Alert archive / Arizona / Flash Flood Warnings in 2018
Flash Flood Warning 49, NWS Phoenix, AZ
NWS Phoenix, AZ issued this flash flood warning at Aug 10, 2018, 11:31 PM MST for Maricopa County, Arizona. It was in force for 119 min. 4 reports 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 10, 2018, 11:31 PM MST (06:31 UTC)
- Expired
- Aug 11, 2018, 1:30 AM MST
- In force
- 119 min
- Issued by
- NWS Phoenix, AZ
- Area
- Storm-based polygon
- Flood severity
- None
County Maricopa County, AZ
The radar
The Phoenix radar (KIWA), 40 km from the middle of the area, began a volume at 06:31 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 10, 11:32 PM MST | HEAVY RAIN 0.82 | 3 Nne Phoenix, AZ | CORRECTS PREVIOUS HEAVY RAIN REPORT FROM 3 NNE PHOENIX. |
| Aug 10, 11:32 PM MST | HEAVY RAIN 0.82 | 3 Nne Phoenix, AZ | |
| Aug 10, 11:46 PM MST | HEAVY RAIN 0.67 | 1 Nnw Phoenix, AZ | |
| Aug 11, 12:00 AM MST | FLASH FLOOD | 6 W Paradise Valley, AZ | PUBLIC PHOENIX RESIDENT REPORTED ROARING WATERS FLOWING DOWN A WASH BEHIND THEIR HOUSE. THIS WAS IS BEHIND EAST MYRTLE AVENUE AND RUNS UNDER THE 51. |
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, 6.5 hours before the alert went out and 11 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
- 276 J/kg
- Mixed-layer CIN
- -239 J/kg
- Mixed-layer LCL
- 2297 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 8 m²/s²
- 0-3 km storm-relative helicity
- 68 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
397
WGUS55 KPSR 110631
FFWPSR
AZC013-110830-
/O.NEW.KPSR.FF.W.0049.180811T0631Z-180811T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Phoenix AZ
1131 PM MST FRI AUG 10 2018
The National Weather Service in Phoenix has issued a
* Flash Flood Warning for...
Maricopa County in south central Arizona...
* Until 130 AM MST.
* At 1130 PM MST, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Flash flooding is expected to
begin shortly.
* Some locations that will experience flooding include...
Phoenix, Mesa, Tempe, Paradise Valley, Laveen, Mesa Riverview Mall,
Tempe Marketplace, Papago Park, Piestewa Peak Park, Arizona Mills
Mall, North Mountain Park, South Phoenix, Arizona State
Fairgrounds, Downtown Phoenix and Metro Center.
* This includes the following highways...
AZ Interstate 10 between mile markers 141 and 157.
AZ Interstate 17 between mile markers 195 and 213.
AZ Route 51 between mile markers 1 and 15.
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 3370 11196 3350 11196 3345 11177 3336 11195
3336 11215 3363 11215
$$
AD2 follow-up statements
357
WGUS75 KPSR 110642
FFSPSR
Flash Flood Statement
National Weather Service Phoenix AZ
1142 PM MST FRI AUG 10 2018
AZC013-110830-
/O.CON.KPSR.FF.W.0049.000000T0000Z-180811T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Maricopa AZ-
1142 PM MST FRI AUG 10 2018
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 130 AM MST FOR
MARICOPA COUNTY...
At 1142 PM MST, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Up to one inch of rain has already
fallen in some locations. Flash flooding is expected to begin
shortly.
Some locations that will experience flooding include...
Phoenix, Mesa, Tempe, Paradise Valley, Laveen, Mesa Riverview Mall,
Tempe Marketplace, Papago Park, Piestewa Peak Park, Arizona Mills
Mall, North Mountain Park, South Phoenix, Arizona State Fairgrounds,
Downtown Phoenix and Metro Center.
This includes the following highways...
AZ Interstate 10 between mile markers 141 and 157.
AZ Interstate 17 between mile markers 195 and 213.
AZ Route 51 between mile markers 1 and 15.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 3370 11196 3350 11196 3345 11177 3336 11195
3336 11215 3363 11215
$$
AD484
WGUS75 KPSR 110830
FFSPSR
Flash Flood Statement
National Weather Service Phoenix AZ
130 AM MST SAT AUG 11 2018
AZC013-110837-
/O.EXP.KPSR.FF.W.0049.000000T0000Z-180811T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Maricopa AZ-
130 AM MST SAT AUG 11 2018
...THE FLASH FLOOD WARNING FOR MARICOPA COUNTY WILL EXPIRE AT 130 AM
MST...
