Alert archive / Arizona / Flash Flood Warnings in 2011
Flash Flood Warning 39, NWS Tucson, AZ
NWS Tucson, AZ issued this flash flood warning at Aug 11, 2011, 2:18 PM MST for Santa Cruz County, Arizona. It was in force for 117 min. 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 11, 2011, 2:18 PM MST (21:18 UTC)
- Expired
- Aug 11, 2011, 4:15 PM MST
- In force
- 117 min
- Issued by
- NWS Tucson, AZ
- Area
- Storm-based polygon
- Flood severity
- None
County Santa Cruz County, AZ
The radar
The Tucson radar (KEMX), 50 km from the middle of the area, began a volume at 21:20 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
Tuscon, AZ (KTUS), launched 12:00Z, 9.3 hours before the alert went out and 75 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
- 1039 J/kg
- Mixed-layer CIN
- -48 J/kg
- Mixed-layer LCL
- 920 m above ground
- 0-6 km bulk shear
- 2 kt
- 0-1 km storm-relative helicity
- -8 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.
751 WGUS55 KTWC 112118 FFWTWC AZC023-112315- /O.NEW.KTWC.FF.W.0039.110811T2118Z-110811T2315Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE TUCSON AZ 218 PM MST THU AUG 11 2011 THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A * FLASH FLOOD WARNING FOR... CENTRAL SANTA CRUZ COUNTY IN SOUTHEAST ARIZONA... THIS INCLUDES THE CITY OF NOGALES... * UNTIL 415 PM MST * AT 212 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A THUNDERSTORM PRODUCING VERY HEAVY RAIN NEAR NOGALES...MOVING SOUTHWEST AT 5 MPH. WEATHER RADAR INDICATED BETWEEN 0.75 AND 1.5 INCHES OF RAIN HAS FALLEN ALONG HIGHWAY 82 BETWEEN PATAGONIA AND THE NOGALES AIRPORT. THE COMBINATION OF THE SLOW MOVEMENT OF THESE STORMS AND ADDITIONAL HEAVY THUNDERSTORMS MOVING INTO THE SAME AREA WILL RESULT IN FLASH FLOODING. 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 3157 11101 3162 11073 3135 11061 3135 11093 $$
2 follow-up statements
089 WGUS75 KTWC 112212 FFSTWC FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE TUCSON AZ 312 PM MST THU AUG 11 2011 AZC023-112315- /O.CON.KTWC.FF.W.0039.000000T0000Z-110811T2315Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SANTA CRUZ AZ- 312 PM MST THU AUG 11 2011 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 415 PM MST FOR CENTRAL SANTA CRUZ COUNTY... AT 300 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A MODERATE RAINFALL ACROSS CENTRAL SANTA CRUZ COUNTY. RADAR ESTIMATED BETWEEN 1 AND 2 INCHES OF RAIN HAD FALLEN...ESPECIALLY ALONG HIGHWAY 82 BETWEEN PATAGONIA AND NOGALES. THE NOGALES AIRPORT REPORTED 1.71 INCHES OF RAIN FROM THIS STORM. THE RAINFALL RUNOFF FROM HEAVY THUNDERSTORMS OVER THE PAST HOUR WILL CONTINUE TO RAPIDLY AND SWIFTLY DRAIN INTO NORMALLY DRY WASHES... ROADWAY DIPS AND OTHER LOW LYING AREAS. LAT...LON 3157 11101 3162 11073 3135 11061 3135 11093 $$
283 WGUS75 KTWC 112315 FFSTWC FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE TUCSON AZ 415 PM MST THU AUG 11 2011 AZC023-112325- /O.EXP.KTWC.FF.W.0039.000000T0000Z-110811T2315Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SANTA CRUZ AZ- 415 PM MST THU AUG 11 2011 ...THE FLASH FLOOD WARNING HAS EXPIRED FOR CENTRAL SANTA CRUZ COUNTY... LAT...LON 3157 11101 3162 11073 3135 11061 3135 11093 $$ CS
The office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 1:07 PM MST | Special Weather Statement | TWC | Cochise | 23 min |
| Aug 11, 1:24 PM MST | Areal Flood Advisory | TWC | Cochise, Santa Cruz | 81 min |
| Aug 11, 2:29 PM MST | Special Weather Statement | TWC | Greenlee | 31 min |
| Aug 11, 2:56 PM MST | Areal Flood Advisory | TWC | Pima | 2 hr |
| Aug 11, 4:58 PM MST | Areal Flood Advisory | TWC | Santa Cruz | 3 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.