Alert archive / Arizona / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 28, NWS Tucson, AZ

July 23, 2003Pima County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Jul 23, 2003, 6:30 PM MST for Pima County, Arizona. It was in force for 30 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
Jul 23, 2003, 6:30 PM MST (01:30 UTC)
Expired
Jul 23, 2003, 7:00 PM MST
In force
30 min
Issued by
NWS Tucson, AZ
Area
Counties, with a storm outline in the text

County Pima County, AZ

The radar

The Tucson radar (KEMX), 56 km from the middle of the area, began a volume at 01:32 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Tuscon, AZ (KTUS), launched 00:00Z, 1.5 hours before the alert went out and 30 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 2003-07-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1131 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, Tuscon, AZ at 00:00Z on 2003-07-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 16 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
1131 J/kg
Mixed-layer CIN
-18 J/kg
Mixed-layer LCL
3204 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
16 m²/s²
0-3 km storm-relative helicity
104 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.

005 
WUUS55 KTWC 240130
SVRTWC
AZC019-240200-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
630 PM MST WED JUL 23 2003

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL PIMA COUNTY IN ARIZONA

* UNTIL 700 PM MST

* AT 630 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 8 MILES EAST OF THREE POINTS...OR ABOUT 16
  MILES SOUTHWEST OF TUCSON...MOVING WEST AT 5 MPH.

LARGE HAIL IS LIKELY. PUT YOUR VEHICLE IN A GARAGE OR CARPORT AND
MOVE TO A STURDY SHELTER.

LAT...LON 3196 11116 3211 11104 3223 11125 3206 11136

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 23, 3:05 PM MST, 3 hours 25 minutes earlier.

Area forecast discussion, Jul 23, 3:05 PM MST, 3 hours 25 minutes before
SOUTHEAST ARIZONA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TUCSON AZ
305 PM MST WED JUL 23 2003

.SYNOPSIS...HIGH PRESSURE CENTERED OVER NEVADA WILL SLOWLY MOVE
TOWARD THE FOUR CORNERS REGION BY FRIDAY. WEAK DISTURBANCES ROTATING
AROUND THE HIGH WILL PROVIDE SCATTERED AFTERNOON AND EVENING SHOWERS
AND THUNDERSTORMS THROUGH FRIDAY. AN INCREASE IN SHOWERS AND
THUNDERSTORMS IS EXPECTED BY SUNDAY AS A STRONGER DISTURBANCE MOVES
TOWARD SOUTHEAST ARIZONA.

.DISCUSSION...KEMX WSR-88D DETECTED SCATTERED MOSTLY LESS THAN 40
DBZ ECHOES MAINLY NEAR THE ERN MOUNTAINS MOVING SLOWLY NWWD AT
2140Z. CELL E BENSON APPROACHED 60 KG/M2 WORTHY OF SEVERE TSTM
WARNING. VISIBLE SATELLITE IMAGERY INDICATED GENERALLY CLEAR SKIES
ACROSS WRN SECTIONS WITH CUMULIFORM CLOUDINESS OVER CENTRAL/ERN
LOCALES. DEWPOINTS WERE IN THE LOWER-MID 50S F ERN SECTIONS WHILE
REMAINING AROUND 60 F TUS VICINITY WWD. BELIEVE SHOWERS/TSTMS WILL
DEVELOP DURING THE NEXT FEW HOURS BUT WILL BE SLOW TO MOVE TOWARD
VALLEYS. BEST CHANCE PRECIP TUS VICINITY SHOULD BE AFTER 01-02Z OR
SUCH PER LATEST MESO-ETA/MM5 OUTPUT. WILL OPT FOR SCATTERED EVENING
SHOWERS/THUNDERSTORMS WITH EXPECTATION OF ACTIVITY WANING EARLY ERN
SECTIONS THOUGH PERHAPS LINGERING ACROSS CENTRAL LOCALES. ONLY
ISOLATED EVENING THUNDERSTORMS EXPECTED ZONES 31/32. 23/12Z NWP
MODELS WERE WELL INITIALIZED PER PMDHMD. ETA/GFS CONCUR THAT AN
INCREASE IN CONVECTIVE DEVELOPMENT TO OCCUR THUR AFTERNOON/NIGHT AS
DEPICTED BY H5-H3 OMEGA/DIVERGENCE/TOTAL DEFORMATION FIELDS. THUS
WILL TREND POPS UPWARD MAINLY THUR EVENING TO REFLECT THIS SCENARIO.
UPPER HIGH TO MOVE TOWARD SRN CO BY SAT. AVN DEPICTS INVERTED TROF
TO ROTATE AROUND SE PERIPHERY OF HIGH ACROSS TX SAT AND TOWARD SE AZ
BY SUN. PER COORD WITH WFO/S PSR/FGZ WILL ADJUST POPS UPWARD SUN AND
TREND DOWNWARD SLIGHTLY MON AS SYSTEM MOVES WWD. LOW CONFIDENCE WITH
REGARD TO GFS/MRF TUE-WED SOLUTION PERTAINING TO SWRN CONUS/NRN BAJA
TROF. SO WILL MAINTAIN GENERIC POP SCENARIO FOR THE MOMENT. WILL
TREND DAYTIME MAX TEMPS DOWNWARD STARTING FRI WITH EXPECTATION THAT
SUN WILL BE COOLEST DAY GIVEN PROGGED PRECIPITATION.  BF

