Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 46, NWS Tucson, AZ

August 26, 2012Cochise County, Arizona

NWS Tucson, AZ issued this flash flood warning at Aug 26, 2012, 6:13 PM MST for Cochise County, Arizona. It was in force for 92 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 26, 2012, 6:13 PM MST (01:13 UTC)
Expired
Aug 26, 2012, 7:45 PM MST
In force
92 min
Issued by
NWS Tucson, AZ
Area
Storm-based polygon
Flood severity
None

County Cochise County, AZ

The radar

The Tucson radar (KEMX), 136 km from the middle of the area, began a volume at 01:13 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 (KDMA), launched 00:00Z, 1.2 hours before the alert went out and 157 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.

Skew-T log-pSkew-T log-p diagram, Tuscon, AZ at 00:00Z on 2012-08-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 67 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tuscon, AZ at 00:00Z on 2012-08-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -10 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
67 J/kg
Mixed-layer CIN
-25 J/kg
Mixed-layer LCL
2898 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
-10 m²/s²
0-3 km storm-relative helicity
29 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

114 
WGUS55 KTWC 270113
FFWTWC
AZC003-270245-
/O.NEW.KTWC.FF.W.0046.120827T0113Z-120827T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
613 PM MST SUN AUG 26 2012

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN COCHISE COUNTY IN SOUTHEAST ARIZONA...

* UNTIL 745 PM MST

* AT 610 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  AN AREA OF STRONG THUNDERSTORMS PRODUCING VERY HEAVY RAIN IN THE 
  SAN SIMON AREA. RADAR RAINFALL ESTIMATES FROM THIS AREA INDICATE 
  THAT UP TO TWO INCHES OF RAINFALL HAS OCCURRED IN THE LAST HOUR.   

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SAN SIMON

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF WASHES
AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE BANKS OF
CREEKS AND STREAMS.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.

&&

LAT...LON 3206 10918 3210 10934 3230 10942 3240 10938
      3239 10906 3212 10905

$$
ZELL
2 follow-up statements
045 
WGUS75 KTWC 270158
FFSTWC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
658 PM MST SUN AUG 26 2012

AZC003-270245-
/O.CON.KTWC.FF.W.0046.000000T0000Z-120827T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
COCHISE AZ-
658 PM MST SUN AUG 26 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 745 PM MST FOR
NORTHEASTERN COCHISE COUNTY...

AT 655 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE AN AREA OF THUNDERSTORMS IN THE SAN SIMON AREA. ALTHOUGH 
THE STRENGTH OF THESE THUNDERSTORMS HAS DIMINISHED...RADAR RAINFALL 
ESTIMATES INDICATE THAT BETWEEN TWO AND THREE INCHES OF RAINFALL HAS 
OCCURRED IN THIS AREA IN THE LAST HOUR.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SAN SIMON

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.

&&

LAT...LON 3206 10918 3210 10934 3230 10942 3240 10938
      3239 10906 3212 10905

$$
ZELL
433 
WGUS75 KTWC 270249
FFSTWC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
749 PM MST SUN AUG 26 2012

AZC003-270255-
/O.EXP.KTWC.FF.W.0046.000000T0000Z-120827T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
COCHISE AZ-
749 PM MST SUN AUG 26 2012

...THE FLASH FLOOD WARNING HAS EXPIRED FOR NORTHEASTERN COCHISE
COUNTY...

AT 743 PM MST...NATIONAL WEATHER SERVICE RADAR INDICATED THAT LIGHT 
TO MODERATE RAIN REMAINED ACROSS PORTIONS OF NORTHEASTERN COCHISE 
COUNTY. THE HEAVY RAINFALL HAS COME TO AN END. THE EARLIER HEAVY 
RAIN WILL CONTINUE TO CAUSE RUNOFF THROUGH THE MID EVENING HOURS... 
ALONG WITH PONDING OF WATER IN LOW SPOTS AND DIPS. A SMALL STREAM 
FLOOD ADVISORY REMAINS IN EFFECT FOR THIS AREA UNTIL 830 PM MST THIS 
EVENING.

LAT...LON 3206 10918 3210 10934 3230 10942 3240 10938
      3239 10906 3212 10905

$$
ZELL

The office that day

Everything else NWS Tucson, AZ issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 26, 5:34 PM MSTAreal Flood AdvisoryTWCCochise, Graham, Greenlee86 min
Aug 26, 7:01 PM MSTAreal Flood AdvisoryTWCCochise, Graham, Greenlee89 min
Aug 27, 3:26 PM MSTSpecial Weather StatementTWCSanta Cruz34 min
Aug 27, 4:17 PM MSTSpecial Weather StatementTWCSanta Cruz58 min

Nearby

Flash Flood Warnings in Arizona, 2012Every flash flood warning in 2012

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.