Alert archive / Idaho / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 28, NWS Boise, ID

September 5, 20134 counties in Idaho

NWS Boise, ID issued this severe thunderstorm warning at Sep 5, 2013, 4:52 PM MDT for 4 counties in Idaho. It was in force for 38 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 5, 2013, 4:52 PM MDT (22:52 UTC)
Expired: Sep 5, 2013, 5:30 PM MDT
In force: 38 min
Issued by: NWS Boise, ID
Area: Storm-based polygon

Counties Adams County, ID, Gem County, ID, Valley County, ID, Washington County, ID

The radar

The Boise radar (KCBX), 117 km from the middle of the area, began a volume at 22:54 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Sep 5, 1:35 PM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Boise Airport, ID (KBOI), launched 12:00Z, 10.9 hours before the alert went out and 108 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: 97 J/kg
Mixed-layer CIN: -185 J/kg
Mixed-layer LCL: 1643 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 160 m²/s²
0-3 km storm-relative helicity: 70 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 Boise, ID wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 5, 2:39 PM MDT, 2 hours 13 minutes earlier.

Area forecast discussion, Sep 5, 2:39 PM MDT, 2 hours 13 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
239 PM MDT THU SEP 5 2013

.SHORT TERM...TONIGHT THROUGH SATURDAY...SEVERE WEATHER OPERATIONS
SO THIS WILL BE SHORT. UPPER LEVEL JET OVER OREGON BY EARLY
EVENING WILL BRING 60 KNOTS OF BULK LOW LEVEL SHEAR. MDCARS T/TD
SOUNDING NEAR 17Z MODIFIED FOR HIGH TEMPERATURE BROUGHT CAPE TO
1700 J/KG AND LI TO -6C ALONG WITH PW OF 1.3 INCHES. THIS WILL
SUPPORT SUPERCELLS SUCH AS THE ONE THE NWS BOISE WARNED FOR OVER
OWYHEE COUNTY AS OF 236 PM. A SEVERE THUNDERSTORM WATCH IS IN
EFFECT FOR SOUTHWEST IDAHO AND SOUTHEAST OREGON TIL 9 PM MDT/8PM
PDT. WITH THE HIGH PWAT AND ANY TRAINING STORMS THERE IS STILL A
FLASH FLOOD THREAT ESPECIALLY CENTRAL IDAHO SO THERE IS A FLASH
FLOOD WATCH IN EFFECT UNTIL 6 PM MDT/5 PM PDT. COOLER FRIDAY AND
SATURDAY WITH ISOLATED STORMS MAINLY ACROSS THE HIGHER NORTHERN
TERRAIN.

.LONG TERM...SATURDAY NIGHT THROUGH THURSDAY...GOOD MODEL AGREEMENT
WITH LARGE SCALE FEATURES THROUGH THE PERIOD. THE UPPER LOW CENTER
CURRENTLY NEAR THE OREGON COAST IS EXPECTED TO MOVE ACROSS NORTHERN
IDAHO SUNDAY. DRIER WESTERLY FLOW AND LOWER HEIGHTS WILL KEEP DAYTIME
HIGHS NEAR SEASONAL NORMALS SUNDAY AND MONDAY WITH DRY CONDITIONS
PREVAILING. AS THE LOW MOVES FURTHER EAST MONDAY AND TUESDAY A RIDGE
BUILDS OVER THE PACIFIC NORTHWEST WHICH WILL TREND TEMPERATURES UP
THROUGH THE MIDDLE OF THE WEEK...WITH DAYTIME HIGHS REACHING AROUND
90 DEGREES IN THE LOWER VALLEYS WEDNESDAY AND THURSDAY. MODELS DO
SHOW A WEAK CUTOFF LOW OVER SOUTHERN CALIFORNIA THE MIDDLE OF NEXT
WEEK WHILE THE RIDGE AXIS SHIFTS OVER THE ROCKIES. SOUTHERLY FLOW
BETWEEN THESE TWO FEATURES MAY BRING SOME MOISTURE BACK INTO THE
AREA BUT FOR NOW WILL KEEP THE FORECAST DRY.

