Weak afternoon convection was able to generate a landspout near Davenport.
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The episode as NWS OTX wrote it up.
Weak afternoon convection was able to generate a landspout near Davenport.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Spokane, WA wrote its last area forecast discussion before the first event at Mar 26, 2:49 PM PST, 1 hour 56 minutes earlier.
Area Forecast Discussion National Weather Service Spokane WA 349 PM PDT Tue Mar 26 2024 .SYNOPSIS... Showery weather wanes this evening, with some patchy fog possible overnight. A wet system arrives Wednesday, with widespread precipitation. Precipitation becomes showery Thursday with the potential for afternoon thunderstorms. Showers will continue into Friday, with a warming and drying trend through the weekend into early next week. && .DISCUSSION... Tonight: Showery weather will continue this evening, before a brief lull until a wetter system moves in Wednesday. This afternoon and evening a stretching mid-level shortwave is crossing the region, interacting with some low-grade instability, resulting in widely scattered showers. Some isolated embedded thunderstorms have been noted, with some small hail/graupel reported. These will continue to impact the eastern third of WA and north ID, with few showers trailing back into the upper Columbia Basin and perhaps as far west as the Waterville Plateau. Some snow will also be found in the mountains, but accumulations are expected to be minor. Overall showers are expected to wane as the sunset sets and as a stabilizing ridge nudges in from the west ahead of the next system. Overnight looks mostly dry, with some patchy fog in the sheltered valleys over northern WA and over ID, as well as in more localized fashion in some of the Cascade valleys. Overnight lows will largely be in the 30s, with some 20s near the Cascade valleys and sheltered northern valley. Wednesday: an organized frontal wave moves into the region, with a good chance of rain and more mountain snow. The warm front pushes up to the Cascades in the morning. This will allow precipitation to expand over the Cascades and western basin in the morning. Chances approach eastern WA toward late morning to midday. However the better chances expand over the remainder of the CWA in the afternoon and evening as the occluding cold front pushes in. This frontal wave comes with PWATs around 0.45 to 0.65 inches (or 130-170% of normal) before drier air starts in later in the evening into the overnight. Look for expanding rain and mainly mountain snow Wednesday, starting near the Cascades in the morning and expanding through the region for the afternoon and evening. The heavier precipitation rates are expected in the later afternoon and evening. As the front pushes through look for some increase wind speed, particularly over the western Columbia Basin and around the Blue Mountains/Camas Prairie. Gusts around 15-30 mph are possible in these areas. Temperatures are expected to be held back below normal a little bit, due to wetter weather. However if the rain is slower to move in temperatures may be closer normal. * Rain amounts: Every location has a good chance of seeing measurable rain, i.e. at least 0.01”. The 24-hour probability of >=0.10 inches of rain (i.e. a wetting rain) is around 60-90% over a good portion of the our CWA, with 40-60% around the deeper Columbia Basin/Wenatchee area and near the Okanogan County/BC border and Bonners Ferry area. Areas around the mountain zones, particularly the higher terrain, and even some of the eastern Columbia Basin/Palouse could see see near a quarter inch. So this looks like a wet system. Hydrographs show some rises on rivers with this system, but nothing is projected to reach action level, much less flood stage. However there could be some ponding of water in poor drainage areas and typical urban areas and some minor rock/mudslides may be found. Confidence in any of that remains low. * Snow amounts: The snow that has the potential for impacts will be around the Cascade crest and over the north-central WA passes. The official forecast for Stevens Pass has about 2-4 inches of snow through Wednesday night and about 1-2 inches Thursday. Similar amounts are in the forecast around Sherman Pass. Meanwhile the Idaho Passes have about 1 inches or so. Many of this may fall during the daytime hours when road temperatures will not be as receptive to accumulating, which should lessen impacts. However still look at pass conditions before you travel. Thursday: the occluding front will be pushing east of the area by Thursday morning and an unstable upper trough will moving into the region. The parent low remains off the coast, but embedded shortwave pivot into the region and at least a couple eject through our region. (However as a whole the pattern is very littered with small scale vorticity maxima.) Overall this set-up will work with instability (700-500 mb lapse rates between 7.5-8.5 C/km and SBCAPE between 100-300 J/kg) to bring scattered showers and the threat of embedded thunderstorms. That means precipitation will not be as steady as the later