Alert archive / Arizona / Flash Flood Warnings in 2018
Flash Flood Warning 101, NWS Phoenix, AZ
NWS Phoenix, AZ issued this flash flood warning at Oct 7, 2018, 3:49 AM MST for Maricopa County, Arizona. 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
- Oct 7, 2018, 3:49 AM MST (10:49 UTC)
- Expired
- Oct 7, 2018, 6:45 AM 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), 49 km from the middle of the area, began a volume at 10:51 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 |
|---|---|---|---|
| Oct 7, 6:10 AM MST | FLASH FLOOD | 6 N Deer Valley, AZ | **DELAYED REPORT** NORTHERN VALLEY PARKWAY LOW WATER CROSSING CLOSED DUE TO FLASH FLOODING. DATA FROM MARICOPA COUNTY FLOOD CONTROL STREAM GAGE LOCATED ALONG SONORAN WASH LOCATED UPSTREAM OF THE IMPACTED ROADWAY. TIMING BASED ON STREAM GAGE RECORD. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Phoenix, AZ (KPSR), launched 00:00Z, 10.8 hours before the alert went out and 28 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2153 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 19 m²/s²
- 0-3 km storm-relative helicity
- 141 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
268
WGUS55 KPSR 071049
FFWPSR
AZC013-071345-
/O.NEW.KPSR.FF.W.0101.181007T1049Z-181007T1345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Phoenix AZ
349 AM MST SUN OCT 7 2018
The National Weather Service in Phoenix has issued a
* Flash Flood Warning for...
Maricopa County in south central Arizona...
* Until 645 AM MST.
* At 349 AM MST, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Up to one inch of rain has
already fallen. Flash flooding is expected to begin shortly.
* Some locations that will experience flooding include...
Phoenix, Glendale, Scottsdale, Tempe, Paradise Valley, New River,
Cave Creek, Carefree, Papago Park, Piestewa Peak Park, Deer Valley
Airport, North Mountain Park, Downtown Scottsdale, Metro Center and
Desert Mountain.
* This includes the following highways...
AZ Interstate 17 between mile markers 203 and 222.
AZ Route 51 between mile markers 1 and 15.
US Highway 60 between mile markers 155 and 157.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 3390 11176 3364 11183 3344 11191 3344 11195
3352 11219 3391 11210
$$
CK1 follow-up statement
585
WGUS75 KPSR 071146
FFSPSR
Flash Flood Statement
National Weather Service Phoenix AZ
446 AM MST SUN OCT 7 2018
AZC013-071345-
/O.CON.KPSR.FF.W.0101.000000T0000Z-181007T1345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Maricopa AZ-
446 AM MST SUN OCT 7 2018
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 645 AM MST FOR
MARICOPA COUNTY...
At 445 AM MST, Doppler radar and automated rain gauges indicated
thunderstorms produced heavy rain over the warned area with moderate
rain still ongoing. Over one inch of rain has already fallen. Flash
flooding is expected to begin shortly.
Some locations that will experience flooding include...
Phoenix, Glendale, Scottsdale, Tempe, Paradise Valley, New River,
Cave Creek, Carefree, Papago Park, Piestewa Peak Park, Deer Valley
Airport, North Mountain Park, Downtown Scottsdale, Metro Center and
Desert Mountain.
This includes the following highways...
AZ Interstate 17 between mile markers 203 and 222.
AZ Route 51 between mile markers 1 and 15.
US Highway 60 between mile markers 155 and 157.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, urban areas, highways, streets and underpasses as
well as other drainage areas and low lying spots.