.TWC...NONE.
Hazardous weather outlook, Jul 23, 12:30 PM MST, 6 hours before
AZZ019-029>035-241400-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TUCSON AZ
1230 PM MST WED JUL 23 2003

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST ARIZONA

.DAY ONE...TODAY

SYNOPSIS...THUNDERSTORMS LAST NIGHT COOLED THE LOWER LAYERS OF THE
ATMOSPHERE WHICH GENERALLY LEADS TO LESS ACTIVITY ON THE FOLLOWING
DAY. THIS SHOULD CONFINE THE THUNDERSTORM ACTIVITY TO MAINLY THE
MOUNTAINS THIS AFTERNOON WITH THUNDERSTORMS MOVING INTO THE VALLEYS
THIS EVENING. NUMERICAL MODELS DO NOT INDICATE SIGNIFICANT ORGANIZED
CONVECTION TODAY...ALTHOUGH STORMS WILL PRODUCE LOCALLY HEAVY RAIN
DUE TO THE HIGH MOISTURE CONTENT OF THE ATMOSPHERE.

.DISCUSSION...TUCSON SOUNDING SIMILAR TO YESTERDAY ALTHOUGH LOW
LEVELS COOLED SOMEWHAT...ESPECIALLY PHOENIX SOUNDING WHICH DOES NOT
APPEAR ABLE TO SUPPORT SURFACED BASED STORMS. THE ONLY FACTOR THAT
MAY PUSH STORMS OFF THE MOUNTAINS IS FAIRLY STRONG MID LEVEL WINDS
OF 20 KNOTS OR SO. FIRST STORMS WILL DEVELOP...RAIN...AND MOVE OFF
MOUNTAINS AND THEN DISSIPATE AFTER THEY MOVE INTO VALLEYS. BY
EVENING...STORMS SHOULD BE ABLE TO MOVE INTO VALLEYS. AT THIS TIME
IT DOES NOT LOOK LIKE STORMS WILL PUSH MUCH FARTHER OUT IN THE
DESERTS THAN MARANA...BUT THE TUCSON VALLEY AS WELL AS THE I-19
CORRIDOR SEEM TO HAVE THE BEST POTENTIAL FOR THE HEAVIEST RAINS.

STORM MOTION WILL BE TO THE WEST TO NORTHWEST AT 15 MPH.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH WEDNESDAY.

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

SUFFICIENT MOISTURE WILL BE IN PLACE FOR A STANDARD SUMMERTIME
THUNDERSTORM SEASON FORECAST. EXPECT SCATTERED MAINLY AFTERNOON AND
EVENING SHOWERS AND THUNDERSTORMS.

.SPOTTER INFORMATION STATEMENT...

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

In the hours before

Local storm report, Jul 23, 5:21 PM MST, 1 hour 9 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TUCSON AZ
0521 PM MST WED JUL 23 2003

TIME(MST)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0430 PM    ORACLE                    AZ   0.75 IN HAIL
07/23/03   PINAL

VPH

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 23, 6:30 PM MSTFlash Flood WarningTWCSanta Cruz
Jul 24, 3:04 PM MSTSevere Thunderstorm WarningTWCSanta Cruz41 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2003Every severe thunderstorm warning in 2003

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.