Wednesday/Wednesday evening precipitation, but will still carry the potential for brief downpours, gusty winds, small hail/graupel and lightning. Coverage will be highest in the afternoon and around the eastern third of WA and ID. The lee of the Cascades and deeper Columbia Basin will see the lowest risk. Snow is still expected in the mountains and some may also mix into some of the higher valleys near the Cascades and northern WA in the morning. Accumulations look light with most areas seeing less than a inch. Winds will be breezy over more of the region, with gusts in the 15-30 mph range. Central WA and the upper Columbia Basin has the best chance of the stronger gusts. The threat of showers and the winds wanes through Thursday night, with the higher focus shifting to the windward mountains. Patchy fog is possible overnight. Highs are expected to be closer to normal, in the 50s. Lows Thursday night into Friday morning are expected to be in the 30s. /Solveig Friday through Tuesday: After bringing widespread precipitation to the region Wednesday and Thursday, the offshore low pressure system will move further down the coast toward California allowing for clearing and drying here in the Inland Northwest. Abundant moisture will linger near the surface for a couple of days following the widespread mid-week rainfall. This low-level moisture in combination with decreasing cloud cover will provide conditions conducive to fog formation particularly for the northern valleys and the Idaho Panhandle Thursday night into Friday morning and Friday night into Saturday morning. While most of the region will dry out following the low's departure, chances for showers will still hang around into the weekend along the Cascade Crest, extreme Eastern Washington, and the Idaho Panhandle. Instability isn't looking too impressive through the weekend timeframe, but isolated bursts of graupel won't be out of the question. Heading into next week a short-lived ridge will move in, eliminating any remaining chances for showers through the day on Monday. By Tuesday chances for showers will creep back over the Cascades and Idaho Panhandle as our next system approaches. Looking at temperatures, overnight lows will be near seasonal averages - 20s for the northern valleys, around 40 for the LC Valley, and 30s everywhere else. Afternoon highs will start out near normal in the 50s on Friday and will gradually increase through the forecast period, peaking in the mid 60s by Tuesday next week. Parts of the LC Valley and the deep Columbia Basin could climb into the low 70s. /Fewkes && .AVIATION... 00Z TAFS: Showers and isolated embedded -tsra will linger this afternoon/early evening, dissipating after about 02-03Z. Some brief heavy downpours and small hail, as well as some MVFR cigs are possible with these. High pressure briefly builds in overnight, with some risk for fog developing around GEG-SFF-COE. But confidence only leans toward vicinity or perhaps shallow fog at this time. The next system comes in Wednesday, with rain increasing from west to east through the day and bringing with it lowering cigs and possible reduced visibility in the steadier rain. MVFR conditions are projected with the rain. Expect mountain obscurations. FORECAST CONFIDENCE AND/OR ALTERNATE SCENARIOS: Moderate to high confidence in showers decreasing after 02-03Z. Low confidence in fog overnight at TAF sites. High confidence in rain spreading over the region Wednesday, moderate confidence in precise timing. Some snow may mix in early near EAT, but confidence is low. If precipitation arrives earlier in the GEG- SFF-COE area (before 16Z) some snow may also mix in there, but confidence is moderate to high that precipitation will not arrive until late morning to afternoon. ------------------------ Confidence descriptors: Low - Less than a 30 percent chance Moderate - 30 to 70 percent chance High - Greater than a 70 percent chance For additional probabilistic information for NWS Spokane airports, please refer to the Aviation Dashboard on our webpage: https://www.weather.gov/otx/avndashboard && .PRELIMINARY POINT TEMPS/POPS... Spokane 33 48 38 52 34 54 / 20 90 100 60 30 30 Coeur d'Alene 31 47 37 48 33 51 / 30 70 100 80 40 40 Pullman 32 47 37 50 34 52 / 30 70 100 80 40 40 Lewiston 36 55 41 56 38 57 / 20 50 90 70 30 20 Colville 29 46 34 51 31 51 / 30 90 100 70 40 40 Sandpoint 32 45 36 46 34 47 / 40 60 100 90 50 60 Kellogg 34 46 39 45 34 48 / 40 60 100 90 40 50 Moses Lake 34 50 35 58 35 59 / 10 80 40 10 10 10 Wenatchee 36 44 36 54 36 55 / 0 80 20 20 10 10 Omak 35 46 37 56 37 57 / 10 100 60 30 20 30 && .OTX WATCHES/WARNINGS/ADVISORIES... ID...None. WA...None. &&
The Spokane radar (KOTX), 46 km away, was scanning. The volume nearest the first event began at 00:43 UTC.
1 tornado. Local standard time, as filed.
Spotter confirmed visual evidence of condensation funnel connected to cloud base 2 miles Northwest of Davenport. Radar confirmed an outflow boundary in the area. No damage reported over open wheat country. Time and location estimated.
After NWS Directive 10-1605, the rules offices file Storm Data by.
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