Alert archive / Arizona / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 42, NWS Tucson, AZ

July 29, 2010Pinal County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Jul 29, 2010, 1:19 PM MST for Pinal County, Arizona. It was in force for 26 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jul 29, 2010, 1:19 PM MST (20:19 UTC)
Expired
Jul 29, 2010, 1:45 PM MST
In force
26 min
Issued by
NWS Tucson, AZ
Area
Storm-based polygon

County Pinal County, AZ

The radar

The Phoenix radar (KIWA), 52 km from the middle of the area, began a volume at 20:21 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 12:00Z, 8.3 hours before the alert went out and 82 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, Phoenix, AZ at 12:00Z on 2010-07-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 879 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Phoenix, AZ at 12:00Z on 2010-07-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 37 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
879 J/kg
Mixed-layer CIN
-138 J/kg
Mixed-layer LCL
1305 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
37 m²/s²
0-3 km storm-relative helicity
30 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Tucson, AZ wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 29, 9:16 AM MST, 4 hours 3 minutes earlier.

Area forecast discussion, Jul 29, 9:16 AM MST, 4 hours 3 minutes before
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Hazardous weather outlook, Jul 29, 9:43 AM MST, 3 hours 36 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TUCSON AZ
943 AM MST THU JUL 29 2010

AZZ019-029>035-300700-
NORTHERN GREENLEE COUNTY-SOUTHEAST PINAL COUNTY-
UPPER GILA RIVER VALLEY-WESTERN PIMA COUNTY-TOHONO OODHAM NATION-
TUCSON METRO/MARANA/GREEN VALLEY-SANTA CRUZ COUNTY-COCHISE COUNTY-
943 AM MST THU JUL 29 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTH CENTRAL
ARIZONA AND SOUTHEAST ARIZONA.

.DAY ONE...TODAY AND TONIGHT

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON INTO
THIS EVENING WITH DAMAGING WIND GUSTS FROM WET MICROBURTS THE MAIN
THREAT.

THUNDERSTORMS WILL DEVELOP THIS AFTERNOON AND MOVE SLOWLY WESTWARD
THROUGH THE EVENING HOURS. SOME STORMS COULD PRODUCE DAMAGING
WIND GUSTS TO 60 MPH. VERY HEAVY RAIN OF 2 INCHES IN ONE HOUR
COULD LEAD TO FLASH FLOODING.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

THE THREAT OF HEAVY RAIN AND FLASH FLOODING WILL CONTINUE THROUGH
THE WEEKEND...AND INTO NEXT WEEK. LOCALLY DAMAGING WINDS FROM
STRONG THUNDERSTORMS ARE ALSO POSSIBLE.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

DROZD

WEATHER.GOV/TUCSON

In the hours before

Special weather statement, Jul 29, 11:56 AM MST, 1 hour 23 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
1156 AM MST THU JUL 29 2010

AZZ029-291945-
SOUTHEAST PINAL COUNTY AZ-
1156 AM MST THU JUL 29 2010

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN PINAL COUNTY UNTIL 1245
PM MST...

AT 1150 AM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
A STRONG THUNDERSTORM JUST EAST OF RED ROCK ALONG INTERSTATE 10...OR
ABOUT 10 MILES NORTHWEST OF MARANA...MOVING NORTH AT 5 MPH.

WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH
TORRENTIAL RAIN OF OVER AN INCH IN LESS THAN A HALF AN HOUR.

AREAS AFFECTED BY THIS STORM INCLUDE...RED ROCK AND PICACHO PEAK.

THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND
TV STATIONS FOR ADDITIONAL INFORMATION AND POSSIBLE WARNINGS FROM
THE NATIONAL WEATHER SERVICE. BE PREPARED FOR SHARP VISIBILITY
REDUCTIONS IN HEAVY RAIN ALONG INTERSTATE 10.

&&

LAT...LON 3267 11147 3267 11123 3253 11114 3252 11137
TIME...MOT...LOC 1855Z 158DEG 6KT 3257 11127

PYTLAK

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 28, 6:30 PM MSTSpecial Weather StatementTWCSanta Cruz45 min
Jul 28, 6:38 PM MSTAreal Flood AdvisoryTWCSanta Cruz112 min
Jul 28, 6:43 PM MSTSpecial Weather StatementTWCGreenlee62 min
Jul 28, 7:14 PM MSTAreal Flood AdvisoryTWCPima, Pinal, Santa Cruz71 min
Jul 28, 7:17 PM MSTAreal Flood AdvisoryTWCGraham, Greenlee4 hr
Jul 28, 11:07 PM MSTAreal Flood AdvisoryTWCGraham, Greenlee113 min
Jul 29, 11:56 AM MSTSpecial Weather StatementTWCPinal49 min
Jul 29, 12:37 PM MSTAreal Flood AdvisoryTWCPinal113 min
Jul 29, 1:14 PM MSTAreal Flood AdvisoryTWCPima, Pinal2 hr
Jul 29, 2:18 PM MSTFlash Flood WarningTWCPima117 min
Jul 29, 2:28 PM MSTAreal Flood AdvisoryTWCPima, Pinal2 hr
Jul 29, 3:50 PM MSTAreal Flood AdvisoryTWCCochise, Santa Cruz115 min
Jul 29, 4:29 PM MSTAreal Flood AdvisoryTWCPima2 hr

Nearby

Severe Thunderstorm Warnings in Arizona, 2010Every severe thunderstorm warning in 2010

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.