Alert archive / Arizona / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 20, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this severe thunderstorm warning at Sep 12, 2009, 2:10 PM MST for Yavapai County, Arizona. It was in force for 32 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
- Sep 12, 2009, 2:10 PM MST (21:10 UTC)
- Expired
- Sep 12, 2009, 2:42 PM MST
- In force
- 32 min
- Issued by
- NWS Flagstaff, AZ
- Area
- Storm-based polygon
County Yavapai County, AZ
The radar
The Flagstaff radar (KFSX), 124 km from the middle of the area, began a volume at 21:13 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
Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 9.2 hours before the alert went out and 98 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
- 23 J/kg
- Mixed-layer CIN
- -147 J/kg
- Mixed-layer LCL
- 1862 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- -58 m²/s²
- 0-3 km storm-relative helicity
- -58 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Flagstaff, AZ wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 12, 10:45 AM MST, 3 hours 25 minutes earlier.
Area forecast discussion, Sep 12, 10:45 AM MST, 3 hours 25 minutes before
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</html>Hazardous weather outlook, Sep 12, 10:10 AM MST, 4 hours before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 1010 AM MST SAT SEP 12 2009 AZZ004>018-037>040-130700- WESTERN MOGOLLON RIM-GRAND CANYON COUNTRY-YAVAPAI COUNTY MOUNTAINS- YAVAPAI COUNTY VALLEYS AND BASINS-OAK CREEK AND SYCAMORE CANYONS- MARBLE AND GLEN CANYONS-KAIBAB PLATEAU-COCONINO PLATEAU- NORTHEAST PLATEAU AND MESAS HWY 264 NORTHWARD- NORTHEAST PLATEAU AND MESAS SOUTH OF HWY 264- CHINLE VALLEY-CHUSKA MOUNTAINS AND DEFIANCE PLATEAU- BLACK MESA AREA-LITTLE COLORADO RIVER VALLEY IN COCONINO COUNTY- LITTLE COLORADO RIVER VALLEY IN NAVAJO COUNTY- LITTLE COLORADO RIVER VALLEY IN APACHE COUNTY- EASTERN MOGOLLON RIM-WHITE MOUNTAINS-NORTHERN GILA COUNTY- 1010 AM MST SAT SEP 12 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR APACHE...COCONINO...NORTHERN GILA...NAVAJO...AND YAVAPAI COUNTIES IN NORTHERN ARIZONA. .DAY ONE...TODAY THE MAIN THUNDERSTORM THREAT AREA WILL BE OVER THE EASTERN MOGOLLON RIM...WHITE MOUNTAINS...WITH STORMS SHIFTING SOUTH INTO PORTIONS OF ...SOUTHEAST YAVAPAI AND NORTHERN GILA COUNTY BY EARLY EVENING. THE WEATHER HAZARD TODAY WILL BE HEAVY RAIN AND LOCALIZED FLOODING AND HAIL FROM THE STRONGER THUNDERSTORMS...FROM THE EASTERN MOGOLLON RIM AND WHITE MOUNTAINS SOUTH. THUNDERSTORMS WILL GET A LITTLE LATER START TODAY OVER THE EASTERN RIM AND WHITE MOUNTAINS...POSSIBLY BY NOON. FOR THE REMAINDER OF THE AREA THUNDERSTORMS WILL DEVELOP BY EARLY TO LATE AFTERNOON...WITH A SLIGHT INCREASE DURING THE EVENING HOURS. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY MOISTURE WILL LINGER OVER THE REGION...AND INTERACT WITH A COUPLE OF WEATHER SYSTEMS MOVING THROUGH THE AREA DURING THE FORECAST PERIOD. SCATTERED TO POSSIBLY NUMEROUS THUNDERSTORMS WILL DEVELOP BY SUNDAY AFTERNOON AND CONTINUE INTO MONDAY EVENING. A LOW PRESSURE SYSTEM IS FORECAST TO MOVE INTO NEVADA LATE SUNDAY AND MOVE ACROSS UTAH LATE MONDAY. THIS WEATHER SYSTEM WILL INCREASE OUR CHANCES FOR SHOWERS AND THUNDERSTORMS...ESPECIALLY SUNDAY NIGHT INTO MONDAY. THE MAIN WEATHER IMPACTS WILL BE ISOLATED HAIL AND LOCALIZED AREAS OF HEAVY RAINFALL AND POSSIBLE FLASH FLOODING FROM THE STRONGER STORMS. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
The office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 12, 2:29 PM MST | Areal Flood Advisory | FGZ | Yavapai | 4 hr |
| Sep 12, 3:32 PM MST | Areal Flood Advisory | FGZ | Coconino, Yavapai | 3 hr |
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.