Alert archive / Arizona / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 35, NWS Flagstaff, AZ

July 23, 2007Apache County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Jul 23, 2007, 3:40 PM MST for Apache County, Arizona. It was in force for 20 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 23, 2007, 3:40 PM MST (22:40 UTC)
Expired: Jul 23, 2007, 4:00 PM MST
In force: 20 min
Issued by: NWS Flagstaff, AZ
Area: Counties, with a storm outline in the text

County Apache County, AZ

The radar

The Flagstaff radar (KFSX), 181 km from the middle of the area, began a volume at 22:42 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, 10.7 hours before the alert went out and 210 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: 84 J/kg
Mixed-layer CIN: -44 J/kg
Mixed-layer LCL: 1020 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: -3 m²/s²
0-3 km storm-relative helicity: 20 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 Flagstaff, AZ wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 23, 3:35 PM MST, 5 minutes earlier.

Area forecast discussion, Jul 23, 3:35 PM MST, 5 minutes before

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Hazardous weather outlook, Jul 23, 2:55 PM MST, 45 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
255 PM MST MON JUL 23 2007

AZZ004>018-037>040-240700-
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-
255 PM MST MON JUL 23 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR APACHE...COCONINO...NORTHERN
GILA...NAVAJO...AND YAVAPAI COUNTIES IN NORTHERN ARIZONA.

.DAY ONE...TODAY

SCATTERED THUNDERSTORMS...MANY WITH VERY HEAVY RAINFALL...ARE
EXPECTED ACROSS MOST OF NORTHERN ARIZONA THROUGH THIS EVENING. MANY
STORMS WILL CONTAIN FREQUENT LIGHTNING...VERY HEAVY RAIN...AND SMALL
HAIL. FLASH FLOODING IS LIKELY FROM THE HEAVIER AND SLOWER MOVING
STORMS. A FLASH FLOOD WATCH HAS BEEN ISSUED FOR ALL OF NORTHERN
ARIZONA INCLUDING COCONINO COUNTY...YAVAPAI COUNTY...NAVAJO
COUNTY...APACHE COUNTY...AND NORTHERN GILA COUNTY. SEE THE FLASH
FLOOD WATCH (PRODUCT PHXFFAFGZ) FOR DETAILS.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

SCATTERED MAINLY AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS
ARE EXPECTED THROUGH THE PERIOD.

.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, 11:37 AM MST, 4 hours 3 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
1137 AM MST MON JUL 23 2007

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1135 AM     HAIL             5 N ASH FORK            35.29N 112.49W
07/23/2007  E1.00 INCH       COCONINO           AZ   TRAINED SPOTTER

            1 INCH HAIL 1130 TO 1135 AND CONTINUING

&&

BYRONP

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 11:31 AM MST	Severe Thunderstorm Warning	FGZ	Coconino	14 min
Jul 23, 12:14 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	31 min
Jul 23, 12:36 PM MST	Flash Flood Watch	FGZ	Apache, Coconino, Gila, Navajo, Yavapai	7 hr
Jul 23, 12:42 PM MST	Severe Thunderstorm Warning	FGZ	Apache	33 min
Jul 23, 1:11 PM MST	Flash Flood Warning	FGZ	Yavapai	79 min
Jul 23, 1:56 PM MST	Flash Flood Warning	FGZ	Gila	4 min
Jul 23, 1:57 PM MST	Flash Flood Warning	FGZ	Yavapai	2 hr
Jul 23, 2:18 PM MST	Flash Flood Warning	FGZ	Coconino	117 min
Jul 23, 2:44 PM MST	Severe Thunderstorm Warning	FGZ	Apache	31 min
Jul 23, 3:22 PM MST	Severe Thunderstorm Warning	FGZ	Apache	23 min
Jul 23, 3:52 PM MST	Severe Thunderstorm Warning	FGZ	Apache	23 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2007 Every severe thunderstorm warning in 2007

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.