Alert archive / Arizona / Flash Flood Warnings in 2011
Flash Flood Warning 52, NWS Tucson, AZ
NWS Tucson, AZ issued this flash flood warning at Aug 20, 2011, 2:59 PM MST for Santa Cruz County, Arizona. It was in force for 2 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 20, 2011, 2:59 PM MST (21:59 UTC)
- Expired
- Aug 20, 2011, 5:00 PM MST
- In force
- 2 hr
- Issued by
- NWS Tucson, AZ
- Area
- Storm-based polygon
- Flood severity
- None
County Santa Cruz County, AZ
The radar
The Tucson radar (KEMX), 67 km from the middle of the area, began a volume at 22:01 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 20, 3:15 PM MST | FLASH FLOOD | Nogales, AZ | USGS GAUGE AT NOGALES WASH SHOWED 5 FOOT SPIKE |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Tuscon, AZ (KTUS), launched 12:00Z, 10.0 hours before the alert went out and 91 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
- 233 J/kg
- Mixed-layer CIN
- -69 J/kg
- Mixed-layer LCL
- 1510 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- 9 m²/s²
- 0-3 km storm-relative helicity
- 11 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
672
WGUS55 KTWC 202159
FFWTWC
AZC023-210000-
/O.NEW.KTWC.FF.W.0052.110820T2159Z-110821T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
259 PM MST SAT AUG 20 2011
THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A
* FLASH FLOOD WARNING FOR...
SOUTH CENTRAL SANTA CRUZ COUNTY IN SOUTHEAST ARIZONA...
THIS INCLUDES THE CITY OF NOGALES...
* UNTIL 500 PM MST
* AT 247 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
FLASH FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA. ONE TO TWO
INCHES OF RAINFALL IN THE LAST HOUR HAS OCCURRED ACROSS NOGALES
SONORA WITH FLASH FLOODING EXPECTED DOWNSTREAM ALONG THE NOGALES
WASH INTO NOGALES ARIZONA.
* THE STORM PRODUCING FLASH FLOODING WILL OTHERWISE REMAIN OVER
MAINLY RURAL AREAS OF THE INDICATED COUNTY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF WASHES
AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES AS
WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.
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 3133 11102 3141 11100 3142 11088 3133 11084
3132 11101
$$
GL2 follow-up statements
396
WGUS75 KTWC 202259
FFSTWC
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
359 PM MST SAT AUG 20 2011
AZC023-210000-
/O.CON.KTWC.FF.W.0052.000000T0000Z-110821T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SANTA CRUZ AZ-
359 PM MST SAT AUG 20 2011
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 500 PM MST FOR SOUTH
CENTRAL SANTA CRUZ COUNTY...
AT 347 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED ONE
TO TWO INCHES OF RAINFALL HAD OCCURRED ACROSS NOGALES SONORA. THIS
HEAVY RAINFALL WILL LEAD TO CONTINUED FLASH FLOODING MAINLY IN THE
NOGALES WASH AS IT FLOWS FROM NOGALES SONORA INTO NOGALES SONORA.
LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO NOGALES
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.
&&
LAT...LON 3133 11102 3141 11100 3142 11088 3133 11084
3132 11101
$$
GL313
WGUS75 KTWC 202352
FFSTWC
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
452 PM MST SAT AUG 20 2011
AZC023-210002-
/O.EXP.KTWC.FF.W.0052.000000T0000Z-110821T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SANTA CRUZ AZ-
452 PM MST SAT AUG 20 2011
...THE FLASH FLOOD WARNING WILL EXPIRE AT 500 PM MST FOR SOUTH
CENTRAL SANTA CRUZ COUNTY...
FLOW IN THE NOGALES WASH AND OTHER WASHES IN THE NOGALES AREA WILL
CONTINUE TO SUBSIDE INTO THE EARLY EVENING HOURS...THUS THE FLASH
FLOOD WARNING WILL BE ALLOWED TO EXPIRE.
LAT...LON 3133 11102 3141 11100 3142 11088 3133 11084
3132 11101
$$The office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 19, 5:18 PM MST | Special Weather Statement | TWC | Santa Cruz | 27 min |
| Aug 19, 5:57 PM MST | Special Weather Statement | TWC | Santa Cruz | 33 min |
| Aug 19, 6:26 PM MST | Areal Flood Advisory | TWC | Pima | 94 min |
| Aug 19, 7:58 PM MST | Special Weather Statement | TWC | Cochise | 32 min |
| Aug 20, 12:00 PM MST | Flash Flood Warning | TWC | Cochise | 90 min |
| Aug 20, 3:30 PM MST | Special Weather Statement | TWC | Santa Cruz | 30 min |
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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.