Alert archive / Arizona / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 20, NWS Flagstaff, AZ

August 18, 2014Coconino County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Aug 18, 2014, 3:30 PM MST for Coconino County, Arizona. It was in force for 45 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: Aug 18, 2014, 3:30 PM MST (22:30 UTC)
Expired: Aug 18, 2014, 4:15 PM MST
In force: 45 min
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon

County Coconino County, AZ

The radar

The Flagstaff radar (KFSX), 150 km from the middle of the area, began a volume at 22:30 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, 10.5 hours before the alert went out and 68 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: 630 J/kg
Mixed-layer CIN: -105 J/kg
Mixed-layer LCL: 1371 m above ground
0-6 km bulk shear: 2 kt
0-1 km storm-relative helicity: -12 m²/s²
0-3 km storm-relative helicity: 148 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 Aug 18, 9:35 AM MST, 5 hours 55 minutes earlier.

Area forecast discussion, Aug 18, 9:35 AM MST, 5 hours 55 minutes before

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Hazardous weather outlook, Aug 18, 3:33 AM MST, 11 hours 57 minutes before

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In the hours before

Local storm report, Aug 18, 12:31 PM MST, 2 hours 59 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
1231 PM MST MON AUG 18 2014

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

0200 PM     FUNNEL CLOUD     5 NE KYKOTSMOVI VILLAGE 35.93N 110.56W
08/13/2014                   NAVAJO             AZ   PUBLIC

            A FUNNEL CLOUD WAS SEEN ABOUT 5 MILES NORTHEAST OF
            KYKOTSMOVI.

&&

EVENT NUMBER FGZ1400066

MAS

Special weather statement, Aug 18, 12:48 PM MST, 2 hours 42 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
1248 PM MST MON AUG 18 2014

AZZ015-182030-
COCONINO AZ-
1248 PM MST MON AUG 18 2014

THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A

SIGNIFICANT WEATHER ADVISORY FOR...
  CENTRAL COCONINO COUNTY IN NORTH CENTRAL ARIZONA

UNTIL 130 PM MST

AT 1243 PM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
STRONG THUNDERSTORM NEAR BADERVILLE...NEAR HIGHWAY 180 AND SNOWBOWL
ROAD. THIS STORM WAS NEARLY STATIONARY.

HAIL UP TO THE SIZE OF NICKELS IS EXPECTED WITH THIS STORM...ALONG
WITH HEAVY RAIN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE ADVISORY AREA AND STORMS APPROACH...TAKE SHELTER IN
A STURDY BUILDING.

IN ADDITION...VERY HEAVY RAINFALL MAY CAUSE TEMPORARY PONDING ON SOME
ROADS AND MINOR FLOODING OF POOR DRAINAGE AREAS. IN HEAVY RAINFALL
SLOW DOWN TO REDUCE THE RISK OF HYDROPLANING...AND LEAVE A SAFE
DISTANCE BETWEEN YOURSELF AND OTHER VEHICLES.

&&

LAT...LON 3538 11194 3548 11169 3526 11163 3522 11177
TIME...MOT...LOC 1947Z 180DEG 0KT 3529 11153

MAS

Special weather statement, Aug 18, 1:23 PM MST, 2 hours 7 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
123 PM MST MON AUG 18 2014

AZZ015-182100-
COCONINO AZ-
123 PM MST MON AUG 18 2014

THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A

SIGNIFICANT WEATHER ADVISORY FOR...
  CENTRAL COCONINO COUNTY IN NORTH CENTRAL ARIZONA

UNTIL 200 PM MST

AT 120 PM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED
STRONG THUNDERSTORMS OVER THE SAN FRANSISCO PEAKS AND NEAR ROGERS
LAKE...MOVING NORTHWEST AT 5 MPH.

HAIL UP TO ONE-HALF INCH IN DIAMETER IS EXPECTED WITH THIS STORM...
ALONG WITH HEAVY RAIN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE ADVISORY AREA AND STORMS APPROACH...TAKE SHELTER IN
A STURDY BUILDING.

IN ADDITION...VERY HEAVY RAINFALL MAY CAUSE TEMPORARY PONDING ON SOME
ROADS AND MINOR FLOODING OF POOR DRAINAGE AREAS. IN HEAVY RAINFALL
SLOW DOWN TO REDUCE THE RISK OF HYDROPLANING...AND LEAVE A SAFE
DISTANCE BETWEEN YOURSELF AND OTHER VEHICLES.

&&

LAT...LON 3531 11198 3549 11167 3525 11156 3505 11181
TIME...MOT...LOC 2021Z 174DEG 8KT 3528 11154

MAS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 17, 5:09 PM MST	Special Weather Statement	FGZ		21 min
Aug 17, 5:29 PM MST	Special Weather Statement	FGZ		31 min
Aug 17, 5:53 PM MST	Special Weather Statement	FGZ		22 min
Aug 17, 6:05 PM MST	Areal Flood Advisory	FGZ	Gila	115 min
Aug 18, 12:48 PM MST	Special Weather Statement	FGZ	Coconino	42 min
Aug 18, 1:23 PM MST	Special Weather Statement	FGZ		37 min
Aug 18, 2:06 PM MST	Areal Flood Advisory	FGZ	Coconino	3 hr
Aug 18, 4:01 PM MST	Special Weather Statement	FGZ		29 min
Aug 18, 4:06 PM MST	Special Weather Statement	FGZ	Yavapai	39 min
Aug 18, 4:22 PM MST	Areal Flood Advisory	FGZ	Yavapai	113 min
Aug 18, 4:31 PM MST	Areal Flood Advisory	FGZ	Yavapai	89 min
Aug 18, 4:59 PM MST	Special Weather Statement	FGZ	Yavapai	46 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2014 Every severe thunderstorm warning in 2014

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.