Alert archive / Idaho / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 18, NWS Pocatello, ID

May 31, 20155 counties in Idaho

NWS Pocatello, ID issued this severe thunderstorm warning at May 31, 2015, 9:39 PM MDT for 5 counties in Idaho. It was in force for 36 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: May 31, 2015, 9:39 PM MDT (03:39 UTC)
Expired: May 31, 2015, 10:15 PM MDT
In force: 36 min
Issued by: NWS Pocatello, ID
Area: Storm-based polygon

Counties Bonneville County, ID, Fremont County, ID, Jefferson County, ID, Madison County, ID, Teton County, ID

The radar

The Pocatello radar (KSFX), 113 km from the middle of the area, began a volume at 03:42 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

Boise Airport, ID (KBOI), launched 00:00Z, 3.7 hours before the alert went out and 366 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: 82 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 3548 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 27 m²/s²
0-3 km storm-relative helicity: 76 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 Pocatello, ID wrote its last area forecast discussion before this severe thunderstorm warning went out at May 31, 1:59 PM MDT, 7 hours 40 minutes earlier.

Area forecast discussion, May 31, 1:59 PM MDT, 7 hours 40 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE POCATELLO ID
159 PM MDT SUN MAY 31 2015

.SHORT TERM...TONIGHT THROUGH TUESDAY NIGHT. ACTIVE PATTERN NEXT
FEW DAYS WITH MARGINAL RISK OF SEVERE THIS EVENING AND AGAIN
MONDAY. UPPER LOW OFF CALIFORNIA COAST ADVANCING INTO THE REGION
WITH SHORTWAVE LIFTING THROUGH OREGON TODAY. MIX OF INSTABILITY
AND SHEAR ACROSS THE REGION. LATEST RAP AND HRRR DELAY CONVECTIVE
INITIATION UNTIL LATER THIS AFTERNOON...BOTH FAVORING SOUTH
CENTRAL HIGHLANDS AND AREAS ALONG/NEAR THE DIVIDE. MORE WIDESPREAD
CONVECTION OCCURS OVERNIGHT MAINLY MAGIC VALLEY SPREADING NORTH
INTO CENTRAL MTNS AS SFC LOW ADVECTS NORTH INTO EAST IDAHO.
HRRR/RAP FURTHER EAST WITH SFC LOW THAN GFS/NAM. STRONG SOUTHERLY
WINDS EAST OF LOW SPREADING INTO SOUTHEAST CORNER AND HAVE NUDGED
FORECAST WINDS UP SLIGHTLY IN THIS REGION. SHORTWAVE LIFTS THROUGH
EAST IDAHO ON MONDAY WITH ANOTHER POTENTIAL FOR STRONG TO
MARGINALLY SEVERE STORMS AHEAD OF SHORTWAVE AXIS. FOCUS SHOULD BE
OVER CENTRAL MTNS AND THEN SHIFTING NORTHEAST ACROSS THE DIVIDE
THROUGH THE EVENING. SECONDARY BAND OF CONVECTION ALSO POSSIBLE
ALONG SOUTHERN HIGHLANDS AHEAD OF SFC COLD FRONT MONDAY EVENING
THROUGH TUESDAY NIGHT. HAVE PUSHED POPS HIGHER IN THIS REGION WITH
GOOD AGREEMENT BETWEEN NAM/GFS. COOLER AIR MASS IN PLACE FOR
TUESDAY BUT STILL UNSETTLED. BOTH NAM/GFS SWING BROAD AREA OF
PRECIP ACROSS CENTRAL MTNS INTO DIVIDE REGION TUE AFTERNOON
THROUGH OVERNIGHT. GUIDANCE FAVORS GOOD PRESSURE GRADIENT ACROSS
SNAKE PLAIN WITH NAM MUCH STRONGER THAN GFS IN RESULTING WINDS.
POTENTIAL EXISTS FOR LAKE WIND ADVISORY BUT WOULD LIKE TO SEE
BETTER CONSENSUS FROM MODELS. DMH

.LONG TERM...WEDNESDAY THROUGH NEXT SATURDAY. MODELS COMING IN
BETTER AGREEMENT WITH REGARD TO DEEPENING TROUGH OVER THE WEST WITH
A CUTOFF LOW DEVELOPING OVER THE CALIFORNIA COAST THURSDAY.
SOUTHWEST FLOW ALOFT WILL GRADUALLY BECOME MORE SOUTHERLY AS THE LOW
DEVELOPS WITH INCREASING MOISTURE TRANSPORT. MODELS BEGIN TAPPING
SIGNIFICANT MOISTURE FROM HURRICANE ANDRES AND ADVANCING IT INTO OUR
SOUTHEASTERN HIGHLANDS FRIDAY. KEEPING AFTERNOON CONVECTIVE POPS
THROUGH THE PERIOD...ESPECIALLY OVER THE CENTRAL MOUNTAINS. WENT
WITH SLIGHTLY HIGHER DAYTIME POPS FRIDAY THROUGH SUNDAY WITH
INFLUENCE OF INCREASED MOISTURE TRANSPORT AHEAD OF UPPER LOW.
HINSBERGER