&&

.AVIATION...NUMEROUS RAIN SHOWERS AND THUNDERSTORMS THROUGH 06Z
TONIGHT WITH GRADUAL IMPROVEMENT AFTERWARD FROM SOUTH TO NORTH. MVFR TO
IFR CONDITIONS WITH HEAVY RAIN AND POSSIBLE HAIL WITH THUNDERSTORMS.
SURFACE WINDS GENERALLY SOUTHEAST 5-10KTS EXCEPT ERRATIC AND GUSTY
UP TO 40KTS IN THE VICINITY OF THUNDERSTORMS. A COLD FRONT WILL MOVE
THROUGH OVERNIGHT...AROUND 05Z AT KBKE...AND 08Z AT KBOI...AND 10Z
AT KTWF. SURFACE WINDS WEST 10-20KTS BEHIND THE FRONT. SOUTHWEST
WINDS 20-30KTS AT 10K FT MSL THROUGH TONIGHT DECREASING FRIDAY.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...FLASH FLOOD WATCH UNTIL 6 PM MDT THIS EVENING IDZ011>016-028>030-
     033.
OR...FLASH FLOOD WATCH UNTIL 6 PM MDT /5 PM PDT/ THIS EVENING
     ORZ061>064.
&&

WEATHER.GOV/BOISE

SHORT TERM...VM
LONG TERM....TL/WH
AVIATION.....TL

Hazardous weather outlook, Sep 5, 2:38 PM MDT, 2 hours 14 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BOISE ID
238 PM MDT THU SEP 5 2013

IDZ011>016-028>030-033-ORZ061>064-062045-
WEST CENTRAL MOUNTAINS-LOWER TREASURE VALLEY ID-BOISE MOUNTAINS-
UPPER TREASURE VALLEY-SOUTHWEST HIGHLANDS-WESTERN MAGIC VALLEY-
CAMAS PRAIRIE-OWYHEE MOUNTAINS-SOUTHERN TWIN FALLS COUNTY-
UPPER WEISER RIVER-HARNEY COUNTY-BAKER COUNTY-MALHEUR COUNTY-
LOWER TREASURE VALLEY OR-
238 PM MDT THU SEP 5 2013 /138 PM PDT THU SEP 5 2013/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTH CENTRAL
IDAHO...SOUTHWEST IDAHO...WEST CENTRAL IDAHO...NORTHEAST OREGON
AND SOUTHEAST OREGON.

.DAY ONE...THIS AFTERNOON AND TONIGHT

A FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH THIS AFTERNOON. SEE
THE LATEST FLASH FLOOD WATCH PRODUCT...BOIFFABOI...FOR DETAILS. IN
ADDITION TO THE FLASH FLOOD THREAT...A SEVERE THUNDERSTORM WATCH
IS IN EFFECT UNTIL 9 PM MDT/ 8 PM PDT THIS EVENING.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE ASKED TO REPORT ANY SIGNIFICANT WEATHER THROUGH
ESTABLISHED PROCEDURES.

In the hours before

Local storm report, Sep 5, 4:07 PM MDT, 45 minutes before

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Local storm report, Sep 5, 4:23 PM MDT, 29 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BOISE ID
423 PM MDT THU SEP 05 2013

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

0422 PM     HAIL             1 N EAGLE               43.71N 116.36W
09/05/2013  M1.25 INCH       ADA                ID   UNKNOWN

            HALF DOLLAR HAIL AND 45 MPH WINDS.

&&

TWB

Local storm report, Sep 5, 4:26 PM MDT, 26 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BOISE ID
426 PM MDT THU SEP 05 2013

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

0426 PM     HAIL             5 N EAGLE               43.77N 116.36W
09/05/2013  E1.50 INCH       ADA                ID   UNKNOWN

            PING PONG BALL SIZE HAIL ON HIGHWAY 55 NORTH OF EAGLE.

&&

TWB

Local storm report, Sep 5, 4:43 PM MDT, 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BOISE ID
443 PM MDT THU SEP 05 2013

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

0226 PM     HAIL             JORDAN VALLEY           42.98N 117.05W
09/05/2013  E1.75 INCH       MALHEUR            OR   UNKNOWN

            ESTIMATED GOLF BALL SIZE HAIL FROM PHOTO.

