Alert archive / Idaho / Special Weather Statements in 2010

Special Weather Statement, NWS Missoula, MT

August 6, 2010Clearwater County, Idaho

NWS Missoula, MT issued this special weather statement at Aug 6, 2010, 1:44 AM PDT for Clearwater County, Idaho. It was in force for 61 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 6, 2010, 1:44 AM PDT (08:44 UTC)
Expired: Aug 6, 2010, 2:45 AM PDT
In force: 61 min
Issued by: NWS Missoula, MT

County Clearwater County, ID

The radar

The Missoula radar (KMSX), 177 km from the middle of the area, began a volume at 08:46 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

Spokane, WA (KOTX), launched 00:00Z, 8.7 hours before the alert went out and 145 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: 336 J/kg
Mixed-layer CIN: -105 J/kg
Mixed-layer LCL: 2802 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 101 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Missoula, MT wrote its last area forecast discussion before this special weather statement went out at Aug 5, 1:16 PM PDT, 12 hours 28 minutes earlier.

Area forecast discussion, Aug 5, 1:16 PM PDT, 12 hours 28 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MISSOULA MT
216 PM MDT THU AUG 5 2010

.DISCUSSION...AN UPPER LEVEL TROUGH ORIENTED ALONG THE PACIFIC
NORTHWEST COAST WILL CONTINUE TO INFLUENCE WEATHER OVER THE
NORTHERN ROCKIES THROUGH TOMORROW. WEAK WAVES OF ENERGY AND
MOISTURE WILL PROPAGATE THROUGH THE FLOW EACH AFTERNOON AND
INTERACT WITH UNSTABLE ATMOSPHERIC CONDITIONS TO PRODUCE SHOWERS
AND THUNDERSTORMS. ONE SUCH WAVE IS CURRENTLY BEGINNING TO PRODUCE
CONVECTION ACROSS LEMHI COUNTY IN IDAHO. THUNDERSTORMS ARE
EXPECTED TO CONTINUE TO DEVELOP...GENERALLY ACROSS NORTH CENTRAL
IDAHO AND SOUTHWEST MONTANA THROUGH THE AFTERNOON. NORTHWEST
MONTANA WILL SEE A FEW ISOLATED SHOWERS AND THUNDERSTORMS DEVELOP
LATER THIS AFTERNOON BUT DO NOT EXPECT COVERAGE TO BE AS
WIDESPREAD DUE TO MORE STABLE CONDITIONS IN PLACE. THE MAIN THREAT WITH
THUNDERSTORMS TODAY WILL BE HEAVY RAIN...ALTHOUGH SMALL HAIL AND
GUSTY WINDS CAN NOT BE RULED OUT. CONVECTION WILL FALL APART
AROUND SUNSET TONIGHT...WITH EXCEPTION OF EXTREME NORTHWEST
MONTANA WHERE A REINFORCING WAVE OF ENERGY WILL ALLOW FOR THE
POTENTIAL OF CONTINUING SHOWERS AND ISOLATED THUNDERSTORMS.

A MORE PROMINENT WAVE OF ENERGY IS ANTICIPATED TOMORROW AFTERNOON.
WITH MORE FAVORABLE INSTABILITY AND MOISTURE IN PLACE...WIDESPREAD
CONVECTION IS EXPECTED TO DEVELOP ACROSS THE REGION. THE MAIN
FOCUS WILL REMAIN ACROSS SOUTHWEST MONTANA AND NORTH CENTRAL IDAHO
HOWEVER. WITH MORE FAVORABLE UPPER LEVEL DYNAMICS...THE POTENTIAL
FOR A FEW OF THESE THUNDERSTORMS TO BECOME SEVERE TOMORROW IS NOT
OUT OF THE QUESTION. HOWEVER...THE MAIN THREAT WILL CONTINUE TO BE
HEAVY RAIN...SMALL HAIL AND GUSTY WINDS.

SATURDAY THROUGH THURSDAY...AN UNSTABLE AND WARM ATMOSPHERE CONTINUES ON
SATURDAY AND SUNDAY WITH THE POTENTIAL OF AFTERNOON THUNDERSTORMS
CONTINUING. THE MOST FAVORED LOCATIONS WILL BE ACROSS LEMHI COUNTY
TOWARDS THE BUTTE AREA. THIS TREND WILL CONTINUE FOR MONDAY AND
TUESDAY. FORECAST MODELS HAVE COME INTO BETTER AGREEMENT FOR MID-
WEEK AFTER NUMEROUS DISCREPANCIES OVER THE PAST 24 HOURS. A TROUGH
MOVING ALONG THE CANADIAN BORDER ON WEDNESDAY WILL LIKELY BRING A
COOL DOWN WITH THE POTENTIAL OF MORE SHOWERS AND THUNDERSTORMS.