An Areal Flood Warning remains in effect for portions of south
Scottsdale including the Indian Bend Wash. Other locations within the
warned area will see water receding. Additional rainfall is possible
through 5 AM with a Flash Flood Watch in effect through 5 AM. Please
continue to heed any remaining road closures.
LAT...LON 3370 11196 3350 11196 3345 11177 3336 11195
3336 11215 3363 11215
$$
CKThe office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 8:13 PM MST | Special Weather Statement | PSR | Gila | 47 min |
| Aug 10, 8:25 PM MST | Severe Thunderstorm Warning | PSR | Gila, Maricopa, Pinal | 35 min |
| Aug 10, 9:00 PM MST | Special Weather Statement | PSR | Gila | 45 min |
| Aug 10, 9:11 PM MST | Dust Storm Advisory | PSR | Maricopa, Pinal | 94 min |
| Aug 10, 9:14 PM MST | Special Weather Statement | PSR | Pinal | 46 min |
| Aug 10, 9:40 PM MST | Severe Thunderstorm Warning | PSR | Gila, Maricopa | 35 min |
| Aug 10, 9:59 PM MST | Areal Flood Advisory | PSR | Gila, Maricopa | 3 hr |
| Aug 10, 10:01 PM MST | Special Weather Statement | PSR | 44 min | |
| Aug 10, 10:08 PM MST | Severe Thunderstorm Warning | PSR | Gila, Maricopa | 37 min |
| Aug 10, 10:15 PM MST | Areal Flood Advisory | PSR | Maricopa, Pinal | 3 hr |
| Aug 10, 10:26 PM MST | Special Weather Statement | PSR | Maricopa | 49 min |
| Aug 10, 10:35 PM MST | Flash Flood Warning | PSR | Gila, Maricopa, Pinal | 3 hr |
| Aug 10, 10:37 PM MST | Dust Storm Warning | PSR | Maricopa | 14 min |
| Aug 10, 10:39 PM MST | Severe Thunderstorm Warning | PSR | Gila, Maricopa | 51 min |
| Aug 10, 10:46 PM MST | Special Weather Statement | PSR | Maricopa | 44 min |
| Aug 10, 10:53 PM MST | Areal Flood Advisory | PSR | Maricopa | 112 min |
| Aug 10, 11:02 PM MST | Severe Thunderstorm Warning | PSR | Maricopa, Pinal | 43 min |
| Aug 10, 11:26 PM MST | Special Weather Statement | PSR | Maricopa | 49 min |
| Aug 10, 11:30 PM MST | Special Weather Statement | PSR | 30 min | |
| Aug 10, 11:35 PM MST | Areal Flood Advisory | PSR | Maricopa, Pinal | 3 hr |
| Aug 10, 11:38 PM MST | Dust Storm Advisory | PSR | Maricopa, Pinal | 52 min |
| Aug 11, 12:12 AM MST | Special Weather Statement | PSR | Maricopa | 48 min |
| Aug 11, 12:20 AM MST | Dust Storm Advisory | PSR | La Paz, Maricopa, Yuma | 40 min |
| Aug 11, 12:49 AM MST | Areal Flood Warning | PSR | Maricopa | 6 hr |
| Aug 11, 12:54 AM MST | Flash Flood Watch | PSR | Gila, Maricopa, Pinal | 4 hr |
| Aug 11, 12:58 AM MST | Special Weather Statement | PSR | Maricopa | 47 min |
| Aug 11, 1:49 AM MST | Special Weather Statement | PSR | 41 min | |
| Aug 11, 1:54 AM MST | Special Weather Statement | PSR | Maricopa | 51 min |
| Aug 11, 2:22 AM MST | Flash Flood Warning | PSR | Maricopa | 3 hr |
| Aug 11, 5:37 AM MST | Special Weather Statement | PSR | La Paz | 38 min |
| Aug 11, 6:18 AM MST | Special Weather Statement | PSR | La Paz | 42 min |
| Aug 11, 6:41 AM MST | Areal Flood Advisory | PSR | La Paz, Yuma | 3 hr |
| Aug 11, 6:56 AM MST | Special Weather Statement | PSR | 49 min | |
| Aug 11, 8:15 AM MST | Special Weather Statement | PSR | La Paz | 45 min |
| Aug 11, 9:14 AM MST | Special Weather Statement | PSR | La Paz | 31 min |
| Aug 11, 9:52 AM MST | Areal Flood Warning | PSR | La Paz, Yuma | 38 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.