&&

.AVIATION...WEAK UPPER DISTURBANCE ADVANCING INTO IDAHO THIS
AFTERNOON WHICH COULD TRIGGER THUNDERSTORMS THROUGH THE EVENING AS
LAPSE RATES INCREASE. ANOTHER ROUND OF STRONG OUTFLOW WINDS ARE
AGAIN POSSIBLE. HEADING INTO THE EVENING HOURS...A WARM FRONT WILL
LIFT NORTHWARD ACROSS THE AREA TONIGHT KEEPING SHOWERS/THUNDER
CHANCES ELEVATED ACROSS THE CENTRAL MOUNTAINS OVERNIGHT. HINSBERGER

&&

.PIH WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

In the hours before

Special weather statement, May 31, 7:30 PM MDT, 2 hours 9 minutes before

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Special weather statement, May 31, 7:31 PM MDT, 2 hours 8 minutes before

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Special weather statement, May 31, 7:59 PM MDT, 1 hour 40 minutes before

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Special weather statement, May 31, 8:38 PM MDT, 1 hour 1 minute before

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Local storm report, May 31, 8:57 PM MDT, 42 minutes before

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Local storm report, May 31, 9:26 PM MDT, 13 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 31, 6:08 PM MDT	Severe Thunderstorm Warning	PIH	Blaine, Cassia, Minidoka, Power	37 min
May 31, 6:46 PM MDT	Severe Thunderstorm Warning	PIH	Bannock, Bingham, Power	44 min
May 31, 6:50 PM MDT	Special Weather Statement	PIH	Fremont	40 min
May 31, 7:30 PM MDT	Special Weather Statement	PIH	Fremont	30 min
May 31, 7:31 PM MDT	Special Weather Statement	PIH	Bannock, Bingham, Power	44 min
May 31, 7:59 PM MDT	Special Weather Statement	PIH	Butte, Jefferson	46 min
May 31, 8:38 PM MDT	Special Weather Statement	PIH	Bingham, Bonneville, Butte, Jefferson, Madison	37 min
May 31, 9:04 PM MDT	Severe Thunderstorm Warning	PIH	Bingham, Bonneville, Fremont, Jefferson, Madison, Teton	41 min
May 31, 10:11 PM MDT	Severe Thunderstorm Warning	PIH	Bonneville, Fremont, Jefferson, Madison, Teton	34 min
Jun 1, 4:25 AM MDT	Special Weather Statement	PIH	Custer	80 min
Jun 1, 5:08 AM MDT	Special Weather Statement	PIH	Blaine	82 min
Jun 1, 10:23 AM MDT	Special Weather Statement	PIH	Custer	67 min
Jun 1, 12:57 PM MDT	Special Weather Statement	PIH	Butte	63 min
Jun 1, 1:32 PM MDT	Severe Thunderstorm Warning	PIH	Butte, Custer	33 min
Jun 1, 1:56 PM MDT	Severe Thunderstorm Warning	PIH	Blaine, Cassia, Power	49 min
Jun 1, 2:23 PM MDT	Severe Thunderstorm Warning	PIH	Bingham, Blaine, Butte, Jefferson	52 min
Jun 1, 2:31 PM MDT	Severe Thunderstorm Warning	PIH	Butte, Clark	29 min
Jun 1, 3:03 PM MDT	Special Weather Statement	PIH	Cassia	42 min
Jun 1, 3:05 PM MDT	Severe Thunderstorm Warning	PIH	Cassia	40 min
Jun 1, 3:14 PM MDT	Special Weather Statement	PIH	Butte	2 hr
Jun 1, 3:21 PM MDT	Severe Thunderstorm Warning	PIH	Bannock, Power	39 min
Jun 1, 3:48 PM MDT	Special Weather Statement	PIH	Power	57 min
Jun 1, 3:50 PM MDT	Severe Thunderstorm Warning	PIH	Bannock, Bingham, Power	40 min
Jun 1, 3:58 PM MDT	Severe Thunderstorm Warning	PIH	Bannock, Bingham, Bonneville, Caribou	47 min
Jun 1, 4:10 PM MDT	Severe Thunderstorm Warning	PIH	Bingham, Bonneville	37 min
Jun 1, 4:35 PM MDT	Severe Thunderstorm Warning	PIH	Bannock, Franklin, Oneida	40 min
Jun 1, 4:39 PM MDT	Severe Thunderstorm Warning	PIH	Bannock, Bingham, Bonneville, Jefferson, Madison	35 min
Jun 1, 5:13 PM MDT	Severe Thunderstorm Warning	PIH	Bannock, Bear Lake, Caribou, Franklin, Oneida	35 min
Jun 1, 5:13 PM MDT	Severe Thunderstorm Warning	PIH	Bonneville, Fremont, Madison, Teton	47 min
Jun 1, 5:46 PM MDT	Severe Thunderstorm Warning	PIH	Fremont	24 min
Jun 1, 5:47 PM MDT	Severe Thunderstorm Warning	PIH	Bear Lake, Caribou, Franklin	43 min

Nearby

Severe Thunderstorm Warnings in Idaho, 2015 Every severe thunderstorm warning in 2015

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.