&&

.AVIATION...THE ATMOSPHERE HAS BEGUN TO DESTABILIZE THIS AFTERNOON ALLOWING
FOR SHOWER AND THUNDERSTORM FORMATION. CURRENTLY MOST OF THE CONVECTION
IS LOCATED ACROSS LEMHI COUNTY IN IDAHO...HOWEVER CONVECTION WILL CONTINUE
TO DEVELOP AND SPREAD INTO SOUTHWEST MONTANA AFTER 05/2200Z. THE AIRFIELDS
MOST LIKELY TO BE IMPACTED INCLUDE KBTM AND KSMN. THESE STORMS WILL
BE CAPABLE OF PRODUCING HEAVY RAINFALL...SMALL HAIL AND GUSTY WINDS.
STORMS ARE ANTICIPATED TO DIMINISH AFTER 06/0200Z.

&&

.MSO WATCHES/WARNINGS/ADVISORIES...
MT...NONE.
ID...NONE.
&&

SHORT TERM...PALLISTER
LONG TERM....LOEFFELBEIN
AVIATION...PALLISTER

In the hours before

Special weather statement, Aug 5, 8:23 PM PDT, 5 hours 21 minutes before

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Special weather statement, Aug 5, 9:00 PM PDT, 4 hours 44 minutes before

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Special weather statement, Aug 5, 9:24 PM PDT, 4 hours 20 minutes before

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Special weather statement, Aug 5, 10:05 PM PDT, 3 hours 39 minutes before

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Special weather statement, Aug 5, 10:25 PM PDT, 3 hours 19 minutes before

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Special weather statement, Aug 6, 1:44 AM PDT, 0 minutes before

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The office that day

Everything else NWS Missoula, MT issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 5, 5:00 PM PDT	Areal Flood Advisory	MSO	Deer Lodge	83 min
Aug 5, 5:07 PM PDT	Severe Thunderstorm Warning	MSO	Granite	38 min
Aug 5, 5:22 PM PDT	Flash Flood Warning	MSO	Granite	99 min
Aug 5, 6:26 PM PDT	Special Weather Statement	MSO	Powell	49 min
Aug 5, 6:28 PM PDT	Special Weather Statement	MSO	Missoula	47 min
Aug 5, 7:21 PM PDT	Special Weather Statement	MSO	Powell	39 min
Aug 5, 9:00 PM PDT	Special Weather Statement	MSO	Lake	45 min
Aug 5, 9:24 PM PDT	Special Weather Statement	MSO		51 min
Aug 5, 10:05 PM PDT	Special Weather Statement	MSO	Mineral	55 min
Aug 5, 10:25 PM PDT	Special Weather Statement	MSO	Lincoln	65 min
Aug 6, 6:43 AM PDT	Special Weather Statement	MSO	Lincoln	47 min
Aug 6, 12:59 PM PDT	Special Weather Statement	MSO	Lincoln	46 min
Aug 6, 1:09 PM PDT	Flash Flood Watch	MSO	Deer Lodge, Granite, Powell, Ravalli, Silver Bow	8 hr
Aug 6, 1:43 PM PDT	Special Weather Statement	MSO	Ravalli	47 min
Aug 6, 1:51 PM PDT	Severe Thunderstorm Warning	MSO	Granite, Ravalli	39 min
Aug 6, 1:53 PM PDT	Special Weather Statement	MSO	Lincoln	52 min
Aug 6, 2:48 PM PDT	Special Weather Statement	MSO	Lincoln	42 min
Aug 6, 2:49 PM PDT	Special Weather Statement	MSO	Ravalli	41 min
Aug 6, 3:09 PM PDT	Severe Thunderstorm Warning	MSO	Flathead	51 min
Aug 6, 3:36 PM PDT	Special Weather Statement	MSO	Silver Bow	39 min
Aug 6, 3:45 PM PDT	Special Weather Statement	MSO	Lincoln	60 min
Aug 6, 3:54 PM PDT	Special Weather Statement	MSO	Flathead	66 min
Aug 6, 4:20 PM PDT	Special Weather Statement	MSO	Ravalli	55 min
Aug 6, 4:33 PM PDT	Severe Thunderstorm Warning	MSO	Ravalli	30 min
Aug 5, 6:51 PM PDT	Severe Thunderstorm Warning	MSO	Idaho	39 min
Aug 5, 7:11 PM PDT	Flash Flood Warning	MSO	Idaho	61 min
Aug 5, 7:29 PM PDT	Severe Thunderstorm Warning	MSO	Idaho	51 min
Aug 5, 8:23 PM PDT	Special Weather Statement	MSO	Idaho	52 min
Aug 6, 2:41 AM PDT	Special Weather Statement	MSO	Clearwater	64 min
Aug 6, 3:09 PM PDT	Areal Flood Advisory	MSO	Lemhi	20 min
Aug 6, 3:22 PM PDT	Flash Flood Warning	MSO	Lemhi	98 min
Aug 6, 4:56 PM PDT	Flash Flood Warning	MSO	Lemhi	2 hr

Nearby

Special Weather Statements in Idaho, 2010 Every special weather statement in 2010

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.