&&

TWB

Local storm report, Sep 5, 4:46 PM MDT, 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BOISE ID
446 PM MDT THU SEP 05 2013

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

0341 PM     HAIL             1 S HORSESHOE BEND      43.90N 116.19W
09/05/2013  M1.00 INCH       BOISE              ID   UNKNOWN

            SPOTTER REPORTS THUNDERSTORM WITH 1 INCH HAIL AND WIND
            GUSTS TO 60 MPH.

&&

WHEWKO

Local storm report, Sep 5, 4:48 PM MDT, 4 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BOISE ID
448 PM MDT THU SEP 05 2013

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

0345 PM     HAIL             MERIDIAN                43.61N 116.40W
09/05/2013  E1.50 INCH       ADA                ID   UNKNOWN

            HAIL GREATER THAN 1 INCH. HALF SIZE OF SMALL YOYO.

&&

TWB

The office that day

Everything else NWS Boise, ID issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 4, 6:05 PM MDT	Flash Flood Warning	BOI	Gooding, Jerome, Twin Falls	85 min
Sep 4, 6:17 PM MDT	Special Weather Statement	BOI	Ada	43 min
Sep 4, 6:18 PM MDT	Severe Thunderstorm Warning	BOI	Gooding, Jerome, Twin Falls	57 min
Sep 4, 7:03 PM MDT	Flash Flood Warning	BOI	Ada, Canyon, Owyhee	117 min
Sep 4, 9:38 PM MDT	Flash Flood Warning	BOI	Camas	112 min
Sep 5, 1:08 AM MDT	Special Weather Statement	BOI	Adams, Gem, Payette, Washington	52 min
Sep 5, 6:12 AM MDT	Special Weather Statement	BOI		63 min
Sep 5, 8:08 AM MDT	Special Weather Statement	BOI	Washington	52 min
Sep 5, 1:07 PM MDT	Special Weather Statement	BOI		53 min
Sep 5, 2:02 PM MDT	Severe Thunderstorm Warning	BOI	Canyon, Owyhee	43 min
Sep 5, 2:45 PM MDT	Severe Thunderstorm Warning	BOI	Ada, Canyon, Owyhee	60 min
Sep 5, 3:12 PM MDT	Flash Flood Warning	BOI	Camas	2 hr
Sep 5, 3:41 PM MDT	Flash Flood Warning	BOI	Owyhee	94 min
Sep 5, 3:43 PM MDT	Severe Thunderstorm Warning	BOI	Ada, Canyon, Owyhee	62 min
Sep 5, 3:59 PM MDT	Areal Flood Advisory	BOI	Ada, Canyon	3 hr
Sep 5, 4:11 PM MDT	Severe Thunderstorm Warning	BOI	Boise, Gem, Payette, Valley, Washington	64 min
Sep 5, 4:44 PM MDT	Severe Thunderstorm Warning	BOI	Jerome, Twin Falls	46 min
Sep 5, 4:55 PM MDT	Flash Flood Warning	BOI	Adams, Boise, Gem, Valley, Washington	50 min
Sep 5, 5:05 PM MDT	Severe Thunderstorm Warning	BOI	Elmore, Gooding, Owyhee, Twin Falls	40 min
Sep 5, 5:10 PM MDT	Severe Thunderstorm Warning	BOI	Boise, Valley	35 min
Sep 5, 5:23 PM MDT	Severe Thunderstorm Warning	BOI	Jerome, Twin Falls	37 min
Sep 5, 5:27 PM MDT	Severe Thunderstorm Warning	BOI	Adams, Valley	48 min
Sep 5, 5:55 PM MDT	Severe Thunderstorm Warning	BOI	Jerome, Twin Falls	50 min
Sep 5, 5:59 PM MDT	Areal Flood Advisory	BOI	Jerome, Twin Falls	3 hr
Sep 4, 11:06 PM MDT	Areal Flood Warning	BOI	Harney, Malheur	6 hr

Nearby

Severe Thunderstorm Warnings in Idaho, 2013 Every severe thunderstorm warning in 2013

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.