Alert archive / Arizona / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 35, NWS Tucson, AZ

July 10, 1999Pima County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Jul 10, 1999, 2:13 PM MST for Pima County, Arizona. It was in force for 47 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 10, 1999, 2:13 PM MST (21:13 UTC)
Expired: Jul 10, 1999, 3:00 PM MST
In force: 47 min
Issued by: NWS Tucson, AZ
Area: Whole counties

County Pima County, AZ

The radar

The Tucson radar (KEMX), 112 km from the middle of the area, began a volume at 21:15 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, 9.2 hours before the alert went out and 84 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 168 J/kg
Mixed-layer CIN: -159 J/kg
Mixed-layer LCL: 1549 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 47 m²/s²
0-3 km storm-relative helicity: 69 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 10, 9:30 AM MST, 4 hours 43 minutes earlier.

Area forecast discussion, Jul 10, 9:30 AM MST, 4 hours 43 minutes before

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In the hours before

Special weather statement, Jul 10, 12:45 PM MST, 1 hour 28 minutes before

AZZ019-029>035-110500-
SPECIAL WEATHER STATEMENT...SOUTHEAST ARIZONA CONVECTIVE OUTLOOK
NATIONAL WEATHER SERVICE TUCSON AZ
1245 PM MST SAT JUL 10 1999...THIS PRODUCT IS NOT UPDATED

                          *CONDITIONAL*   *CONDITIONAL*
COUNTY            AREAL    PROBABILITY  RAIN GREATER THAN   STORM
                 COVERAGE   OF SEVERE     1.00      2.00    MOTION

COCHISE             50          15         45        15     W 8
GRAHAM              45          15         45        15     W 8
GREENLEE            25           5         30         5     W 8
TUCSON/ERN PIMA     60          25         60        20     W 8
TOHONO OODHAM      40          30         45        10     W 8
SOUTHEAST PINAL     50          20         50        15     W 8
WESTERN PIMA        30          30         30         5     W 8
SANTA CRUZ          60          20         60        20     W 8

SYNOPSIS...A COLD FRONT WILL CONTINUE TO TRIGGER THUNDERSTORM
DEVELOPMENT ACROSS SOUTHEAST ARIZONA THIS AFTERNOON AND EVENING.
THE PRIMARY THREAT WILL BE HEAVY RAIN AND THE AREA OF CONCERN WILL
BE FROM WESTERN COCHISE AND GRAHAM COUNTIES WESTWARD THROUGH THE
TUCSON METRO AREA TO SOUTHEAST PINAL COUNTY AND THE TOHONO OODHAM
NATION.
*****************************************************************
KEY...
AREAL COVERAGE - PERCENT OF COUNTY OR AREA THAT WILL EXPERIENCE
                 THUNDERSTORMS
PROB OF SEVERE - THE PROBABILITY THAT AN INDIVIDUAL STORM WILL
                 REACH SEVERE LEVELS (DAMAGING WIND AND/OR
                 LARGE HAIL)
RAIN GRTR THAN - THE PROBABILITY THAT AN INDIVIDUAL STORM WILL
                 PRODUCE RAIN EXCEEDING 1 INCH OR 2 INCHES IN
                 ANY LOCATION
STORM MOTION   - GENERAL DIRECTION TO WHICH THE STORMS WILL
                 LIKELY MOVE AND SPEED IN MPH

NOTE...
VALID TIME IS FROM 12:45 PM TO 12 MIDNIGHT OF THE DAY OF ISSUANCE.
THIS PRODUCT IS NOT TO BE USED IN PLACE OF SEVERE THUNDERSTORM OR
FLASH FLOOD WARNINGS OR WATCHES. THIS PRODUCT IS ONLY USED FOR
OUTLOOK PURPOSES. CORRESPONDING GRAPHICS MAY BE FOUND ON THE NWS
TUCSON INTERNET PAGE AT
HTTP://NIMBO.WRH.NOAA.GOV/TUCSON/SWO/SWO.SHTML

END/OKULSKI

Special weather statement, Jul 10, 12:45 PM MST, 1 hour 28 minutes before

AZZ019-029>035-110500-
SPECIAL WEATHER STATEMENT...SOUTHEAST ARIZONA CONVECTIVE OUTLOOK
NATIONAL WEATHER SERVICE TUCSON AZ
1245 PM MST SAT JUL 10 1999...THIS PRODUCT IS NOT UPDATED

                          *CONDITIONAL*   *CONDITIONAL*
COUNTY            AREAL    PROBABILITY  RAIN GREATER THAN   STORM
                 COVERAGE   OF SEVERE     1.00      2.00    MOTION

COCHISE             50          15         45        15     W 8
GRAHAM              45          15         45        15     W 8
GREENLEE            25           5         30         5     W 8
TUCSON/ERN PIMA     60          25         60        20     W 8
TOHONO OODHAM      40          30         45        10     W 8
SOUTHEAST PINAL     50          20         50        15     W 8
WESTERN PIMA        30          30         30         5     W 8
SANTA CRUZ          60          20         60        20     W 8

SYNOPSIS...A COLD FRONT WILL CONTINUE TO TRIGGER THUNDERSTORM
DEVELOPMENT ACROSS SOUTHEAST ARIZONA THIS AFTERNOON AND EVENING.
THE PRIMARY THREAT WILL BE HEAVY RAIN AND THE AREA OF CONCERN WILL
BE FROM WESTERN COCHISE AND GRAHAM COUNTIES WESTWARD THROUGH THE
TUCSON METRO AREA TO SOUTHEAST PINAL COUNTY AND THE TOHONO OODHAM
NATION.
*****************************************************************
KEY...
AREAL COVERAGE - PERCENT OF COUNTY OR AREA THAT WILL EXPERIENCE
                 THUNDERSTORMS
PROB OF SEVERE - THE PROBABILITY THAT AN INDIVIDUAL STORM WILL
                 REACH SEVERE LEVELS (DAMAGING WIND AND/OR
                 LARGE HAIL)
RAIN GRTR THAN - THE PROBABILITY THAT AN INDIVIDUAL STORM WILL
                 PRODUCE RAIN EXCEEDING 1 INCH OR 2 INCHES IN
                 ANY LOCATION
STORM MOTION   - GENERAL DIRECTION TO WHICH THE STORMS WILL
                 LIKELY MOVE AND SPEED IN MPH

NOTE...
VALID TIME IS FROM 12:45 PM TO 12 MIDNIGHT OF THE DAY OF ISSUANCE.
THIS PRODUCT IS NOT TO BE USED IN PLACE OF SEVERE THUNDERSTORM OR
FLASH FLOOD WARNINGS OR WATCHES. THIS PRODUCT IS ONLY USED FOR
OUTLOOK PURPOSES. CORRESPONDING GRAPHICS MAY BE FOUND ON THE NWS
TUCSON INTERNET PAGE AT
HTTP://NIMBO.WRH.NOAA.GOV/TUCSON/SWO/SWO.SHTML

END/OKULSKI

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 6:21 PM MST	Flash Flood Warning	TWC	Cochise	89 min
Jul 10, 1:33 PM MST	Severe Thunderstorm Warning	TWC	Pima	47 min
Jul 10, 2:53 PM MST	Flash Flood Warning	TWC	Pima	67 min

Nearby

Severe Thunderstorm Warnings in Arizona, 1999 Every severe thunderstorm warning in 1999

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.