Alert archive / Arizona / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 29, NWS Tucson, AZ
NWS Tucson, AZ issued this severe thunderstorm warning at Jul 19, 2009, 4:28 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 outline as issued.
The facts
- Issued
- Jul 19, 2009, 4:28 PM MST (23:28 UTC)
- Expired
- Jul 19, 2009, 5:15 PM MST
- In force
- 47 min
- Issued by
- NWS Tucson, AZ
- Area
- Storm-based polygon
County Pima County, AZ
The radar
The Tucson radar (KEMX), 32 km from the middle of the area, began a volume at 23:28 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 12:00Z, 11.5 hours before the alert went out and 37 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
- 61 J/kg
- Mixed-layer CIN
- -512 J/kg
- Mixed-layer LCL
- 3180 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- -11 m²/s²
- 0-3 km storm-relative helicity
- 17 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS55 KTWC 192328 SVRTWC AZC019-200015- /O.NEW.KTWC.SV.W.0029.090719T2328Z-090720T0015Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TUCSON AZ 428 PM MST SUN JUL 19 2009 THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHEASTERN PIMA COUNTY IN SOUTH CENTRAL ARIZONA... THIS INCLUDES THE CITY OF GREEN VALLEY... * UNTIL 515 PM MST * AT 427 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DESTRUCTIVE WINDS IN EXCESS OF 70 MPH. THIS STORM WAS LOCATED 6 MILES EAST OF GREEN VALLEY...AND MOVING NORTHWEST AT 5 MPH. * OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SAHUARITA PRECAUTIONARY/PREPAREDNESS ACTIONS... EXPECT DAMAGING WINDS IN EXCESS OF 60 MPH...LARGE HAIL...FREQUENT LIGHTNING...AND HEAVY RAIN WITH THIS STORM. && LAT...LON 3178 11111 3200 11101 3190 11076 3175 11082 TIME...MOT...LOC 2328Z 138DEG 5KT 3183 11090 $$
2 follow-up statements
000 WWUS55 KTWC 192344 SVSTWC SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE TUCSON AZ 444 PM MST SUN JUL 19 2009 AZC019-200015- /O.CON.KTWC.SV.W.0029.000000T0000Z-090720T0015Z/ PIMA AZ- 444 PM MST SUN JUL 19 2009 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM MST FOR SOUTHEASTERN PIMA COUNTY...INCLUDING GREEN VALLEY AND SAHUARITA... AT 441 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THAT THE STORM EAST OF GREEN VALLEY WAS DIMINISHING IN INTENSITY...BUT ANOTHER STORM WAS STRENGTHENING NEAR SAHUARITA WHICH WILL LIKELY PRODUCE DAMAGING WINDS AS WELL. THEREFORE...THE WARNING WILL REMAIN IN EFFECT UNTIL 515 PM MST. LAT...LON 3178 11111 3200 11101 3190 11076 3175 11082 TIME...MOT...LOC 2341Z 138DEG 5KT 3184 11091 $$
000 WWUS55 KTWC 200010 SVSTWC SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE TUCSON AZ 510 PM MST SUN JUL 19 2009 AZC019-200018- /O.EXP.KTWC.SV.W.0029.000000T0000Z-090720T0015Z/ PIMA AZ- 510 PM MST SUN JUL 19 2009 ...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN PIMA COUNTY INCLUDING GREEN VALLEY AND SAHUARITA WILL EXPIRE AT 515 PM MST... THE THUNDERSTORMS THAT PROMPTED THE WARNING FOR THE GREEN VALLEY AND SAHUARITA AREAS HAD DIMINISHED IN INTENSITY AND WERE NO LONGER EXPECTED TO PRODUCE WINDS IN EXCESS OF 60 MPH. HOWEVER...ANOTHER SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR MUCH OF THE GREATER TUCSON AREA UNTIL 600 PM MST. THE MAIN THREAT FROM THESE STORMS WILL BE LOCALLY DAMAGING WINDS. LAT...LON 3178 11111 3200 11101 3190 11076 3175 11082 TIME...MOT...LOC 0008Z 138DEG 5KT 3187 11094 $$
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 19, 1:31 PM MST, 2 hours 57 minutes earlier.
