARDOUS IN THE WARNED AREA. && LAT...LON 3398 11153 3399 11145 3382 11145 3381 11153 $$ HV
248 WGUS55 KPSR 190000 FFWPSR AZC013-190100- /O.EXT.KPSR.FF.W.0038.000000T0000Z-120819T0100Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE PHOENIX AZ 500 PM MST SAT AUG 18 2012 THE NATIONAL WEATHER SERVICE IN PHOENIX HAS EXTENDED THE * FLASH FLOOD WARNING FOR... EXTREME NORTHEASTERN MARICOPA COUNTY IN SOUTH CENTRAL ARIZONA... THIS INCLUDES SYCAMORE CREEK DOWNSTREAM TO THE TOWN OF SUNFLOWER... * UNTIL 600 PM MST * AT 447 PM MST...ALTHOUGH HEAVY THUNDERSTORM RAINS HAVE ENDED OVER THE SUNFLOWER BURN AREA...A MEASURED FLOW OF 4 TO 5 FEET OF WATER HAS YET TO REGISTER ON SYCAMORE CREEK RIVER GAGE AT HIGHWAY 87. THEREFORE FLOOD OR FLASH FLOODING IS STILL WORKING ITS WAY DOWNSTREAM IN SYCAMORE CREEK TOWARD THE TOWN OF SUNFLOWER. THE FLASH FLOOD WARNING FOR SYCAMORE CREEK WILL BE EXTENDED UNTIL 6 PM. PRECAUTIONARY/PREPAREDNESS ACTIONS... IF YOU ARE NEAR THE BANKS OF SYCAMORE CREEK OR OTHER NEARBY DRAINAGE AREAS MOVE IMMEDIATELY TO HIGHER GROUND. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS THE ROAD. TURN AROUND DONT DROWN. TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY YOUR REPORT. A FLASH FLOOD WARNING MEANS THAT PEOPLE ALONG THE BANKS OF WASHES AND CREEKS SHOULD MOVE TO HIGHER GROUND IMMEDIATELY. NORMALLY DRY WASHES AND STREAMS WILL SUDDENLY HAVE RUNNING WATER AND MAKE UNBRIDGED CROSSINGS IMPASSABLE. STREETS...UNDERPASSES...AND LOW SPOTS WILL BECOME INUNDATED MAKING DRIVING HAZARDOUS IN THE WARNED AREA. TO REPORT FLOODING...PLEASE RELAY YOUR REPORT TO LOCAL LAW ENFORCEMENT WHEN YOU CAN DO SO SAFELY. && LAT...LON 3398 11153 3399 11145 3382 11145 3381 11153 $$ HV
786 WGUS75 KPSR 190102 FFSPSR FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE PHOENIX AZ 602 PM MST SAT AUG 18 2012 AZC013-190107- /O.EXP.KPSR.FF.W.0038.000000T0000Z-120819T0100Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ MARICOPA AZ- 602 PM MST SAT AUG 18 2012 ...THE FLASH FLOOD WARNING WILL EXPIRE AT 600 PM MST FOR EXTREME NORTHEASTERN MARICOPA COUNTY... THE FLASH FLOOD WARNING ISSUED EARLIER FOR THE CREEKS AND WASHES IN THE SUNFLOWER BURN AREA...AND THE MAINSTREAM SYCAMORE CREEK WAS ALLOWED TO EXPIRE AT 6 PM. A RIVER GAGE ON SYCAMORE CREEK MEASURED RUNOFF 4 TO 5 FEET DEEP WHICH WORKED ITS WAY DOWNSTREAM TOWARD THE TOWN OF SUNFLOWER. THERE HAS BEEN NO FEEDBACK OR INFORMATION FROM RANCHERS OR OTHER PEOPLE IN IN THE AREA AS TO THE IMPACT OF FLOODING ALONG SYCAMORE CREEK...SO THE FLASH FLOOD WARNING WAS ALLOWED TO EXPIRE. LAT...LON 3398 11153 3399 11145 3382 11145 3381 11153 $$ HV
Nearby
Flash Flood Warnings in Arizona, 2012Every flash flood warning in 2012
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.