&&
LAT...LON 3390 11176 3364 11183 3344 11191 3344 11195
3352 11219 3391 11210
$$
CKThe office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 6, 10:34 PM MST | Special Weather Statement | PSR | 26 min | |
| Oct 6, 10:38 PM MST | Areal Flood Advisory | PSR | La Paz | 3 hr |
| Oct 6, 10:52 PM MST | Special Weather Statement | PSR | 38 min | |
| Oct 6, 11:50 PM MST | Special Weather Statement | PSR | 25 min | |
| Oct 7, 12:08 AM MST | Special Weather Statement | PSR | 22 min | |
| Oct 7, 12:31 AM MST | Areal Flood Advisory | PSR | Maricopa | 3 hr |
| Oct 7, 12:36 AM MST | Areal Flood Advisory | PSR | La Paz | 3 hr |
| Oct 7, 1:13 AM MST | Areal Flood Advisory | PSR | Maricopa | 3 hr |
| Oct 7, 1:29 AM MST | Special Weather Statement | PSR | Maricopa | 31 min |
| Oct 7, 1:49 AM MST | Areal Flood Advisory | PSR | Maricopa | 3 hr |
| Oct 7, 2:08 AM MST | Special Weather Statement | PSR | Maricopa | 37 min |
| Oct 7, 2:11 AM MST | Special Weather Statement | PSR | Maricopa | 34 min |
| Oct 7, 2:29 AM MST | Areal Flood Advisory | PSR | Maricopa | 3 hr |
| Oct 7, 2:37 AM MST | Special Weather Statement | PSR | 38 min | |
| Oct 7, 2:42 AM MST | Special Weather Statement | PSR | Maricopa | 33 min |
| Oct 7, 2:47 AM MST | Flash Flood Warning | PSR | Maricopa | 3 hr |
| Oct 7, 2:50 AM MST | Areal Flood Advisory | PSR | Maricopa, Pinal | 3 hr |
| Oct 7, 3:09 AM MST | Special Weather Statement | PSR | 36 min | |
| Oct 7, 3:22 AM MST | Special Weather Statement | PSR | Maricopa | 23 min |
| Oct 7, 3:24 AM MST | Special Weather Statement | PSR | Maricopa | 36 min |
| Oct 7, 3:43 AM MST | Areal Flood Advisory | PSR | Maricopa | 3 hr |
| Oct 7, 4:13 AM MST | Flash Flood Warning | PSR | Maricopa | 3 hr |
| Oct 7, 4:26 AM MST | Flash Flood Warning | PSR | Maricopa | 4 hr |
| Oct 7, 5:56 AM MST | Areal Flood Advisory | PSR | Gila, Maricopa, Pinal | 3 hr |
| Oct 7, 6:40 AM MST | Flash Flood Warning | PSR | Maricopa | 3 hr |
| Oct 7, 6:47 AM MST | Areal Flood Warning | PSR | Maricopa | 6 hr |
| Oct 7, 7:04 AM MST | Areal Flood Warning | PSR | Maricopa | 3 hr |
| Oct 7, 7:11 AM MST | Areal Flood Advisory | PSR | Maricopa, Pinal | 2 hr |
| Oct 7, 7:28 AM MST | Areal Flood Advisory | PSR | Maricopa, Pinal | 2 hr |
| Oct 7, 7:59 AM MST | Areal Flood Warning | PSR | Maricopa, Pinal | 3 hr |
| Oct 7, 9:21 AM MST | Areal Flood Advisory | PSR | Gila | 3 hr |
| Oct 7, 9:43 AM MST | Special Weather Statement | PSR | Pinal | 32 min |
| Oct 7, 10:53 AM MST | Areal Flood Warning | PSR | Maricopa | 3 hr |
| Oct 7, 1:10 PM MST | Special Weather Statement | PSR | 35 min | |
| Oct 7, 2:03 PM MST | Special Weather Statement | PSR | 42 min | |
| Oct 7, 2:39 PM MST | Special Weather Statement | PSR | 51 min | |
| Oct 7, 2:47 PM MST | Special Weather Statement | PSR | 43 min | |
| Oct 7, 2:57 PM MST | Special Weather Statement | PSR | Maricopa | 48 min |
| Oct 7, 3:34 PM MST | Special Weather Statement | PSR | 41 min | |
| Oct 7, 4:00 PM MST | Special Weather Statement | PSR | Maricopa | 45 min |
| Oct 7, 4:32 PM MST | Special Weather Statement | PSR | Maricopa | 43 min |
| Oct 7, 4:33 PM MST | Special Weather Statement | PSR | 42 min | |
| Oct 7, 4:43 PM MST | Areal Flood Advisory | PSR | Maricopa | 2 hr |
| Oct 7, 4:55 PM MST | Special Weather Statement | PSR | Maricopa | 50 min |
Nearby
Flash Flood Warnings in Arizona, 2018Every flash flood warning in 2018
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.