Area forecast discussion, Jul 19, 1:31 PM MST, 2 hours 57 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TUCSON AZ 130 PM MST SUN JULY 19 2009 .SYNOPSIS...STRONG HIGH PRESSURE ALOFT WILL BRING HOT CONDITIONS TO SOUTHEAST ARIZONA THROUGH AT LEAST THE MIDDLE OF THE WEEK. MOISTURE WILL ALSO BE SUFFICIENT FOR THE DAILY CYCLE OF SCATTERED MAINLY AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS. && .DISCUSSION...KEMX WSR-88D DETECTED ISOLATED 35-55 DBZ CELLS NEAR THE CATALINA MOUNTAINS AS WELL AS FAR SRN PIMA COUNTY AND WRN SANTA CRUZ COUNTY AT 2025Z. OTHER CELLS WERE JUST NE OF HANNAGAN MEADOW. VISIBLE SATELLITE IMAGERY INDICATED CUMULOFORM CLOUDS DEVELOPING ACROSS THE HIGHER TERRAIN OF THE FORECAST AREA. HAVE OPTED TO MAINTAIN THE SCENARIO OF ISOLATED-SCATTERED SHOWERS AND TSTMS THE REST OF THIS AFTERNOON AND INTO THIS EVENING. THE CONCERN WITH ANY THUNDERSTORMS WILL BE THE POTENTIAL FOR LOCALIZED STRONG/GUSTY WINDS PARTICULARLY GIVEN THE FAIRLY DRY SURFACE ENVIRONMENT. FOR INSTANCE KTUS DEWPOINT WAS 45 F AT 2020Z. BULK OF ACTIVITY EXPECTED TO END AROUND MIDNIGHT OR SO. SYNOPTIC-SCALE PATTERN PROGGED TO EXHIBIT ONLY VERY MINOR CHANGES THIS WEEK AS HIGH PRESSURE ALOFT TO REMAIN CENTERED OVER THE SWRN CONUS. THUS MONSOON MOISTURE TO CONTINUE ACROSS THE AREA. BASED ON 19/12Z GFS/ECMWF SOLUTIONS...DIFFICULT TO DISCERN FEATURES WITHIN THE FLOW THAT WOULD SIGNIFY A MORE-PRONOUNCED CONVECTIVELY-ACTIVE DAY FROM ANOTHER. SO WILL CONTINUE TO DEPICT EITHER A SLIGHT CHANCE OR LOW-END CHANCE-CATEGORY POPS DURING THE AFTERNOON AND EVENING PERIODS. DAYTIME HIGH TEMPS DURING MUCH OF THIS FORECAST PERIOD TO BE ABOUT 5-10 DEGS ABOVE NORMAL. && .AVIATION...EXPECT ISOLATED TO SCATTERED TSRA/SHRA THE REST OF THIS AFTERNOON AND EVENING. THE STRONGEST TSRA WILL BE ACCOMPANIED WITH WIND GUSTS OF 40-45 KTS. OTHERWISE...SCATTERED TO BROKEN CUMULOFORM CLOUDS WITH BASES 11-13K FT AGL. TSRA/SHRA TO DECREASE IN COVERAGE AFTER 04Z AND ANY CONVECTIVE CLOUD DEBRIS TO DISSIPATE LATE TONIGHT. SURFACE WINDS SWLY/WLY 5-15 KTS THRU 06Z THEN SLY/SELY 5-15 KTS LATE TONIGHT AND INTO MONDAY MORNING. AVIATION DISCUSSION NOT UPDATED FOR TAF AMENDMENTS. && .FIRE WEATHER...ISOLATED TO SCATTERED THUNDERSTORMS WILL OCCUR THIS WEEK...WITH THE BULK OF ACTIVITY DURING THE AFTERNOON AND EARLY NIGHTTIME HOURS. SURFACE WINDS GENERALLY FROM THE SOUTHWEST AND WEST THE REST OF THIS AFTERNOON AND THIS EVENING...THEN A DIURNALLY DRIVEN WIND REGIME ON TAP MONDAY INTO WEDNESDAY. && .TWC WATCHES/WARNINGS/ADVISORIES...NONE. BF WEATHER.GOV/TUCSON
Hazardous weather outlook, Jul 19, 9:30 AM MST, 6 hours 58 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TUCSON AZ 930 AM MST SUN JUL 19 2009 AZZ019-030-034-035-201200- NORTHERN GREENLEE COUNTY-UPPER GILA RIVER VALLEY- SANTA CRUZ COUNTY-COCHISE COUNTY- 930 AM MST SUN JUL 19 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST ARIZONA. .DAY ONE...TODAY AND TONIGHT EXPECT ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS ACROSS THE AREA INTO THIS EVENING. THE STRONGEST STORMS MAY PRODUCE BRIEF HEAVY RAIN AND WIND GUSTS UP TO 45 MPH. THE BULK OF THE ACTIVITY IS FORECAST TO END BY AROUND MIDNIGHT. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THE DAILY CYCLE OF ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS IS EXPECTED MONDAY THROUGH SATURDAY...MAINLY DURING THE AFTERNOON AND EARLY NIGHTTIME HOURS. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. AZZ029-031>033-201200- SOUTHEAST PINAL COUNTY-WESTERN PIMA COUNTY-TOHONO OODHAM NATION- TUCSON METRO/MARANA/GREEN VALLEY- 930 AM MST SUN JUL 19 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTH CENTRAL ARIZONA AND SOUTHEAST ARIZONA. .DAY ONE...TODAY AND TONIGHT EXPECT ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS ACROSS THE AREA INTO THIS EVENING. THE STRONGEST STORMS MAY PRODUCE BRIEF HEAVY RAIN...WIND GUSTS UP TO 45 MPH...AND REDUCED VISIBILITIES DUE TO BLOWING DUST. THE BULK OF THE ACTIVITY IS FORECAST TO END BY AROUND MIDNIGHT. ALSO...NEAR RECORD HIGH TEMPERATURES ARE ON TAP THIS AFTERNOON FOR SOUTHEAST PINAL AND PIMA COUNTIES. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THE DAILY CYCLE OF ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS IS EXPECTED MONDAY THROUGH SATURDAY...MAINLY DURING THE AFTERNOON AND EARLY NIGHTTIME HOURS. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. WEATHER.GOV/TUCSON
The office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 19, 4:55 PM MST | Severe Thunderstorm Warning | TWC | Pima | 65 min |
Nearby
Severe Thunderstorm Warnings in Arizona, 2009Every severe thunderstorm warning in 2009
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.