Alert archive / Idaho / Flash Flood Watches in 2016

Flash Flood Watch 5, NWS Boise, ID

July 10, 20167 counties in Idaho

NWS Boise, ID issued this flash flood watch at Jul 10, 2016, 9:46 AM MDT for 7 counties in Idaho. It took effect at Jul 10, 2016, 11:00 AM MDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued
Jul 10, 2016, 9:46 AM MDT (15:46 UTC)
In effect from
Jul 10, 2016, 11:00 AM MDT
Expired
Jul 10, 2016, 7:09 PM MDT
In force
8 hr
Issued by
NWS Boise, ID
Flood severity
None

Counties Adams County, ID, Boise County, ID, Camas County, ID, Elmore County, ID, Gem County, ID, Valley County, ID, Washington County, ID

The radar

The Boise radar (KCBX), 77 km from the middle of the area, began a volume at 15:51 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

Boise Airport, ID (KBOI), launched 12:00Z, 3.8 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-pSkew-T log-p diagram, Boise Airport, ID at 12:00Z on 2016-07-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 12 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Boise Airport, ID at 12:00Z on 2016-07-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -58 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
12 J/kg
Mixed-layer CIN
-269 J/kg
Mixed-layer LCL
1213 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
-58 m²/s²
0-3 km storm-relative helicity
116 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 flash flood watch 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 flash flood watch went out at Jul 10, 8:38 AM MDT, 1 hour 8 minutes earlier.

Area forecast discussion, Jul 10, 8:38 AM MDT, 1 hour 8 minutes before
Area Forecast Discussion
National Weather Service Boise ID
838 AM MDT SUN JUL 10 2016

.DISCUSSION...Cold front with showers and thunderstorms moving
northeast across western Idaho this morning.  We updated to increase
thunderstorm coverage today ahead (east) of the front. Thunderstorms
along the front have had wind gusts to 40 mph and heavy rain.  One
report of dime-sized hail at a wildfire site in the Boise Mountains
out ahead of the front.  Pea-sized hail was reported at Emmett, ID.
Heavy rain fell around sunrise on the Soda Fire Burn Scar in sw
Owyhee County and prompted issuance of a flash flood warning there.
As of 0800 MDT the front and heavy rain have now moved well east of
that burn scar.  Breezy and very cool weather still expected in all
areas this afternoon.  Showers and thunderstorms will be most
prevalent in Idaho mountain zones, especially the eastern-most
zones. Scattered showers and isolated thunderstorms elsewhere
through the day as upper low moves through. Showers and winds
decreasing this evening.

&&

.AVIATION...Mostly VFR except for MVFR conditions with scattered
showers and thunderstorms through this evening. Expect gusty winds,
heavy rain and small hail with the stronger storms. Surface
winds...northwest 10-15 kts increasing to 15 to 25 kts with gusts up
to 35 kts. Winds aloft through 10 kft MSL, west 20-30 kts.

&&

.PREV DISCUSSION...
SHORT TERM...Today through Tuesday night...An unseasonably cool
upper level trough is now moving inland along the WA/OR coast this
morning. The upper level trough will move across Oregon today and
into central Idaho by this afternoon and Montana by early Monday
morning. Showers will become widespread across the area this
morning with isolated thunderstorms. Showers will produce brief
heavy rain and recent burn scars will need to be monitored for
flood concerns today. High temperatures today will be near record
lows for the date: Boise is forecast at 67F and this would tie a
record low max for the date, see Public Information Statement for
other locations. Boise has not recorded a max temperature below
70F in July since 2001, and one below 65F since 1986. Temperatures
will be 20-25 degrees below the seasonal average for most of the
region with breezy conditions expected today. Snow levels will
briefly lower to around 7,500 to 8,000 feet MSL as the center of
the trough passes by. Precipitation will taper off after sunset as
the upper level trough quickly transitions into Montana by Monday
morning. Monday morning will be quite cool for July and patchy
fog will occur in the sheltered valleys near Baker City, Burns,
and the central Idaho mountain valleys. Weak ridging will build
into the area on Monday, with mostly sunny skies and light winds.
A shortwave off the Pacific Northwest coast moves across the
region on Tuesday with isolated showers and thunderstorms
developing across northeast Oregon and the central Idaho mountains
during the afternoon.

LONG TERM...Wednesday through Sunday. A mostly zonal dry flow will
be present Wednesday and Thursday with temperatures near normal. By
Friday, models are in good agreement of another upper low slowly
moving inland and moving east over northern Washington and remaining
near there through Sunday.  At this point, the bulk of any
precipitation looks to stay to our north.  However, breezy
conditions are likely during this time, with temperatures remaining
near normal.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...None.
OR...None.

&&

www.weather.gov/Boise
www.facebook.com/NWSBoise
www.twitter.com/NWSBoise

DISCUSSION...LC
AVIATION.....JDS
PREV SHORT TERM...KA
PREV LONG TERM....EP

In the hours before

Special weather statement, Jul 10, 6:06 AM MDT, 3 hours 40 minutes before
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Special weather statement, Jul 10, 6:52 AM MDT, 2 hours 54 minutes before
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Special weather statement, Jul 10, 7:07 AM MDT, 2 hours 39 minutes before
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Local storm report, Jul 10, 8:25 AM MDT, 1 hour 21 minutes before
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Local storm report, Jul 10, 9:28 AM MDT, 18 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BOISE ID
928 AM MDT SUN JUL 10 2016

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

0903 AM     HEAVY RAIN       LOWMAN                  44.07N 115.61W
07/10/2016  M0.25 INCH       BOISE              ID   TRAINED SPOTTER

            QUARTER INCH OF RAIN IN 15 MINUTES.

0925 AM     HEAVY RAIN       1 W BOARD CORRAL MOUNTA 43.52N 117.24W
07/10/2016  M0.95 INCH       MALHEUR            OR   MESONET

            OWYHEE RIDGE RAWS LAST 6 HOURS.

&&

JSMITH

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 10, 1:18 AM MDTSpecial Weather StatementBOIAdams27 min
Jul 10, 5:16 AM MDTSpecial Weather StatementBOIGem44 min
Jul 10, 5:18 AM MDTSpecial Weather StatementBOIValley42 min
Jul 10, 5:55 AM MDTSpecial Weather StatementBOICanyon20 min
Jul 10, 5:59 AM MDTSpecial Weather StatementBOIBoise31 min
Jul 10, 6:06 AM MDTSpecial Weather StatementBOIValley39 min
Jul 10, 6:08 AM MDTFlash Flood WarningBOIOwyhee3 hr
Jul 10, 6:30 AM MDTSpecial Weather StatementBOIBoise45 min
Jul 10, 6:52 AM MDTSpecial Weather StatementBOIAda, Canyon38 min
Jul 10, 7:07 AM MDTSpecial Weather StatementBOIBoise38 min
Jul 10, 10:48 AM MDTFlash Flood WarningBOIBoise, Valley2 hr
Jul 10, 12:59 PM MDTFlash Flood WarningBOIOwyhee3 hr
Jul 10, 5:47 PM MDTSpecial Weather StatementBOIJerome28 min
Jul 9, 7:05 PM MDTSpecial Weather StatementBOIBaker25 min
Jul 10, 5:17 AM MDTSpecial Weather StatementBOIMalheur43 min

Nearby

Flash Flood Watches in Idaho, 2016Every flash flood watch in 2016

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.