The illusion of Storm Based Warnings. Daryl Herzmann Iowa State University
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1 The illusion of Storm Based Warnings Daryl Herzmann Iowa State University
2 Don t agree with something you see? Do what this guy did! I ll act indignant and ignore you.
3 Why am I so bitter? 1. Old Age 2. The calendar says 2011, our NWS is stuck in 1970s technology (ASCII Text) 3. Too many warnings are issued. Do you know how many?
4 Total Area [x CONUS] Total Number of Warnings NWS County SVR/TOR Warnings Storm Based Warnings Total Size Count 25 80, NEXRAD 70,000 60,000 50,000 40,000 30, ,000 10,
5 1 Oct 2007, warnings changed Storm-Based Warnings show the specific meteorological or hydrological threat area and are not restricted to geopolitical boundaries.
6 Warning Process Evaluation Garden Variety Tornado We had better warn.
7 Warning Process Evaluation Yippee, we can use our fine education and draw a polygon!
8 Warning Process Evaluation I draw my fancy pants polygon out for 30 minutes. I m done, right?
9 daryl s here Warning Process Evaluation Gasp, I m warning for 5 counties! Sirens will go off In all 5!
10 daryl s stays asleep Warning Process Evaluation WarnGen clipping to the rescue!
11 Warning Process Evaluation Whoa, what happened?
12 These aren t the polygons you re looking for (Maryland == 26,000 sq km)
13 Ye ole text product You can t read this, nor can the public! 291 WUUS53 KDMX SVRDMX IAC /O.NEW.KDMX.SV.W T2302Z T2345Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE DES MOINES IA 602 PM CDT FRI JUN THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHWESTERN APPANOOSE COUNTY IN SOUTH CENTRAL IOWA... NORTHEASTERN LUCAS COUNTY IN SOUTH CENTRAL IOWA... SOUTHWESTERN MARION COUNTY IN SOUTH CENTRAL IOWA... MONROE COUNTY IN SOUTH CENTRAL IOWA... SOUTHEASTERN WARREN COUNTY IN SOUTH CENTRAL IOWA... * UNTIL 645 PM CDT PRECAUTIONARY/PREPAREDNESS ACTIONS... MOVE TO AN INTERIOR ROOM AND STAY AWAY FROM WINDOWS. IF YOU ARE IN A MOBILE HOME...GET OUT NOW...AND SEEK SHELTER IN A REINFORCED BUILDING. A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO WARNING. IF A TORNADO IS SPOTTED...IMMEDIATELY MOVE TO THE BASEMENT OR SMALL INTERIOR ROOM OF A REINFORCED BUILDING. TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS. TURN AROND DON'T DROWN. * AT 600 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR && INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL LAT...LON SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED 10 TIME...MOT...LOC 2302Z 300DEG 28KT MILES NORTHEAST OF CHARITON...OR 36 MILES SOUTHEAST OF WIND...HAIL 60MPH 1.75IN DES MOINES...AND MOVING SOUTHEAST AT 30 MPH. $$ * LOCATIONS IMPACTED INCLUDE... ALBIA...RUSSELL...MELROSE AND LOVILIA. SMALL
14 Confusion UGC Code says we have 5 full counties IAC /O.NEW.KDMX.SV.W T2302Z T2345Z/ The product text gives 4 partial counties, 1 full one: * SEVERE THUNDERSTORM WARNING FOR... NORTHWESTERN APPANOOSE COUNTY IN SOUTH CENTRAL IOWA... NORTHEASTERN LUCAS COUNTY IN SOUTH CENTRAL IOWA... SOUTHWESTERN MARION COUNTY IN SOUTH CENTRAL IOWA... MONROE COUNTY IN SOUTH CENTRAL IOWA... SOUTHEASTERN WARREN COUNTY IN SOUTH CENTRAL IOWA.. Yet the official warning is actually for: LAT...LON
15 Quiz Question #1 How do you cancel a portion of the warning? Answer: Cancel one of the counties in the warning! IAC /O.CAN.KDMX.SV.W T0000Z T2345Z/...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN WARREN COUNTY IS CANCELLED... IAC /O.CON.KDMX.SV.W T0000Z T2345Z/...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHWESTERN MARION...MONROE...EASTERN LUCAS AND NORTHWESTERN APPANOOSE COUNTIES UNTIL 645 PM CDT...
16 Thankfully, we have TV Weather Comic Relief Lifted from Barons and WXC website. Those are county warnings!
17 Thankfully, we have social media Great job daryl on iembot!.. FAIL.
18 Quiz Question #2 What s wrong with this picture?
19
20
21 Percentage of Warnings 1 Oct Mar 2011: Number of Polygon Vertices (SVR+TOR) Number of Vertices
22
23 Average SBW Size [sq km] Average SBW Size Versus County Size per WFO (SVR+TOR shown, Alaska not included) Average County Size [sq km]
24
25
26 Lets get quantitative Perimeter Influence How much of the polygon perimeter coincides with a political boundary Areal Verification If the LSRs are buffered, what areal percentage verified Size Reduction How much smaller was the warning than the counties it was issued against.
27
28 ~ 2 % of all warnings
29 Nationwide is around 25%
30 Nationwide Average: 65%
31 Oh daryl, what about this? Warning County Perimeter ratio is small So lets compute another metric measuring distance of vertex to county border
32 Overall Average: 75%
33 What is broken? The warnings are constrained by political boundaries! NWS Office can t issue outside CWA Warning product (VTEC) is still bound to UGC codes Can t issue SVR/TOR over Marine Zones, why?!?! No penalty for warning size in verification Warning issuance software Warning dissemination software (bad daryl) Warning display software (bad daryl) Some local NWS Office policies conflict with NWS directives, where s the sheriff? No topology checks, invalid geometries are OK
34 Summary ~ 50% of TOR/SVR Warnings are 4 sided Only ~ 2 % of all SVR/TOR warnings are pure county retracements 75% of polygon vertices are guided by county borders SBWs have cut the size of warnings by over 50%, but the number of warnings has increased by 60%. The Cubs will not win the World Series this year
35 Is this the solution?
36 Equally, unrealistic solutions Warnings should be data, not products Computers are the most important readers UGC codes should not be included Warnings should come from NWS, not WFOs NWS should be working as a team, instead of theftdoms Polygons should be limited to 4 to 6 sides. The Cubs develop talent from their farm system and not overpay for free agents that struggle with the rigors of playing left field.
37 NWS Issues Products Forecaster tries to figure out what the public wants Disseminates Computer angry! Public doesn t call Congress. NWS Issues Data Computers deal with various users Disseminates Computer happy! Meathead happy!
38 Time for Questions? Daryl Herzmann
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