Alert archive / Arizona / Flash Flood Warnings in 2011
Flash Flood Warning 3, NWS Phoenix, AZ
NWS Phoenix, AZ issued this flash flood warning at Aug 27, 2011, 9:38 PM MST for Maricopa County, Yuma 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 27, 2011, 9:38 PM MST (04:38 UTC)
- Expired
- Aug 28, 2011, 12:30 AM MST
- In force
- 3 hr
- Issued by
- NWS Phoenix, AZ
- Area
- Storm-based polygon
- Flood severity
- None
Counties Maricopa County, AZ, Yuma County, AZ
The radar
The Yuma radar (KYUX), 104 km from the middle of the area, began a volume at 04:37 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 00:00Z, 4.6 hours before the alert went out and 167 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
- 527 J/kg
- Mixed-layer CIN
- -108 J/kg
- Mixed-layer LCL
- 3311 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- -11 m²/s²
- 0-3 km storm-relative helicity
- 32 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
378
WGUS55 KPSR 280438
FFWPSR
AZC013-027-280730-
/O.NEW.KPSR.FF.W.0003.110828T0438Z-110828T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
938 PM MST SAT AUG 27 2011
THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A
* FLASH FLOOD WARNING FOR...
EXTREME SOUTHWESTERN MARICOPA COUNTY IN SOUTH CENTRAL ARIZONA...
EAST CENTRAL YUMA COUNTY IN SOUTHWEST ARIZONA...
* UNTIL 1230 AM MST
* AT 929 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED
THUNDERSTORMS PRODUCING HEAVY RAINFALL ACROSS PORTIONS OF SOUTHWEST
MARICOPA AND EASTERN YUMA COUNTIES...MAINLY BETWEEN THE COMMUNITIES
OF HYDER...SENTINEL...DATELAND...ROLL AND TACNA.
* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO TYSON...
PALOMA...AND ALONG POTIONS OF INTERSTATE 8 IN THE AREA.
THE COMPLEX OF THUNDERSTORMS PRODUCING HEAVY RAIN IS SLOWLY MOVING
WEST...AND RAINFALL RATES OF UP TO 3 INCHES PER HOUR ARE OCCURRING
OVER THIS AREA.
MANY DRY WASHES WILL BEGIN TO SEE A FLOW OF WATER...AND RUN OFF MAY
SUDDENLY COVER LOW WATER CROSSING AND BEGIN TO POOL IN LOW LYING
AREAS. SOME OF THE WASHING THAT MAY BE IMPACTED INCLUDE THE TEN MILE
WASH...THE COPPER WASH AND THE COLUMBUS WASH...AND MANY OTHER
SMALLER DRAINAGES THAT FEED INTO THE GILA RIVER.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
RUNOFF FROM HEAVY RAINFALL WILL CAUSE NORMALLY DRY WASHES TO RUN AND
CAUSE CONSIDERABLE PONDING OF WATER ON ROADS AND LOW LYING SPOTS.
UNBRIDGED CROSSINGS MAY BECOME TOO DANGEROUS FOR DRIVING.
NEVER DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. WHEN ENCOUNTERING FLOODED ROADS MAKE THE SMART
CHOICE...TURN AROUND...DONT DROWN.
&&
LAT...LON 3281 11399 3291 11370 3300 11351 3308 11312
3276 11311 3263 11397
$$
MEYERS1 follow-up statement
964
WGUS75 KPSR 280646
FFSPSR
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
1146 PM MST SAT AUG 27 2011
AZC013-027-280730-
/O.CON.KPSR.FF.W.0003.000000T0000Z-110828T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
YUMA AZ-MARICOPA AZ-
1146 PM MST SAT AUG 27 2011
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1230 AM MST FOR
EXTREME SOUTHWESTERN MARICOPA AND CENTRAL YUMA COUNTIES...
AT 1129 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED
ONLY LIGHT RAIN SHOWERS OVER THE WARNED AREA. THE THREAT FOR
ADDITIONAL HEAVY RAIN HAS ENDED IN THE WARNED AREA.
BETWEEN 8 PM AND 1030 PM...NATIONAL WEATHER SERVICE RADAR INDICATED
THAT BETWEEN 1.5 AND 3 INCHES OF RAIN FELL ALONG AND NEAR INTERSTATE
8 IN A 15 MILE WIDE ZONE EXTENDING FROM 10 MILES WEST OF GILA BEND
TO NEAR TACNA. HEAVIEST RAINFALL...POSSIBLY IN EXCESS OF 3
INCHES...FELL ALONG A NARROW BAND EXTENDING FROM 5 MILES SOUTH OF
SENTINEL TO 5 MILES SOUTHEAST OF DATELAND. SOME OF THE AREA AFFECTED
BY HEAVY RAINFALL PROBABLY RECEIVED MORE THAN HALF OF THEIR AVERAGE
YEARLY RAINFALL WITH THIS STORM. WASHES OVER FAR SOUTHWEST
MARICOPA COUNTY AND EAST-CENTRAL YUMA COUNTY ARE RUNNING...AND MANY
LOW WATER CROSSINGS WILL BE FLOODED. MANY OF THE AFFECTED WASHES
DRAIN INTO THE GILA RIVER.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. DO NOT ATTEMPT TO CROSS SWIFTLY FLOWING WATERS
OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY AUTOMOBILE.
&&
LAT...LON 3281 11399 3291 11370 3300 11351 3308 11312
3276 11311 3263 11397
$$
DGThe office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 27, 5:01 PM MST | Severe Thunderstorm Warning | PSR | Gila, Maricopa, Pinal | 59 min |
| Aug 27, 5:36 PM MST | Special Weather Statement | PSR | La Paz | 39 min |
| Aug 27, 6:11 PM MST | Special Weather Statement | PSR | 79 min | |
| Aug 27, 6:14 PM MST | Severe Thunderstorm Warning | PSR | Pinal | 46 min |
| Aug 27, 6:23 PM MST | Dust Storm Warning | PSR | 97 min | |
| Aug 27, 6:58 PM MST | Severe Thunderstorm Warning | PSR | Maricopa | 25 min |
| Aug 27, 7:59 PM MST | Special Weather Statement | PSR | 76 min | |
| Aug 27, 8:38 PM MST | Severe Thunderstorm Warning | PSR | Maricopa, Yuma | 52 min |
| Aug 27, 9:18 PM MST | Areal Flood Advisory | PSR | Maricopa, Yuma | 3 hr |
| Aug 27, 9:25 PM MST | Severe Thunderstorm Warning | PSR | Yuma | 65 min |
| Aug 27, 9:46 PM MST | Dust Storm Warning | PSR | 2 hr | |
| Aug 27, 10:02 PM MST | Severe Thunderstorm Warning | PSR | Yuma | 58 min |
| Aug 28, 12:26 AM MST | Special Weather Statement | PSR | La Paz | 79 min |
| Aug 28, 3:39 AM MST | Excessive Heat Warning | PSR | 40 hr |
Nearby
Flash Flood Warnings in Arizona, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.